# SN74HC244QPWREP

**Texas Instruments** · Buffers, Drivers, Receivers, Transceivers · TSSOP-20

SN74HC244QPWREP from Texas Instruments, in a TSSOP-20. 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 | Active-low output enable for the first 4-bit buffer/driver: when low, data passes from the 1A inputs to the 1Y outputs, and when high, the 1Y outputs go to high impedance. |
| 2 | 1A1 | input | Noninverted data input 1 of the first buffer/driver, with input voltage limited to 0 V to VCC. |
| 3 | 2Y4 | tri_state | 3-state output 4 of the second buffer/driver, high impedance when 2OE is high, and rated to drive up to 15 LSTTL loads. |
| 4 | 1A2 | input | Noninverted data input 2 of the first buffer/driver, with input voltage limited to 0 V to VCC. |
| 5 | 2Y3 | tri_state | 3-state output 3 of the second buffer/driver, high impedance when 2OE is high, and rated to drive up to 15 LSTTL loads. |
| 6 | 1A3 | input | Noninverted data input 3 of the first buffer/driver, with input voltage limited to 0 V to VCC. |
| 7 | 2Y2 | tri_state | 3-state output 2 of the second buffer/driver, high impedance when 2OE is high, and rated to drive up to 15 LSTTL loads. |
| 8 | 1A4 | input | Noninverted data input 4 of the first buffer/driver, with input voltage limited to 0 V to VCC. |
| 9 | 2Y1 | tri_state | 3-state output 1 of the second buffer/driver, high impedance when 2OE is high, and rated to drive up to 15 LSTTL loads. |
| 10 | GND | power_in | Ground reference for the device. |
| 11 | 2A1 | input | Noninverted data input 1 of the second buffer/driver, with input voltage limited to 0 V to VCC. |
| 12 | 1Y4 | tri_state | 3-state output 4 of the first buffer/driver, high impedance when 1OE is high, and rated to drive up to 15 LSTTL loads. |
| 13 | 2A2 | input | Noninverted data input 2 of the second buffer/driver, with input voltage limited to 0 V to VCC. |
| 14 | 1Y3 | tri_state | 3-state output 3 of the first buffer/driver, high impedance when 1OE is high, and rated to drive up to 15 LSTTL loads. |
| 15 | 2A3 | input | Noninverted data input 3 of the second buffer/driver, with input voltage limited to 0 V to VCC. |
| 16 | 1Y2 | tri_state | 3-state output 2 of the first buffer/driver, high impedance when 1OE is high, and rated to drive up to 15 LSTTL loads. |
| 17 | 2A4 | input | Noninverted data input 4 of the second buffer/driver, with input voltage limited to 0 V to VCC. |
| 18 | 1Y1 | tri_state | 3-state output 1 of the first buffer/driver, high impedance when 1OE is high, and rated to drive up to 15 LSTTL loads. |
| 19 | 2OE | input | Active-low output enable for the second 4-bit buffer/driver: when low, data passes from the 2A inputs to the 2Y outputs, and when high, the 2Y outputs go to high impedance. |
| 20 | VCC | power_in | Supply voltage, recommended range 2 V to 6 V with an absolute maximum of 7 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-20 |
| Category | Logic |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `SN74HC244QPWREP`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `sn74hc244qpwrep-etched.step` / `sn74hc244qpwrep-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74hc244qpwrep.step` / `sn74hc244qpwrep.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/sn74hc244-ep) (16 pp, sha256 `e209190dd4fa799c`, retrieved 2026-10-10, 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/sn74hc244qpwrep-datasheet.pdf)