PS2601-M_技术文档

California Eastern Laboratories

Optocoupler

Applications

DESIGNING FOR OPTOCOUPLERS WITH BASE PIN

GENERAL

Optocouplers (optical couplers) are designed to isolate electrical output from input for complete elimination of noise. They have

been used conventionally as substitutes for relays and pulse transformers. Today's current technology in the area of microcom-

puters creates new applications for optocouplers.

This manual describes the characteristics of typical optocouplers. Also included are notes on designing application circuits for

typical optocouplers (with a base pin) for better comprehension. NEC's typical optocouplers with or without base pins are listed

on the following pages.

1

PS2600 Series Optocouplers (6-Pin Dual-in-Line Package)

Absolute Maximum Ratings

Electric Characteristics

(TA = 25°C)

Internal

connection

Product name

Features

BV

(Vr.m.s.)

IF (mA)

80

IC(mA)

50

CTR (%)

tr (µs)

(TYP)

PS2601

PS2601L

High isolation

voltage

High VCEO

(80 V MIN.)

Single transistor

*

5 k

80 to 600

3

5

PS2602

PS2602L

PS2603

PS2603L

High isolation

voltage

High CTR

Darlington-

transistor

80

200

200 to 2500 100

100

PS2604

PS2604L

PS2605

PS2605L

High isolation

voltage

A.C. input

±80

50

80 to 600

3

5

High VCEO

(80 V MIN.)

Single transistor

PS2606

PS2606L

PS2607

PS2607L

High isolation

voltage

*

A.C. input

High CTR

Darlington-

transistor

5 k

±80

200

200 to 3400

100

PS2608

PS2608L

PS2621

PS2621L

High isolation

voltage

Large input

current

*

5 k

150

50

20 to 50

3

5

PS2622

PS2622L

Single transistor

PS2625

PS2625L

High isolation

voltage

A.C. input

Large input

current

±150

PS2626

PS2626L

Single transistor

PS2633

PS2633L

High isolation

voltage

*

High VCEO

(300 V MIN.)

High CTR

Darlington-

transitor

1000 to

15000

5 k

80

150

50

100

PS2634

PS2634L

PS2651

PS2651L2

High isolation

voltage

High VCEO

(80 V MIN.)

Single transistor

*

50 to 400

3

5

PS2652

PS2652L2

PS2653

PS2653L2

High isolation

voltage

High CTR

Darlington-

transistors

200

200 to 3400

100

PS2654

PS2654L2

* (with a base pin)

Note: A product name followed by letter L indicates a product having leads formed for surface mount.

2

There are two kinds of optocouplers (a light emitting diode (LED) as an input and a phototransistor as an output) according to the

type of output transistor: Single transistor type and Darlington-transistor type.

The single-transistor type optocouplers are used to perform high-speed switching (with high-speed response). The Darlington-

transistor type optocouplers are used to obtain a large output current by utilizing a small input current (independently of switching

speeds).

Designing the circuits properly will improve the PS2601 optocoupler (Single Transistor type) by having a base pin in terms of

switching speed, elimination of noise in input signals, and output leakage current (collector dark current, and application to high-

voltage circuits).

APPLICATIONS OF OPTOCOUPLER BASE PINS

INCREASING SWITCHING SPEED

The switching speed of an optocoupler with a base pin can be increased by inserting a resistor between the base and the emitter

of its phototransistor even when the optocoupler is applied to a large load resistance.

Generally, the phototransistor of an optocoupler such as the PS2601 has a large photo-sensitive area on it. Accordingly, the

junction capacitance (CC-B) between the collector and the base of the phototransistor is great (up to 20 pF) and as a result its

response speed (turn-off time toff) is low. The relationship between turn-off time toff and collector-base capacitance CC-B is

expressed by:

toff × CC-B x hFE x RL ................(1)

where

toff : Turn-off time (See Fig. 2-2.)

CC-B : Collector-base capacitance

hFE : D.C. current amplification factor

RL : Load resistance

Cc-

B

RL

Figure 2-1. Collector-Base Capacitance

CC-B of Phototransistor

3

50%

Input

ton

toff

90%

Output

10%

Figure 2-2. ton/toff Measuring Points

As judged from expression (1), the turn-off time toff is affected by collector-base capacitance CC-B, D.C. current amplification

factor hFE, and load resistance LR. In actual circuit design, CC-B and hFE are fixed. Accordingly, the turn-off time is significantly

affected by the resistance of load RL.

Graph 1 shows the relationship between response speed (ton,toff) and load resistance (RL) in typical emitter follower (test circuit 1)

having a load resistance of 100 Ω.

PW = 100 µs

Duty = 1/10

(

)

VCC = 5 V

PS2601

IF = 5 mA

Input

monitor

Vo

Input

monitor

51 Ω

RL = 100 Ω

Vo

Test Circuit 1

Graph 1

Up

: Input 0.2 V/DIV

DOWN : Output 0.5 V/DIV

(50 µs/DIV)

4

Graph 2 shows the relationship between response speed (ton, toff) and load resistance (RL) in a typical emitter follower (Test

circuit 2) having a greater load resistance (5 kΩ).

VCC = 5 V

PS2601

IF = 5 mA

Input

monitor

Input

monitor

Vo

51 Ω

R

L

= 5 Ω

Test Circuit 2

Vo

Graph 2

Up

: Input 0.2 V/DIV

DOWN : Output 2 V/DIV

(50 µs/DIV)

As shown in Graph 2, the turn-off time for load resistance of 5 kΩ is about 100 µs. Similarly, the turn-off time for load resistance

of 100 kΩ is 1 to 2 ms. This is also true when the load resistance is connected to the collector of the phototransistor.

Graph 3 shows the relationship between response speed (ton, toff) and load resistance (RL) in a typical circuit (Test circuit 3)

having collector load resistance (5 kΩ) with the emitter grounded.

V

CC = 5 V

RL

= 5 Ω

PS2601

Vo

Input

monitor

IF = 5 mA

Input

monitor

Vo

51 Ω

Test Circuit 3

Graph 3

Up

: Input 0.2 V/DIV

DOWN : Output 2 V/DIV

(50 µs/DIV)

5

To reduce the turn-off time toff of a test circuit having a greater resistance, insert a resistor RBE between the emitter and the base

of the phototransistor. See Test circuit 4 and Test circuit 5. Graph 4 and 5 show their input and output waveforms.

V

CC = 5 V

PS2601

IF = 5 mA

Input

monitor

Vo

Input

monitor

51 Ω

RBE

RL

= 5 Ω

Insert resistor

of 200 kΩ here.

