# CAHCT126QPWRG4Q1

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

CAHCT126QPWRG4Q1 from Texas Instruments, in a TSSOP-14. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | 1OE | input | Output-enable input for buffer 1. When 1OE is high, the buffer passes 1A to 1Y; when low, 1Y is placed in the high-impedance (Hi-Z) state. TTL-compatible input; VIH ≥ 2 V, VIL ≤ 0.8 V. |
| 2 | 1A | input | Data input to buffer 1. Driven through the 3-state buffer to output 1Y when 1OE is high. TTL-compatible input; VIH ≥ 2 V, VIL ≤ 0.8 V, VI range 0-5.5 V. |
| 3 | 1Y | tri_state | 3-state output of buffer 1. Drives the buffered value of 1A when 1OE is high; Hi-Z when 1OE is low. Guaranteed drive is ±8 mA at VCC = 5 V (VOH ≥ 3.94 V, VOL ≤ 0.36 V). |
| 4 | 2OE | input | Output-enable input for buffer 2. When 2OE is high, the buffer passes 2A to 2Y; when low, 2Y is Hi-Z. TTL-compatible input; VIH ≥ 2 V, VIL ≤ 0.8 V. |
| 5 | 2A | input | Data input to buffer 2. Driven through the 3-state buffer to output 2Y when 2OE is high. TTL-compatible input; VIH ≥ 2 V, VIL ≤ 0.8 V, VI range 0-5.5 V. |
| 6 | 2Y | tri_state | 3-state output of buffer 2. Drives the buffered value of 2A when 2OE is high; Hi-Z when 2OE is low. Guaranteed drive is ±8 mA at VCC = 5 V. |
| 7 | GND | power_in | Ground reference for the device. Connect to the system ground plane; a local decoupling capacitor from VCC to GND is recommended. |
| 8 | 3Y | tri_state | 3-state output of buffer 3. Drives the buffered value of 3A when 3OE is high; Hi-Z when 3OE is low. Guaranteed drive is ±8 mA at VCC = 5 V. |
| 9 | 3A | input | Data input to buffer 3. Driven through the 3-state buffer to output 3Y when 3OE is high. TTL-compatible input; VIH ≥ 2 V, VIL ≤ 0.8 V, VI range 0-5.5 V. |
| 10 | 3OE | input | Output-enable input for buffer 3. When 3OE is high, the buffer passes 3A to 3Y; when low, 3Y is Hi-Z. TTL-compatible input; VIH ≥ 2 V, VIL ≤ 0.8 V. |
| 11 | 4Y | tri_state | 3-state output of buffer 4. Drives the buffered value of 4A when 4OE is high; Hi-Z when 4OE is low. Guaranteed drive is ±8 mA at VCC = 5 V. |
| 12 | 4A | input | Data input to buffer 4. Driven through the 3-state buffer to output 4Y when 4OE is high. TTL-compatible input; VIH ≥ 2 V, VIL ≤ 0.8 V, VI range 0-5.5 V. |
| 13 | 4OE | input | Output-enable input for buffer 4. When 4OE is high, the buffer passes 4A to 4Y; when low, 4Y is Hi-Z. TTL-compatible input; VIH ≥ 2 V, VIL ≤ 0.8 V. |
| 14 | VCC | power_in | Positive supply input. Operating range 4.5 V to 5.5 V; absolute maximum 7 V. Decouple to GND with a local ceramic capacitor (e.g. 100 nF) near the pin. |

## Key specifications

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

## Ordering variants

Same part, different packaging or reel option.

- `CAHCT126QPWRG4Q1`
- `CAHCT126QPWRG4Q1D`
- `CAHCT126QPWRG4Q1DR`
- `CAHCT126QPWRG4Q1BQA`

## CAD (KiCad official)

- Symbol: `CAHCT126QPWRG4Q1`
- Footprint: `Package_SO:TSSOP-14_4.4x5mm_P0.65mm`
- 3D model: TSSOP-14 (KiCad packages3D, STEP)
- 3D model files: `cahct126qpwrg4q1-etched.step` / `cahct126qpwrg4q1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cahct126qpwrg4q1.step` / `cahct126qpwrg4q1.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) (None pp, sha256 `7161780ff9b93586`, retrieved 2026-08-17, 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:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/cahct126qpwrg4q1-datasheet.pdf)