MC74A6-3.3SNTR [ONSEMI]

Switch/Digital Output Temperature Sensor, DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT, SOT-23, 5 PIN;


型号：	MC74A6-3.3SNTR
厂家：	ONSEMI
描述：	Switch/Digital Output Temperature Sensor, DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT, SOT-23, 5 PIN 输出元件传感器换能器
文件：	总12页 (文件大小：129K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MC74

Serial Digital

Temperature Sensor

The MC74 is a serial digital temperature sensor suited for low cost

applications. Temperature data is converted from the integrated

thermal sensing element and made available as an 8–bit serial digital

word. Communication with the MC74 is accomplished via 2–wire

SMBus/I²C–compatible serial port. Temperature resolution is 1°C.

Conversion rate is a nominal 8 samples/sec. Power consumption is

only 200 µA (5.0 µA Standby).

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SOT–23

SN SUFFIX

CASE 1212

Features

• Temperature Range: –40°C to +125°C

• Outputs Temperature as an 8–Bit Digital Word

• Simple Serial Port Interface

• Solid State Temperature Sensing:

±2°C Accuracy from +25°C to +85°C

±3°C Accuracy from 0°C to +125°C

TO–220

T SUFFIX

CASE 314D

• 3.3 V and 5.5 V Operating Range

• Low Power

200 µA Operations

5.0 µA Standby Mode

Typical Applications

• Thermal Protection for Hard Disk Drives and Other PC Peripherals

• Low–Cost Thermostat Controls

• Power Supplies

PIN CONNECTIONS

GND

SDA

SCL

FUNCTIONAL BLOCK DIAGRAM

Serial Port

Interface

Internal Sensor

(Diode)

SDA

SCL

(Top View)

SOT–23A*

NOTE: *SOT–23A is equivalent to EIAJ–SC74A

DS Modulator

Control

Logic

ORDERING INFORMATION

See detailed ordering and shipping information on page 9 of

this data sheet.

Temperature

DEVICE MARKING INFORMATION

See general marking information in the device marking

section on page 9 of this data sheet.

Semiconductor Components Industries, LLC, 2000

Publication Order Number:

November, 2000 – Rev. 1

MC74/D

MC74

PIN DESCRIPTION FOR TO–220–5

Pin No.

Symbol

Type

None

Description

Not Connected

SDA

GND

SCL

Bi–directional

Power

SMBus Serial Data

System Ground

Input

SMBus Serial Clock

Power Supply Input

Power

PIN DESCRIPTION FOR SOT–23–5

Pin No.

Symbol

Type

None

Description

Not Connected

GND

Power

System Ground

Power

Power Supply Input

SMBus Serial Clock

SMBus Serial Data

SCL

SDA

Input

Bi–directional

PIN DESCRIPTION

V_DD

SCL

SMBus Serial Clock Input. Clocks data into and out of the

MC74. See System Management Bus Specification, rev. 1.0,

for timing diagrams.

Power Supply Input. See electrical specifications.

GND

Ground return for all MC74 functions.

SDA

Bi–directional Input/Output. Serial data is transferred on

the SMBus in both directions using this pin. See System

Management Bus Specification rev. 1.0 for timing diagrams.

ABSOLUTE MAXIMUM RATINGS*

Rating

Symbol

Value

Unit

Power Supply Voltage

6.0

Voltage on Any Pin

–

(GND –0.3 V) to (V +0.3 V)

Operating Temperature Range

Storage Temperature Range

Current on Any Pin

–40 to +125

–65 to +150

±50

°C

stg

°C

–

°C/W

Package Thermal Resistance

330

*Maximum Ratings are those values beyond which damage to the device may occur.

*Static–sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses

above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional

operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied.

Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability.

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MC74

DC ELECTRICAL CHARACTERISTICS (V = 3.3 V or 5.0 V (Note 5.), –40°C ≤ T ≤ 125°C, unless otherwise noted.)

Characteristic

Symbol

Min

Typ

Max

Unit

Power Supply

Power–On Reset Threshold

POR

1.2

–

2.2

350

(V Falling Edge or Rising Edge)

Operating Current

200

5.0

(V = 5.5V, Serial Port Inactive) (Note 1.)

Standby Supply Current

DD–STANDBY

–

(V = 3.3 V, Serial Port Inactive) (Note 4.)

