PCF2470OHMK [KOA]
Fixed Resistor, 2W, 470ohm, 400V, 10% +/-Tol, Through Hole Mount, AXIAL LEADED;
| 型号： | PCF2470OHMK |
| 厂家： | 
KOA SPEER ELECTRONICS, INC. |
| 描述： | Fixed Resistor, 2W, 470ohm, 400V, 10% +/-Tol, Through Hole Mount, AXIAL LEADED PC 电阻器 |
| 文件： | 总8页 (文件大小：71K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
KOA SPEER ELECTRONICS, INC.
SS-02 R3
Fixed Ceramic Composition Resistors
Type PCF
1. Scope of Application
This specification relates to non-flammable coated, insulated type, fixed
ceramic resistors (type PCF) manufactured by KOA T&T Corporation.
2. Rating
Table 1
Item
Power Rating
1/4
1/2
1
2
Resistance range (Ω)
4.7 ~ 100K
3.3 ~ 1M
Max. working voltage (V)
Max. overload voltage (V)
Max. pulse voltage (KV)
Withstanding voltage (V)
Min. ambient temp. (°C)
Max. ambient temp. (°C)
Rated ambient temp. (°C)
150
300
8
200
400
10
300
600
14
400
800
20
400
500
-40
200
70
700
K( 10ꢀ), M( 20ꢀ)
as per E12
as per E6
Resistance tolerance
K( 10ꢀ)
M( 20ꢀ)
3. Type Designation
PCF
1/2
10k Ω
K
Type
Power Rating
Nominal Resistance
Resistance Tolerance
Non-flammable coated,
insulated type,
fixed ceramic
composition resistors
1/4
1/2
1
1/4----4.7 ~ 100K
1/2----4.7 ~ 100K
1----3.3 ~ 1M
K: 10ꢀ
M: 20ꢀ
2
2----3.3 ~ 1M
3.1 Marking
The resistors shall be marked with color codes as per EIA-172.
PAGE 1 OF 8
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Bolivar Drive
P.O. Box 547
Bradford, PA 16701
USA
814-362-5536
Fax 814-362-8883
www.koaspeer.com
KOA SPEER ELECTRONICS, INC.
SS-02 R3
3.2 Derating Curve
Under ambient temperature in excess of 70°C, the
load shall be derated as shown in the figure below.
100
80
60
40
20
0
-40
0
70 100
200
Ambient Temperature (°C)
3.3 Rated Voltage
Resistors shall have a rated direct current
(DC) continuous working voltage or an
approximate sine wave rootmean square
(rms) alternation-current (AC) continuous
working voltage at commercial line frequency
and wave form corresponding to the power
rating, as determined from the following
formula:
In no case shall the rated DC or rms AC
continuous working voltage be greater than
the applicable maximum value.
Where, E =
√
P x R
E = Rated DC or rms AC
continuous working voltage (V)
P = Power rating (W)
R = Nominal resistance (OHM)
PAGE 2 OF 8
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Bolivar Drive
P.O. Box 547
Bradford, PA 16701
USA
814-362-5536
Fax 814-362-8883
www.koaspeer.com
KOA SPEER ELECTRONICS, INC.
SS-02 R3
4. Structure and Dimension
4
1
2
3
d (nominal)
H
L
H
D
C
unit: mm
Type Designation
D
L
C max.
7.1
H
d
PCF1/4
PCF1/2
PCF1
2.5 0.5
3.5 0.5
5.5 1.0
7.0 1.0
6.2 0.5
9.0 1.0
0.6
30
38
3
3
11.1
19.0
22.5
0.7
16.5 1.0
19.0 1.0
0.8
PCF2
Maximum allowable uncoated area of resistor end surface.
Type Designation
1/4
1/2
1
2
Allowable uncoated area
of resistor end surface
1.0
1.5
2.2
2.9
D
unit: mm
No. Name
Material
Remarks
1
2
Resistor
Ceramic composition
Ceramics
The edge of resistor Silver
Cap surface treatment:
First plated with copper, then tin
cap: Iron
3
4
Terminal
Coating
Terminal wire surface treatment:
Plated with solder
Connection of cap to terminal wire: Weld
Terminal wire:
Annealed copper wire
Non-inflammable insulating silicone coating material color:
Light Green UL-94 V-0 approved material
PAGE 3 OF 8
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Bolivar Drive
P.O. Box 547
Bradford, PA 16701
USA
814-362-5536
Fax 814-362-8883
www.koaspeer.com
KOA SPEER ELECTRONICS, INC.
SS-02 R3
5. Characteristics
Requirement
No.
Characteristics
Test Method
(MIL-STD 202)
1
Resistance
(Method 303)
Resistance to the
nominal resistance
should be in each
resistance tolerance
shown below.
In the event of a difference in resistance readings
attributable to the test voltage used, the specified
test voltage listed below shall be used.
