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Texas Instruments SN74AS240N — Logic ICs

SN74AS240N Bus Driver, AS Series, Active

MPNSN74AS240N
End of Life

Texas Instruments SN74AS240N, AS Series, Bus Driver, Package: Bulk, RoHS non-compliant, Active lifecycle.

$0.95Ref. price · indicative, final on quote
RoHSRoHS non-compliant
Series*
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74AS240N specifications
ParameterValue
Series*
PackageBulk

Product details

Bus driver in the AS family — what you're looking at

The Texas Instruments SN74AS240N is an octal bus driver from the AS (Advanced Schottky) logic family. It buffers and drives heavily loaded backplane or memory-array lines.

Active, but watch the RoHS flag

The catch is the RoHS compliance status: this variant is listed as RoHS non-compliant. That means it uses lead-bearing solder terminations and is not acceptable for new designs targeting RoHS-required markets (EU, California, etc.) unless a specific exemption applies. For legacy repair, retrofit, or military/aerospace builds that are exempt or explicitly allow tin-lead, this is exactly the part you want — the lead finish is more robust against tin whiskers in high-reliability environments.

Where it sits in the cycle

The active status indicates TI continues to run AS-series wafers. Demand is steady from legacy industrial and defense programs.

Frequently asked questions

Does SN74AS240N have a datasheet?

Yes, the full datasheet for the SN74AS240N is available from Texas Instruments. It covers the electrical characteristics, switching waveforms, and application information for the AS240 octal buffer/line driver. The datasheet is the authoritative source for the device's operating conditions and timing parameters.

How does SN74AS240N compare to 74LS240?

The SN74AS240N is the higher-performance sibling in the Advanced Schottky family. Compared to the 74LS240, the AS version offers significantly faster propagation delays (typical in the 5-7 ns range versus 12-18 ns for LS) and higher output drive current (64 mA sink versus 24 mA for LS). The trade-off is higher supply current. Both are 5 V, inverting three-state octal buffers with the same pinout, so they are drop-in compatible on the board. The AS part is the choice when the bus timing budget is tight or the capacitive load is high.