TCA9517DR from Texas Instruments, in a SOIC-8. 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-side supply voltage (0.9 V to 5.5 V). Provides the 0.3 x VCCA reference to the A-side input comparators and powers the power-good-detect circuit.
2	SCLA	bidirectional	Serial clock bus, A-side. Open-drain I/O; connect to VCCA through a pull-up resistor. If unused, connect directly to ground.
3	SDAA	bidirectional	Serial data bus, A-side. Open-drain I/O; connect to VCCA through a pull-up resistor. If unused, connect directly to ground.
4	GND	power_in	Device ground reference.
5	EN	input	Active-high repeater enable input. VIH = 0.7 x VCCB min, VIL = 0.3 x VCCB max. Drive high to enable bidirectional buffering between A and B sides.
6	SDAB	bidirectional	Serial data bus, B-side. Open-drain I/O; connect to VCCB through a pull-up resistor. If unused, connect directly to ground.
7	SCLB	bidirectional	Serial clock bus, B-side. Open-drain I/O; connect to VCCB through a pull-up resistor. If unused, connect directly to ground.
8	VCCB	power_in	B-side and device supply voltage (2.7 V to 5.5 V). Powers the TCA9517 logic and all internal I/O drivers.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-8
Category	Logic
Pins	8

Ordering variants

Same part, different packaging or reel option.

TCA9517DR
TCA9517DRD
TCA9517DRDGKR
TCA9517DRDGK

CAD (KiCad official)

Symbol: TCA9517DR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Texas Instruments datasheet (28 pp, sha256 fde93fd601168d6f, 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