Nominal Resistance
Range
Recommended Test
Voltages (DC Volts)
Resistance
Tolerance
3.3 to 9.1 ohms
10 to 91 ohms
100 to 910 ohms
1k to 9.1k ohms
10k to 91k ohms
100k to 1M ohms
0.3
1.0
3.0
3.0
3.0
3.0
K
M
10ꢀ
20ꢀ
2
Temperature
Coefficient
(Method 304)
-1300 300ppm/°C
Resistors shall be maintained within 1°C at the
ambient temperatures listed below. The use of
forced circulating air is recommended to assure
temperature stability and uniformity. Resistance
measurements shall be made at each temperature
15 minutes after air temperature has stabilized at
the specified temperature.
The percent difference in resistance referred
to the resistance at +25°C shall be computed with
the following formula:
Percent Resistance = (R-r) x 100
Difference
r
Where: R is the resistance at test temperature
r is the resistance at +25°C
Sequence
Ambient Temperature
1
2
3
4
5
+25°C
-40°C
+25°C
+75°C
+125°C
PAGE 4 OF 8
www.koaspeer.com
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Bolivar Drive
P.O. Box 547
Bradford, PA 16701
USA
814-362-5536
Fax 814-362-8883
KOA SPEER ELECTRONICS, INC.
SS-02 R3
3
Voltage Coefficient
from 1k ohms ~
(Method 309)
0 ~ -0.2ꢀ/V
The resistance shall be measured at one-tenth the
RCWV and at full RCWV. Application of voltages
shall be momentary to minimize heating effects.
The resistance - voltage coefficient shall be
calculated with the following formula:
Voltage Coefficient =
Percent Per Volt
(R-r) x 100
r x 0.9 (RCWV)
Where: R is the resistance at full RCWV
r is the resistance at one-tenth RCWV
4
5
Short Time Overload
Within
(2ꢀ + 0.05 ohm)
A well regulated DC or sine wave RMS voltage
2.5 times the RCWV, but not exceeding the limit
values listed in Table 1, shall be applied for 5
seconds. Resistance shall be measured before
and approximately 30 minutes after the application
of the test voltage.
Terminal Strength
(Method 211)
Resistance change shall
be (1ꢀ + 0.05 ohm) of
the Pre-test value, with
no terminal loosening,
and lead-wire break-
down developing.
Lead wire (D) (mm)
Ø 0.6, 0.7 Ø 0.8
Test
Method
Test Item
Tensile
10N
20N
30 5 sec
Strength (1.02kgf)
(2.04kgf)
0.51kgf
–––––––
––––––– 5N (0.5kgf)
1.02kgf 10N (1.02kgf)
Bending
Strength
6
Vibration
(Method 201)
Resistance change shall
be (2ꢀ + 0.05 ohm) of
the Pre-test value, with
no terminal loosening
and lead-wire break-
down developing.
Initial resistance shall be measured. The frequency
shall be varied approximately logarithmically
between the nominal limits of 10 to 55 Hertz with
a return sweep to 10 Hertz shall be traversed in
approximately 1 minute. This sweep cycle shall
be performed repeatedly for 2 hours in each three
directions to perpendicular. Final measurements
and examination for mechanical failures shall be
made after the test.
PAGE 5 OF 8
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Bolivar Drive
P.O. Box 547
Bradford, PA 16701
USA
814-362-5536
Fax 814-362-8883
www.koaspeer.com
KOA SPEER ELECTRONICS, INC.
SS-02 R3
7
8
9
Resistance to
soldering heat
(Method 210)
Resistance change shall
be (2ꢀ + 0.05 ohm)
of the Pre-test value with
no mechanical damage
in appearance and
marking.
Initial resistance shall be measured. Resistor leads
shall then be immersed, one at a time for 3.5 0.5
sec. each, in molten solder at +350°C 10°C to a
distance of 2 - 2.5mm from the resistor body. Final
resistance shall be measured 2 1 hr. after the
immersions.
Solderability
(Method 208)
Over 3/4th of the lead-
wire surface area shall
be covered with solder,
when judged visually.
The lead-wire is immersed for 2 - 3 seconds
in methanol solution containing rosin body is
immersed in melted solder at temperature of
235 5°C for a period of 3 0.5 sec. as far as
the point 2 - 2.5mm from the resistor body.
Resistance
to solvents
No evidence of
mechanical damage
in appearance and
marking.
1. Sample shall be immersed in ultrasonic
solvents of 28kHz frequency, 150w (0.3w/cm2)
power at 35 5°C for 2 minutes.
2. After samples shall be immersed in specified
solvents (following table) for 3 minutes, the resistor
shall be immediately wiped with a dry cloth
(velvet or gauze)
(Solvents)
1. Iso-proryle alcohol
2. 1-1-1 trichloroethane
10
Dielectric
withstanding voltage
(Method 301)
The resistor develops
no dielectric breakdown.
Resistance change shall
be (1ꢀ + 0.05 ohm)
of the Pre-test value.
The resistors shall be clamped in the trough of a
90°C metallic V-block of such size that the resistor
body does not extend beyond the ends of the
trough. The resistor leads shall be positioned such
that they are no closer to the V-block than if they
were parallel to the sides of the V-block. This
prevents unnecessary proximity of the leads to
the block, while permitting complete seating of
the resistor body in the block.
