# 74HCT126PW

**Nexperia** · Buffers, Drivers, Receivers, Transceivers · TSSOP-14

74HCT126PW from Nexperia, in a TSSOP-14. 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 | 1OE | input | Data enable input for buffer 1, active HIGH; a LOW level puts output 1Y into the high-impedance OFF-state. |
| 2 | 1A | input | Data input for buffer 1; the input has clamp diodes, and the recommended input voltage range is 0 V to VCC. |
| 3 | 1Y | tri_state | Data output for buffer 1 with 3-state capability; the output is high-impedance when 1OE is LOW. |
| 4 | 2OE | input | Data enable input for buffer 2, active HIGH; a LOW level puts output 2Y into the high-impedance OFF-state. |
| 5 | 2A | input | Data input for buffer 2; the input has clamp diodes, and the recommended input voltage range is 0 V to VCC. |
| 6 | 2Y | tri_state | Data output for buffer 2 with 3-state capability; the output is high-impedance when 2OE is LOW. |
| 7 | GND | power_in | Ground (0 V) reference for all voltages on the device. |
| 8 | 3Y | tri_state | Data output for buffer 3 with 3-state capability; the output is high-impedance when 3OE is LOW. |
| 9 | 3A | input | Data input for buffer 3; the input has clamp diodes, and the recommended input voltage range is 0 V to VCC. |
| 10 | 3OE | input | Data enable input for buffer 3, active HIGH; a LOW level puts output 3Y into the high-impedance OFF-state. |
| 11 | 4Y | tri_state | Data output for buffer 4 with 3-state capability; the output is high-impedance when 4OE is LOW. |
| 12 | 4A | input | Data input for buffer 4; the input has clamp diodes, and the recommended input voltage range is 0 V to VCC. |
| 13 | 4OE | input | Data enable input for buffer 4, active HIGH; a LOW level puts output 4Y into the high-impedance OFF-state. |
| 14 | VCC | power_in | Supply voltage; 4.5 V to 5.5 V recommended for 74HCT126, with an absolute maximum of 7 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | TSSOP-14 |
| Category | Logic |
| Pins | 14 |

## CAD (KiCad official)

- Symbol: `74HCT126PW`
- Footprint: `Package_SO:TSSOP-14_4.4x5mm_P0.65mm`
- 3D model: TSSOP-14 (KiCad packages3D, STEP)
- 3D model files: `74hct126pw-etched.step` / `74hct126pw-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `74hct126pw.step` / `74hct126pw.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Nexperia datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588883654211092480) (13 pp, sha256 `9ba79df1ac62551b`, retrieved 2026-10-09, tier: lcsc)
- **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/74hct126pw-datasheet.pdf)