SN74LVCC4245APWR 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	A-port power supply. Recommended 4.5V to 5.5V. Also powers the control circuitry (DIR, OE). If VCCA < ~100mV, all I/O outputs are disabled and become high-impedance.
2	DIR	input	Direction control input (referenced to VCCA). DIR=High enables A->B data flow; DIR=Low enables B->A data flow. VIH/VIL referenced to VCCA.
3	A1	bidirectional	A-port bit 1. Bidirectional I/O referenced to VCCA (4.5-5.5V). Drives up to -24mA/24mA. High-Z when OE=H or when either supply is below ~100mV.
4	A2	bidirectional	A-port bit 2. Bidirectional I/O referenced to VCCA (4.5-5.5V). Drives up to -24mA/24mA. High-Z when OE=H.
5	A3	bidirectional	A-port bit 3. Bidirectional I/O referenced to VCCA (4.5-5.5V). Drives up to -24mA/24mA. High-Z when OE=H.
6	A4	bidirectional	A-port bit 4. Bidirectional I/O referenced to VCCA (4.5-5.5V). Drives up to -24mA/24mA. High-Z when OE=H.
7	A5	bidirectional	A-port bit 5. Bidirectional I/O referenced to VCCA (4.5-5.5V). Drives up to -24mA/24mA. High-Z when OE=H.
8	A6	bidirectional	A-port bit 6. Bidirectional I/O referenced to VCCA (4.5-5.5V). Drives up to -24mA/24mA. High-Z when OE=H.
9	A7	bidirectional	A-port bit 7. Bidirectional I/O referenced to VCCA (4.5-5.5V). Drives up to -24mA/24mA. High-Z when OE=H.
10	A8	bidirectional	A-port bit 8. Bidirectional I/O referenced to VCCA (4.5-5.5V). Drives up to -24mA/24mA. High-Z when OE=H.
11	GND	power_in	Device ground return. Tie to system ground; pins 11, 12, and 13 are all GND and must be connected.
12	GND	power_in	Device ground return. Tie to system ground; pins 11, 12, and 13 are all GND and must be connected.
13	GND	power_in	Device ground return. Tie to system ground; pins 11, 12, and 13 are all GND and must be connected.
14	B8	bidirectional	B-port bit 8. Bidirectional I/O referenced to VCCB (2.7-5.5V). Drives up to -24mA/24mA (at VCCB=4.5V) or -12mA/12mA (at VCCB=2.7V). High-Z when OE=H.
15	B7	bidirectional	B-port bit 7. Bidirectional I/O referenced to VCCB (2.7-5.5V). High-Z when OE=H.
16	B6	bidirectional	B-port bit 6. Bidirectional I/O referenced to VCCB (2.7-5.5V). High-Z when OE=H.
17	B5	bidirectional	B-port bit 5. Bidirectional I/O referenced to VCCB (2.7-5.5V). High-Z when OE=H.
18	B4	bidirectional	B-port bit 4. Bidirectional I/O referenced to VCCB (2.7-5.5V). High-Z when OE=H.
19	B3	bidirectional	B-port bit 3. Bidirectional I/O referenced to VCCB (2.7-5.5V). High-Z when OE=H.
20	B2	bidirectional	B-port bit 2. Bidirectional I/O referenced to VCCB (2.7-5.5V). High-Z when OE=H.
21	B1	bidirectional	B-port bit 1. Bidirectional I/O referenced to VCCB (2.7-5.5V). High-Z when OE=H.
22	OE	input	Output-enable input, active low (referenced to VCCA). OE=Low enables the transceiver; OE=High places both A and B ports in high-impedance, effectively isolating the buses.
23	NC	unconnected	No internal connection. Leave floating or tie to a plane per board convention.
24	VCCB	power_in	B-port power supply. Recommended 2.7V to 5.5V (nominal 3.3V). Sets the reference rail for B-side I/O drivers. If VCCB < ~100mV, all I/O outputs are disabled and become high-impedance.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SN74LVCC4245APWR
SN74LVCC4245APWRDB
SN74LVCC4245APWRDBR
SN74LVCC4245APWRDW
SN74LVCC4245APWRDWR
SN74LVCC4245APWRNS
SN74LVCC4245APWRNSR

CAD (KiCad official)

Symbol: SN74LVCC4245APWR
Footprint: Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm
3D model: TSSOP-24 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (32 pp, sha256 ffffd4ad7f5d4eba, 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