# SN74AHCT244QPWR

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

SN74AHCT244QPWR 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 | Bank 1 output enable, active low; when OE is high the Bank 1 outputs are in the high-impedance state. |
| 2 | 1A1 | input | Bank 1 channel 1 data input, passed to output 1Y1 when 1OE is low. |
| 3 | 2Y4 | output | Bank 2 channel 4 3-state output, active when 2OE is low. |
| 4 | 1A2 | input | Bank 1 channel 2 data input, passed to output 1Y2 when 1OE is low. |
| 5 | 2Y3 | output | Bank 2 channel 3 3-state output, active when 2OE is low. |
| 6 | 1A3 | input | Bank 1 channel 3 data input, passed to output 1Y3 when 1OE is low. |
| 7 | 2Y2 | output | Bank 2 channel 2 3-state output, active when 2OE is low. |
| 8 | 1A4 | input | Bank 1 channel 4 data input, passed to output 1Y4 when 1OE is low. |
| 9 | 2Y1 | output | Bank 2 channel 1 3-state output, active when 2OE is low. |
| 10 | GND | power_in | Ground reference for the device. |
| 11 | 2A1 | input | Bank 2 channel 1 data input, passed to output 2Y1 when 2OE is low. |
| 12 | 1Y4 | output | Bank 1 channel 4 3-state output, active when 1OE is low. |
| 13 | 2A2 | input | Bank 2 channel 2 data input, passed to output 2Y2 when 2OE is low. |
| 14 | 1Y3 | output | Bank 1 channel 3 3-state output, active when 1OE is low. |
| 15 | 2A3 | input | Bank 2 channel 3 data input, passed to output 2Y3 when 2OE is low. |
| 16 | 1Y2 | output | Bank 1 channel 2 3-state output, active when 1OE is low. |
| 17 | 2A4 | input | Bank 2 channel 4 data input, passed to output 2Y4 when 2OE is low. |
| 18 | 1Y1 | output | Bank 1 channel 1 3-state output, active when 1OE is low. |
| 19 | 2OE | input | Bank 2 output enable, active low; when OE is high the Bank 2 outputs are in the high-impedance state. |
| 20 | VCC | power_in | Positive supply; recommended range 4.5 V to 5.5 V. |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| High-level output voltage | VOH | 4.4 |  |  | V | IOH = -50 μA, VCC 4.5 V | 5 |
| High-level output voltage | VOH | 3.8 |  |  | V | IOH = -8 mA, VCC 4.5 V | 5 |
| Low-level output voltage | VOL |  |  | 0.1 | V | IOL = 50 μA, VCC 4.5 V | 5 |
| Low-level output voltage | VOL |  |  | 0.44 | V | IOL = 8 mA, VCC 4.5 V | 5 |
| Off-state output current | IOZ | -2.5 |  | 2.5 | μA | VO = VCC or GND, VCC 5.5 V | 5 |
| Input current | II | -1 |  | 1 | μA | VI = 5.5 V or GND, 0 V to 5.5 V | 5 |
| Quiescent supply current | ICC |  | 4 | 40 | μA | VI = VCC or GND, IO = 0, VCC 5.5 V | 5 |
| Additional supply current per input | ΔICC |  | 1.35 | 1.5 | mA | One input at 3.4 V, other inputs at VCC or GND, VCC 5.5 V | 5 |
| Input capacitance | Ci |  | 2.5 | 10 | pF | VI = VCC or GND, 5 V | 5 |
| Supply voltage | VCC | 4.5 |  | 5.5 | V |  | 4 |
| High-level input voltage | VIH | 2 |  |  | V |  | 4 |
| Low-level input voltage | VIL |  |  | 0.8 | V |  | 4 |
| Input voltage | VI | 0 |  | 5.5 | V |  | 4 |
| Output voltage | VO | 0 |  |  | V | Maximum VCC | 4 |
| High-level output current | IOH |  |  | -8 | mA |  | 4 |
| Low-level output current | IOL |  |  | 8 | mA |  | 4 |
| Operating free-air temperature | TA | -40 |  | 125 | °C |  | 4 |
| Supply voltage range | VCC | -0.5 |  | 7 | V |  | 4 |
| Input voltage range | VI | -0.5 |  | 7 | V |  | 4 |
| Output voltage range | VO | -0.5 |  |  | V | VCC + 0.5 V maximum | 4 |
| Input clamp current | IIK | -20 |  |  | mA | VI < 0 | 4 |
| Output clamp current | IOK | -20 |  | 20 | mA | VO < 0 or VO > VCC | 4 |
| Continuous output current | IO | -25 |  | 25 | mA | VO = 0 to VCC | 4 |
| Continuous current through VCC or GND |  | -75 |  | 75 | mA |  | 4 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 4 |
| Junction-to-ambient thermal resistance | RθJA |  | 83 |  | °C/W | PW (TSSOP) 20 pins | 4 |

## CAD (KiCad official)

- Symbol: `SN74AHCT244QPWR`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `sn74ahct244qpwr-etched.step` / `sn74ahct244qpwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ahct244qpwr.step` / `sn74ahct244qpwr.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/sn74ahct244q.pdf) (19 pp, sha256 `5e8b9d71866b4d20`, retrieved 2026-11-05, 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/sn74ahct244qpwr-datasheet.pdf)