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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.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownU74HCT245G
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);u74hct245g.step/u74hct245g.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).