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SN74AHC123AMDREP

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Texas Instruments Monostable Multivibrators, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74AHC123AMDREP

Texas Instruments · Monostable Multivibrators · SOIC-16

SN74AHC123AMDREP from Texas Instruments, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 1A input Gated low-level-active trigger input of multivibrator 1; Schmitt-trigger input with hysteresis for slow input transitions.
2 1B input Gated high-level-active trigger input of multivibrator 1; Schmitt-trigger input with hysteresis for slow input transitions.
3 1CLR input Active-high clear input of multivibrator 1 that terminates the output pulse early; Schmitt-trigger input.
4 1Q output Output of multivibrator 1 that is low during power-up and goes high at the end of the programmed pulse.
5 2Q output Output of multivibrator 2 that is low during power-up and goes high at the end of the programmed pulse.
6 2Cext passive External timing capacitor terminal of multivibrator 2; capacitor connects between Cext and Rext/Cext.
7 2Rext/Cext passive Timing resistor/capacitor terminal of multivibrator 2; external resistor connects between Rext/Cext and VCC.
8 GND power_in Ground reference for the device, with the operating supply range of 2 V to 5.5 V referenced to it.
9 2A input Gated low-level-active trigger input of multivibrator 2; Schmitt-trigger input with hysteresis for slow input transitions.
10 2B input Gated high-level-active trigger input of multivibrator 2; Schmitt-trigger input with hysteresis for slow input transitions.
11 2CLR input Active-high clear input of multivibrator 2 that terminates the output pulse early; Schmitt-trigger input.
12 2Q-bar output Complementary output of multivibrator 2 that is high during power-up and goes low at the end of the programmed pulse.
13 1Q output Complementary output of multivibrator 1 that is high during power-up and goes low at the end of the programmed pulse.
14 1Cext passive External timing capacitor terminal of multivibrator 1; capacitor connects between Cext and Rext/Cext.
15 1Rext/Cext passive Timing resistor/capacitor terminal of multivibrator 1; external resistor connects between Rext/Cext and VCC.
16 VCC power_in Supply voltage input with an operating range of 2 V to 5.5 V.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-16
Category Logic ICs
Pins 16

CAD (KiCad official)

  • Symbol: SN74AHC123AMDREP
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOIC-16 (KiCad packages3D, STEP)
  • 3D model files: sn74ahc123amdrep-etched.step / sn74ahc123amdrep-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74ahc123amdrep.step / sn74ahc123amdrep.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (18 pp, sha256 987996f5646ffa3b, retrieved 2026-10-28, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF