Texas Instruments SN74ALS02N Quad 2-Input NOR Gate DIP-14 HP 1820-2739

Texas Instruments SN74ALS02N Advanced Low-Power Schottky TTL logic IC in a 14-pin DIP package. The device contains four independent 2-input NOR gates used in digital logic, control, switching, interface, instrumentation, and general-purpose logic applications.

This device carries the Texas Instruments SN74ALS02N designation along with Hewlett-Packard house part number 1820-2739. The examples are marked Malaysia with production code 9040CS.

The SN74ALS02N belongs to the 74ALS Advanced Low-Power Schottky TTL family, developed to provide lower power consumption while retaining useful switching performance for commercial, industrial, computing, communications, and test-equipment applications.

Lifecycle: DISCONTINUED.

HISTORICAL BACKGROUND:
The 7400-series logic family became one of the fundamental building blocks of digital electronics beginning in the 1960s. Standardized logic devices allowed engineers to construct complex digital systems using individual gates, flip-flops, counters, buffers, decoders, multiplexers, and other logic functions.

The 74ALS family represented a later development of TTL technology. Advanced Low-Power Schottky logic reduced power requirements compared with earlier TTL families while maintaining the familiar 7400-series architecture used throughout industrial and commercial electronics.

The SN74ALS02N contains four independent two-input NOR gates in a standard 14-pin dual-inline package. NOR gates are universal logic elements used for control logic, signal gating, timing functions, state control, digital interfaces, instrumentation, and computer circuitry.

This device is particularly interesting because it also carries Hewlett-Packard part number 1820-2739. Hewlett-Packard routinely assigned internal house numbers to semiconductor devices used throughout its test equipment, instrumentation, computers, communications hardware, and other electronic products.

Vintage Hewlett-Packard service documentation frequently identifies replacement components by HP house number. Devices carrying the original HP marking can therefore be useful when restoring or repairing period HP equipment where correct component identification is important.

The Malaysia marking reflects Texas Instruments semiconductor production during the period when large quantities of TTL logic devices were manufactured for OEM, industrial, computing, and instrumentation applications.

Today these original TI devices with HP house markings are useful as legacy repair stock, vintage equipment replacements, restoration components, and original-era semiconductor inventory.