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74VHCT540AFT

Public Made by Adom

by 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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74VHCT540AFT

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

74VHCT540AFT 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 G1 input Active-low output enable 1; when G1 or G2 is high the outputs are in the high-impedance state.
2 A1 input Data input 1; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V.
3 A2 input Data input 2; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V.
4 A3 input Data input 3; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V.
5 A4 input Data input 4; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V.
6 A5 input Data input 5; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V.
7 A6 input Data input 6; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V.
8 A7 input Data input 7; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V.
9 A8 input Data input 8; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V.
10 GND power_in Ground (0 V) reference.
11 Y8 tri_state Inverted 3-state output 8 (inverse of A8); high-impedance when G1 or G2 is high.
12 Y7 tri_state Inverted 3-state output 7 (inverse of A7); high-impedance when G1 or G2 is high.
13 Y6 tri_state Inverted 3-state output 6 (inverse of A6); high-impedance when G1 or G2 is high.
14 Y5 tri_state Inverted 3-state output 5 (inverse of A5); high-impedance when G1 or G2 is high.
15 Y4 tri_state Inverted 3-state output 4 (inverse of A4); high-impedance when G1 or G2 is high.
16 Y3 tri_state Inverted 3-state output 3 (inverse of A3); high-impedance when G1 or G2 is high.
17 Y2 tri_state Inverted 3-state output 2 (inverse of A2); high-impedance when G1 or G2 is high.
18 Y1 tri_state Inverted 3-state output 1 (inverse of A1); high-impedance when G1 or G2 is high.
19 G2 input Active-low output enable 2; when G1 or G2 is high the outputs are in the high-impedance state.
20 VCC power_in Supply voltage, 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
Input voltage (absolute max) VIN -0.5 7 V 3
Supply voltage (absolute max) VCC -0.5 7 V 3
Output voltage (absolute max) VOUT -0.5 7 V Output in OFF state (Note1) 3
Output voltage (absolute max) VOUT -0.5 V High or Low state (Note2); upper limit printed as VCC + 0.5 3
Input diode current IIK -20 mA Printed as single value -20 3
Output diode current IOK -20 20 mA VOUT < GND, VOUT > VCC (Note3) 3
Output current IOUT -25 25 mA High or Low state (Note2) 3
VCC/ground current ICC -75 75 mA 3
Power dissipation PD 180 mW Ta = -40 to 85°C; derate -3.25 mW/°C from 85 to 125°C until 50 mW (Note4) 3
Storage temperature Tstg -65 150 °C 3
Supply voltage (operating) VCC 4.5 5.5 V 4
Input voltage (operating) VIN 0 5.5 V 4
Output voltage (operating) VOUT 0 5.5 V Output in OFF state (Note1) 4
Output voltage (operating) VOUT 0 V High or Low state (Note2); upper limit printed as VCC 4
Operating temperature Topr -40 125 °C 4
Input rise and fall times dt/dv 0 20 ns/V 4
High-level input voltage VIH 2 V Ta = 25°C; VCC = 4.5 to 5.5 V 4
Low-level input voltage VIL 0.8 V Ta = 25°C; VCC = 4.5 to 5.5 V 4
High-level output voltage VOH 4.4 4.5 V Ta = 25°C; VIN = VIH or VIL; IOH = -50 µA; VCC = 4.5 V 4
High-level output voltage VOH 3.94 V Ta = 25°C; VIN = VIH or VIL; IOH = -8 mA; VCC = 4.5 V 4
Low-level output voltage VOL 0 0.1 V Ta = 25°C; VIN = VIH or VIL; IOL = 50 µA; VCC = 4.5 V 4
Low-level output voltage VOL 0.36 V Ta = 25°C; VIN = VIH or VIL; IOL = 8 mA; VCC = 4.5 V 4
3-state output OFF-state leakage current IOZ -0.25 0.25 µA Ta = 25°C; VOUT = VCC or GND; VCC = 5.5 V 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; VIN = VCC or GND; VCC = 5.5 V 4
