# 74VHCT244AFT

**TOSHIBA** · Buffers, Drivers, Receivers, Transceivers · TSSOP-20

74VHCT244AFT from TOSHIBA, 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 | 1G | input | Active-low output enable for buffer group 1 (1A1-1A4 to 1Y1-1Y4); outputs are high-impedance when high. |
| 2 | 1A1 | input | Data input 1 of group 1; 0 to 5.5 V input range, TTL-compatible (VIL 0.8 V max, VIH 2.0 V min). |
| 3 | 2Y4 | tri_state | Non-inverted 3-state output 4 of group 2, follows 2A4 when 2G is low. |
| 4 | 1A2 | input | Data input 2 of group 1; 0 to 5.5 V input range, TTL-compatible. |
| 5 | 2Y3 | tri_state | Non-inverted 3-state output 3 of group 2, follows 2A3 when 2G is low. |
| 6 | 1A3 | input | Data input 3 of group 1; 0 to 5.5 V input range, TTL-compatible. |
| 7 | 2Y2 | tri_state | Non-inverted 3-state output 2 of group 2, follows 2A2 when 2G is low. |
| 8 | 1A4 | input | Data input 4 of group 1; 0 to 5.5 V input range, TTL-compatible. |
| 9 | 2Y1 | tri_state | Non-inverted 3-state output 1 of group 2, follows 2A1 when 2G is low. |
| 10 | GND | power_in | Ground (0 V) supply pin. |
| 11 | 2A1 | input | Data input 1 of group 2; 0 to 5.5 V input range, TTL-compatible. |
| 12 | 1Y4 | tri_state | Non-inverted 3-state output 4 of group 1, follows 1A4 when 1G is low. |
| 13 | 2A2 | input | Data input 2 of group 2; 0 to 5.5 V input range, TTL-compatible. |
| 14 | 1Y3 | tri_state | Non-inverted 3-state output 3 of group 1, follows 1A3 when 1G is low. |
| 15 | 2A3 | input | Data input 3 of group 2; 0 to 5.5 V input range, TTL-compatible. |
| 16 | 1Y2 | tri_state | Non-inverted 3-state output 2 of group 1, follows 1A2 when 1G is low. |
| 17 | 2A4 | input | Data input 4 of group 2; 0 to 5.5 V input range, TTL-compatible. |
| 18 | 1Y1 | tri_state | Non-inverted 3-state output 1 of group 1, follows 1A1 when 1G is low. |
| 19 | 2G | input | Active-low output enable for buffer group 2 (2A1-2A4 to 2Y1-2Y4); outputs are high-impedance when high. |
| 20 | VCC | power_in | Positive supply voltage, operating range 4.5 to 5.5 V (absolute maximum -0.5 to 7.0 V). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TOSHIBA |
| 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 input voltage | VIH | 2 |  |  | V | Ta = 25 °C; VCC 4.5 to 5.5 V | 5 |
| Low-level input voltage | VIL |  |  | 0.8 | V | Ta = 25 °C; VCC 4.5 to 5.5 V | 5 |
| High-level output voltage | VOH | 4.4 |  |  | V | Ta = 25 °C; VCC 4.5 V; IOH = -50 µA | 5 |
| High-level output voltage | VOH | 3.94 |  |  | V | Ta = 25 °C; VCC 4.5 V; IOH = -8 mA | 5 |
| Low-level output voltage | VOL |  |  | 0.1 | V | Ta = 25 °C; VCC 4.5 V; IOL = 50 µA | 5 |
| Low-level output voltage | VOL |  |  | 0.36 | V | Ta = 25 °C; VCC 4.5 V; IOL = 8 mA | 5 |
| 3-state output OFF-state leakage current | IOZ | -0.25 |  | 0.25 | µA | Ta = 25 °C; VCC 4.5 V; VOUT = VCC or GND | 5 |
| Input leakage current | IIN | -0.1 |  | 0.1 | µA | Ta = 25 °C; VIN = 5.5 V or GND | 5 |
| Quiescent supply current | ICC |  |  | 4 | µA | Ta = 25 °C; VIN = VCC or GND | 5 |
| Quiescent supply current (per input VIN = 3.4 V) | ICCT |  |  | 1.35 | mA | Ta = 25 °C; per input VIN = 3.4 V; other input VCC or GND | 5 |
| Output leakage current (Power-OFF) | IOPD |  |  | 0.5 | µA | Ta = 25 °C; VOUT = 5.5 V | 5 |