Temperature–to–Bits Converter

Temperature Accuracy MC74A

ERR

°C

–2.0

–3.0

–

±2.0

+2.0

+3.0

–

+25°C ≤ T ≤ +85°C

0°C ≤ T ≤ +125°C

–40°C ≤ T ≤ 0°C

Conversion Rate (Note 2.)

4.0

8.0

–

sa/sec

Serial Port Interface

Logic Input High

0.8 x V

–

Logic Input Low

0.2 x V

SDA Output Low

–

0.4

0.6

= 3 mA (Note 3.)

= 6 mA (Note 3.)

Input Capacitance SDA, SCL

I/O Leakage

–

5.0

0.1

–

–1.0

1.0

LEAK

SERIAL PORT AC TIMING (V = 3.3 V or 5.0 V (Note 5.), –40°C ≤ (T = T ) ≤ 125°C; C = 80 pF unless otherwise noted.)

Characteristic

Symbol

Min

Typ

Max

Unit

SMBus Clock Frequency

–

100

kHz

SMB

Low Clock Period (10% to 10%)

High Clock Period (90% to 90%)

SMBus Rise Time (10% to 90%)

SMBus Fall Time (90% to 10%)

4.7

4.0

–

msec

nsec

msec

LOW

HIGH

1,000

300

–

Start Condition Setup Time (90% SCL to 10% SDA)

(for Repeated Start Condition)

4.0

SU(START)

Start Condition Hold Time

Data in Setup Time

4.0

1,000

1,250

4.0

–

msec

nsec

msec

H(START)

SU–DATA

Data in Hold Time

–

H–DATA

Stop Condition Setup Time

Bus Free Time Prior to New Transition

–

SU(STOP)

4.7

–

IDLE

Power–On Reset Delay (V ≥ V

(Rising Edge))

POR

–

500

POR

1. Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification.

2. Maximum guaranteed conversion time after Power–On RESET (POR to DATA_RDY) is 250 msec.

3. Output current should be minimized for best temperature accuracy. Power dissipation within the MC74 will cause self–heating and

temperature drift error.

4. SDA and SCL must be connected to V or GND.

5. V = 3.3 V for MC74–33SNTR. V = 5.0 V for MC74–50T. All part types of the MC74 will operate properly over the wider power supply

range of 2.7 V to 5.5 V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As V varies from the nominal

value, accuracy will degrade 1°C/V of V change.

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MC74

DETAILED OPERATING DESCRIPTION

MC74 Serial Bus Conventions

The MC74 acquires and converts temperature

information from its integrated solid state sensor with a

basic accuracy of ±1°C . It stores the data in an internal

interface is a slave SMBus. The temperature data can be read

at any time through the SMBus port. Eight SMBus addresses

are programmable for the MC74, which allows for a

multi–sensor configuration. Also, there is low–power

Standby mode where temperature acquisition is suspended.

Term

Transmitter

Receiver

Master

Explanation

The device sending data to the bus.

The device receiving data from the bus.

The device which controls the bus: initiating

transfers (START), generating the clock, and

terminating transfers (STOP).

Slave

Start

The device addressed by the master.

A unique condition signaling the beginning of a

transfer indicated by SDA falling (High–Low)

while SCL is high.

Standby Mode

The MC74 allows the host to put it into a low power

(I_DD= 5.0 µA, typical) Standby mode. In this mode, the A/D

converter is halted and the temperature data registers are

frozen. The SMBus port operates normally. Standby mode

is enabled by setting the SHDN bit in the CONFIG register.

The table below summarizes this operation.

Stop

ACK

A unique condition signaling the end of a trans-

fer indicated by SDA rising (Low–High) while

SCL is high.

A receiver acknowledges the receipt of each

byte with this unique condition. The receiver

drives SDA low during SCL high of the ACK

clock–pulse. The Master provides the clock

pulse for the ACK cycle.

Standby Mode Operation

SHDN Bit

Operating Mode

Normal

Busy

Communication is not possible because the bus

is in use.

Standby

NOT Busy

Data Valid

When the bus is idle, both SDA and SCL will

remain high.

SMBus Slave Address

The MC74 is internally programmed to have a default

SMBus address value of 1001 101b. Seven other addresses

are available by custom order (contact factory).

The state of SDA must remain stable during the

High period of SCL in order for a data bit to be

considered valid. SDA only changes state while

SCL is low during normal data transfers (see

Start and Stop conditions).