Vo

Test Circuit 4

(Emitter Follower)

Graph 4

Up : Input 0.2 V/DIV

DOWN : Output 2 V/DIV

(50 µs/DIV)

VCC = 5 V

RL

= 5 Ω

PS2601

Vo

Input

monitor

IF = 5 mA

Vo

Input

monitor

RBE

51 Ω

Insert resistor

of 200 kΩ here.

Graph 5

Up

Test Circuit 5

(Emitter Grounded)

: Input 0.2 V/DIV

DOWN : Output 2 V/DIV

(50 µs/DIV)

6

The turn-off time can be greatly reduced by the base-emitter resistance (RL). In Test circuit 4, the turn-off time of the test circuit

having resistance RL is about 1/30 of that of the test circuit without the resistance. This is because the carrier (photocurrent)

stored in the collector-base capacitor (CC-B) is quickly released through the base-emitter resistor (RBE). However, note that part

of a photocurrent generating on the base of the phototransistor flows through the RBE resistor and reduces the current transfer

ratio (CTR). Compare the voltage level of the output waveform in Photo 4 with that of the output waveform in Photo 2. The

current transfer ratio of the test circuit having a base-emitter resistor of 200 kΩ is half or less of that of the test circuit without the

resistance. (See 3.3 for reduction of the current transfer ratio CTR.)

For reference, Fig. 2-3 shows the switching-time vs. RL characteristics and Fig. 2-4 shows the switching-time vs. RBE characteris-

tics.

1000

Vcc = 5V

Vo

V

CC = 5V

I

F =

I

F =

x

I

x

I

5 mA

10

m

A

500

Vo

t f

51Ω

R

L

R L

t

f

51Ω

200

100

50

t s

IF= 10 mA Vcc = 5 V

IF = 5 mA VCC = 5 V

200

100

50

Sample Solid line:

t

s

Current transfer ratio of 166%

Dotted line:

Current transfer ratio of 274%

at Ir = 5mA

Current transfer ratio of 166%

Dotted line:

Current transfer ratio of 274%

at Ir = 5 mA

20

10

5

20

10

5

t

r

t r

t

d

2

1

2

1

t d

100

500

1 k

5 k 10 k

50 k 100 k

100

500

1 k

5 k 10 k

50 k 100 k

Load Resistance RL (Ω)

Fig. 2-3 Switching-Time vs. RL Characteristics

160

140

160

140

Vcc = 5 V, IF = 5mA

R1 = 5Ω

Solid line: Emitter follower

Dotted line: Emitter grounded

V

R

CC = 5 V, I

F = 10mA

L

= 5Ω

Solid line: Emitter follower

Dotted line: Emitter grounded

120

100

120

100

toff

80

60

40

80

60

40

ton

toff

20

0

20

0

100

200

500

1000

100

200

500

1000

Base-Emitter Resistance RBE (kΩ)

Fig. 2-4 Switching-Time vs. RBE Characteristics

7

STABILIZING OUTPUT LEVELS

When an optocoupler is used with the base pin of its phototransistor open, the collector dark current (ICEO) flows as a base

current. The current is amplified as a collector current and could make the output level of the phototransistor unstable. To

eliminate this unwanted base current and make the output level stable, flow the collector dark current (ICEO) through the base-

emitter resistor (RBE).

Fig 2-5 shows the ICEO vs. TA characteristics of a PS2601 optocoupler.

PS2601 ICEO-TA Characteristics

10000

I

F

= 0

V

CE = 80V (40V for the

PS2603) 2601

Solid line: PS2601

Dotted line: PS2603

1000

100

10

RBE =

RBE = 1MΩ

RBE =1MΩ

1

RBE =100 MΩ

0.1

- 20

0

20

40

60

80

100

Ambient Temperature TA (°C)

Figure 2-5. ICEO vs. TA Characteristics

ELIMINATION OF INDUCED NOISE

Generally, machine-controlling equipment generates induced noise which may cause malfunctions. This unwanted noise in input

signals can be isolated by means of optocouplers. However, if the noise is too strong, it may be switched to the output through

the input-output capacitance C1-2 of the optocoupler. This unwanted noise in the output can be removed in the following manner.

Insert a capacitor (preferably 100 pF) between the base and the emitter of the phototransistor of the optocoupler. This capacitor

delays response and suppresses malfunctions.

Graph 6-(a) to 6-(d) show how an external noise (surge voltage of 1000 V/µs at rise time) is eliminated as the capacitance of the

base-emitter capacitor.

A fluctuation in the collector-emitter voltage caused by the on/off operation of a power switch at the output of the optocoupler

causes a base current to flow through the collector-base capacitor (CCB), which causes a malfunction.

In Fig. 2-7, for example, an instantaneous base current flows through the collector-base capacitor (CCB) of the optocoupler. The

current is multiplied by hFE (as a collector current) and causes an output voltage on both ends of the load resistance. It seems as

if an input signal was applied to the optocoupler. Graph 7-(a) shows the waveforms. This unwanted instantaneous induction

current can be eliminated by inserting a capacitor CBE between the emitter and the base of the phototransistor. Graph 7-(b)

shows the waveforms. Fig. 2-8 shows the output-voltage vs. CBE characteristics.

Vo

CBE

RL

Figure 2-6.

Figure 2-7.

8

6a) CBE = No capacitance

6b) CBE = 10 pF

Vin

Vo

6c) CBE = 100 pF

6d) CBE = 1000 pF

Vin

Vo

Graph 6

Up

: Input Surge Voltage (Vin :1000 V/DIV)

DOWN : PS2601 output

(VO: 1 V/DIV)

C1-2

5 V

Vo

470 Ω

CBE

Vin

Test Circuit

9

Vin (dV/dt = 10 V/µs, 2 V/DIV)

CCB

Vin

Vo

Vo (0.1 V/DIV)

5 kΩ

(500 ns/DIV)

Graph 7-(a)

Input Voltage Fluctuation and Output

CCB

Vin (dV/dt = 10 V/µs, 2 V/DIV)

Vin

Vo

1000 pF

5 kΩ

Vo (0.1 V/DIV)

(500 ns/DIV)

Graph 7-(b)

Effect of Collector-Base Capacitance on

Voltage Fluctuation

10

PS2601

= 5 kΩ

R

L

1

0.1

0.01

100

1000

Base-Emitter Capacitance, CBE (pF)

Figure 2-8. Vo vs. CBE Characteristics

As mentioned above, noise induced by the fluctuation of supply voltage can be removed by proper treatment of the base pin. For

switching of input free from induced noise at normal switching speed, optocouplers with a base pin such as the PS2602 series

are available. If the base pin of an optocoupler is left unused or opened, it typically will pick up external noise. Cutting off the

base pin is also effective in order to prevent it from picking up external noise. See Graph 8-(b).

