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MM74HC240MTCX

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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MM74HC240MTCX

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

MM74HC240MTCX 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 1G input Active-LOW output enable for the first group of four buffers (1A1-1A4 to 1Y1-1Y4); HIGH puts outputs 1Y1-1Y4 in high impedance.
2 1A1 input Buffer input 1A1, inverted to output 1Y1 when 1G is LOW.
3 2Y4 tri_state 3-STATE inverting output of 2A4 group 2, high impedance when 2G is HIGH, rated 6 mA output current.
4 1A2 input Buffer input 1A2, inverted to output 1Y2 when 1G is LOW.
5 2Y3 tri_state 3-STATE inverting output of 2A3 group 2, high impedance when 2G is HIGH, rated 6 mA output current.
6 1A3 input Buffer input 1A3, inverted to output 1Y3 when 1G is LOW.
7 2Y2 tri_state 3-STATE inverting output of 2A2 group 2, high impedance when 2G is HIGH, rated 6 mA output current.
8 1A4 input Buffer input 1A4, inverted to output 1Y4 when 1G is LOW.
9 2Y1 tri_state 3-STATE inverting output of 2A1 group 2, high impedance when 2G is HIGH, rated 6 mA output current.
10 GND power_in Ground, 0 V reference.
11 2A1 input Buffer input 2A1, inverted to output 2Y1 when 2G is LOW.
12 1Y4 tri_state 3-STATE inverting output of 1A4, high impedance when 1G is HIGH, rated 6 mA output current.
13 2A2 input Buffer input 2A2, inverted to output 2Y2 when 2G is LOW.
14 1Y3 tri_state 3-STATE inverting output of 1A3, high impedance when 1G is HIGH, rated 6 mA output current.
15 2A3 input Buffer input 2A3, inverted to output 2Y3 when 2G is LOW.
16 1Y2 tri_state 3-STATE inverting output of 1A2, high impedance when 1G is HIGH, rated 6 mA output current.
17 2A4 input Buffer input 2A4, inverted to output 2Y4 when 2G is LOW.
18 1Y1 tri_state 3-STATE inverting output of 1A1, high impedance when 1G is HIGH, rated 6 mA output current.
19 2G input Active-LOW output enable for the second group of four buffers (2A1-2A4 to 2Y1-2Y4); HIGH puts outputs 2Y1-2Y4 in high impedance.
20 VCC power_in Positive supply voltage, recommended 2 V to 6 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
Supply Voltage VCC 2 6 V 4
DC Input or Output Voltage VIN, VOUT 0 V Max printed as VCC 4
Operating Temperature Range TA -40 85 °C 4
Input Rise or Fall Time tr, tf 1000 ns VCC 2.0V 4
Input Rise or Fall Time tr, tf 500 ns VCC 4.5V 4
Input Rise or Fall Time tr, tf 400 ns VCC 6.0V 4
Supply Voltage VCC -0.5 7 V Voltages referenced to ground (Note 2) 4
DC Input Voltage VIN -1.5 V Max printed as VCC + 1.5 V 4
DC Output Voltage VOUT -0.5 V Max printed as VCC + 0.5 V 4
Clamp Diode Current IIK, IOK -20 20 mA 4
DC Output Current, per pin IOUT -35 35 mA per pin 4
DC VCC or GND Current, per pin ICC -70 70 mA per pin 4
Storage Temperature Range TSTG -65 150 °C 4
Power Dissipation PD 600 mW Note 3 4
Power Dissipation PD 500 mW S.O. package only 4
Lead Temperature TL 260 °C Soldering 10 seconds 4
Minimum HIGH Level Input Voltage VIH 1.5 V VCC 2.0V, TA -40 to 85°C 4
Minimum HIGH Level Input Voltage VIH 3.15 V VCC 4.5V, TA -40 to 85°C 4
Minimum HIGH Level Input Voltage VIH 4.2 V VCC 6.0V, TA -40 to 85°C 4
Maximum LOW Level Input Voltage VIL 0.5 V VCC 2.0V, TA -40 to 85°C 4
Maximum LOW Level Input Voltage VIL 1.35 V VCC 4.5V, TA -40 to 85°C 4
Maximum LOW Level Input Voltage VIL 1.8 V VCC 6.0V, TA -40 to 85°C 4