SERIAL PORT OPERATION

The Serial Clock input (SCL) and bi–directional data port

(SDA) form a 2–wire bi–directional serial port for

programming and interrogating the MC74. The following

conventions are used in this bus architecture:

All transfers take place under control of a host, usually a

CPU or microcontroller, acting as the Master which

provides the clock signal for all transfers. The MC74 always

operates as a Slave. The serial protocol is illustrated in

Figure 1. All data transfers have two phases; all bytes are

transferred MSB first. Accesses are initiated by a start

condition (START), followed by a device address byte and

one or more data bytes. The device address byte includes a

Read/Write selection bit. Each access must be terminated by

Stop Condition (STOP).

convention called

Acknowledge (ACK) confirms receipt of each byte. Note

that SDA can change only during periods when SCL is LOW

(SDA changes while SCL is HIGH are reserved for Start and

Stop Conditions).

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MC74

Write Byte Format

ADDRESS

ACK

COMMAND

8 Bits

DATA

7 Bits

8 Bits

Slave Address

Command Byte: selects

which register you are

writing to.

Data Byte: data goes

into the register set

by the command byte.

Read Byte Format

ADDRESS WR ACK

COMMAND ACK

ADDRESS RD ACK

DATA NACK

7 Bits

8 Bits

7 Bits

8 Bits

Slave Address

Command Byte: selects

which register you are

reading from.

Slave Address: repeated

due to change in data–

flow direction.

Data Byte: reads from

the register set by the

command byte.

Receive Byte Format

ADDRESS RD ACK

7 Bits

DATA NACK

8 Bits

Data Byte: reads data from

the register commanded by

the last Read Byte or Write

Byte transmission.

S = Start Condition

P = Stop Condition

Shaded = Slave Transmission

Figure 1. SMBus Protocols

Start Condition (START)

Acknowledge (ACK)

The MC74 continuously monitors the SDA and SCL lines

for a start condition (a HIGH to LOW transition of SDA

while SCL is HIGH) and will not respond until this condition

is met.

Acknowledge (ACK) provides a positive handshake

between the host and the MC74. The host releases SDA after

transmitting eight bits, then generates a ninth clock cycle to

allow the MC74 to pull the SDA line LOW to acknowledge

that it successfully received the previous eight bits of data or

address.

Address Byte

Immediately following the Start Condition, the host must

transmit the address byte to the MC74. The states of A1 and

A0 determine the 7–bit SMBus address for the MC74. The

7–bit address transmitted in the serial bit stream must match

for the MC74 to respond with an Acknowledge (indicating

the MC74 is on the bus and ready to accept data). The eighth

bit in the Address Byte is a Read–Write Bit. This bit is a 1

for a read operation or 0 for a write operation. During the

first phase of any transfer this bit will be set = 0 to indicate

that the command byte is being written.

Data Byte

After a successful ACK of the address byte, the host must

transmit the data byte to be written or clock out the data to

be read. (See the appropriate timing diagrams. ) ACK will

be generated after a successful write of a data byte into the

MC74.

Stop Condition (STOP)

Communications must be terminated by a stop condition

(a LOW to HIGH transition of SDA while SCL is HIGH).

The Stop Condition must be communicated by the

transmitter to the MC74. NOTE: Refer to Timing Diagrams

for serial bus timing (Figure 2).

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MC74

SMBUS Write Timing Diagram

E F

LOW HIGH

SCL

SDA

SU(STOP) IDLE

SU(START) H(START)

SU–DATA

H–DATA

A = Start Condition

F = Acknowledge Bit Clocked into Master J = Acknowledge Clocked into Master

B = MSB of Address Clocked into Slave G= MSB of Data Clocked into Slave

C = LSB of Address Clocked into Slave H = LSB of Data Clocked into Slave

D = R/W Bit Clocked into Slave

E = Slave Pulls SDA Line Low

K = Acknowledge Clock Pulse

L = Stop Condition, Data Executed by Slave

M= New Start Condition

I = Slave Pulls SDA Line Low

SMBUS Read Timing Diagram

E F

LOW HIGH

SCL

SDA

IDLE

SU(START) H(START)

SU–DATA

SU(STOP)

A = Start Condition

E = Slave Pulls SDA Line Low

I = Acknowledge Clock Pulse

J = Stop Condition

K = New Start Condition

B = MSB of Address Clocked into Slave

C = LSB of Address Clocked into Slave

D = R/W Bit Clocked into Slave

F = Acknowledge Bit Clocked into Master

G= MSB of Data Clocked into Master

H = LSB of Data Clocked into Master

Figure 2. Timing Diagrams

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MC74

Temperature Register (TEMP), 8–Bits,

READ–ONLY

MC74 Command Set

The binary value (2’s complement format) in this register

represents temperature of the integrated sensor following a

conversion cycle. The registers are automatically updated in

an alternating manner.

