# 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](https://www.ti.com/lit/ds/symlink/sn74ahc123amdrep.pdf) (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](docs/sn74ahc123amdrep-datasheet.pdf)