74HCT245PW from Nexperia, 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. LOW = data flows B→A (B ports are inputs, A ports are outputs); HIGH = data flows A→B (A ports are inputs, B ports are outputs). TTL-level input.
2	A0	bidirectional	Bidirectional data I/O bit 0 on the A-side bus. Acts as input or 3-state output depending on DIR and OE.
3	A1	bidirectional	Bidirectional data I/O bit 1 on the A-side bus.
4	A2	bidirectional	Bidirectional data I/O bit 2 on the A-side bus.
5	A3	bidirectional	Bidirectional data I/O bit 3 on the A-side bus.
6	A4	bidirectional	Bidirectional data I/O bit 4 on the A-side bus.
7	A5	bidirectional	Bidirectional data I/O bit 5 on the A-side bus.
8	A6	bidirectional	Bidirectional data I/O bit 6 on the A-side bus.
9	A7	bidirectional	Bidirectional data I/O bit 7 on the A-side bus.
10	GND	power_in	Ground reference (0 V). Connect to system ground.
11	B7	bidirectional	Bidirectional data I/O bit 7 on the B-side bus.
12	B6	bidirectional	Bidirectional data I/O bit 6 on the B-side bus.
13	B5	bidirectional	Bidirectional data I/O bit 5 on the B-side bus.
14	B4	bidirectional	Bidirectional data I/O bit 4 on the B-side bus.
15	B3	bidirectional	Bidirectional data I/O bit 3 on the B-side bus.
16	B2	bidirectional	Bidirectional data I/O bit 2 on the B-side bus.
17	B1	bidirectional	Bidirectional data I/O bit 1 on the B-side bus.
18	B0	bidirectional	Bidirectional data I/O bit 0 on the B-side bus.
19	OE	input	Output enable, active LOW. LOW enables the transceiver in the direction set by DIR; HIGH places both A and B ports in high-impedance (3-state) OFF condition.
20	VCC	power_in	Positive supply voltage. Recommended operating range 4.5 V to 5.5 V for 74HCT245 (TTL-input variant); absolute max 7 V. Decouple with a 100 nF ceramic capacitor to GND close to the pin.

Key specifications

Parameter	Value
Manufacturer	Nexperia
Package	TSSOP-20
Category	Logic
Pins	20

Ordering variants

74HCT245PW
74HCT245PWD
74HCT245PWBQ

CAD (KiCad official)

Symbol: 74HCT245PW
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
`74hct245pw.step`	267 KB	You want the bare part, or you mark your own boards.
`74hct245pw-etched.step`	2.3 MB	You want the part with `74HCT245PW` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 610 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: Nexperia datasheet (15 pp, sha256 ff2562c806a0fc87, 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