(SMBus READ_BYTE and WRITE_BYTE)

Command Byte Description

Command

RTR

Code

00h

Function

Read Temperature (TEMP)

Read/Write Configuration (CONFIG)

Temperature Register (TEMP)

RWCR

01h

D[7]

D[6]

D[5]

D[4]

D[3]

D[2]

D[1]

D[0]

LSB

MSB

Configuration Register (CONFIG), 8–BITS,

READ/WRITE

In the temperature data registers, each unit value

represents one degree (Celsius). The value is in

2’s–complement binary format such that a reading of 0000

0000b corresponds to 0°C. Examples of this temperature to

binary value relationship are shown in the following table.

Configuration Register (Config)

D[7]

D[6]

D[5] D[4] D[3] D[2] D[1] D[0]

SHDN

Data Rdy Reserved

Bit

POR

Function

Type

Operation

Temperature–to–Digital Value Conversion (TEMP)

ACTUAL

TEMPERATURE

REGISTERED

TEMPERATURE

D[7]

STANDBY

switch

Read/

Write

1 = stand-

by,

BINARY HEX

0111 1111

0001 1001

0000 0001

0000 0000

1111 1111

1110 0111

1110 0110

1100 1001

1011 1111

0 = normal

+130.00°C

+127.00°C

+126.50°C

+25.25°C

+0.50°C

+0.25°C

0.00°C

+127°C

+25°C

+1°C

0°C

D[6]

Data Ready*

Read

Only

1 = ready,

0 = not

ready

D[5]–D[0]

Reserved –

Always returns

zero when

read.

N/A

*DATA_RDY bit reset at power–up and SHDN enable (see below).

0°C

-0.25°C

0°C

-0.50°C

0°C

-0.75°C

-1°C

-1.00°C

-1°C

-25.00°C

-25.25°C

-54.75°C

-55.00°C

-65.00°C

-25°C

-55°C

-65°C

DATA_RDY

SHDN

conv

The MC74’s register set is summarized below. All

registers are 8–bits wide.

Figure 3. DATA_RDY, SHDN Operation Logic Diagram

Name

Description

POR State

Read Write

TEMP

Internal sensor

temperature

0000 0000b*

√

(2’s complement)

CONFIG CONFIG register

0000 0000b

√

*NOTE: The TEMP register immediately will be updated by the A/D

converter after the DATA_RDY bit goes high.

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MC74

TAPING FORM

Component Taping Orientation for 5L SOT–23 Devices

USER DIRECTION OF FEED

DEVICE

MARKING

PIN 1

Standard Reel Component Orientation

for TR Suffix Device

(Mark Right Side Up)

Tape & Reel Specifications Table

Package

5L SOT–23A

Tape Width (W)

Pitch (P)

Part Per Full Reel

Diameter

8 mm

4 mm

3000

7 inches

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MC74

ORDERING INFORMATION AND DEVICE MARKINGS

Device

Marking (xx)

Package

Voltage

Address

1001 000

1001 001

1001 010

1001 011

1001 100

1001 101

1001 110

1001 111

1001 000

1001 001

1001 010

1001 011

1001 100

1001 101

1001 110

1001 111

1001 000

1001 001

1001 010

1001 011

1001 100

1001 101

1001 110

1001 111

1001 000

1001 001

1001 010

1001 011

1001 100

1001 101

1001 110

1001 111

Shipping

MC74A0–3.3SNTR

MC74A1–3.3SNTR

MC74A2–3.3SNTR

MC74A3–3.3SNTR

MC74A4–3.3SNTR

MC74A5–3.3SNTR*

MC74A6–3.3SNTR

MC74A7–3.3SNTR

MC74A0–5.0SNTR

MC74A1–5.0SNTR

MC74A2–5.0SNTR

MC74A3–5.0SNTR

MC74A4–5.0SNTR

MC74A5–5.0SNTR*

MC74A6–5.0SNTR

MC74A7–5.0SNTR

MC74A0–3.3T

3000 Units / Tape & Reel

SOT–23A–5

3.3 V V

5.0 V V

3.3 V V

5.0 V V

SOT–23A–5

TO–220–5

3000 Units / Tape & Reel

MC74A1–3.3T

MC74A2–3.3T

MC74A3–3.3T

MC74A4–3.3T

MC74A5–3.3T

MC74A6–3.3T

MC74A7–3.3T

MC74A0–5.0T

MC74A1–5.0T

MC74A2–5.0T

MC74A3–5.0T

MC74A4–5.0T

MC74A5–5.0T*

MC74A6–5.0T

MC74A7–5.0T

*Default voltages and addresses: Contact your ON Semiconductor sales representative for other voltage and address options.