Sine wave RMS voltages from an alternating
current supply at commercial line frequency not
more than 100 Hertz as specified in Table 1 shall
be applied at the rate of approximately 100 volts
per second between resistor terminals connected
together and the V-block, and held for 5 seconds.
PAGE 6 OF 8
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Bolivar Drive
P.O. Box 547
Bradford, PA 16701
USA
814-362-5536
Fax 814-362-8883
www.koaspeer.com
KOA SPEER ELECTRONICS, INC.
SS-02 R3
11
Flame-proof
(UL-492-2)
The coating cab withstand the overload test, with no possibilities of ignition.
1. Overload Test as per UL-492, Item 13:
A piece of cotton cloth (A piece of gauze untreated corresponding to Nos 32-28
that measures 36 inches in width and 14 - 15 yards per pound) is wound around
a resistor. Then, the resistor is applied with voltage which is increased by two
times, three times, . . . ten times the rated voltage at intervals of one minute till
the resistor is broken down. If the cotton cloth is found igniting, the resistor shall
be considered unacceptable.
The coating is completely proof against any kind of heat sources. Even if
exposed to gas burner flames or heated red with nichrome wire wounded, the
coating will not flame, nor soften and melt to drop.
2. Hot-wire Ignition Test as per UL-492-2, Item 9:
A nichrome wire (Mixture of Cr 20ꢀ and Ni 80ꢀ which measures 0.0201 inches
in diameter and 865 feet per pound, and having 1.61 ohm per foot) is wound a
resistor at intervals of 1/4 inch so as to result in power consumption of 65W or
more. Then, the resistor is heated red with electricity supplied to the nichrome
wire.
12
Resistance to pulse
Resistance change shall
be 5ꢀ of the Pre-test
value.
Test circuit is shown below.
1 sec. on and 1 sec. off 20,000 cycles.
The voltage is applied with maximum pulse volt-
age shown in Table 1.
10k ohm
SW
DC
C = 1000pF
Rx
13
Low Temperature
Operation
Resistance change shall
be 5ꢀ of the Pre-test
value.
Initial resistance shall be measured. The resistors
shall then be exposed to the air stream at -40°C
3°C for 24 hours with no voltage applied, after
which the resistors shall be placed at room
temperature, final resistance shall be measured.
PAGE 7 OF 8
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Bolivar Drive
P.O. Box 547
Bradford, PA 16701
USA
814-362-5536
Fax 814-362-8883
www.koaspeer.com
KOA SPEER ELECTRONICS, INC.
SS-02 R3
14
Thermal Shock
(Method 107)
Resistance change shall
be (2ꢀ 0.05 ohm) of
the Pre-test value.
Initial resistance shall be measured. The resistors
shall be subjected to the temperature cycle speci-
fied below for a total of five cycles, performed con-
tinuously. Temperatures in Steps 1 and 3 shall be
maintained by forced air circulation. The hot and
cold chambers shall be of such capacity that air
temperature will reach the temperatures specified
in Table 4 within 2 minutes after the resistors have
been placed in the appropriate chamber. Final
resistance shall be measured approximately one
hour after completion of the fifth cycle.
Thermal Shock Test Sequence
Step
Temperature (°C)
Time (min.)
30
10 ~ 15
30
1
2
3
4
-40
+25
+85
+25
3
5
2
5
10 ~ 15
15
Moisture Resistance
Resistance change shall
be 5ꢀ of the Pre-test
value.
Initial resistance shall be measured before the
test. Resistors shall be exposed to a temperature
of 40 2°C and a relative humidity of 90 - 95ꢀ, for
1,000 hours. After removal from the chamber, the
resistors shall be allowed to dry at room ambient
for approximately one hour. Final resistance shall
be measured.
16
Moisture Life
(Method 103)
Resistance change shall
be 5ꢀ of the Pre-test
value.
Initial resistance shall be measured. Resistors
shall be placed in a chamber at relative humidity of
90 - 95ꢀ at ambient temperature of 40 2°C.
Then DC RCWV shall be applied intermittently
1-1/2 hr. (on), 1/2 hr. (off) for a total of 1,000 hrs.
After removal from the chamber, the resistors shall
be allowed to dry at room ambient for approxi-
mately 1 hr. Final resistance shall be measured.
17
Operating Life
(Method 108)
Resistance change shall
be 5ꢀ of the Pre-test
value.
Initial resistance shall be measured. Resistors
shall be placed at ambient temperature of 70
3°C. Then DC RCWV shall be applied intermittent-
ly 1-1/2 hr. (on), 1/2 hr. (off) for a total of 1,000 hrs.
After return to room temperature, final resistance
shall be measured.
PAGE 8 OF 8
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Bolivar Drive
P.O. Box 547
Bradford, PA 16701
USA
814-362-5536
Fax 814-362-8883
www.koaspeer.com
AHA 03/01 Notice: The information contained in this Spec Sheet is believed to be accurate and up-to-date. KOA Speer Electronics reserves this right to change these specifications without notice.
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