# 74VHC240FT

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

74VHC240FT 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 3-state output enable for the first buffer group (1A1-1A4 to 1Y1-1Y4); inputs accept 0 to 5.5 V. |
| 2 | 1A1 | input | Buffer 1 data input A1, inverted to 1Y1; accepts 0 to 5.5 V regardless of VCC. |
| 3 | 2Y4 | tri_state | Inverting 3-state output of group 2, channel 4 (from 2A4), high-impedance when 2G is high. |
| 4 | 1A2 | input | Buffer 1 data input A2, inverted to 1Y2; accepts 0 to 5.5 V regardless of VCC. |
| 5 | 2Y3 | tri_state | Inverting 3-state output of group 2, channel 3 (from 2A3), high-impedance when 2G is high. |
| 6 | 1A3 | input | Buffer 1 data input A3, inverted to 1Y3; accepts 0 to 5.5 V regardless of VCC. |
| 7 | 2Y2 | tri_state | Inverting 3-state output of group 2, channel 2 (from 2A2), high-impedance when 2G is high. |
| 8 | 1A4 | input | Buffer 1 data input A4, inverted to 1Y4; accepts 0 to 5.5 V regardless of VCC. |
| 9 | 2Y1 | tri_state | Inverting 3-state output of group 2, channel 1 (from 2A1), high-impedance when 2G is high. |
| 10 | GND | power_in | Ground reference (0 V). |
| 11 | 2A1 | input | Buffer 2 data input A1, inverted to 2Y1; accepts 0 to 5.5 V regardless of VCC. |
| 12 | 1Y4 | tri_state | Inverting 3-state output of group 1, channel 4 (from 1A4), high-impedance when 1G is high. |
| 13 | 2A2 | input | Buffer 2 data input A2, inverted to 2Y2; accepts 0 to 5.5 V regardless of VCC. |
| 14 | 1Y3 | tri_state | Inverting 3-state output of group 1, channel 3 (from 1A3), high-impedance when 1G is high. |
| 15 | 2A3 | input | Buffer 2 data input A3, inverted to 2Y3; accepts 0 to 5.5 V regardless of VCC. |
| 16 | 1Y2 | tri_state | Inverting 3-state output of group 1, channel 2 (from 1A2), high-impedance when 1G is high. |
| 17 | 2A4 | input | Buffer 2 data input A4, inverted to 2Y4; accepts 0 to 5.5 V regardless of VCC. |
| 18 | 1Y1 | tri_state | Inverting 3-state output of group 1, channel 1 (from 1A1), high-impedance when 1G is high. |
| 19 | 2G | input | Active-low 3-state output enable for the second buffer group (2A1-2A4 to 2Y1-2Y4); inputs accept 0 to 5.5 V. |
| 20 | VCC | power_in | Positive supply voltage, operating range 2.0 V 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 |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | 2 |  | 5.5 | V |  | 4 |
| Input voltage | VIN | 0 |  | 5.5 | V |  | 4 |
| Output voltage | VOUT | 0 |  |  | V |  | 4 |
| Operating temperature | Topr | -40 |  | 125 | °C |  | 4 |
| Input rise and fall times | dt/dv | 0 |  | 100 | ns/V | VCC = 3.3 ± 0.3 V | 4 |
| Input rise and fall times | dt/dv | 0 |  | 20 | ns/V | VCC = 5 ± 0.5 V | 4 |
| Supply voltage | VCC | -0.5 |  | 7 | V |  | 3 |
| Input voltage | VIN | -0.5 |  | 7 | V |  | 3 |
| Output voltage | VOUT | -0.5 |  |  | V |  | 3 |
| Input diode current | IIK | -20 |  |  | mA |  | 3 |
| Output diode current | IOK | -20 |  | 20 | mA |  | 3 |
| Output current | IOUT | -25 |  | 25 | mA |  | 3 |
| VCC/ground current | ICC | -75 |  | 75 | mA |  | 3 |