11

(PS2601)

Vin

Base pin

Vo

Graph 8-(a)

Up

: Input Surge Voltage (Vin: 1000 V/DIV)

DOWN : PS2601 Output

(Vo: 1 V/DIV)

Cut the base pin (pin 6)

(PS2601)

Vin

Vo

Graph 8-(b)

5 V

Vo

470 Ω

Vin

Test Circuit

12

ELIMINATION OF INPUT SURGES

Unwanted external noise and output leakage currents (e.g., collector current IC) of a preceding transistor may cause the light-

emitting diode (LED) of an optocoupler to light involuntarily. Usually, a circuit (connecting a resistor in parallel to the LED) is

provided to absorb such input surges. To prevent malfunction of an optocoupler, it is also effective to insert a resistor (RBE) that

increases the input threshold current (by the use of the input-output characteristics) between the base and the emitter of the

phototransistor. In this case, the current transfer ratio (CTR) must be low. (See 3.3 for Reduction of CTR.)

60

VCE = 5 V

(PS2601)

50

40

30

20

R

BE =

200 kΩ

100 kΩ

50 kΩ

20 kΩ

10 kΩ

30 kΩ

10

0

5 kΩ

1

2

3

4 5

10

20 30 40 50

Forward Current IF (mA)

Figure 2-9. IC vs. IF Characteristics (Example)

APPLICATION TO HIGH POTENTIAL CIRCUIT

The withstanding voltage between the collector and the emitter of the PS2601 optocoupler is 80 V (MAX). To make the

optocoupler available to higher withstanding voltages, use the collector-base junction photodiode as a light-sensitive element and

connect a high-voltage circuit to the output of the optocoupler. In this case, the output of the photodiode must be amplified

because it is smaller than the usual output.

Fig. 2-10 shows an example of an optocoupler applied to a high-voltage circuit. In this sample circuit, the photocurrent (ICBL) of

the optocoupler is fed to the base of the high-voltage transistor and a current (IF) passes forward through the light-emitting diode

(LED). Fig. 2-11 shows the ICBL vs. IF characteristics. Before working on applications outside the rated values of the

optocouplers, evaluate the practical circuits fully by contacting CEL.

200

VCB = 100V

(PS2601)

PS2601

100

100V

A

I

F

50

40

I

CBL

30

CTR = 274%

CTR = 166%

20

10

ICBL

5

4

3

2

Figure 2-10. Application to a

High Voltage Circuit

1

2

3

4 5

10

20 30 40 50

80

Figure 2-11. ICBL vs. IF Characteristic

13

NOTES ON USE OF OPTOCOUPLER BASE PIN

This chapter explains the reduction of a current transfer ratio of an optocoupler whose base and emitter are connected by a

resistor (RBE) and other optocouplers that seem to be significant in the treatment of the base pin of an optocoupler.

EQUIVALENT CIRCUIT (FOR PS2601 OPTOCOUPLER)

Fig. 3-1 shows an equivalent circuit of a single-transistor optocoupler such as the PS2601.

C1-2

A

K

C

CB

BE

RD

Cj

I

CBL

T

r

C

B

E

Figure 3-1. Equivalent Circuit (for PS2601 Optocoupler)

Cj

: Junction capacity of LED

CBE : Base-emitter capacitance

RD : Resistor serially connected to LED

ICBL : Collector-base photocurrent generated by the light of the LED

C1-2 : Input-output capacitance

Tr

: Amplifying transistor

DEFINITION OF CURRENT TRANSFER RATIO (CTR)

A current transfer ratio (CTR) of an optocoupler indicates the rate of an output current IC of its phototransistor to a forward input

current (IF) flowing through its light-emitting diode (LED). The CTR is expressed by:

IC

CTR =

x = 100 (%) ................(2)

IF

where IC = ICBL•hFE ..............................(3)

(hFE: D.C. current amplification factor of the phototransistor)

14

REDUCTION OF CURRENT TRANSFER RATIO (CTR) BY INSERTION OF BASE-

EMITTER RESISTOR

A resistor (RBE) connected to the base and emitter pins of an optocoupler causes the reduction of the output current (reduction of

current transfer ratio). This is because a part (I1) of the base current flows through the base-emitter resistor and causes a voltage

equivalent to the emitter-base voltage (VBE). The base current is reduced by this current component (I1) and, as the result, the

current transfer ratio (CTR) goes down. The output current IC' is expressed as follows:

I

CBL

I

CBL-

I

1

VBE

RBE

I

1

Figure 3-2.

VBE

RBE

IC' = hFE' (ICBL-I1) = hFE' ( ICBL-

VBE

)

•

_{• •}IC' = hFE' • ICBL ( 1 -

) ................ (4)

ICBL • RBE

Note IC'

hFE'

: Output current of an optocoupler having RBE

: Amplification factor of an optocoupler having RBE

Accordingly, the ratio of output current IC' (of the optocoupler having RBE) to output current IC (of the optocoupler with the base

open) is expressed by:

IC' hFE'

IC hFE

VBE

= ( 1 -

) ................ (5)

ICBL • RBE

As hFE' is equal to hFE if IF = approx. 5 mA, IC = approx. 15 mA, and RBC > 100 kΩ, expression (5) is simplified as follows:

IC'

IC

VBE

= 1 -

................ (6)

ICBL • RBE

15

Expression (6) indicates that the current transfer ratio (CTR) is significantly affected by the value of ICBL • RBE. For example, if

the forward current IF of the light-emitting diode is smaller (that is, ICBL is smaller) or if the base-emitter resistance RBE is smaller,

the reduction rate (rate of IC') becomes greater.

The above CTR reduction must be considered when inserting a resistor between the emitter and the base of the phototransistor

of the optocoupler to increase the switching speed. The performance of the optocoupler might become unstable because the

CTR will be affected by time elapse or temperature change (even if it is initially stable).

Fig. 3-3 shows the ∆CTR-RBE characteristics.

