TCA9517ADGKR from Texas Instruments, in a VSSOP-8-0.65mm. 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 (0.9V to 5.5V). Used only to generate the 0.3xVCCA reference for the A-side input comparators and the power-good-detect; device logic and I/Os are powered by VCCB.
2	SCLA	bidirectional	Serial clock bus, A-side (low-voltage side). Open-drain; connect to VCCA through a pull-up resistor. If unused, tie directly to ground.
3	SDAA	bidirectional	Serial data bus, A-side (low-voltage side). Open-drain; connect to VCCA through a pull-up resistor. If unused, tie directly to ground.
4	GND	power_in	Device ground reference.
5	EN	input	Active-high repeater enable input. Logic thresholds referenced to VCCB (VIH >= 0.7xVCCB, VIL <= 0.3xVCCB); 5.5V tolerant.
6	SDAB	bidirectional	Serial data bus, B-side (high-voltage side, 2.7V-5.5V). Open-drain; connect to VCCB through a pull-up resistor. If unused, tie directly to ground.
7	SCLB	bidirectional	Serial clock bus, B-side (high-voltage side, 2.7V-5.5V). Open-drain; connect to VCCB through a pull-up resistor. If unused, tie directly to ground.
8	VCCB	power_in	B-side and device supply voltage (2.7V to 5.5V). Powers all internal logic and I/Os; the B-side pull-ups and EN input thresholds are referenced to this rail.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	VSSOP-8-0.65mm
Category	Logic
Pins	8

Ordering variants

Same part, different packaging or reel option.

TCA9517ADGKR

CAD (KiCad official)

Symbol: TCA9517ADGKR
Footprint: Package_SO:VSSOP-8_2.3x2mm_P0.5mm
3D model: VSSOP-8-0.65mm (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`tca9517adgkr.step`	122 KB	You want the bare part, or you mark your own boards.
`tca9517adgkr-etched.step`	2.1 MB	You want the part with `TCA9517ADGKR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 540 faces against 147 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 (31 pp, sha256 ad2d7dc599458300, 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