Minimum HIGH Level Output Voltage VOH 1.9 2 V VIN VIH or VIL, /IOUT/ ≤ 20 µA, VCC 2.0V, TA -40 to 85°C 4
Minimum HIGH Level Output Voltage VOH 4.4 4.5 V VIN VIH or VIL, /IOUT/ ≤ 20 µA, VCC 4.5V, TA -40 to 85°C 4
Minimum HIGH Level Output Voltage VOH 5.9 6 V VIN VIH or VIL, /IOUT/ ≤ 20 µA, VCC 6.0V, TA -40 to 85°C 4
Minimum HIGH Level Output Voltage VOH 3.84 4.2 V VIN VIH or VIL, /IOUT/ ≤ 6.0 mA, VCC 4.5V, TA -40 to 85°C 4
Minimum HIGH Level Output Voltage VOH 5.34 5.7 V VIN VIH or VIL, /IOUT/ ≤ 7.8 mA, VCC 6.0V, TA -40 to 85°C 4
Maximum LOW Level Output Voltage VOL 0 0.1 V VIN VIH or VIL, /IOUT/ ≤ 20 µA, VCC 2.0V, TA -40 to 85°C 4
Maximum LOW Level Output Voltage VOL 0.2 0.33 V VIN VIH or VIL, /IOUT/ ≤ 6.0 mA, VCC 4.5V, TA -40 to 85°C 4
Maximum Input Current IIN -1 1 µA VIN VCC or GND, VCC 6.0V, TA -40 to 85°C 4
Maximum 3-STATE Output Leakage Current IOZ -5 5 µA VIN VIH or VIL, VOUT VCC or GND, G VIH or G VIL, VCC 6.0V, TA -40 to 85°C 4
Maximum Quiescent Supply Current ICC 80 µA VIN VCC or GND, IOUT 0 µA, VCC 6.0V, TA -40 to 85°C 4
Maximum Propagation Delay tPHL, tPLH 55 126 ns CL 50 pF, VCC 2.0V, TA -40 to 85°C 5
Maximum Propagation Delay tPHL, tPLH 80 190 ns CL 150 pF, VCC 2.0V, TA -40 to 85°C 5
Maximum Propagation Delay tPHL, tPLH 12 25 ns CL 50 pF, VCC 4.5V, TA -40 to 85°C 5
Maximum Propagation Delay tPHL, tPLH 22 38 ns CL 150 pF, VCC 4.5V, TA -40 to 85°C 5
Maximum Propagation Delay tPHL, tPLH 11 21 ns CL 50 pF, VCC 6.0V, TA -40 to 85°C 5
Maximum Propagation Delay tPHL, tPLH 28 32 ns CL 150 pF, VCC 6.0V, TA -40 to 85°C 5
Maximum Output Enable Time tPZH, tPZL 75 189 ns RL 1 kΩ, CL 50 pF, VCC 2.0V, TA -40 to 85°C 5
Maximum Output Enable Time tPZH, tPZL 100 252 ns RL 1 kΩ, CL 150 pF, VCC 2.0V, TA -40 to 85°C 5
Maximum Output Enable Time tPZH, tPZL 15 38 ns RL 1 kΩ, CL 50 pF, VCC 4.5V, TA -40 to 85°C 5
Maximum Output Enable Time tPZH, tPZL 20 50 ns RL 1 kΩ, CL 150 pF, VCC 4.5V, TA -40 to 85°C 5
Maximum Output Enable Time tPZH, tPZL 13 32 ns RL 1 kΩ, CL 50 pF, VCC 6.0V, TA -40 to 85°C 5
Maximum Output Enable Time tPZH, tPZL 17 43 ns RL 1 kΩ, CL 150 pF, VCC 6.0V, TA -40 to 85°C 5
Maximum Output Disable Time tPHZ, tPLZ 75 189 ns RL 1 kΩ, VCC 2.0V, TA -40 to 85°C 5
Maximum Output Disable Time tPHZ, tPLZ 15 38 ns RL 1 kΩ, CL 50 pF, VCC 4.5V, TA -40 to 85°C 5
Maximum Output Disable Time tPHZ, tPLZ 13 32 ns RL 1 kΩ, VCC 6.0V, TA -40 to 85°C 5
Maximum Output Rise and Fall Time tTLH, tTHL 75 ns VCC 2.0V, TA -40 to 85°C 5
Maximum Output Rise and Fall Time tTLH, tTHL 15 ns VCC 4.5V, TA -40 to 85°C 5
Maximum Output Rise and Fall Time tTLH, tTHL 13 ns VCC 6.0V, TA -40 to 85°C 5
Maximum Input Capacitance CIN 5 10 pF 5
Maximum Output Capacitance COUT 10 20 pF 5
Maximum Propagation Delay tPHL, tPLH 12 18 ns VCC 5V, TA 25°C, CL 45 pF 5
Maximum Enable Delay to Active Output tPZH, tPZL 14 28 ns VCC 5V, TA 25°C, RL 1 kΩ, CL 45 pF 5
Maximum Disable Delay from Active Output tPHZ, tPLZ 13 25 ns VCC 5V, TA 25°C, RL 1 kΩ, CL 5 pF 5

CAD (KiCad official)

  • Symbol: MM74HC240MTCX
  • Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
  • 3D model: TSSOP-20 (KiCad packages3D, STEP)
  • 3D model files: mm74hc240mtcx-etched.step / mm74hc240mtcx-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mm74hc240mtcx.step / mm74hc240mtcx.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (10 pp, sha256 aac615dc46ee189c, retrieved 2026-10-20, 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