component
PCA9306
Public Made by Adomby adom
TI dual bidirectional I2C/SMBus voltage-level translator, VSSOP-8. 1.0-3.6 V to 1.8-5.5 V, no direction pin. Datasheet-verified.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownPCA9306
Texas Instruments · I2C level translator · VSSOP-8
Translates the two lines of an I2C or SMBus bus between a lower and a higher voltage domain, so a 1.8 or 3.3 V controller talks to 5 V devices on the same bus. Each channel is a pass transistor with no direction control, so it handles the open-drain, bidirectional traffic automatically, and the two VREF pins set the levels for each side. An EN pin isolates the buses when low. A tiny, standard fix for mixed-voltage I2C.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground, 0 V reference for the device. |
| 2 | VREF1 | power_in | Low-voltage-side reference supply voltage for SCL1 and SDA1. Recommended operating range 0 V to 5.5 V; supports translation from 1.2 V up to (VREF2 - 0.6 V). |
| 3 | SCL1 | bidirectional | Serial clock, low-voltage side. Open-drain I2C/SMBus clock line referenced to VREF1. High-impedance when EN is low. |
| 4 | SDA1 | bidirectional | Serial data, low-voltage side. Open-drain I2C/SMBus data line referenced to VREF1. High-impedance when EN is low. |
| 5 | SDA2 | bidirectional | Serial data, high-voltage side. Open-drain I2C/SMBus data line referenced to VREF2. High-impedance when EN is low. |
| 6 | SCL2 | bidirectional | Serial clock, high-voltage side. Open-drain I2C/SMBus clock line referenced to VREF2. High-impedance when EN is low. |
| 7 | VREF2 | power_in | High-voltage-side reference supply voltage for SCL2 and SDA2. Recommended operating range 0 V to 5.5 V; must be between VREF1 + 0.6 V and 5.5 V for translation. |
| 8 | EN | input | Switch enable input. When high, the translator switch is ON and SCL1/SDA1 connect to SCL2/SDA2. When low, the switch is off and all I/Os are high-impedance (also isolates the bus, e.g. a 400-kHz bus from a 100-kHz bus). |
Key specifications
| Parameter | Value |
|---|---|
| Type | Dual bidirectional I2C/SMBus level translator |
| Low side | 1.0-3.6 V |
| High side | 1.8-5.5 V |
| Channels | 2 (SCL, SDA) |
| Direction control | None (pass-transistor) |
| Enable | EN pin isolates buses |
| Package | VSSOP-8 |
Ordering variants
Same part, different packaging or reel option.
PCA9306DCUR (VSSOP-8, tape & reel)PCA9306DCUT (VSSOP-8, small reel)PCA9306DQER (X2SON-8)
CAD (KiCad official)
- Symbol:
Interface:PCA9306 (KiCad official) - Footprint:
Package_SO:VSSOP-8_2.3x2mm_P0.5mm - 3D model: VSSOP-8 (KiCad packages3D, STEP)
- 3D model files:
pca9306-etched.step/pca9306-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);pca9306.step/pca9306.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (38 pp, sha256
1cd97c734729f2bf, 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).