| Power dissipation | PD |  |  | 180 | mW | Ta = -40 to 85 °C | 3 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 3 |
| High-level input voltage | VIH | 1.5 |  |  | V | Ta = 25 °C; VCC = 2.0 V | 4 |
| Low-level input voltage | VIL |  |  | 0.5 | V | Ta = 25 °C; VCC = 2.0 V | 4 |
| High-level output voltage | VOH | 1.9 |  |  | V | Ta = 25 °C; VCC = 2.0 V; IOH = -50 µA | 4 |
| High-level output voltage | VOH | 2.9 |  |  | V | Ta = 25 °C; VCC = 3.0 V; IOH = -50 µA | 4 |
| High-level output voltage | VOH | 4.4 |  |  | V | Ta = 25 °C; VCC = 4.5 V; IOH = -50 µA | 4 |
| High-level output voltage | VOH | 2.58 |  |  | V | Ta = 25 °C; VCC = 3.0 V; IOH = -4 mA | 4 |
| High-level output voltage | VOH | 3.94 |  |  | V | Ta = 25 °C; VCC = 4.5 V; IOH = -8 mA | 4 |
| Low-level output voltage | VOL |  |  | 0.1 | V | Ta = 25 °C; VCC = 2.0 V; IOL = 50 µA | 4 |
| Low-level output voltage | VOL |  |  | 0.36 | V | Ta = 25 °C; VCC = 3.0 V; IOL = 4 mA | 4 |
| 3-state output OFF-state leakage current | IOZ | -0.25 |  | 0.25 | µA | Ta = 25 °C; VCC = 5.5 V; VOUT = VCC or GND | 4 |
| Input leakage current | IIN | -0.1 |  | 0.1 | µA | Ta = 25 °C; VIN = 5.5 V or GND | 4 |
| Quiescent supply current | ICC |  |  | 4 | µA | Ta = 25 °C; VCC = 5.5 V; VIN = VCC or GND | 4 |
| High-level input voltage | VIH | 1.5 |  |  | V | Ta = -40 to 85 °C; VCC = 2.0 V | 5 |
| Low-level input voltage | VIL |  |  | 0.5 | V | Ta = -40 to 85 °C; VCC = 2.0 V | 5 |
| High-level output voltage | VOH | 1.9 |  |  | V | Ta = -40 to 85 °C; VCC = 2.0 V; IOH = -50 µA | 5 |
| High-level output voltage | VOH | 2.9 |  |  | V | Ta = -40 to 85 °C; VCC = 3.0 V; IOH = -50 µA | 5 |
| High-level output voltage | VOH | 4.4 |  |  | V | Ta = -40 to 85 °C; VCC = 4.5 V; IOH = -50 µA | 5 |
| High-level output voltage | VOH | 2.48 |  |  | V | Ta = -40 to 85 °C; VCC = 3.0 V; IOH = -4 mA | 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 |  |  | 0.1 | V | Ta = -40 to 85 °C; VCC = 2.0 V; IOL = 50 µA | 5 |
| Low-level output voltage | VOL |  |  | 0.44 | V | Ta = -40 to 85 °C; VCC = 3.0 V; IOL = 4 mA | 5 |
| 3-state output OFF-state leakage current | IOZ | -2.5 |  | 2.5 | µA | Ta = -40 to 85 °C; VCC = 5.5 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; VCC = 5.5 V; VIN = VCC or GND | 5 |
| High-level output voltage | VOH | 2.4 |  |  | V | Ta = -40 to 125 °C; VCC = 3.0 V; IOH = -4 mA | 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 = 3.0 V; IOL = 4 mA | 5 |
| 3-state output OFF-state leakage current | IOZ | -10 |  | 10 | µA | Ta = -40 to 125 °C; VCC = 5.5 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; VCC = 5.5 V; VIN = VCC or GND | 5 |

## CAD (KiCad official)

- Symbol: `74VHC240FT`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `74vhc240ft-etched.step` / `74vhc240ft-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `74vhc240ft.step` / `74vhc240ft.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TOSHIBA datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588923367664078848) (9 pp, sha256 `4e8ede3bacb032e0`, retrieved 2026-10-17, tier: lcsc)
- **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/74vhc240ft-datasheet.pdf)