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MM74HCT240MTCX

Public Made by Adom

by adom

onsemi Logic ICs, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MM74HCT240MTCX

onsemi · Logic ICs · TSSOP-20

MM74HCT240MTCX 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 3-STATE enable for the 1Y1-1Y4 outputs, TTL-compatible input with VIH min 2.0 V and VIL max 0.8 V.
2 1A1 input Buffer input 1A1, TTL-compatible with VIH min 2.0 V and VIL max 0.8 V, inverted to 1Y1.
3 2Y4 tri_state Inverting 3-STATE output for 2A4, high-impedance when 2G is high, with 6 mA (min) output drive.
4 1A2 input Buffer input 1A2, TTL-compatible with VIH min 2.0 V and VIL max 0.8 V, inverted to 1Y2.
5 2Y3 tri_state Inverting 3-STATE output for 2A3, high-impedance when 2G is high, with 6 mA (min) output drive.
6 1A3 input Buffer input 1A3, TTL-compatible with VIH min 2.0 V and VIL max 0.8 V, inverted to 1Y3.
7 2Y2 tri_state Inverting 3-STATE output for 2A2, high-impedance when 2G is high, with 6 mA (min) output drive.
8 1A4 input Buffer input 1A4, TTL-compatible with VIH min 2.0 V and VIL max 0.8 V, inverted to 1Y4.
9 2Y1 tri_state Inverting 3-STATE output for 2A1, high-impedance when 2G is high, with 6 mA (min) output drive.
10 GND power_in Ground reference; absolute maximum VCC or GND current is ±70 mA per pin.
11 2A1 input Buffer input 2A1, TTL-compatible with VIH min 2.0 V and VIL max 0.8 V, inverted to 2Y1.
12 1Y4 tri_state Inverting 3-STATE output for 1A4, high-impedance when 1G is high, with 6 mA (min) output drive.
13 2A2 input Buffer input 2A2, TTL-compatible with VIH min 2.0 V and VIL max 0.8 V, inverted to 2Y2.
14 1Y3 tri_state Inverting 3-STATE output for 1A3, high-impedance when 1G is high, with 6 mA (min) output drive.
15 2A3 input Buffer input 2A3, TTL-compatible with VIH min 2.0 V and VIL max 0.8 V, inverted to 2Y3.
16 1Y2 tri_state Inverting 3-STATE output for 1A2, high-impedance when 1G is high, with 6 mA (min) output drive.
17 2A4 input Buffer input 2A4, TTL-compatible with VIH min 2.0 V and VIL max 0.8 V, inverted to 2Y4.
18 1Y1 tri_state Inverting 3-STATE output for 1A1, high-impedance when 1G is high, with 6 mA (min) output drive.
19 2G input Active-low 3-STATE enable for the 2Y1-2Y4 outputs, TTL-compatible input with VIH min 2.0 V and VIL max 0.8 V.
20 VCC power_in Positive supply, recommended operating range 4.5 V to 5.5 V (absolute maximum -0.5 to 7.0 V).

Key specifications

Parameter Value
Manufacturer onsemi
Package TSSOP-20
Category Logic ICs
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) VCC 4.5 5.5 V 4
Operating Temperature Range (TA) TA -40 85 °C 4
Input Rise or Fall Times tr, tf 500 ns 4
DC Input or Output Voltage VIN, VOUT 0 V max equals VCC 4
Supply Voltage (VCC) VCC -0.5 7 V 4
DC Input Voltage VIN -1.5 V upper limit VCC+1.5 V 4
DC Output Voltage VOUT -0.5 V upper limit VCC+0.5 V 4
Clamp Diode Current IIK, IOK -20 20 mA 4
DC Output Current, per pin IOUT -35 35 mA 4
DC VCC or GND Current, per pin ICC -70 70 mA 4
Storage Temperature Range TSTG -65 150 °C 4
Power Dissipation PD 600 mW plastic N package (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 2 V guaranteed limit at TA -40 to 85 C 4
Maximum LOW Level Input Voltage VIL 0.8 V guaranteed limit at TA -40 to 85 C 4
Minimum HIGH Level Output Voltage VOH 3.84 4.2 V /IOUT/ 6.0 mA, VCC 4.5V; VIN VIH or VIL 4
Minimum HIGH Level Output Voltage VOH 4.84 5.2 V /IOUT/ 7.2 mA, VCC 5.5V; VIN VIH or VIL 4
Maximum LOW Level Output Voltage VOL 0 0.1 V /IOUT/ 20 µA; VIN VIH or VIL 4
Maximum LOW Level Output Voltage VOL 0.2 0.33 V /IOUT/ 6.0 mA, VCC 4.5V; VIN VIH or VIL 4
Maximum Input Current IIN -0.5 0.05 0.5 µA VIN VCC or GND; VIH or VIL 4
Maximum 3-STATE Output Leakage Current IOZ -2.5 0.25 2.5 µA VOUT VCC or GND; G VIH or G VIL 4
Maximum Quiescent Supply Current ICC 4 40 µA VIN VCC or GND; IOUT 0 µA 4
Maximum Quiescent Supply Current (TTL inputs) ICC 0.6 1.3 mA VIN 2.4V or 0.5V (Note 4) 4
Maximum Propagation Delay tPHL, tPLH 14 25 ns CL 50 pF 5
Maximum Propagation Delay tPHL, tPLH 20 35 ns CL 150 pF 5
Maximum Output Enable Time tPZH, tPZL 21 38 ns RL 1 kΩ, CL 50 pF 5
Maximum Output Enable Time tPZH, tPZL 26 53 ns RL 1 kΩ, CL 150 pF 5
Maximum Output Disable Time tPHZ, tPLZ 16 32 ns RL 1 kΩ, CL 50 pF 5
Maximum Output Rise and Fall Time tTHL, tTLH 6 15 ns CL 50 pF 5
Maximum Input Capacitance CIN 10 15 pF 5
Maximum Output Capacitance COUT 15 20 pF 5

CAD (KiCad official)

  • Symbol: MM74HCT240MTCX
  • Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
  • 3D model: TSSOP-20 (KiCad packages3D, STEP)
  • 3D model files: mm74hct240mtcx-etched.step / mm74hct240mtcx-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mm74hct240mtcx.step / mm74hct240mtcx.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (10 pp, sha256 997baff6099f2ae7, retrieved 2026-10-27, tier: manufacturer)
  • 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