SN74LS132N Quad 2-Input Schmitt Trigger NAND Gate Texas Instruments

TI SN74LS132N 74LS132 Quad Schmitt Trigger NAND Gate - 5V TTL DIP-14, NOS

Condition

Unused NOS. Sourced from an electronics distributor consolidating inventory. Markings legible: SN74LS132N, TI logo, date code 9422 (week 22 of 1994). Lead pins show mild tarnish from age - cleans off with a mild citric acid solution. Evaluation: Visual inspection only. Function testing not performed.

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Product Overview

Texas Instruments SN74LS132N - quadruple 2-input positive-NAND gate with Schmitt-trigger inputs, 14-pin DIP through-hole package. Part of the 74LS (Low-Power Schottky) TTL logic family. Each of the four independent gates applies internal hysteresis to its inputs, converting noisy, slow-rising, or jittery signals into clean digital outputs - making it the go-to chip for switch debouncing, RC oscillators, and clock signal conditioning.

Key Features

• Four independent 2-input NAND gates with Schmitt-trigger inputs
• Logic family: 74LS (Low-Power Schottky TTL)
• Supply voltage: 5V (VCC 4.75V to 5.25V)
• Typical propagation delay: 15ns
• Typical input hysteresis: 0.8V
• Package: 14-pin DIP (through-hole PDIP), breadboard and socket compatible
• Operating temperature: 0°C to 70°C
• Date code 9422 - manufactured week 22, 1994

Applications

• Arcade board repair: swap a failed SN74LS132N out of its DIP socket, drop this one in, and confirm the board comes back up - exact pinout and TTL electrical behavior preserved
• Retro computer restoration: replace faulty logic in vintage machines where substituting a CMOS 74HC132 would change input thresholds and risk incompatibility with surrounding TTL circuitry
• Breadboard prototyping: wire up a classic RC oscillator or switch debounce circuit in an afternoon without chasing false triggers from noisy input signals
• Digital lab exercises: demonstrates NAND gate truth tables and Schmitt-trigger hysteresis behavior in a well-documented, widely understood package
• Makers building clock dividers, tone generators, or touch-sensor interfaces where the Schmitt trigger's hysteresis cleans up the messy real-world signals that standard gates choke on

Frequently Asked Questions

Is this a through-hole part? Will it fit a standard breadboard or DIP socket?

Yes. The SN74LS132N is a 14-pin PDIP (Plastic Dual In-line Package) with standard 0.1-inch pin spacing. It fits breadboards, DIP-14 sockets, and through-hole PCBs directly.

Can I use this as a direct drop-in replacement for a 74LS132 or SN74LS132 on an existing board?

Yes. SN74LS132N, 74LS132, and SN74LS132 are the same device. The SN prefix is Texas Instruments' package designator and does not affect pinout or electrical characteristics.

Will this work as a substitute for a 74HC132 or 74HCT132?

The 74HC132 and 74HCT132 share the same logic function and pinout, but the 74LS series requires a 5V supply and has different input thresholds and output drive characteristics than the HC family. In a TTL-based circuit the SN74LS132N is the correct choice. Substituting into a CMOS-supply circuit running below 5V is not appropriate without reviewing the surrounding circuit's voltage and loading requirements.

What about the tarnished pins - is the part still usable?

Yes. The tarnish is surface oxidation from age and does not affect function. It cleans off with a mild citric acid solution before soldering or socketing. The chip itself is unused NOS.

Thirty years in storage, one week of production in 1994 stamped right on the case - and it is still waiting to do exactly what it was built for. Drop it in, clean up those signals, and let it finish the job.