# SN74AHCT126QPWRQ1

**Texas Instruments** · Buffers, Drivers, Receivers, Transceivers · TSSOP-14

SN74AHCT126QPWRQ1 from Texas Instruments, 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 | Output enable input for buffer 1; high enables output to follow data input, low places output in high-impedance state. |
| 2 | 1A | input | Data input for buffer 1; logic level transferred to 1Y output when 1OE is high. |
| 3 | 1Y | tri_state | Tristate output for buffer 1; passes 1A input when 1OE is high, high-impedance when low. |
| 4 | 2OE | input | Output enable input for buffer 2; high enables output to follow data input, low places output in high-impedance state. |
| 5 | 2A | input | Data input for buffer 2; logic level transferred to 2Y output when 2OE is high. |
| 6 | 2Y | tri_state | Tristate output for buffer 2; passes 2A input when 2OE is high, high-impedance when low. |
| 7 | GND | power_in | Ground, 0V reference. |
| 8 | 3Y | tri_state | Tristate output for buffer 3; passes 3A input when 3OE is high, high-impedance when low. |
| 9 | 3A | input | Data input for buffer 3; logic level transferred to 3Y output when 3OE is high. |
| 10 | 3OE | input | Output enable input for buffer 3; high enables output to follow data input, low places output in high-impedance state. |
| 11 | 4Y | tri_state | Tristate output for buffer 4; passes 4A input when 4OE is high, high-impedance when low. |
| 12 | 4A | input | Data input for buffer 4; logic level transferred to 4Y output when 4OE is high. |
| 13 | 4OE | input | Output enable input for buffer 4; high enables output to follow data input, low places output in high-impedance state. |
| 14 | VCC | power_in | Power supply voltage; recommended operating range 4.5V to 5.5V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-14 |
| Category | Logic |
| Pins | 14 |

## CAD (KiCad official)

- Symbol: `SN74AHCT126QPWRQ1`
- Footprint: `Package_SO:TSSOP-14_4.4x5mm_P0.65mm`
- 3D model: TSSOP-14 (KiCad packages3D, STEP)
- 3D model files: `sn74ahct126qpwrq1-etched.step` / `sn74ahct126qpwrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ahct126qpwrq1.step` / `sn74ahct126qpwrq1.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/cn/lit/gpn/sn74ahct126-q1) (30 pp, sha256 `7161780ff9b93586`, retrieved 2026-09-26, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/sn74ahct126qpwrq1-datasheet.pdf)