Triple 3-input NAND in the 74AS family
The Texas Instruments SN74AS10D is a triple 3-input NAND gate from the 74AS (Advanced Schottky) logic family, packaged in a 14-SOIC. It operates on a 4.5 V to 5.5 V supply and is rated for the commercial temperature range of 0°C to 70°C. The 4.5 ns propagation delay at 5V, 50pF makes it one of the faster 5V NAND options in a small SOIC footprint — suited for timing-critical glue logic in legacy 5V backplanes, industrial control cards, and test equipment where a full 74F or 74ALS bus is already in place.
4.5 ns propagation delay — what it buys you
At 4.5 ns max into 50 pF, this gate clears the critical path in a 5V synchronous bus running at 50 MHz or below. The trade-off is input count: three inputs per gate here versus two on the 74F00, so the SN74AS10D suits 3-input address decoding or enable logic without cascading an extra inverter.
Active lifecycle — no LTB pressure
The SN74AS10D carries an Active product status per TI's current lifecycle designation. That means no last-time-buy window to track, no risk of a sudden EOL notice derailing a production run. For a BOM that already uses 74AS or 74F logic, this gate is a safe long-term choice — no need to qualify a drop-in replacement unless the system migrates to a lower-voltage core.
Output drive and logic thresholds
Outputs sink 20 mA and source 2 mA. The input thresholds are 0.8 V low and 2 V high, standard for 5V TTL-compatible logic.