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SN74HCT245PWR

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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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SN74HCT245PWR

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

SN74HCT245PWR 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 select input. High = A to B, Low = B to A. TTL-compatible input (VIH ≥ 2 V, VIL ≤ 0.8 V).
2 A1 bidirectional Channel 1 port A. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high. ±6 mA drive at 5 V.
3 A2 bidirectional Channel 2 port A. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
4 A3 bidirectional Channel 3 port A. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
5 A4 bidirectional Channel 4 port A. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
6 A5 bidirectional Channel 5 port A. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
7 A6 bidirectional Channel 6 port A. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
8 A7 bidirectional Channel 7 port A. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
9 A8 bidirectional Channel 8 port A. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
10 GND power_in Ground reference (0 V). Center-pin placement helps minimize high-speed switching noise.
11 B8 bidirectional Channel 8 port B. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
12 B7 bidirectional Channel 7 port B. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
13 B6 bidirectional Channel 6 port B. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
14 B5 bidirectional Channel 5 port B. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
15 B4 bidirectional Channel 4 port B. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
16 B3 bidirectional Channel 3 port B. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
17 B2 bidirectional Channel 2 port B. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
18 B1 bidirectional Channel 1 port B. Bidirectional bus I/O; direction set by DIR, tri-state when OE is high.
19 OE input Output enable, active low. High = all ports in high-impedance (isolation) mode; Low = all ports active. TTL-compatible input.
20 VCC power_in Positive supply voltage. Recommended 4.5 V to 5.5 V (nominal 5 V). Absolute max 7 V.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • SN74HCT245PWR
  • SN74HCT245PWRDW
  • SN74HCT245PWRDWR
  • SN74HCT245PWRN
  • SN74HCT245PWRNE
  • SN74HCT245PWRNS
  • SN74HCT245PWRNSR
  • SN74HCT245PWRDB
  • SN74HCT245PWRDBR
  • SN74HCT245PWRDGS
  • SN74HCT245PWRDGSR
  • SN74HCT245PWRJ
  • SN74HCT245PWRW
  • SN74HCT245PWRFK

CAD (KiCad official)

  • Symbol: SN74HCT245PWR
  • 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
sn74hct245pwr.step 267 KB You want the bare part, or you mark your own boards.
sn74hct245pwr-etched.step 2.9 MB You want the part with SN74HCT245PWR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 742 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 (38 pp, sha256 17db29398bd94ccf, 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