1.0

Normalized to 1.0

at RBE = ×

CTR = 274%

I

F = 1 mA, VCE = 5V

0.8

0.6

0.8

0.6

CTR =166%

CTR = 274%

0.4

0.2

0

0.4

0.2

0

CTR =166%

Normalized to 1.0

at RBE = ×

I

F

= 5 mA, VCE = 5V

100

200 300 400 500

1000

100

200 300 400 500

1000

Base Emitter Resistance RBE (kΩ)

1.0

CTR = 274%

CTR =166%

0.8

0.6

0.4

0.2

0

Normalized to 1.0

at RBE = ×

I

F

= 10 mA, VCE = 5V

100

200 300 400 500

1000

Base Emitter Resistance RBE (kΩ)

Figure 3-3. ∆CTR-RBE Characteristics

16

The reduction of a CTR is greatly affected by the positional relationship between load resistor RL and base-emitter resistor RBE,

as shown in Fig. 3-4 (b) and 3-4 (c).

Figure 3-4 (b).

Figure 3-4 (a).

Open

Figure 3-4 (c).

RBE Serial to RL

RBE Parallel to RL

I

CBL

ICBL

I

CBL

RBE1

RBE2

V

BE1

VBE2

VBE

Vo

V2

V

1

RL

The output voltage V0, V1, and V2 of the above circuits (a), (b), and (c) are related as follows:

V1

V2

VBE

=

^hFE1( 1 -

) ................ (7)

ICBL • RBE1

hFE0

VBE2

1 -

V2

V0

hFE2

hFE0

ICBL • RBE1

RL • hFE2

( )................ (8)

1 +

RBE2

When resistor RBE is serially connected to resistor RL (see Fig. 3-4 (c)), the reduction of a CTR becomes greater even if hFE2 is

approximately equal to hFE0 in expression (8) as the expression includes RL as a parameter.

Fig. 3-5 shows typical V0 vs. IF characteristics of the above circuits (a), (b), and (c).

10

Vcc = 10 V

RL = 470 Ω

Vcc = 10V

PS2601

(a) RB open

CTR = 190%

(PS2601)

I

F

8

6

(b) RBE = 100 kΩ

R

BE = 100 kΩ

Vo

4

2

0

RL

= 470 kΩ

(c) RBG = 100 kΩ

1

2

5

10

20

50

Forward current IF (mA)

Figure 3-5. Vo vs. IF Characteristics

17

CIRCUIT DESIGN EXAMPLE (USING THE PS2601)

Fig. 4-1 shows a design example of an optocoupler circuit having a base-emitter resistor for improvement of response ability.

Vcc = 5 V

PS2601

R2

= 510 Ω

TTL

IF = 5 mA

VOUT

I

4

I

0

1

R

0

1

= 1 kΩ

T

n1

A resistor of 510 kΩ

is inserted here.

I

3

R

I

b

= 2 kΩ

G

Figure 4-1. Circuit Design Example

The minimum current transfer ratio (CTR) required for TTL operation is calculated as follows:

Current I4 must be 1.6 mA to drive the TTL and the collector-emitter voltage of transistor Tr1 must be 0.8 V or less. Accordingly, I2

must be as follows:

VCC - VCE

R2

5 - 0.8

I2

=

= 8.2 (mA) ................(9)

0.51 (kΩ)

Therefore I3 = I2 + I4 = 8.2 + 1.6 = 9.8 (mA) ................(10)

Let's assume that hFE of transistor Tr1 is 40 (worst). Ib must be as follows:

I3

9.9 (mA)

40

Ib

=

= 0.247 (mA) ................(11)

hFE

Similarly, let's assume that VBE of transistor Tr1 is 0.8 V (worst), I1 must be as follows:

VBE

R1

0.8

I1 =

=

= 0.4 (mA) ................(12)

2 (kΩ)

Therefore, the output current I0 of the optocoupler is

I0 I1 + Ib = 0.647 (mA) ................ (13)

If forward current IF is 3 mA (worst) (normally IF = 5 mA), the CTR is calculated as follows:

I0

0.647(mA)

3 (mA)

CTR =

x 100 =

x 100 = 21.6% ................(14)

IF

18

Accordingly, the CTR value including reduction of CTR by time elapse, temperature change, and insertion of RBE must be 21.6 %

or more.

A design example of an optocoupler circuit that operates for at least ten years is shown below (using Fig. 3-3, 4-2 and 4-3). The

major causes of CTR reduction area as follows:

(From Fig. 3-3)

(From Fig. 4-2)

(From Fig. 4-3)

CTR-relative-value vs. RBE characteristics

15% down (with respect to initial value, RBE = ×)

CTR change with time (10 years, Ta = 60 °C)

40% down (with respect to initial value, 0 year)

CTR-relative-value vs. ambient-temperature characteristics

(Ta = 60 °C)

15% down (with respect to initial value ta = 25 °C)

Considering the above characteristics and safety factor = 2 (twice margin), the recommended CTR is:

21.6 x 1.4 x 1.15 x 1.15 x 2 = 80%.................(15)

(Reference)

1.2

1.0

0.8

0.6

1.2

1.0

0.8

0.6

0.4

0.2

0

I

T

F

= 5 mA

A = 25˚C

I

T

F

= 20 mA

= 25˚C

= 5 mA

= 60˚C

A

I

T

F

A

Normalized to CTR

test conditon

IF = 5 mA, VCE = 5V

0.4

0.2

0

2

3

4

5

0

10

Time (Hr)

10

Normalized to 100

at T = 25˚C

= 5 mA, VCE = 5 V

A

I

F

Figure 4-2. Change of CTR with

Time (PS2601)

-55 -40 -20

0

20

40

60 80

100

Ambient Temperature TA (°C)

Figure 4-3. CTR-Relative-Value vs.

TA Characteristics

19

PS2500-SERIES MULTI-CHANNEL OPTOCOUPLERS

GENERAL

Recently, optocouplers have been supplanting relays and pulse transformers for complete noise elimination, level conversion,

and high-potential isolation. Microprocessor systems are requiring more and more optocouplers on the limited area of PC boards

for I/O interface and other purposes. For these requirements, NEC has manufactured multi-channel optocouplers having 4 pins

(for one channel) to 16 pins (for four channels). These multi-channel optocouplers are called the PS2500 series optocouplers.

The PS2500 series optocouplers are divided into PS2501, PS2502, PS2505, and PS2506 according to their functions.

(PS2501L, PS2502L, PS2505L, and PS2506L have leads formed for surface installation.)

This manual describes features, structures, and basic characteristics of the PS2500 series optocouplers.

