SN74LVC245APWR 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. When high, signal propagates from A port to B port. When low, signal propagates from B port to A port. CMOS logic input referenced to VCC (1.65 V to 3.6 V); accepts up to 5.5 V.
2	A1	tri_state	Transceiver I/O pin, channel 1 A-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low). IOH up to -24 mA / IOL up to 24 mA at VCC = 3 V.
3	A2	tri_state	Transceiver I/O pin, channel 2 A-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
4	A3	tri_state	Transceiver I/O pin, channel 3 A-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
5	A4	tri_state	Transceiver I/O pin, channel 4 A-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
6	A5	tri_state	Transceiver I/O pin, channel 5 A-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
7	A6	tri_state	Transceiver I/O pin, channel 6 A-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
8	A7	tri_state	Transceiver I/O pin, channel 7 A-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
9	A8	tri_state	Transceiver I/O pin, channel 8 A-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
10	GND	power_in	Ground reference (0 V). Connect to the system ground plane.
11	B8	tri_state	Transceiver I/O pin, channel 8 B-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
12	B7	tri_state	Transceiver I/O pin, channel 7 B-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
13	B6	tri_state	Transceiver I/O pin, channel 6 B-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
14	B5	tri_state	Transceiver I/O pin, channel 5 B-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
15	B4	tri_state	Transceiver I/O pin, channel 4 B-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
16	B3	tri_state	Transceiver I/O pin, channel 3 B-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
17	B2	tri_state	Transceiver I/O pin, channel 2 B-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
18	B1	tri_state	Transceiver I/O pin, channel 1 B-side. Bidirectional 3-state I/O; direction set by DIR, enabled by OE (active-low).
19	OE	input	Output enable, active-low. When low, all outputs are enabled per DIR. When high, all A and B outputs are placed in the high-impedance (3-state) state. Accepts up to 5.5 V.
20	VCC	power_in	Supply voltage. Operating range 1.65 V to 3.6 V; absolute maximum 6.5 V. Decouple with ceramic bypass capacitor(s) to GND.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SN74LVC245APWR
SN74LVC245APWRDB
SN74LVC245APWRDGV
SN74LVC245APWRDW
SN74LVC245APWRN
SN74LVC245APWRNS
SN74LVC245APWRRGY
SN74LVC245APWRGQN
SN74LVC245APWRZQN

CAD (KiCad official)

Symbol: SN74LVC245APWR
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
`sn74lvc245apwr.step`	267 KB	You want the bare part, or you mark your own boards.
`sn74lvc245apwr-etched.step`	2.9 MB	You want the part with `SN74LVC245APWR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 754 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 (35 pp, sha256 f8c28b30ab2bf1a0, 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