Quiescent supply current (additional, TTL input) ICCT 1.35 mA Ta = 25°C; per input VIN = 3.4 V; other input VCC or GND; VCC = 5.5 V 4
Output leakage current (Power-OFF) IOPD 0.5 µA Ta = 25°C; VOUT = 5.5 V; VCC = 0 V 4
High-level output voltage VOH 4.4 V Ta = -40 to 85°C; VIN = VIH or VIL; IOH = -50 µA; VCC = 4.5 V 4
High-level output voltage VOH 3.8 V Ta = -40 to 85°C; VIN = VIH or VIL; IOH = -8 mA; VCC = 4.5 V 4
Low-level output voltage VOL 0.1 V Ta = -40 to 85°C; VIN = VIH or VIL; IOL = 50 µA; VCC = 4.5 V 4
Low-level output voltage VOL 0.44 V Ta = -40 to 85°C; VIN = VIH or VIL; IOL = 8 mA; VCC = 4.5 V 4
3-state output OFF-state leakage current IOZ -2.5 2.5 µA Ta = -40 to 85°C; VOUT = VCC or GND; VCC = 5.5 V 4
Input leakage current IIN -1 1 µA Ta = -40 to 85°C; VIN = 5.5 V or GND 4
Quiescent supply current ICC 40 µA Ta = -40 to 85°C; VIN = VCC or GND; VCC = 5.5 V 4
Quiescent supply current (additional, TTL input) ICCT 1.5 mA Ta = -40 to 85°C; per input VIN = 3.4 V; other input VCC or GND; VCC = 5.5 V 4
Output leakage current (Power-OFF) IOPD 5 µA Ta = -40 to 85°C; VOUT = 5.5 V; VCC = 0 V 4
High-level input voltage VIH 2 V Ta = -40 to 125°C; VCC = 4.5 to 5.5 V 5
Low-level input voltage VIL 0.8 V Ta = -40 to 125°C; VCC = 4.5 to 5.5 V 5
High-level output voltage VOH 4.4 V Ta = -40 to 125°C; VIN = VIH or VIL; IOH = -50 µA; VCC = 4.5 V 5
High-level output voltage VOH 3.7 V Ta = -40 to 125°C; VIN = VIH or VIL; IOH = -8 mA; VCC = 4.5 V 5
Low-level output voltage VOL 0.1 V Ta = -40 to 125°C; VIN = VIH or VIL; IOL = 50 µA; VCC = 4.5 V 5
Low-level output voltage VOL 0.55 V Ta = -40 to 125°C; VIN = VIH or VIL; IOL = 8 mA; VCC = 4.5 V 5
3-state output OFF-state leakage current IOZ -10 10 µA Ta = -40 to 125°C; VOUT = VCC or GND; VCC = 5.5 V 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; VCC = 5.5 V 5
Quiescent supply current (additional, TTL input) ICCT 1.5 mA Ta = -40 to 125°C; per input VIN = 3.4 V; other input VCC or GND; VCC = 5.5 V 5
Output leakage current (Power-OFF) IOPD 20 µA Ta = -40 to 125°C; VOUT = 5.5 V; VCC = 0 V 5
Propagation delay time (tPLH,tPHL) tPLH,tPHL 5.4 7.4 ns Ta = 25°C; VCC = 5.0 ± 0.5 V; CL = 15 pF; RL = 1 kΩ 5
Propagation delay time (tPLH,tPHL) tPLH,tPHL 5.9 8.4 ns Ta = 25°C; VCC = 5.0 ± 0.5 V; CL = 50 pF; RL = 1 kΩ 5
3-state output enable time (tPZL,tPZH) tPZL,tPZH 8.3 11.3 ns Ta = 25°C; VCC = 5.0 ± 0.5 V; CL = 15 pF; RL = 1 kΩ 5
3-state output enable time (tPZL,tPZH) tPZL,tPZH 8.8 12.3 ns Ta = 25°C; VCC = 5.0 ± 0.5 V; CL = 50 pF; RL = 1 kΩ 5
3-state output disable time (tPLZ,tPHZ) tPLZ,tPHZ 9.4 11.9 ns Ta = 25°C; VCC = 5.0 ± 0.5 V; CL = 50 pF; RL = 1 kΩ 5
Output skew (tosLH,tosHL) tosLH,tosHL 1 ns Ta = 25°C; VCC = 5.0 ± 0.5 V; CL = 50 pF 5
Input capacitance CIN 10 pF Ta = 25°C 5
Propagation delay time (tPLH,tPHL) tPLH,tPHL 1 8.5 ns Ta = -40 to 85°C; VCC = 5.0 ± 0.5 V; CL = 15 pF; RL = 1 kΩ 5
Propagation delay time (tPLH,tPHL) tPLH,tPHL 1 9.5 ns Ta = -40 to 85°C; VCC = 5.0 ± 0.5 V; CL = 50 pF; RL = 1 kΩ 5
Propagation delay time (tPLH,tPHL) tPLH,tPHL 1 9.5 ns Ta = -40 to 125°C; VCC = 5.0 ± 0.5 V; CL = 15 pF; RL = 1 kΩ 6
Propagation delay time (tPLH,tPHL) tPLH,tPHL 1 10.5 ns Ta = -40 to 125°C; VCC = 5.0 ± 0.5 V; CL = 50 pF; RL = 1 kΩ 6

CAD (KiCad official)

  • Symbol: 74VHCT540AFT
  • Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
  • 3D model: TSSOP-20 (KiCad packages3D, STEP)
  • 3D model files: 74vhct540aft-etched.step / 74vhct540aft-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 74vhct540aft.step / 74vhct540aft.glb are the bare package body.

Provenance

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

  • Datasheet: TOSHIBA datasheet (8 pp, sha256 3a3485b289292fb2, retrieved 2026-10-16, 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