FEATURES, STRUCTURES, AND PACKAGE DIMENSIONS

Features

The major feature of PS2500 is very high isolation voltage between input and output (substantially two to three times that of the

conventional PS2400 series optocouplers). This can be proved because none of the 1300 test optocouplers were destroyed in a

strict product test (applying 10 kVac to each optocoupler for one minute). The improvement in dielectric strength of the PS2500

optocouplers has been accomplished by the double molding package structure.

In addition to high isolation voltage, the PS2500 optocouplers boast high heat resistance and high moisture resistance. Table 1

lists the major features of the PS2500 series optocouplers.

Features

Product

High isolation

Voltage

Abundant I/O functions

High CTR

(TYP)

High VCEO

(MIN)

Response

(TYP)

name

PS2501

PS2501L (*)

D.C. input, Single

transistor output

300%

80V

40V

80V

40V

tr = 3 µs

tr = 5 µs

PS2502

PS2502L (*)

D.C. input, Darlington

pair transistor output

2000%

300%

tr, tf = 100 µs

5 kVac

PS2505

PS2505L (*)

A.C. input, single

transistor output

tr = 3 µs

tr = 5 µs

PS2506

PS2506L (*)

A.C. input, Darlington

pair transistor output

2000%

tr, tf = 100 µs

Table 1. Features of PS2500 Optocouplers

Note: Tested in oil (In the air, unwanted arc discharging will occur at 6 to 7 kVac.)

* The product name followed by letter L is for a product having leads for surface mount.

20

Optocoupler Structure

Figure 1 shows the internal perspective view of a PS2500 optocoupler and Figure 2 shows the sectional view of the optocoupler.

Figure 2 below shows the optocoupler in a light-tight epoxy resin housing, and a light-sensitive element (phototransistor or photo

Darlington transistor) with light-transmittable epoxy resin medium between them. A light signal emitted by the LED is transferred

to the photosensitive transistor via the internal resin medium.

Both the housing resin and the internal resin have the same expansion coefficient. Namely, the optocoupler elements are molded

twice with epoxy resin. (This structure is referred to as a double molding structure.)

The high isolation voltage is obtained by the long adjacent area of the inner and outer resins (inner boundary) and identical

expansion coefficient of the inner and outer resins (eliminating arc discharges on the inner boundary).

Figure 1. Internal perspective view of optocoupler

Outer resin (Black)

Inner resin (White)

Inner boundary

Figure 2. Sectional view of optocoupler

21

Dimensions

Figures 3 and 4 show the dimensions of the PS2500 series optocouplers. The PS2500 series optocouplers are very compact

and fit for high-density installation on PC boards. For example, the package area occupied by a single channel of the PS2500

series is half that of the PS2600 series (6-pin Dual in-line package).

PS250X-1

PS250X-2

4 3

1 2

8 7 6 5

1 2 3 4

5.1 MAX

10.2 MAX

1,3. Anode

2,4. Cathode

5,7. Emitter

6,8. Collector

1. Anode

2. Cathode

3. Emitter

4. Collector

2.54

7.62

2.54

0.50±0.10

0.25

0.50±0.10

1.34

0.25 M

0 to 15˚

1.34

0 to 15˚

M

PS250X-4

16151413121110 9

1 2 3 4 5 6 7 8

20.3 MAX

1,3,5,7.

2,4,6,8.

Anode

Cathode

9,11,13,15. Emitter

10,12,14,16. Collector

2.54

7.62

0.50±0.10

0.25 M

1.34

0 to 15˚

Figure 3. Package Dimensions (Units in mm) (PS2501, PS2502, PS2505, and PS2506)

22

Lead Bending type (Gull-wing)

PS250XL-1

PS250XL-2

4

1

3

2

8

1

7

2

6

3

5

4

5.1 MAX

10.2 MAX

1. Anode

1,3. Anode

2. Cathode

3. Emitter

4. Collector

2,4. Cathode

5,7. Emitter

6,8. Collector

7.62

6.5

2.54

6.5

2.54

0.9±0.25

9.60±0.4

0.9±0.25

1.34±0.10

0.25

M

0.25

M

PS250XL-4

16 15 14 13 12 11 10 9

20.3 MAX

1

2 3 4 5 6 7 8

1,3,5,7.

2,4,6,8.

Anode

Cathode

9,11,13,15. Emitter

10,12,14,16. Collector

7.62

6.5

2.54

9.60±0.4

0.9±0.25

1.34±0.10

0.25

M

Fig. 4 Package Dimensions (Units in mm) (PS2501L, PS2502L, PS2505L, and PS2506L)

23

CHARACTERISTICS OF PS2501 AND PS2505 OPTOCOUPLERS

Current Transfer Ratio (CTR)

The current transfer ratio (CTR) of an optocoupler is the ratio of the value of output current IC to the value of input forward current

IF (IC/IF x 100%). The CTR is a parameter equivalent to the D.C. current amplification factor hFE of a transistor.

The CTR is one of the most significant characteristics of optocouplers, as well as isolation voltage. In circuit designing, CTR must

be considered first of all because the CTR:

1

2

3

varies as time goes by,

is affected by ambient temperature, and

is dependent upon forward current IF flowing through the LED.

Both PS2505 and PS2506 optocouplers (bidirectional input type) have two current transfer ratios (CTRs) because they have two

LEDs in the input. For further information, refer to Applications of Optocouplers for A.C. input.

Change of CTR over time

The current transfer ratio (CTR) of an optocoupler is determined by the light-emission efficiency of the LED (emitting infrared

light), efficiency of light transmission between the LED and the phototransistor, light sensitivity of the phototransistor, and hFE of

the transistor.

The change of a CTR over time is mainly caused by reduction of the light-emission efficiency of the LED. Generally, the CTR is

reduced to a greater extent as the forward current IF increases or as the operating temperature increases. Figure 5 and 6

respectively show estimated changes of CTRs of PS2501 and PS2505 optocouplers over time.

Estimated change of CTRs with time lapse (Standard values)

1.2

Standard value

Standard characteristics

F = 5 mA

Continuous supply of 20 mA (IF)

1.0

0.8

0.6

0.4

0.2

I

0.8

0.6

T

A

= 60˚C

I

F = 20 mA

T

A

= 25˚C

I

F

= 5 mA

T

A

= 60˚C T

A

= 25˚C

TA = 25˚C

0.4

0.2

0

2

3

4

5

6

2

3

4

5

10

0

10

Time (Hr)

Figure 5.

Figure 6.

CTR vs. TA Characteristics (TA: Ambient Temperature)

The CTR-Temperature characteristic is greatly affected by the total characteristics of light-emission efficiency of the LED and hFE

of the phototransistor as the light-emission efficiency has a negative temperature coefficient and hFE has a positive temperature

coefficient. See Figure 7.

