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U74HCT245G

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UTC Unisonic Tech Logic Gates, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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U74HCT245G

UTC Unisonic Tech · Logic Gates · TSSOP-20

U74HCT245G from UTC Unisonic Tech, 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 DIR input Direction control: high transmits data from the A bus to the B bus, low transmits from B bus to A bus.
2 A1 bidirectional A-bus data I/O 1, TTL-compatible input with 3-state output.
3 A2 bidirectional A-bus data I/O 2, TTL-compatible input with 3-state output.
4 A3 bidirectional A-bus data I/O 3, TTL-compatible input with 3-state output.
5 A4 bidirectional A-bus data I/O 4, TTL-compatible input with 3-state output.
6 A5 bidirectional A-bus data I/O 5, TTL-compatible input with 3-state output.
7 A6 bidirectional A-bus data I/O 6, TTL-compatible input with 3-state output.
8 A7 bidirectional A-bus data I/O 7, TTL-compatible input with 3-state output.
9 A8 bidirectional A-bus data I/O 8, TTL-compatible input with 3-state output.
10 GND power_in Ground (0 V) reference.
11 B8 bidirectional B-bus data I/O 8, TTL-compatible input with 3-state output.
12 B7 bidirectional B-bus data I/O 7, TTL-compatible input with 3-state output.
13 B6 bidirectional B-bus data I/O 6, TTL-compatible input with 3-state output.
14 B5 bidirectional B-bus data I/O 5, TTL-compatible input with 3-state output.
15 B4 bidirectional B-bus data I/O 4, TTL-compatible input with 3-state output.
16 B3 bidirectional B-bus data I/O 3, TTL-compatible input with 3-state output.
17 B2 bidirectional B-bus data I/O 2, TTL-compatible input with 3-state output.
18 B1 bidirectional B-bus data I/O 1, TTL-compatible input with 3-state output.
19 OE input Active-low output enable: high isolates the device from the buses.
20 VCC power_in Supply voltage, recommended 4.5V to 5.5V (absolute maximum 7.0V).

Key specifications

Parameter Value
Manufacturer UTC Unisonic Tech
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 4.5 5 5.5 V 3
Input Voltage VIN 0 V 3
Output Voltage VOUT 0 V 3
Input Transition Rise and Fall Time tR / tF 500 ns 3
Ambient Operating Temperature TA -40 125 °C 3
Supply Voltage VCC -0.5 7 V 3
Input Clamp Current IIK -20 20 mA VIN<0 3
Output Clamp Current IOK -20 20 mA VOUT<0 3
Output Current IOUT -35 35 mA 3
VCC or GND Current ICC -70 70 mA 3
Storage Temperature TSTG -65 150 °C 3
High-Level input voltage VIH 2 V VCC=4.5V~5.5V 3
Low-Level input voltage VIL 0.8 V VCC=4.5V~5.5V 3
High-Level Output Voltage VOH 4.4 4.499 V VCC=4.5V, IOH=-20μA 3
High-Level Output Voltage VOH 3.98 4.3 V VCC=4.5V, IOH=-6mA 3
Low-Level Output Voltage VOL 0.001 0.1 V VCC=4.5V, IOL=20μA 3
Low-Level Output Voltage VOL 0.17 0.26 V VCC=4.5V, IOL=6mA 3
Input Current of DIR or OE II(LEAK) -100 100 nA VCC=5.5V, VIN=VCC or GND 3
Output OFF-state current IOZ -0.5 0.5 μA VCC=5.5V, VOUT=VCC or GND 3
Quiescent Supply Current ICC 8 μA VCC=5.5V, VIN=VCC or GND, IOUT=0 3
Additional Quiescent Supply Current ΔICC 1.4 2.4 mA VCC=5.5V, One input at 0.5V or 2.4V, other inputs at 0 or VCC 3
Input Capacitance of DIR or OE CIN 3 10 pF VCC=5.5V, VIN=VCC or GND 3
Propagation delay from input (A or B) to output (B or A), CL=50pF tPD (tPLH/tPHL) 16 22 ns TA=25°C, RL=1kΩ, CL=50pF, VCC=4.5V 4
Propagation delay from input (A or B) to output (B or A), CL=50pF tPD (tPLH/tPHL) 14 20 ns TA=25°C, RL=1kΩ, CL=50pF, VCC=5.5V 4
3-state output enable time from OE to output (A or B), CL=50pF tEN (tPZL/tPZH) 25 46 ns TA=25°C, RL=1kΩ, CL=50pF, VCC=4.5V 4
3-state output enable time from OE to output (A or B), CL=50pF tEN (tPZL/tPZH) 22 41 ns TA=25°C, RL=1kΩ, CL=50pF, VCC=5.5V 4
3-state output disable time from OE to output (A or B), CL=50pF tDIS (tPLZ/tPHZ) 26 40 ns TA=25°C, RL=1kΩ, CL=50pF, VCC=4.5V 4
3-state output disable time from OE to output (A or B), CL=50pF tDIS (tPLZ/tPHZ) 23 36 ns TA=25°C, RL=1kΩ, CL=50pF, VCC=5.5V 4
Output transition time (A or B), CL=50pF tT (tR/tF) 9 12 ns TA=25°C, RL=1kΩ, CL=50pF, VCC=4.5V 4
Output transition time (A or B), CL=50pF tT (tR/tF) 8 11 ns TA=25°C, RL=1kΩ, CL=50pF, VCC=5.5V 4
Propagation delay from input (A or B) to output (B or A), CL=150pF tPD (tPLH/tPHL) 20 30 ns TA=25°C, RL=1kΩ, CL=150pF, VCC=4.5V 4
Propagation delay from input (A or B) to output (B or A), CL=150pF tPD (tPLH/tPHL) 18 27 ns TA=25°C, RL=1kΩ, CL=150pF, VCC=5.5V 4
3-state output enable time from OE to output (A or B), CL=150pF tEN (tPZL/tPZH) 36 59 ns TA=25°C, RL=1kΩ, CL=150pF, VCC=4.5V 4
3-state output enable time from OE to output (A or B), CL=150pF tEN (tPZL/tPZH) 30 53 ns TA=25°C, RL=1kΩ, CL=150pF, VCC=5.5V 4
Output transition time (A or B), CL=150pF tT (tR/tF) 17 42 ns TA=25°C, RL=1kΩ, CL=150pF, VCC=4.5V 4
Output transition time (A or B), CL=150pF tT (tR/tF) 14 38 ns TA=25°C, RL=1kΩ, CL=150pF, VCC=5.5V 4

CAD (KiCad official)

  • Symbol: U74HCT245G
  • Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
  • 3D model: TSSOP-20 (KiCad packages3D, STEP)
  • 3D model files: u74hct245g-etched.step / u74hct245g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); u74hct245g.step / u74hct245g.glb are the bare package body.

Provenance

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

  • Datasheet: UTC Unisonic Tech datasheet (5 pp, sha256 def9debb908d308d, retrieved 2026-10-17, 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