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74VHCT240AFT
Public Made by Adomby adom
TOSHIBA Buffers, Drivers, Receivers, Transceivers, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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Symbol & Footprint
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README
markdown74VHCT240AFT
TOSHIBA · Buffers, Drivers, Receivers, Transceivers · TSSOP-20
74VHCT240AFT 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 0 to 5.5 V, VIH 2.0 V min, VIL 0.8 V max. |
| 2 | 1A1 | input | Data input 1A1 of group 1, inverted to output 1Y1; TTL-compatible with VIH 2.0 V min and VIL 0.8 V max. |
| 3 | 2Y4 | tri_state | Inverting 3-state output of group 2 driven from 2A4; high impedance when 2G is high. |
| 4 | 1A2 | input | Data input 1A2 of group 1, inverted to output 1Y2; TTL-compatible with VIH 2.0 V min and VIL 0.8 V max. |
| 5 | 2Y3 | tri_state | Inverting 3-state output of group 2 driven from 2A3; high impedance when 2G is high. |
| 6 | 1A3 | input | Data input 1A3 of group 1, inverted to output 1Y3; TTL-compatible with VIH 2.0 V min and VIL 0.8 V max. |
| 7 | 2Y2 | tri_state | Inverting 3-state output of group 2 driven from 2A2; high impedance when 2G is high. |
| 8 | 1A4 | input | Data input 1A4 of group 1, inverted to output 1Y4; TTL-compatible with VIH 2.0 V min and VIL 0.8 V max. |
| 9 | 2Y1 | tri_state | Inverting 3-state output of group 2 driven from 2A1; high impedance when 2G is high. |
| 10 | GND | power_in | Ground pin (0 V). |
| 11 | 2A1 | input | Data input 2A1 of group 2, inverted to output 2Y1; TTL-compatible with VIH 2.0 V min and VIL 0.8 V max. |
| 12 | 1Y4 | tri_state | Inverting 3-state output of group 1 driven from 1A4; high impedance when 1G is high. |
| 13 | 2A2 | input | Data input 2A2 of group 2, inverted to output 2Y2; TTL-compatible with VIH 2.0 V min and VIL 0.8 V max. |
| 14 | 1Y3 | tri_state | Inverting 3-state output of group 1 driven from 1A3; high impedance when 1G is high. |
| 15 | 2A3 | input | Data input 2A3 of group 2, inverted to output 2Y3; TTL-compatible with VIH 2.0 V min and VIL 0.8 V max. |
| 16 | 1Y2 | tri_state | Inverting 3-state output of group 1 driven from 1A2; high impedance when 1G is high. |
| 17 | 2A4 | input | Data input 2A4 of group 2, inverted to output 2Y4; TTL-compatible with VIH 2.0 V min and VIL 0.8 V max. |
| 18 | 1Y1 | tri_state | Inverting 3-state output of group 1 driven 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 0 to 5.5 V, VIH 2.0 V min, VIL 0.8 V max. |
| 20 | VCC | power_in | Supply voltage pin, operating range 4.5 to 5.5 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 | VCC = 4.5 to 5.5 V, Ta = 25 C | 5 | ||
| Low-level input voltage | VIL | 0.8 | V | VCC = 4.5 to 5.5 V, Ta = 25 C | 5 | ||
| High-level output voltage | VOH | 4.4 | 4.5 | V | VIN = VIH or VIL, IOH = -50 uA, VCC = 4.5 V, Ta = 25 C | 5 | |
| High-level output voltage | VOH | 3.94 | V | VIN = VIH or VIL, IOH = -8 mA, VCC = 4.5 V, Ta = 25 C | 5 | ||
| Low-level output voltage | VOL | 0 | 0.1 | V | VIN = VIH or VIL, IOL = 50 uA, VCC = 4.5 V, Ta = 25 C | 5 | |
| Low-level output voltage | VOL | 0.36 | V | VIN = VIH or VIL, IOL = 8 mA, VCC = 4.5 V, Ta = 25 C | 5 | ||
| 3-state output OFF-state leakage current | IOZ | -0.25 | 0.25 | uA | VIN = VIH or VIL, VOUT = VCC or GND, Ta = 25 C | 5 | |
| Input leakage current | IIN | -0.1 | 0.1 | uA | VIN = 5.5 V or GND, Ta = 25 C | 5 | |
| Quiescent supply current | ICC | 4 | uA | VIN = VCC or GND, Ta = 25 C | 5 | ||
| Quiescent supply current (per input) | ICCT | 1.35 | mA | Per input: VIN = 3.4 V, other input VCC or GND, Ta = 25 C | 5 | ||
| Output leakage current (Power-OFF) | IOPD | 0.5 | uA | VOUT = 5.5 V, Ta = 25 C | 5 | ||