TA

Figure 7. CTR vs. TA Characteristics

24

Figure 8-(a) to Figure 8-(g) show CTR vs. TA characteristics under various conditions.

(b)

1.50

(a)

1.2

1.0

Standard characteristics

= 5 mA, VCE = 5V

Standard characteristics

= 1 mA, VCE = 5V

I

F

I

F

1.25

1.00

0.75

0.50

0.25

0

0.8

0.6

0.4

0.2

0

Normalized to

1.0 at T = 25˚C

1.0 at T

A

= 25˚C

A

-50

-25

0

25

50

75

100

-50

-25

0

25

50

75

100

Ambient Temperature TA (°C)

(d)

(c)

1.6

1.2

1.0

Standard characteristics

CTR = approx. 200%

1.50

Standard characteristics

IF = 0.3 mA, VCE = 5V

1.25

1.00

0.75

0.8

0.6

0.4

0.50

0.25

Normalized to

1.0 at T = 25˚C

0.2

0

1.0 at TA = 25*C

A

I

F

= 5 mA,VCE = 5V

0

-50

-25

0

25

50

75

100

-50

-25

0

25

50

75

100

Ambient Temperature TA (°C)

(e)

(f)

1.2

1.0

0.8

Standard characteristics

CTR = approx. 400%

Standard characteristics

CTR = approx. 300%

1.0

0.8

0.6

0.4

0.2

0

0.6

0.4

Normalized to

1.0 at TA = 25˚C

0.2

0

1.0 at TA = 25˚C

I

F

= 5 mA, VCE = 5V

I

F

= 5 mA,VCE = 5V

-50

-25

0

25

50

75

100

-50

-25

0

25

50

75

100

Ambient Temperature TA (°C)

(g)

1.2

1.0

Standard charcteristics

CTR = approx. 500%

0.8

0.6

0.4

0.2

0

Normalized to

1.0 at T

A = 25˚C

I

F

= 5 mA, VCE = 5V

-50

-25

0

25

50

75

100

Ambient Temperature TA (°C)

25

CTR vs. IF Characteristics (IF: Forward Current Flowing Through the LED)

The current transfer ratio (CTR) depends upon the magnitude of a forward current (IF). When IF goes lower or higher than a

proper magnitude, the CTR becomes smaller. Figure 9 shows the CTR vs. IF characteristics.

Note that rate changes of CTRs are very diffrent at low IF magnitude (approx. 5 mA), middle IF magnitude (approx. 5 mA), and

high IF magnitude (approx. 20 mA). Namely, the CTR depends heavily upon the magnitude of forward current IF in lower and

higher current ranges.

For low-input and high-output switching, see Chapter 4.

600

Standard characteristics

VCE = 5V

500

400

300

Sample A

Sample B

200

100

0

0.1

0.5

1

5

10

50

Forward Current IF (mA)

Figure 9. CTR vs. IF Characteristics (Standard Value)

Response Characteristics

The response characteristics of optocouplers are the same as those phototransistors. The fall time tf is expressed by:

tf RL•hFE•CCB

RL: Load resistance

hFE: Amplification factor

CCB: Collector-base capacitance

If RL is too high, tf becomes too high to be fit for high-speed signal transmission. Select the proper load resistance for the desired

signal rate. Similarly, the collector current must fully satisfy the minimum value of the CTR, CTR vs. TA characteristics, and CTR

vs. time characteristics. Otherwise, the phototransistor will operate unsaturated, causing lower response characteristics and

malfunction.

Figures 10 to 13 show the response-time vs. forward current characteristics and response-time vs. VCC characteristics, using load

resistance and ambient temperature as parameters.

26

1000

500

1000

500

Standard characteristics

V

R

CC = 5 V

T

A

= 25˚C

V

R

CC = 5 V

TA

= 25˚C

L

= 10 kΩ

TA = 85˚C

L

= 4.7 kΩ

TA = 85˚C

200

100

50

200

100

50

t

off

t

off

t

s

t

s

20

10

20

10

t

on

t

on

5

t

d

t

d

2

1

2

1

0

5

10

0

5

10

Forward Current IF (mA)

Figure 11. Response-Time vs. IF

Characteristics

Figure 10. Response-Time vs. IF

Characteristics

1000

500

1000

500

Standard characteristics

I

F

= 10 mA

T

A

= 25˚C

IF = 10 mA

TA = 25˚C

TA = 85˚C

RL

= 10 kΩ

TA = 85˚C

RL = 3 kΩ

t

off

200

100

50

200

100

50

toff

t

s

20

10

20

10

ts

ton

t

on

5

td

t

d

2

1

2

1

0

5

10

0

5

10

VCC (V)

Figure 13. Response-Time vs. VCC

Characteristics

Figure 12. Response-Time vs. VCC

Characteristics

For reference, a voltage-gain vs. frequency characteristic using CTR as a parameter is shown below.

27

5

0

Standard

characteristics

Test Circuit and Condition

-5

-10

-15

-20

-25

V

CC = 10 V

1 kΩ

51 Ω

330 µF

I

C

= 2.25 mA

CTR = 156%

V O

CTR = 186%

CTR = 304%

1 kΩ

100

500 1 k

5 k 10 k

50 k 100 k 500 k

Frequency f (HZ)

Figure 14. Voltage-Gain vs. Frequency Characteristics

(Standard Value) (PS2501, PS2505).

Other Temperature Characteristics

Almost all characteristics of optocouplers are apt to be affected by ambient temperature (see 3.1.2). Figures 15 to 21 show how

VF (Forward Voltage), ICEO (Collector Cut-Off Current), and VCE (sat) (Collector Saturation Voltage) are affected by ambient

temperature.