= Specific Device Code

= Assembly Location

SOT–23

SN SUFFIX

CASE 1212

TO–220

T SUFFIX

CASE 314D

MC74xx??

AWLYWW

WL, L = Wafer Lot

= Year

WW = Work Week

xxYW

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MC74

PACKAGE DIMENSIONS

TO–220

T SUFFIX

CASE 314D–04

ISSUE E

SEATING

–T–

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

PLANE

–Q–

2. CONTROLLING DIMENSION: INCH.

3. DIMENSION D DOES NOT INCLUDE

INTERCONNECT BAR (DAMBAR) PROTRUSION.

DIMENSION D INCLUDING PROTRUSION SHALL

NOT EXCEED 10.92 (0.043) MAXIMUM.

INCHES

DIM MIN MAX

0.613 14.529 15.570

MILLIMETERS

MIN MAX

1 2 3 4 5

0.572

0.390

0.170

0.025

0.048

0.415

0.180

0.038

0.055

9.906 10.541

4.318

0.635

1.219

4.572

0.965

1.397

0.067 BSC

1.702 BSC

0.087

0.015

0.990

0.320

0.140

0.105

0.112 2.210

0.025 0.381

2.845

0.635

1.045 25.146 26.543

D 5 PL

0.365 8.128

0.153 3.556

0.117 2.667

9.271

3.886

2.972

T Q

0.356 (0.014)

SOT–23

SN SUFFIX

CASE 1212–01

ISSUE O

NOTES:

1. DIMENSIONS ARE IN MILLIMETERS.

2. INTERPRET DIMENSIONS AND TOLERANCES

PER ASME Y14.5M, 1994.

0.05

3. DATUM C IS A SEATING PLANE.

MILLIMETERS

DIM MIN

MAX

0.10

1.30

0.50

0.25

3.00

3.10

1.80

0.00

1.00

0.30

0.10

2.80

2.50

1.50

0.10

C B

0.95 BSC

1.90 BSC

0.20

0.45

---

0.75

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MC74

Notes

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MC74

ON Semiconductor and

are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes

without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular

purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,

including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or

specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be

validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.

SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications

intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or

death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold

SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable

attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim

alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.

PUBLICATION ORDERING INFORMATION

NORTH AMERICA Literature Fulfillment:

CENTRAL/SOUTH AMERICA:

Literature Distribution Center for ON Semiconductor

P.O. Box 5163, Denver, Colorado 80217 USA

Spanish Phone: 303–308–7143 (Mon–Fri 8:00am to 5:00pm MST)

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Phone: 303–675–2175 or 800–344–3860 Toll Free USA/Canada

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Toll Free from Hong Kong & Singapore:

Fax Response Line: 303–675–2167 or 800–344–3810 Toll Free USA/Canada

N. American Technical Support: 800–282–9855 Toll Free USA/Canada

001–800–4422–3781

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German Phone: (+1) 303–308–7140 (Mon–Fri 2:30pm to 7:00pm CET)

Email: ONlit–german@hibbertco.com

French Phone: (+1) 303–308–7141 (Mon–Fri 2:00pm to 7:00pm CET)

Email: ONlit–french@hibbertco.com

Email: ONlit–asia@hibbertco.com

JAPAN: ON Semiconductor, Japan Customer Focus Center

4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–0031

Phone: 81–3–5740–2700

Email: r14525@onsemi.com

English Phone: (+1) 303–308–7142 (Mon–Fri 12:00pm to 5:00pm GMT)

Email: ONlit@hibbertco.com

ON Semiconductor Website: http://onsemi.com

EUROPEAN TOLL–FREE ACCESS*: 00–800–4422–3781

For additional information, please contact your local

Sales Representative.

*Available from Germany, France, Italy, UK, Ireland

MC74/D

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MC74A6-3.3SNTR [ONSEMI]

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