Texas Instruments SN74ALS29863FN

Overview

SN74ALS29863FN from Rochester Electronics is a quad 2-input positive-NAND gate IC with TTL-compatible inputs, 15 mA output drive capability, propagation delay of 10 ns (typ), and operating voltage range of 4.5 V to 5.5 V. It functions as a logic-level combinatorial gate in bus-interface and control-path circuits for industrial backplanes and legacy computing systems.

For engineers reviewing the SN74ALS29863FN datasheet, SN74ALS29863FN pinout, SN74ALS29863FN application, or SN74ALS29863FN equivalent, key selection criteria include guaranteed TTL input thresholds, fan-out capability into standard TTL loads, DC noise margin at VCC = 5 V, and compatibility with 74ALS family timing and drive specifications.

Technical Context

This device implements four independent 2-input NAND gates in a single monolithic silicon die using bipolar ALS (Advanced Low-power Schottky) process technology. Each gate features open-collector outputs capable of sinking up to 15 mA while maintaining VOH ≥ 2.7 V and VOL ≤ 0.5 V under specified load conditions.

The SN74ALS29863FN adheres to JEDEC MS-012 (SOIC-14) mechanical dimensions and meets MIL-STD-883 Class B screening requirements per Rochester's QML qualification. Input clamp diodes provide ESD protection up to ±2 kV (HBM).

Key Specifications

Pinout & Package

SN74ALS29863FN is housed in a 14-pin plastic small-outline integrated circuit (SOIC) package per JEDEC MS-012, with 1.27 mm pitch and 8.65 mm body width.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input NAND gate applications.

Compared with SN74ALS00AN and SN74F29863N, the SN74ALS29863FN uniquely balances open-collector flexibility, industrial temperature support, and low static power-making it optimal for bus arbitration and legacy system upgrades where wiring simplicity and reliability outweigh raw speed.

Availability

SN74ALS29863FN is available at Aetrix Electronics and suitable for industrial backplane control, legacy computer bus interface, and avionics maintenance interface requiring stable component supply across extended product lifecycles.

Supply support for SN74ALS29863FN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Rochester Electronics is a certified QML and AS9120 distributor specializing in lifecycle-extended, tested, and qualified semiconductor components for defense, aerospace, and industrial applications.

The SN74ALS29863FN belongs to Rochester's manufactured 74ALS logic family, designed to replicate original OEM performance for long-lifecycle systems where obsolescence mitigation and military-grade reliability are critical.

FAQ

What logic family does the SN74ALS29863FN belong to, and why does that matter for system integration?

The SN74ALS29863FN belongs to the 74ALS (Advanced Low-power Schottky) logic family. This matters because it guarantees compatible voltage thresholds, timing behavior, and fan-out characteristics with other 74ALS devices-enabling drop-in replacement in legacy systems without redesigning interface logic or recalculating timing margins. The SN74ALS29863FN maintains this compatibility while delivering open-collector outputs not found in standard 74ALS NAND gates.

Does the SN74ALS29863FN have open-collector outputs, and how does that affect circuit design?

Yes, the SN74ALS29863FN features four open-collector outputs. This requires external pull-up resistors to establish HIGH logic levels and enables wired-AND functionality-critical for bus arbitration, interrupt line sharing, and level translation. Designers must size pull-ups to meet rise-time targets while staying within the 15 mA sink limit per output. The SN74ALS29863FN's open-collector architecture directly supports these functions without added discrete components.

What is the maximum output sink current specification for the SN74ALS29863FN, and how is it used in practice?

The SN74ALS29863FN specifies a maximum output sink current of 15 mA per channel at VO = 0.5 V. In practice, this allows direct driving of TTL inputs (10-unit fan-out), LEDs, and small-signal relays without buffer stages. When designing with the SN74ALS29863FN, engineers verify that total sink current-including all paralleled outputs-stays within absolute maximum ratings and that VCC decoupling handles transient current demands during simultaneous switching.

Is the SN74ALS29863FN qualified for extended temperature operation, and what standards apply?

Yes, the SN74ALS29863FN is qualified for operation from –40 °C to +85 °C and meets MIL-STD-883 Class B screening requirements per Rochester's QML qualification. It carries AS9120 and ISO-9001 certifications, and its testing follows original factory programs or Rochester-developed solutions validated against OEM datasheet limits. This makes the SN74ALS29863FN suitable for uncontrolled industrial and avionics ground-support environments.

How does the SN74ALS29863FN differ from the standard SN74ALS00A in terms of output structure and application impact?

The SN74ALS29863FN uses open-collector outputs, whereas the SN74ALS00A uses totem-pole outputs. This structural difference means the SN74ALS29863FN supports wired-AND bus sharing and level translation, while the SN74ALS00A cannot. Applications requiring shared interrupt lines or mixed-voltage interfacing must use the SN74ALS29863FN-not the SN74ALS00A-to avoid redesigning signal routing or adding external components.