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Signetics N7413A Obsolete TTL Dual 4-Input NAND Schmitt Trigger DIP-14 Vintage Arcade Logic IC

ICs / Integrated Circuits • SKU RFB00523

$7.95

Vintage Signetics N7413A TTL dual 4-input NAND Schmitt-trigger integrated circuit in a 14-pin DIP package. This exact Signetics N7413A is OBSOLETE and DISCONTINUED legacy production and is no longer manufactured by Signetics, making original examples useful for restoration, replacement stock, vintage electronics repair, and period-correct digital equipment.

The N7413A contains two independent four-input NAND gates incorporating Schmitt-trigger inputs. Unlike an ordinary NAND gate, the Schmitt-trigger input structure provides hysteresis between the positive-going and negative-going switching thresholds. This allows slowly changing or noisy input signals to be converted into clean, sharply defined TTL output transitions and improves noise immunity in demanding control and timing circuits.

The device operates from the classic 5V TTL supply system and was designed for use in computers, arcade machines, industrial controls, communications equipment, instrumentation, test equipment, timing circuits, pulse-shaping circuits, switch-conditioning circuits, control systems, and many other early digital electronic assemblies.

This particular part carries the original Signetics N7413A marking along with vintage manufacturing markings, making it representative of the early generations of 7400-series TTL technology used extensively throughout the 1970s electronic industry.

HISTORICAL BACKGROUND:

The 7413 was introduced during the formative period of 7400-series transistor-transistor logic when equipment designers commonly constructed complete digital control systems from individual logic ICs. The 7413 provided a particularly useful function because its Schmitt-trigger inputs could tolerate slow-moving or noisy signals that could cause unreliable switching when connected directly to conventional TTL gates.

Typical applications included mechanical switch conditioning, pulse shaping, oscillator and timing support, industrial sensing and control, computer peripheral interfaces, instrumentation, communications hardware, test equipment, and digital control circuits. Designers could use the device wherever a four-input NAND logic function and improved input noise immunity were required.

The 7413 also has documented history in early coin-operated arcade machines. Atari service documentation lists the 7413 among the integrated circuits used in the Anti-Aircraft II arcade game, and Atari Outlaw documentation likewise identifies the 7413 as part of the game's original logic circuitry. Early arcade boards relied heavily on individual 7400-series TTL devices for game logic, timing, video generation, input conditioning, counters, control functions, and interface circuitry.

Because of that history, an original Signetics N7413A is useful not only for general vintage electronics restoration but also as vintage arcade repair stock. It should not be considered an arcade-exclusive IC, however; the device was a general-purpose logic component used across a broad range of electronic equipment.

The exact Signetics N7413A is obsolete legacy production. Modern logic families may provide related Schmitt-trigger NAND functions, but substitutions must be evaluated carefully because logic thresholds, propagation characteristics, drive capability, package, pinout, and electrical behavior can differ from the original standard-TTL device.