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UA9638CD

UA9638CD RS422/RS485 Driver, 2/0, 8-SOIC, 0-70°C

MPNUA9638CD
End of Life

Texas Instruments UA9638CD, Type Driver, Protocol RS422/RS485, 2/0 Drivers/Receivers, 4.75V~5.25V Supply, 0°C~70°C, 8-SOIC Package.

$1.62Ref. price · indicative, final on quote
Texas Instruments UA9638CD datasheet (PDF)
Packaging8-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

UA9638CD specifications
ParameterValue
TypeDriver
MountingSurface Mount
Supply voltage4.75V ~ 5.25V
ProtocolRS422, RS485
Operating temperature0°C ~ 70°C
PackageTube
Case8-SOIC (0.154\", 3.90mm Width)
Number of drivers (Receivers)2/0

Product details

What this dual RS422/RS485 line driver is for

It provides two differential outputs with no integrated receiver — this is a pure driver, not a transceiver. Typical applications include industrial control backplanes, point-to-point data links, and differential signalling over twisted-pair cables where the receiver is handled by a separate part like the UA9637 or SN75175.

That rules out 3.3 V-only buses — if your system runs on a 3.3 V supply, this driver needs a separate 5 V rail or a level shifter. UA9638CDR) would be needed.

Package and mounting — board-level fit

Frequently asked questions

What is the difference between UA9638CD and SN75176?

The UA9638CD is a dual driver (2/0) with no receiver, while the SN75176 is a single transceiver (1/1) combining one driver and one receiver in the same package. The UA9638CD is used when you need two differential outputs from one IC; the SN75176 handles bidirectional communication on a single pair.

Is UA9638CD compatible with RS485?

Yes, the UA9638CD is specified for both RS422 and RS485 protocols. It drives differential signals on RS485 buses, but because it contains no receiver, the bus termination and fail-safe biasing must be handled externally.