1.2

1.1

1.0

I

F

= 1 mA

0.9

0.8

0.7

0.6

0.5

-30

0

25

50

75

100

Ambient Temperature TA (°C)

Figure 15. VF vs. TA Characteristics

28

10000

5000

10000

5000

Standard characteristics

CTR = approx. 400%

Standard characteristics

CTR = approx. 100%

(1 µA)

1000

500

V

CE = 80 V

40 V

(1 µA)

1000

500

V

CE = 80 V

40 V

24 V

10 V

5 V

24 V

10 V

5 V

100

50

100

50

10

5

10

5

1

0.5

0.1

-50

0.1

-50

-25

0

25

50

75

100

-25

0

25

50

75

100

Ambient Temperature TA (°C)

Figure 17. ICEO vs. TA Characteristics

Figure 16. ICEO vs. TA Characteristics

0.3

0.2

0.3

0.2

CTR = approx. 200%

CTR = approx. 400%

0.1

I

F

= 1 mA

I

F

= 5 mA

= 4 mA

C

0

-50

-25

0

25

50

75

100

-50

-25

0

25

50

75

100

Ambient Temperature TA (°C)

Figure 18. VCE (sat) vs. TA Characteristics

Figure 19. VCE (sat) vs. TA Characteristics

0.20

0.15

18

IF = 10 mA, TA = 25˚C

I

F

= 8 mA,

15

T

A = 25˚C

CTR = 400%

330%

10

200%

IF = 10 mA,

T

A

= 85˚C

IF = 8 mA,TA = 85˚C

0.10

0.05

5

0

Standard

characteristics

CTR = 200%

I

F

= 5 mA

= 1 mA

C

0.5

1.0

1.5

2.0

-50

-25

0

25

50

75

100

Collector Saturation Voltage VCE (sat) (V)

Ambient Temperature TA (°C)

Figure 20. VCE (sat) vs. TA Characteristics

Figure 21. IC vs. VCE (sat) Characteristics

29

At normal temperature (TA = 25 °C), the collector cut-off current ICEO is very little (about 1 nA (at VCE = 80 V and CTR = about

400% )), but it will be multiplied by about 10 at an increment of 25°C. This needs to be kept in mind when using a small output

current (IC) of an optocoupler with a high load.

The rate change of VCE (sat) (Collector Saturation Voltage) is about 0.7% per °C at ambient temperature of 0°C to 70°C. In circuit

design, the collector output current IC should be determined under the condition of half or less of the CTR rated values. Other-

wise, the saturation voltage VCE (sat) will become greater.

CHARACTERISTICS OF PS2502 AND PS2506 OPTOCOUPLERS

The PS2502 and PS2506 optocouplers are higher in sensitivity than the PS2501 and PS2505 optocouplers and can be driven by

low currents.

CTR-Related Characteristics

The PS2502 and PS2506 optocouplers assure CTR 200% at IF = 1 mA and can be directly driven by CMOS output signals.

See 3.1 for CTR definition and characteristics.

Change of CTR Over time

Figure 22 shows the CTR vs. time characteristics of the PS2502 and PS2506 optocouplers.

1.2

Standard values Continuous supply of

IF = 1 mA

1.0

0.8

0.6

0.4

TA = 25˚C

T

A

= 60˚C

0.2

0

2

3

4

5

10

Time (Hr)

Figure 22. CTR vs. Time Characteristics (Standard Value)

30

CTR vs. Temperature Characteristics

Figure 23-(a) to 23-(f) show CTR vs. Temperature Characteristics under various conditions.

23-(b)

23-(a)

1.4

1.2

1.4

1.2

Standard characteristics

1.0

0.8

0.6

0.4

0.2

0

1.0

0.8

0.6

0.4

0.2

0

Normalized to

1.0 at T = 25˚C

= 1 mA, VCE = 2V

Normalized to

1.0 at T = 25˚C

= 0.3 mA, VCE = 2V

A

I

F

I

F

-50

-25

0

25

50

75

100

-50

-25

Ambient Temperature TA (°C)

23-(d)

0

25

50

75

100

Ambient Temperature TA (°C)

23-(c)

1.4

1.2

1.4

Standard characteristics

CTR = approx. 2500%

Standard characteristics

1.2

1.0

0.8

0.6

0.4

0.2

0

1.0

0.8

0.6

0.4

0.2

0

Normalized to

1.0 at T = 25˚C

= 0.1 mA, VCE = 2V

Normalized to

A

1.0 at TA = 25˚C

I

F

I

F

= 1 mA, VCE = 2V

-50

-25

0

25

50

75

100

-50

-25

0

25

50

75

100

Ambient Temperature TA (°C)

23-(e)

23-(f)

1.4

1.2

1.4

1.2

Standard characteristics

CTR = approx. 3500%

Standard characteristics

CTR = approx. 4500%

1.0

0.8

0.6

0.4

0.2

0

1.0

0.8

0.6

0.4

0.2

0

Normalized to

1.0 at T

A = 25˚C

1.0 at T

A = 25˚C

I

F

= 1 mA, VCE = 2V

I

F

= 1 mA, VCE = 2V

-50

-25

0

25

50

75

100

31

-50

-25

0

25

50

75

100

Ambient Temperature TA (°C)

CTR vs. IF Characteristics

As shown in Figure 8, the CTR of a single-transistor output optocoupler (such as the PS2501 and PS2505 optocouplers) is at

most 20% in a low-current area (e.g. IF = 0.1 mA). However, the CTR of a Darlington-transistor output optocoupler (such as the

PS2502 and PS2506 optocouplers) can be greater than 200% in a low-current area (e.g. IF = 0.1 mA).

Figure 24 shows the CTR vs. IF characteristics of the PS2502 and PS2506 optocouplers.

7000

Standard characteristics

V

CE = 2V

6000

5000

4000

3000

2000

1000

0

0.05 0.1

0.5

1

5

10

50

Forward Current IF (mA)

Figure 24. CTR vs. IF Characteristics (Standard Value)

(PS2502, PS2506)

CONCLUSION

Demand for optocouplers featuring higher insulation and noise elimination is steadily increasing. At the same time, various

problems (change of characteristics by ambient temperature and time elapse) will occur in their circuit design. We hope this

manual will be helpful in solving such problems.

32

APPLICATION OF AC INPUT COMPATIBLE OPTOCOUPLER

INTRODUCTION

With the rapid penetration and diversification of electronic systems, demand for optocouplers is strengthening. Most popular are

products featuring compact design, low cost, and high added value.

To meet the market needs, NEC is expanding the optocoupler. This manual focuses on optocouplers compatible with AC input,

and covers configuration, principles of operation, and application examples.

CONFIGURATION (INTERNAL PIN CONNECTION DIAGRAM)

(LED2) (LED1)

1

2

4

3

1

4

3

2

Figure 1. PS2505-1

Figure 2. PS2501-1

Figure 1 shows the internal pin connection of the AC input compatible optocoupler PS2505-1, and Figure 2, of the optocoupler

PS2501-1. The most significant difference from the optocoupler (PS2501-1) is that the PS2505-1 incorporates an input circuit

with two LEDs connected in reverse parallel. In the optocoupler (PS2501-1), one LED is connected in the input circuit so that the

LED emits light to provide a signal when a current flows in one direction (1-2 in Figure 2) (one-direction input type).