| High-level output voltage | VOH | 3.8 |  |  | V | Ta = -40 to 85 °C; VCC 4.5 V; IOH = -8 mA | 5 |
| Low-level output voltage | VOL |  |  | 0.44 | V | Ta = -40 to 85 °C; VCC 4.5 V; IOL = 8 mA | 5 |
| 3-state output OFF-state leakage current | IOZ | -2.5 |  | 2.5 | µA | Ta = -40 to 85 °C; VCC 4.5 V; VOUT = VCC or GND | 5 |
| Input leakage current | IIN | -1 |  | 1 | µA | Ta = -40 to 85 °C; VIN = 5.5 V or GND | 5 |
| Quiescent supply current | ICC |  |  | 40 | µA | Ta = -40 to 85 °C; VIN = VCC or GND | 5 |
| Quiescent supply current (per input VIN = 3.4 V) | ICCT |  |  | 1.5 | mA | Ta = -40 to 85 °C; per input VIN = 3.4 V; other input VCC or GND | 5 |
| Output leakage current (Power-OFF) | IOPD |  |  | 5 | µA | Ta = -40 to 85 °C; VOUT = 5.5 V | 5 |
| High-level output voltage | VOH | 3.7 |  |  | V | Ta = -40 to 125 °C; VCC 4.5 V; IOH = -8 mA | 5 |
| Low-level output voltage | VOL |  |  | 0.55 | V | Ta = -40 to 125 °C; VCC 4.5 V; IOL = 8 mA | 5 |
| 3-state output OFF-state leakage current | IOZ | -10 |  | 10 | µA | Ta = -40 to 125 °C; VCC 4.5 V; VOUT = VCC or GND | 5 |
| Input leakage current | IIN | -2 |  | 2 | µA | Ta = -40 to 125 °C; VIN = 5.5 V or GND | 5 |
| Quiescent supply current | ICC |  |  | 80 | µA | Ta = -40 to 125 °C; VIN = VCC or GND | 5 |
| Output leakage current (Power-OFF) | IOPD |  |  | 20 | µA | Ta = -40 to 125 °C; VOUT = 5.5 V | 5 |
| Quiet output maximum dynamic VOL | VOLP |  | 0.8 | 1 | V | VCC 5.0 V; CL = 50 pF; Ta = 25 °C; tr = tf = 3 ns | 7 |
| Quiet output minimum dynamic VOL | VOLV | -1 | -0.8 |  | V | VCC 5.0 V; CL = 50 pF; Ta = 25 °C; tr = tf = 3 ns | 7 |
| Minimum high-level dynamic input voltage | VIHD | 2 |  |  | V | VCC 5.0 V; CL = 50 pF; Ta = 25 °C; tr = tf = 3 ns | 7 |
| Maximum low-level dynamic input voltage | VILD |  |  | 0.8 | V | VCC 5.0 V; CL = 50 pF; Ta = 25 °C; tr = tf = 3 ns | 7 |
| Supply voltage (absolute maximum) | VCC | -0.5 |  | 7 | V |  | 4 |
| Input voltage (absolute maximum) | VIN | -0.5 |  | 7 | V |  | 4 |
| Output voltage (absolute maximum) | VOUT | -0.5 |  | 7 | V | Output in off-state (Note 1) | 4 |
| Input diode current | IIK | -20 |  |  | mA |  | 4 |
| Output diode current | IOK | -20 |  | 20 | mA |  | 4 |
| Output current | IOUT | -25 |  | 25 | mA |  | 4 |
| VCC/ground current | ICC | -75 |  | 75 | mA |  | 4 |
| Power dissipation | PD |  |  | 180 | mW | Ta = -40 to 85 °C; derate -3.25 mW/°C from 85 to 125 °C until 50 mW | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Supply voltage (recommended operating) | VCC | 4.5 |  | 5.5 | V |  | 4 |
| Input voltage (recommended operating) | VIN | 0 |  | 5.5 | V |  | 4 |
| Output voltage (recommended operating) | VOUT | 0 |  | 5.5 | V | Output in OFF state (Note 1) | 4 |
| Operating temperature | Topr | -40 |  | 125 | °C |  | 4 |
| Input rise and fall times | dt/dv | 0 |  | 20 | ns/V |  | 4 |

## CAD (KiCad official)

- Symbol: `74VHCT244AFT`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `74vhct244aft-etched.step` / `74vhct244aft-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `74vhct244aft.step` / `74vhct244aft.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TOSHIBA datasheet](docs/74vhct244aft-datasheet.pdf) (9 pp, sha256 `7a75476edf75dfaa`, retrieved 2026-10-21, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/74vhct244aft-datasheet.pdf)