SN74LVC4245APWR from Texas Instruments, in a TSSOP-24. 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	Power supply for A side. Recommended 4.5V to 5.5V; absolute max 6.5V. Bypass with 100nF close to the pin.
2	DIR	input	Direction control input, referenced to VCCA. DIR=H drives A→B; DIR=L drives B→A. VIH≥2V, VIL≤0.8V.
3	A1	bidirectional	A-port transceiver I/O bit 1, referenced to VCCA. Drives ±24mA at 5V VCCA; input tolerant to VCCA+0.5V.
4	A2	bidirectional	A-port transceiver I/O bit 2, referenced to VCCA.
5	A3	bidirectional	A-port transceiver I/O bit 3, referenced to VCCA.
6	A4	bidirectional	A-port transceiver I/O bit 4, referenced to VCCA.
7	A5	bidirectional	A-port transceiver I/O bit 5, referenced to VCCA.
8	A6	bidirectional	A-port transceiver I/O bit 6, referenced to VCCA.
9	A7	bidirectional	A-port transceiver I/O bit 7, referenced to VCCA.
10	A8	bidirectional	A-port transceiver I/O bit 8, referenced to VCCA.
11	GND	power_in	Device ground. Tie all GND pins (11, 12, 13) to a common low-impedance ground plane.
12	GND	power_in	Device ground.
13	GND	power_in	Device ground.
14	B8	bidirectional	B-port transceiver I/O bit 8, referenced to VCCB. Drives ±24mA at VCCB=3V; input tolerant to VCCB+0.5V.
15	B7	bidirectional	B-port transceiver I/O bit 7, referenced to VCCB.
16	B6	bidirectional	B-port transceiver I/O bit 6, referenced to VCCB.
17	B5	bidirectional	B-port transceiver I/O bit 5, referenced to VCCB.
18	B4	bidirectional	B-port transceiver I/O bit 4, referenced to VCCB.
19	B3	bidirectional	B-port transceiver I/O bit 3, referenced to VCCB.
20	B2	bidirectional	B-port transceiver I/O bit 2, referenced to VCCB.
21	B1	bidirectional	B-port transceiver I/O bit 1, referenced to VCCB.
22	OE	input	Active-low output-enable input, referenced to VCCA. OE=L enables the transceiver outputs; OE=H places both A- and B-port I/Os in high-impedance.
23	VCCB	power_in	Power supply for B side. Pin diagram shows 'NC,VCCB' - Pin Functions table lists this pin as VCCB (2.7V to 3.6V recommended); it may be left NC only if pin 24 is used as the sole VCCB tie.
24	VCCB	power_in	Power supply for B side. Recommended 2.7V to 3.6V; absolute max 4.6V. Bypass with 100nF close to the pin.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	TSSOP-24
Category	Logic
Pins	24

Ordering variants

Same part, different packaging or reel option.

SN74LVC4245APWR
SN74LVC4245APWRDB
SN74LVC4245APWRDBR
SN74LVC4245APWRDW
SN74LVC4245APWRDWR

CAD (KiCad official)

Symbol: SN74LVC4245APWR
Footprint: Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm
3D model: TSSOP-24 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sn74lvc4245apwr.step`	315 KB	You want the bare part, or you mark your own boards.
`sn74lvc4245apwr-etched.step`	3.3 MB	You want the part with `SN74LVC4245APWR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 838 faces against 387 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 (28 pp, sha256 29a63cd196f43f2b, 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