SN74AXC4T774PWR 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	DIR1	input	Direction-control input for port 1. Logic level (referenced to VCCA) selects the data flow direction for the A1/B1 channel: A→B when high, B→A when low.
2	DIR2	input	Direction-control input for port 2. Logic level (referenced to VCCA) selects the data flow direction for the A2/B2 channel.
3	A1	bidirectional	A-port I/O for channel 1, referenced to VCCA (0.65 V to 3.6 V). Direction is set by DIR1; disabled to Hi-Z when OE is high.
4	A2	bidirectional	A-port I/O for channel 2, referenced to VCCA (0.65 V to 3.6 V). Direction is set by DIR2; disabled to Hi-Z when OE is high.
5	A3	bidirectional	A-port I/O for channel 3, referenced to VCCA (0.65 V to 3.6 V). Direction is set by DIR3; disabled to Hi-Z when OE is high.
6	A4	bidirectional	A-port I/O for channel 4, referenced to VCCA (0.65 V to 3.6 V). Direction is set by DIR4; disabled to Hi-Z when OE is high.
7	DIR3	input	Direction-control input for port 3. Logic level (referenced to VCCA) selects the data flow direction for the A3/B3 channel.
8	DIR4	input	Direction-control input for port 4. Logic level (referenced to VCCA) selects the data flow direction for the A4/B4 channel.
9	OE	input	Active-low output enable, referenced to VCCA. Drive OE high to force all A- and B-port I/Os into the high-impedance (tri-state) mode; tie to VCCA through a pull-up during power sequencing to keep outputs Hi-Z.
10	GND	power_in	Device ground reference for both supply rails.
11	B4	bidirectional	B-port I/O for channel 4, referenced to VCCB (0.65 V to 3.6 V). Direction is set by DIR4; disabled to Hi-Z when OE is high.
12	B3	bidirectional	B-port I/O for channel 3, referenced to VCCB (0.65 V to 3.6 V). Direction is set by DIR3; disabled to Hi-Z when OE is high.
13	B2	bidirectional	B-port I/O for channel 2, referenced to VCCB (0.65 V to 3.6 V). Direction is set by DIR2; disabled to Hi-Z when OE is high.
14	B1	bidirectional	B-port I/O for channel 1, referenced to VCCB (0.65 V to 3.6 V). Direction is set by DIR1; disabled to Hi-Z when OE is high.
15	VCCB	power_in	B-port power supply. Sets the reference voltage for the B-side I/Os. Recommended range 0.65 V to 3.6 V; absolute max 4.2 V. Bypass with a local decoupling capacitor to GND.
16	VCCA	power_in	A-port power supply. Sets the reference voltage for the A-side I/Os and for the DIRx / OE control inputs. Recommended range 0.65 V to 3.6 V; absolute max 4.2 V. Bypass with a local decoupling capacitor to GND.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SN74AXC4T774PWR
SN74AXC4T774PWRBQB
SN74AXC4T774PWRRSV

CAD (KiCad official)

Symbol: SN74AXC4T774PWR
Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
3D model: TSSOP-16 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Texas Instruments datasheet (43 pp, sha256 f45cd62a9675b9f6, 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