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74VHCT244AMTCX

Public Made by Adom

by adom

onsemi Buffers, Drivers, Receivers, Transceivers, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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74VHCT244AMTCX

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

74VHCT244AMTCX from onsemi, 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 OE1 input Active-LOW 3-STATE output enable for outputs O0-O3 (pins 18, 16, 14, 12); HIGH puts them in high impedance.
2 I0 input Data input 0, buffered non-inverting to O0 (pin 18).
3 O4 tri_state 3-STATE output 4, follows I4 (pin 17) when OE2 is LOW and is high impedance when OE2 is HIGH.
4 I1 input Data input 1, buffered non-inverting to O1 (pin 16).
5 O5 tri_state 3-STATE output 5, follows I5 (pin 15) when OE2 is LOW and is high impedance when OE2 is HIGH.
6 I2 input Data input 2, buffered non-inverting to O2 (pin 14).
7 O6 tri_state 3-STATE output 6, follows I6 (pin 13) when OE2 is LOW and is high impedance when OE2 is HIGH.
8 I3 input Data input 3, buffered non-inverting to O3 (pin 12).
9 O7 tri_state 3-STATE output 7, follows I7 (pin 11) when OE2 is LOW and is high impedance when OE2 is HIGH.
10 GND power_in Ground, 0 V reference.
11 I7 input Data input 7, buffered non-inverting to O7 (pin 9).
12 O3 tri_state 3-STATE output 3, follows I3 (pin 8) when OE1 is LOW and is high impedance when OE1 is HIGH.
13 I6 input Data input 6, buffered non-inverting to O6 (pin 7).
14 O2 tri_state 3-STATE output 2, follows I2 (pin 6) when OE1 is LOW and is high impedance when OE1 is HIGH.
15 I5 input Data input 5, buffered non-inverting to O5 (pin 5).
16 O1 tri_state 3-STATE output 1, follows I1 (pin 4) when OE1 is LOW and is high impedance when OE1 is HIGH.
17 I4 input Data input 4, buffered non-inverting to O4 (pin 3).
18 O0 tri_state 3-STATE output 0, follows I0 (pin 2) when OE1 is LOW and is high impedance when OE1 is HIGH.
19 OE2 input Active-LOW 3-STATE output enable for outputs O4-O7 (pins 3, 5, 7, 9); HIGH puts them in high impedance.
20 VCC power_in Positive supply, recommended 4.5 V to 5.5 V (absolute maximum 7.0 V).

