TCA39306DCUR from Texas Instruments, in a VSSOP-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	GND	power_in	Ground reference, 0 V. Common return for both reference rails and internal logic.
2	VREF1	power_in	Low-side reference supply for SCL1/SDA1. Recommended operating range 0 V to 5.5 V; supports translation down to 0.85 V (must be at least VREF2 - 0.6 V).
3	SCL1	bidirectional	Low-voltage side serial clock line of the I2C/SMBus/I3C bus. Open-drain pass-gate connection to SCL2 when EN is high.
4	SDA1	bidirectional	Low-voltage side serial data line of the I2C/SMBus/I3C bus. Open-drain pass-gate connection to SDA2 when EN is high.
5	SDA2	bidirectional	High-voltage side serial data line of the I2C/SMBus/I3C bus. Open-drain pass-gate connection to SDA1 when EN is high.
6	SCL2	bidirectional	High-voltage side serial clock line of the I2C/SMBus/I3C bus. Open-drain pass-gate connection to SCL1 when EN is high.
7	VREF2	power_in	High-side reference supply for SCL2/SDA2. Recommended operating range 0 V to 5.5 V (must be at least VREF1 + 0.6 V).
8	EN	input	Switch enable input. Drive high (>=1.5 V, up to 5.5 V) to connect SCL1<->SCL2 and SDA1<->SDA2 through the pass-gate switches; drive low to isolate the two sides in a high-impedance state. Typically tied to VREF2 through a 200 kOhm pull-up.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

TCA39306DCUR
TCA39306DCURDDF
TCA39306DCURDTM

CAD (KiCad official)

Symbol: TCA39306DCUR
Footprint: Package_SO:VSSOP-8_2.3x2mm_P0.5mm
3D model: VSSOP-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Texas Instruments datasheet (28 pp, sha256 952449a0d65e2f3b, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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