SN74AVC4T245PWR from Texas Instruments, in a TSSOP-16. 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	VCCA	power_in	A-port power supply. Sets the A-port I/O voltage and references the DIR and OE control inputs. Operating range 1.2V to 3.6V (absolute max 4.6V).
2	1DIR	input	Direction-control input for the '1' 2-bit port pair (1A1/1A2 <-> 1B1/1B2). HIGH sends data from A to B, LOW sends data from B to A. Referenced to VCCA.
3	2DIR	input	Direction-control input for the '2' 2-bit port pair (2A1/2A2 <-> 2B1/2B2). HIGH sends data from A to B, LOW sends data from B to A. Referenced to VCCA.
4	1A1	bidirectional	Bidirectional data I/O bit 1 of the '1' A-port. Referenced to VCCA; drives up to ~12mA at VCCA=3.3V.
5	1A2	bidirectional	Bidirectional data I/O bit 2 of the '1' A-port. Referenced to VCCA.
6	2A1	bidirectional	Bidirectional data I/O bit 1 of the '2' A-port. Referenced to VCCA.
7	2A2	bidirectional	Bidirectional data I/O bit 2 of the '2' A-port. Referenced to VCCA.
8	GND	power_in	Device ground reference. Both GND pins (8 and 9) must be tied to the system ground.
9	GND	power_in	Device ground reference. Both GND pins (8 and 9) must be tied to the system ground.
10	2B2	bidirectional	Bidirectional data I/O bit 2 of the '2' B-port. Referenced to VCCB.
11	2B1	bidirectional	Bidirectional data I/O bit 1 of the '2' B-port. Referenced to VCCB.
12	1B2	bidirectional	Bidirectional data I/O bit 2 of the '1' B-port. Referenced to VCCB.
13	1B1	bidirectional	Bidirectional data I/O bit 1 of the '1' B-port. Referenced to VCCB.
14	2OE	input	Active-LOW output enable for the '2' port pair. Pull HIGH to place 2A1/2A2/2B1/2B2 in the high-impedance (3-state) mode. Referenced to VCCA.
15	1OE	input	Active-LOW output enable for the '1' port pair. Pull HIGH to place 1A1/1A2/1B1/1B2 in the high-impedance (3-state) mode. Referenced to VCCA.
16	VCCB	power_in	B-port power supply. Sets the B-port I/O voltage. Operating range 1.2V to 3.6V (absolute max 4.6V).

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	TSSOP-16
Category	Logic
Pins	16

Ordering variants

Same part, different packaging or reel option.

SN74AVC4T245PWR
SN74AVC4T245PWRD
SN74AVC4T245PWRDR
SN74AVC4T245PWRDGV
SN74AVC4T245PWRDGVR
SN74AVC4T245PWRRGY
SN74AVC4T245PWRRGYR
SN74AVC4T245PWRBQB
SN74AVC4T245PWRBQBR
SN74AVC4T245PWRWBQB
SN74AVC4T245PWRRSV
SN74AVC4T245PWRRSVR
SN74AVC4T245PWRDYY
SN74AVC4T245PWRDYYR

CAD (KiCad official)

Symbol: SN74AVC4T245PWR
Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
3D model: TSSOP-16 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sn74avc4t245pwr.step`	205 KB	You want the bare part, or you mark your own boards.
`sn74avc4t245pwr-etched.step`	2.8 MB	You want the part with `SN74AVC4T245PWR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 726 faces against 255 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 (46 pp, sha256 218e7e3a60f567bb, 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