However, in the configuration shown in Figure 1, when a current flows in direction 1 to 2, LED1 emits light to send a signal, and

when it flows from 2 to 1, LED2 emits light to send a signal (bidirectional input type). Namely, even if the voltage level between 1

and 2 varies, and the positive and negative polarities are changed, either of two LEDs emits light to send a signal. This means

that the one direction input optocoupler permits DC input only, while the bidirectional input type permits AC input as well. There-

fore, the PS2505-1 is described as an AC input compatible optocoupler.

The next section describes the status of output signals when 100 Vac power is directly input to an AC input compatible

optocoupler (PS2505-1) via a current limit resistor.

33

DIRECT INPUT OF 100 Vac

Figure 3 shows the circuit diagram when 100 Vac power is directly input to an AC input compatible optocoupler via a current limit

resistor. The relationship between input and output signals is as shown in Figure 4.

(LED2) (LED1)

V

CC = 10 V

AC 100 V

Output signal

100 Ω

11 kΩ

PS2505-1

Figure 3. 100 Vac Direct Input Circuit

+

Input signal

AC 100 V

0

_

LED light

emission

output

Deviation due to

the differences in

light emission and

coupling efficiencies

of LEDs

LED 1

LED 2

+

0

Output signal

Figure 4. Input/Output Signal

Graph 1 Upper: 100 Vac Input Signal 100 V/DIV

Lower: Output Signal 1 V/DIV

As described above, when an AC input compatible optocoupler is used, an AC input signal can be extracted as a full-wave

rectified output signal. The output signal is smoothed by inserting a capacitor in the last stage of the circuit of a phototransistor if

necessary.

In the one-direction input optocoupler (PS2501 series), when an AC signal is to be input, it must be full-or half-wave rectified by a

diode bridge or CR circuit. On the other hand, the AC input compatible optocoupler permits direct input of an AC signal. This

enables simpler configuration, space saving, and reduced design cost.

The next section demonstrates three examples of applications.

34

APPLICATION EXAMPLES

Example 1: AC-DC converter

VCC

V

CC

AC 100 V

AC 100V

PS2505-1

PS2501-1

+

0

+

0

+

0

_

(a) AC input compatible optocoupler

(bidirectional input)

(b) Conventional optocoupler

(one-direction input)

(Full-wave rectification by means of

diode bridge)

Example 2: Detection of a telephone bell signal

Station line

(75 Vr.m.s., 16 HZ)

Station line

(75 Vr.m.s., 16 H

PS2505-1

Z

)

PS2501-1

+

0

_

+

0

_

0

_

(a) AC input compatible optocoupler

(bidirectional input)

(b) Conventional optocoupler

(one-direction input)

(rectification by CR circuit)

35

Example 3: Sequencer circuit input section

Common

PS2501-2

AC 100V

AC 100 V

PS2505-2

(a) AC input compatible optocoupler

(bidirectional input)

(b) Conventional optocoupler

(one-direction input)

(Full-wave rectified by diode bridge)

PRECAUTIONS FOR DESIGN

The AC input compatible optocoupler is identical to the conventional optocoupler except for the presence of two LEDs connected

in reverse parallel in the input circuit. Therefore, the circuit configuration can be designed as conventionally. The difference is

that there are two types of current transfer ratios (CRT) because two LEDs are connected in the input circuit. The two CTRs are

not necessarily the same, owing to the differences in light emission and coupling efficiencies of LEDs. Consequently, this causes

deviation in output signal level. The differences are rated under the item of the current efficiency ratio (CTR1/CTR2) for electric

characteristics.

Current transfer ratio (CTR1/CTR2)

IC1

CTR1 =

IF1 x (current flowing in LED1)

IC2

I

F1

IC1

A

CTR2 =

V

CE = 5 V

IF2 x (current flowing in LED2)

I

C2

A

F2

LED 2 LED 1

Figure 5. CTR Measuring Circuit

36

The transfer efficiency ratio (CTR1/CTR2) is rated as 0.3 (MIN.), 1.0 (TYP.), and 3.0 (MAX.). Assuming that CTR1 is 200%, CTR2

is in the range of 66 to 600%. Therefore, an AC input compatible optocoupler should be designed to operate with CTR 66 to

600%. For reference, the electric characteristics of the AC input compatible optocoupler (PS2505 series) are as follows:

Electric Characteristics (TA = 25°C)

ITEM

CODE

VF

CONDITIONS

IF = ±10 mA

MIN.

TYP.

1.1

MAX.

1.4

UNIT

Forward voltage

V

Diode

Pin-to-pin capacitance

Collector cutoff current

Current transfer ratio

Ct

V = 0, f = 1.0 MHZ

VCE = 80 V, IF = 0

50

pF

nA

%

Transistor

ICEO

100

600

CTR(IC/IF)

IF = ± 5 mA

80

300

VCE = 5.0 V

Collector saturation voltage

VCE(sat)

IF = ±10 mA

0.3

V

IC = 2.0 mA

11

Insulation resistance

R1-2

C1-2

Vin-out = 1.0 kV

10

Ω

Input-to-output capacitance

V = 0, f = 1.0 MHZ

0.5

3

pF

Coupled

VCC = 10 V,

IC = 2 mA,

RL = 100Ω

Rise time

tr

tf

µs

VCC = 10 V,

IC = 2 mA,

RL = 100Ω

Fall time

5

IF = 5 mA,

Transfer efficiency ratio

CTR1/CTR2 VCE = 5.0 V

0.3

1.0

3.0

For the external drawing, absolute maximum ratings, and characteristics curves, refer to the specific documents (AC input

compatible multi-optocoupler series).

EXCLUSIVE NORTH AMERICAN AGENT FOR

RF, MICROWAVE & OPTOELECTRONIC SEMICONDUCTORS

CALIFORNIA EASTERN LABORATORIES • Headquarters • 4590 Patrick Henry Drive • Santa Clara, CA 95054-1817 • (408) 988-3500 • Telex 34-6393 • FAX (408) 988-0279

24-Hour Fax-On-Demand: 800-390-3232 (U.S. and Canada only) • Internet: http://WWW.CEL.COM

07/17/2000

DATA SUBJECT TO CHANGE WITHOUT NOTICE

37


型号：	PS2601-M
厂家：	NEC
描述：	暂无描述光电输出元件
文件：	总38页 (文件大小：223K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

PS2601-M [NEC]

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