| High-level output voltage | VOH | 4.4 | V | VIN = VIH or VIL, IOH = -50 uA, VCC = 4.5 V, Ta = -40 to 85 C | 5 | ||
| High-level output voltage | VOH | 3.8 | V | VIN = VIH or VIL, IOH = -8 mA, VCC = 4.5 V, Ta = -40 to 85 C | 5 | ||
| Low-level output voltage | VOL | 0.1 | V | VIN = VIH or VIL, IOL = 50 uA, VCC = 4.5 V, Ta = -40 to 85 C | 5 | ||
| Low-level output voltage | VOL | 0.44 | V | VIN = VIH or VIL, IOL = 8 mA, VCC = 4.5 V, Ta = -40 to 85 C | 5 | ||
| 3-state output OFF-state leakage current | IOZ | -2.5 | 2.5 | uA | VIN = VIH or VIL, VOUT = VCC or GND, Ta = -40 to 85 C | 5 | |
| Input leakage current | IIN | -1 | 1 | uA | VIN = 5.5 V or GND, Ta = -40 to 85 C | 5 | |
| Quiescent supply current | ICC | 40 | uA | VIN = VCC or GND, Ta = -40 to 85 C | 5 | ||
| Quiescent supply current (per input) | ICCT | 1.5 | mA | Per input: VIN = 3.4 V, other input VCC or GND, Ta = -40 to 85 C | 5 | ||
| Output leakage current (Power-OFF) | IOPD | 5 | uA | VOUT = 5.5 V, Ta = -40 to 85 C | 5 | ||
| High-level output voltage | VOH | 3.7 | V | VIN = VIH or VIL, IOH = -8 mA, VCC = 4.5 V, Ta = -40 to 125 C | 5 | ||
| Low-level output voltage | VOL | 0.55 | V | VIN = VIH or VIL, IOL = 8 mA, VCC = 4.5 V, Ta = -40 to 125 C | 5 | ||
| 3-state output OFF-state leakage current | IOZ | -10 | 10 | uA | VIN = VIH or VIL, VOUT = VCC or GND, Ta = -40 to 125 C | 5 | |
| Input leakage current | IIN | -2 | 2 | uA | VIN = 5.5 V or GND, Ta = -40 to 125 C | 5 | |
| Quiescent supply current | ICC | 80 | uA | VIN = VCC or GND, Ta = -40 to 125 C | 5 | ||
| Output leakage current (Power-OFF) | IOPD | 20 | uA | VOUT = 5.5 V, Ta = -40 to 125 C | 5 | ||
| Propagation delay time (74VHCT240AFT) | tPLH,tPHL | 5.6 | 7.8 | ns | Ta = 25 C, VCC = 5.0 +/- 0.5 V, CL = 15 pF, RL = 1 kOhm | 6 | |
| Propagation delay time (74VHCT240AFT) | tPLH,tPHL | 6.1 | 8.8 | ns | Ta = 25 C, VCC = 5.0 +/- 0.5 V, CL = 50 pF, RL = 1 kOhm | 6 | |
| Propagation delay time (74VHCT240AFT) | tPLH,tPHL | 1 | 9 | ns | Ta = -40 to 85 C, VCC = 5.0 +/- 0.5 V, CL = 15 pF, RL = 1 kOhm | 6 | |
| Propagation delay time (74VHCT240AFT) | tPLH,tPHL | 1 | 10 | ns | Ta = -40 to 85 C, VCC = 5.0 +/- 0.5 V, CL = 50 pF, RL = 1 kOhm | 6 | |
| Propagation delay time (74VHCT240AFT) | tPLH,tPHL | 1 | 11 | ns | Ta = -40 to 125 C, VCC = 5.0 +/- 0.5 V, CL = 50 pF, RL = 1 kOhm | 6 | |
| Input capacitance | CIN | 10 | pF | VCC = 5.0 +/- 0.5 V, Ta = -40 to 85 C | 6 | ||
| Supply voltage | VCC | -0.5 | 7 | V | 4 | ||
| Input voltage | VIN | -0.5 | 7 | V | 4 | ||
| Output voltage | VOUT | -0.5 | 7 | V | Output in off-state (Note 1); VOUT < GND or VOUT > VCC (Note 3) | 4 | |
| Input diode current | IIK | -20 | mA | 4 | |||
| Output diode current | IOK | -20 | 20 | mA | 4 | ||
| Output current | IOUT | -25 | 25 | mA | High (H) or Low (L) state (Note 2) | 4 | |
| VCC/ground current | ICC | -75 | 75 | mA | 4 | ||
| Power dissipation | PD | 180 | mW | Ta = -40 to 85 C (Note 4) | 4 | ||
| Storage temperature | Tstg | -65 | 150 | C | 4 | ||
| Supply voltage | VCC | 4.5 | 5.5 | V | 4 | ||
| Input voltage | VIN | 0 | 5.5 | V | 4 | ||
| Output voltage | VOUT | 0 | 5.5 | V | Output in OFF state (Note 1) | 4 | |
| Output voltage | VOUT | 0 | V | Output High or Low state (Note 2); upper limit VCC | 4 | ||
| Operating temperature | Topr | -40 | 125 | C | 4 | ||
| Input rise and fall times | dt/dv | 0 | 20 | ns/V | 4 |
CAD (KiCad official)
- Symbol:
74VHCT240AFT - Footprint:
Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm - 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files:
74vhct240aft-etched.step/74vhct240aft-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);74vhct240aft.step/74vhct240aft.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: TOSHIBA datasheet (9 pp, sha256
3e200ea129a9f3ca, retrieved 2026-10-18, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).