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SN74ACT245PWR

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by Ray

Texas Instruments Buffer/Driver/Transceiver, TSSOP-20. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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SN74ACT245PWR

Texas Instruments · Buffer/Driver/Transceiver · TSSOP-20

SN74ACT245PWR from Texas Instruments, in a TSSOP-20. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 DIR input Direction control input. When HIGH, data flows from A-port to B-port; when LOW, data flows from B-port to A-port. TTL-compatible input (VIH ≥ 2V, VIL ≤ 0.8V).
2 A1 bidirectional Channel 1 A-side data I/O. Acts as input when DIR=LOW, output when DIR=HIGH (and OE=LOW). IOH/IOL = ±24 mA.
3 A2 bidirectional Channel 2 A-side data I/O. Acts as input when DIR=LOW, output when DIR=HIGH (and OE=LOW). IOH/IOL = ±24 mA.
4 A3 bidirectional Channel 3 A-side data I/O. Acts as input when DIR=LOW, output when DIR=HIGH (and OE=LOW). IOH/IOL = ±24 mA.
5 A4 bidirectional Channel 4 A-side data I/O. Acts as input when DIR=LOW, output when DIR=HIGH (and OE=LOW). IOH/IOL = ±24 mA.
6 A5 bidirectional Channel 5 A-side data I/O. Acts as input when DIR=LOW, output when DIR=HIGH (and OE=LOW). IOH/IOL = ±24 mA.
7 A6 bidirectional Channel 6 A-side data I/O. Acts as input when DIR=LOW, output when DIR=HIGH (and OE=LOW). IOH/IOL = ±24 mA.
8 A7 bidirectional Channel 7 A-side data I/O. Acts as input when DIR=LOW, output when DIR=HIGH (and OE=LOW). IOH/IOL = ±24 mA.
9 A8 bidirectional Channel 8 A-side data I/O. Acts as input when DIR=LOW, output when DIR=HIGH (and OE=LOW). IOH/IOL = ±24 mA.
10 GND power_in Ground reference (0 V). Connect to system ground with a low-impedance path; use a local decoupling capacitor between VCC (pin 20) and GND.
11 B8 bidirectional Channel 8 B-side data I/O. Acts as input when DIR=HIGH, output when DIR=LOW (and OE=LOW). IOH/IOL = ±24 mA.
12 B7 bidirectional Channel 7 B-side data I/O. Acts as input when DIR=HIGH, output when DIR=LOW (and OE=LOW). IOH/IOL = ±24 mA.
13 B6 bidirectional Channel 6 B-side data I/O. Acts as input when DIR=HIGH, output when DIR=LOW (and OE=LOW). IOH/IOL = ±24 mA.
14 B5 bidirectional Channel 5 B-side data I/O. Acts as input when DIR=HIGH, output when DIR=LOW (and OE=LOW). IOH/IOL = ±24 mA.
15 B4 bidirectional Channel 4 B-side data I/O. Acts as input when DIR=HIGH, output when DIR=LOW (and OE=LOW). IOH/IOL = ±24 mA.
16 B3 bidirectional Channel 3 B-side data I/O. Acts as input when DIR=HIGH, output when DIR=LOW (and OE=LOW). IOH/IOL = ±24 mA.
17 B2 bidirectional Channel 2 B-side data I/O. Acts as input when DIR=HIGH, output when DIR=LOW (and OE=LOW). IOH/IOL = ±24 mA.
18 B1 bidirectional Channel 1 B-side data I/O. Acts as input when DIR=HIGH, output when DIR=LOW (and OE=LOW). IOH/IOL = ±24 mA.
19 OE input Output Enable, active LOW. When LOW, transceiver is enabled in the direction set by DIR; when HIGH, both A and B ports are placed in high-impedance (3-state).
20 VCC power_in Positive supply voltage input. Operating range 4.5 V to 5.5 V. Bypass locally to GND with a 0.1 µF ceramic capacitor.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package TSSOP-20
Category Logic
Pins 20

Ordering variants

Same part, different packaging or reel option.

  • SN74ACT245PWR
  • SN74ACT245PWRDB
  • SN74ACT245PWRDGS
  • SN74ACT245PWRDW
  • SN74ACT245PWRN
  • SN74ACT245PWRNS
  • SN74ACT245PWRRKS

CAD (KiCad official)

  • Symbol: SN74ACT245PWR
  • Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
  • 3D model: TSSOP-20 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
sn74act245pwr.step 267 KB You want the bare part, or you mark your own boards.
sn74act245pwr-etched.step 2.9 MB You want the part with SN74ACT245PWR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 741 faces against 327 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

  • Datasheet: Texas Instruments datasheet (41 pp, sha256 cb5e20199f4295c7, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF