SN74AHCT245PWR 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. DIR=L transfers B->A; DIR=H transfers A->B (when OE is low).
2	A1	bidirectional	Channel 1 A-side bus I/O. Direction set by DIR; high-Z when OE is high.
3	A2	bidirectional	Channel 2 A-side bus I/O.
4	A3	bidirectional	Channel 3 A-side bus I/O.
5	A4	bidirectional	Channel 4 A-side bus I/O.
6	A5	bidirectional	Channel 5 A-side bus I/O.
7	A6	bidirectional	Channel 6 A-side bus I/O.
8	A7	bidirectional	Channel 7 A-side bus I/O.
9	A8	bidirectional	Channel 8 A-side bus I/O.
10	GND	power_in	Ground reference (0 V).
11	B8	bidirectional	Channel 8 B-side bus I/O.
12	B7	bidirectional	Channel 7 B-side bus I/O.
13	B6	bidirectional	Channel 6 B-side bus I/O.
14	B5	bidirectional	Channel 5 B-side bus I/O.
15	B4	bidirectional	Channel 4 B-side bus I/O.
16	B3	bidirectional	Channel 3 B-side bus I/O.
17	B2	bidirectional	Channel 2 B-side bus I/O.
18	B1	bidirectional	Channel 1 B-side bus I/O.
19	OE	input	Active-low output enable. When OE is high, both A and B buses are placed in the high-impedance (isolation) state. Should be tied to VCC through a pullup during power up/down.
20	VCC	power_in	Positive supply, 4.5 V to 5.5 V recommended (7 V absolute max).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SN74AHCT245PWR
SN74AHCT245PWRDB
SN74AHCT245PWRDBR
SN74AHCT245PWRDGV
SN74AHCT245PWRDGVR
SN74AHCT245PWRDW
SN74AHCT245PWRDWR
SN74AHCT245PWRN
SN74AHCT245PWRNS
SN74AHCT245PWRNSR
SN74AHCT245PWRDGS
SN74AHCT245PWRDGSR
SN74AHCT245PWRRGY
SN74AHCT245PWRRGYR
SN74AHCT245PWRRKS
SN74AHCT245PWRRKSR
SN74AHCT245PWRJ
SN74AHCT245PWRW
SN74AHCT245PWRFK

CAD (KiCad official)

Symbol: SN74AHCT245PWR
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
`sn74ahct245pwr.step`	267 KB	You want the bare part, or you mark your own boards.
`sn74ahct245pwr-etched.step`	3.0 MB	You want the part with `SN74AHCT245PWR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 768 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 (44 pp, sha256 9e7c1b200cdefd3d, 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