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U74HC245G

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

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U74HC245G

UTC Unisonic Tech · Buffers, Drivers, Receivers, Transceivers · TSSOP-20

U74HC245G 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 to A; input current is ±100 nA max at VCC=6V.
2 A1 bidirectional A-bus data line, 3-state output; active when OE is low and driven toward the B bus when DIR is high.
3 A2 bidirectional A-bus data line, 3-state output; active when OE is low and driven toward the B bus when DIR is high.
4 A3 bidirectional A-bus data line, 3-state output; active when OE is low and driven toward the B bus when DIR is high.
5 A4 bidirectional A-bus data line, 3-state output; active when OE is low and driven toward the B bus when DIR is high.
6 A5 bidirectional A-bus data line, 3-state output; active when OE is low and driven toward the B bus when DIR is high.
7 A6 bidirectional A-bus data line, 3-state output; active when OE is low and driven toward the B bus when DIR is high.
8 A7 bidirectional A-bus data line, 3-state output; active when OE is low and driven toward the B bus when DIR is high.
9 A8 bidirectional A-bus data line, 3-state output; active when OE is low and driven toward the B bus when DIR is high.
10 GND power_in Ground reference for the device.
11 B8 bidirectional B-bus data line, 3-state output; active when OE is low and driven toward the A bus when DIR is low.
12 B7 bidirectional B-bus data line, 3-state output; active when OE is low and driven toward the A bus when DIR is low.
13 B6 bidirectional B-bus data line, 3-state output; active when OE is low and driven toward the A bus when DIR is low.
14 B5 bidirectional B-bus data line, 3-state output; active when OE is low and driven toward the A bus when DIR is low.
15 B4 bidirectional B-bus data line, 3-state output; active when OE is low and driven toward the A bus when DIR is low.
16 B3 bidirectional B-bus data line, 3-state output; active when OE is low and driven toward the A bus when DIR is low.
17 B2 bidirectional B-bus data line, 3-state output; active when OE is low and driven toward the A bus when DIR is low.
18 B1 bidirectional B-bus data line, 3-state output; active when OE is low and driven toward the A bus when DIR is low.
19 OE input Output enable: high isolates the device from both buses; input current is ±100 nA max at VCC=6V.
20 VCC power_in Supply voltage, 2 V to 6 V recommended operating range (absolute maximum 7.0 V).

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 -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
Supply Voltage VCC 2 5 6 V 3
Input Voltage VIN 0 V 3
Output Voltage VOUT 0 V 3
Input Transition Rise and Fall Time tR / tF 1000 ns VCC=2V 3
Input Transition Rise and Fall Time tR / tF 500 ns VCC=4.5V 3
Input Transition Rise and Fall Time tR / tF 400 ns VCC=6V 3
Ambient Operating Temperature TA -40 125 °C 3
High-level input voltage VIH 1.5 V VCC=2V 3
High-level input voltage VIH 3.15 V VCC=4.5V 3
High-level input voltage VIH 4.2 V VCC=6V 3
Low-lever output voltage VIL 0.5 V VCC=2V 3
Low-lever output voltage VIL 1.35 V VCC=4.5V 3
Low-lever output voltage VIL 1.8 V VCC=6V 3
High-Level Output Voltage VOH 1.9 1.998 V VCC=2V, IOH=-20μA 3
High-Level Output Voltage VOH 4.4 4.499 V VCC=4.5V, IOH=-20μA 3
High-Level Output Voltage VOH 5.9 5.999 V VCC=6V, IOH=-20μA 3
High-Level Output Voltage VOH 3.98 4.3 V VCC=4.5V, IOH=-6mA 3
High-Level Output Voltage VOH 5.48 5.8 V VCC=6V, IOH=-7.8mA 3
Low-Level Output Voltage VOL 0.002 0.1 V VCC=2V, IOL=20μA 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
Low-Level Output Voltage VOL 0.15 0.26 V VCC=6V, IOL=7.8mA 3
Input Current of DIR or OE II(LEAK) -100 0.1 100 nA VCC=6V, VIN=VCC or GND 3
Output OFF-state current IOZ -0.5 0.01 0.5 μA VCC=6V, VOUT=VCC or GND 3
Quiescent Supply Current IQ 8 μA VCC=6V, VIN=VCC or GND, IOUT=0 3
Input Capacitance of DIR or OE CIN 3 10 pF VCC=6V, VIN=VCC or GND 3
Propagation delay from input (A or B) to output (B or A) (tPLH/tPHL) tPD 40 105 ns VCC=2V, CL=50pF, RL=1kΩ 4
Propagation delay from input (A or B) to output (B or A) (tPLH/tPHL) tPD 15 21 ns VCC=4.5V, CL=50pF, RL=1kΩ 4
Propagation delay from input (A or B) to output (B or A) (tPLH/tPHL) tPD 12 18 ns VCC=6V, CL=50pF, RL=1kΩ 4
3-state output enable time from input (OE) to output (A or B) (tPZL/tPZH) tEN 125 230 ns VCC=2V, CL=50pF, RL=1kΩ 4
3-state output enable time from input (OE) to output (A or B) (tPZL/tPZH) tEN 23 46 ns VCC=4.5V, CL=50pF, RL=1kΩ 4
3-state output enable time from input (OE) to output (A or B) (tPZL/tPZH) tEN 20 39 ns VCC=6V, CL=50pF, RL=1kΩ 4
3-state output disable time from input (OE) to output (A or B) (tPLZ/tPHZ) tDIS 74 200 ns VCC=2V, CL=50pF, RL=1kΩ 4
3-state output disable time from input (OE) to output (A or B) (tPLZ/tPHZ) tDIS 25 40 ns VCC=4.5V, CL=50pF, RL=1kΩ 4
3-state output disable time from input (OE) to output (A or B) (tPLZ/tPHZ) tDIS 21 34 ns VCC=6V, CL=50pF, RL=1kΩ 4
Output transition time (A or B) (tR/tF) tT 20 60 ns VCC=2V, CL=50pF, RL=1kΩ 4
Output transition time (A or B) (tR/tF) tT 8 12 ns VCC=4.5V, CL=50pF, RL=1kΩ 4
Output transition time (A or B) (tR/tF) tT 6 10 ns VCC=6V, CL=50pF, RL=1kΩ 4
Junction to Ambient, TSSOP-20 θJA 103 °C/W Junction to Ambient 3

CAD (KiCad official)

  • Symbol: U74HC245G
  • Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
  • 3D model: TSSOP-20 (KiCad packages3D, STEP)
  • 3D model files: u74hc245g-etched.step / u74hc245g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); u74hc245g.step / u74hc245g.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 e648c9f1eef17726, retrieved 2026-10-19, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-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