Key specifications

Parameter Value
Manufacturer onsemi
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 V; TA -40 to 85 °C 3
LOW Level Input Voltage VIL 0.8 V VCC 4.5 V; TA -40 to 85 °C 3
HIGH Level Output Voltage VOH 4.4 4.5 V VCC 4.5 V; VIN VIH or VIL; IOH 50 µA; TA 25 °C 3
HIGH Level Output Voltage VOH 4.4 V VCC 4.5 V; VIN VIH or VIL; IOH 50 µA; TA -40 to 85 °C 3
HIGH Level Output Voltage VOH 3.94 V VCC 4.5 V; VIN VIH or VIL; IOH 8 mA; TA 25 °C 3
HIGH Level Output Voltage VOH 3.8 V VCC 4.5 V; VIN VIH or VIL; IOH 8 mA; TA -40 to 85 °C 3
LOW Level Output Voltage VOL 0 0.1 V VCC 4.5 V; VIN VIH or VIL; IOL 50 µA; TA 25 °C 3
LOW Level Output Voltage VOL 0.1 V VCC 4.5 V; VIN VIH or VIL; IOL 50 µA; TA -40 to 85 °C 3
LOW Level Output Voltage VOL 0.36 V VCC 4.5 V; VIN VIH or VIL; IOL 8 mA; TA 25 °C 3
LOW Level Output Voltage VOL 0.44 V VCC 4.5 V; VIN VIH or VIL; IOL 8 mA; TA -40 to 85 °C 3
3-STATE Output Off-State Current IOZ -0.25 0.25 µA VCC 5.5 V; VIN VIH or VIL; VOUT VCC or GND; TA 25 °C 3
3-STATE Output Off-State Current IOZ -2.5 2.5 µA VCC 5.5 V; VIN VIH or VIL; VOUT VCC or GND; TA -40 to 85 °C 3
Input Leakage Current IIN -0.1 0.1 µA VCC 0-5.5 V; VIN 5.5 V or GND; TA 25 °C 3
Input Leakage Current IIN -1 1 µA VCC 0-5.5 V; VIN 5.5 V or GND; TA -40 to 85 °C 3
Quiescent Supply Current ICC 4 µA VCC 5.5 V; VIN VCC or GND; TA 25 °C 3
Quiescent Supply Current ICC 40 µA VCC 5.5 V; VIN VCC or GND; TA -40 to 85 °C 3
Maximum ICC/Input ICCT 1.35 mA VCC 5.5 V; VIN 3.4 V; other input VCC or GND; TA 25 °C 3
Maximum ICC/Input ICCT 1.5 mA VCC 5.5 V; VIN 3.4 V; other input VCC or GND; TA -40 to 85 °C 3
Output Leakage Current (Power Down State) IOFF 0.5 µA VCC 0.0 V; VOUT 5.5 V; TA 25 °C 3
Output Leakage Current (Power Down State) IOFF 5 µA VCC 0.0 V; VOUT 5.5 V; TA -40 to 85 °C 3
Minimum HIGH Level Dynamic Input Voltage VIHD 2 V VCC 5.0 V; CL 50 pF; TA 25 °C 4
Maximum LOW Level Dynamic Input Voltage VILD 0.8 V VCC 5.0 V; CL 50 pF; TA 25 °C 4
Quiet Output Maximum Dynamic VOL VOLP 0.9 1.1 V VCC 5.0 V; CL 50 pF; TA 25 °C 4
Quiet Output Minimum Dynamic VOL VOLV 0.9 1.1 V VCC 5.0 V; CL 50 pF; TA 25 °C 4
Propagation Delay Time (LOW-to-HIGH) tPLH 5.4 7.4 ns VCC 5.0 ± 0.5 V; CL 15 pF; TA 25 °C 4
Propagation Delay Time (LOW-to-HIGH) tPLH 1 8.5 ns VCC 5.0 ± 0.5 V; CL 15 pF; TA -40 to 85 °C 4
Propagation Delay Time (HIGH-to-LOW) tPHL 5.9 8.4 ns VCC 5.0 ± 0.5 V; CL 50 pF; TA 25 °C 4
Propagation Delay Time (HIGH-to-LOW) tPHL 1 9.5 ns VCC 5.0 ± 0.5 V; CL 50 pF; TA -40 to 85 °C 4
3-STATE Output Enable Time (LOW) tPZL 7.7 10.4 ns VCC 5.0 ± 0.5 V; RL 1 kΩ; CL 15 pF; TA 25 °C 4
3-STATE Output Enable Time (LOW) tPZL 1 12.5 ns VCC 5.0 ± 0.5 V; RL 1 kΩ; CL 15 pF; TA -40 to 85 °C 4
3-STATE Output Enable Time (HIGH) tPZH 8.2 11.4 ns VCC 5.0 ± 0.5 V; CL 50 pF; TA 25 °C 4
3-STATE Output Enable Time (HIGH) tPZH 1 13.5 ns VCC 5.0 ± 0.5 V; CL 50 pF; TA -40 to 85 °C 4
3-STATE Output Disable Time tPLZ, tPHZ 8.8 11.4 ns VCC 5.0 ± 0.5 V; RL 1 kΩ; CL 50 pF; TA 25 °C 4
3-STATE Output Disable Time tPLZ, tPHZ 1 13 ns VCC 5.0 ± 0.5 V; RL 1 kΩ; CL 50 pF; TA -40 to 85 °C 4
Output to Output Skew (LOW-to-HIGH) tOSLH 1 ns VCC 5.0 ± 0.5 V; Note 8 4
Output to Output Skew (HIGH-to-LOW) tOSHL 1 ns VCC 5.0 ± 0.5 V; Note 8 4
Input Capacitance CIN 4 10 pF VCC Open; TA 25 °C 4
Input Capacitance CIN 10 pF VCC Open; TA -40 to 85 °C 4
Absolute maximum Supply Voltage VCC -0.5 7 V 3
Absolute maximum DC Input Voltage VIN -0.5 7 V 3
Absolute maximum DC Output Voltage (Note 3) VOUT -0.5 V Note 3: HIGH or LOW state; upper limit printed as VCC + 0.5 V 3
Absolute maximum DC Output Voltage (Note 4) VOUT -0.5 7 V Note 4: outputs in OFF-state or VCC = 0 V 3
Input Diode Current IIK 20 mA 3
Output Diode Current (Note 5) IOK -20 20 mA Note 5: VOUT < GND or VOUT > VCC (outputs active) 3
DC Output Current IOUT -25 25 mA 3
DC VCC/GND Current ICC -75 75 mA 3
Storage Temperature TSTG -65 150 °C 3
Lead Temperature (Soldering) TL 260 °C Soldering, 10 seconds 3
Supply Voltage VCC 4.5 5.5 V 3
Input Voltage VIN 0 5.5 V 3
Output Voltage (Note 3) VOUT 0 V Note 3: HIGH or LOW state; upper limit printed as VCC 3
Output Voltage (Note 4) VOUT 0 5.5 V Note 4: outputs in OFF-state 3
Operating Temperature TOPR -40 85 °C 3
Input Rise and Fall Time tr, tf 0 20 ns/V VCC 5.0 V ± 0.5 V 3
Power Dissipation Capacitance CPD 18 pF Note 9 4
Output Capacitance COUT 9 pF VCC 5.0 V 4

CAD (KiCad official)

  • Symbol: 74VHCT244AMTCX
  • Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
  • 3D model: TSSOP-20 (KiCad packages3D, STEP)
  • 3D model files: 74vhct244amtcx-etched.step / 74vhct244amtcx-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 74vhct244amtcx.step / 74vhct244amtcx.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (8 pp, sha256 0e73030ec6993e5b, retrieved 2026-10-18, 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