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Texas Instruments SN74AS643N — Logic ICs

SN74AS643N Bus Driver/Transceiver, Active

MPNSN74AS643N
End of Life

Texas Instruments SN74AS643N bus driver/transceiver, series *, active lifecycle, RoHS non-compliant, Bulk package.

$3.1Ref. price · indicative, final on quote
Texas Instruments SN74AS643N datasheet (PDF)
RoHSRoHS non-compliant
Series*
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74AS643N specifications
ParameterValue
Series*
PackageBulk

Product details

Bus transceiver for backplane and memory-mapped I/O

The Texas Instruments SN74AS643N is a bus driver/transceiver from the AS logic family, designed for bidirectional data transfer on a common bus. It handles the line-driving and direction-control tasks typical in backplane, memory-mapped I/O, and processor-to-peripheral interfaces where the bus needs to be actively driven in both directions.

RoHS non-compliance — design-in constraint

The SN74AS643N is listed as RoHS non-compliant. That means the device uses lead-bearing solder terminations, which rules it out for designs that require full RoHS compliance or lead-free reflow profiles.

Frequently asked questions

What is the difference between SN74AS643N and SN74ALS643N?

Both are bus transceivers from Texas Instruments, but the SN74AS643N belongs to the Advanced Schottky (AS) family, which typically offers higher speed and drive capability compared to the Advanced Low-Power Schottky (ALS) family of the SN74ALS643N. The AS variant draws more supply current for the speed advantage. Pin-compatibility is the same, so a direct swap is possible if the system can tolerate the higher power and has the noise margin for the faster edges.