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PCA9306DCTR

Dual bidirectional I2C level translator, 1.0-5.0V, auto-sense, VSSOP-8

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Manufacturer Part：

PCA9306DCTR

Package：

VSSOP-8 (DCU) (2.3 × 2.0 × 0.9 mm)

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Description

Product Overview

The PCA9306DCTR from Texas Instruments is a dual bidirectional I2C bus and SMBus voltage-level translator in an 8-pin VSSOP (DCU) package. It enables seamless communication between devices operating at different voltage levels (1.0 V to 5.0 V on either side) without requiring a direction control signal, making it the simplest solution for mixed-voltage I2C system design.

Key Specifications

VREF1 Range 1.0 V to 5.0 V
VREF2 Range 1.8 V to 5.0 V
Data Rate Up to 400 kHz (I2C Fast-mode)
Channels 2 (SDA, SCL)
Direction Control None required (bidirectional auto-sensing)
Quiescent Current 3 µA typ
EN Input Active high, defaults to off when floating
Operating Temperature -40°C to +85°C
Package VSSOP-8 (DCU) (2.3 × 2.0 × 0.9 mm)

Features

  • True bidirectional voltage translation without direction pin
  • Open-drain I2C/SMBus compatible
  • 1.0 V to 5.0 V translation range
  • Ultra-low 3 µA quiescent current
  • EN pin for device enable/disable
  • Hot-insertion tolerant (Ioff circuitry)

Applications

  • I2C bus voltage bridging
  • SMBus level translation
  • Mixed-voltage MCU peripheral interfacing
  • Portable electronics power management
  • Sensor module communication bridging

The Texas Instruments PCA9306DCTR is a dual bidirectional I2C bus and SMBus voltage-level translator that enables communication between I2C devices operating at different voltage levels without requiring a direction control signal. It translates between any voltage combination from 1.0 V to 5.0 V on side 1 and 1.8 V to 5.0 V on side 2, making it the simplest and most compact solution for mixed-voltage I2C system integration. The device uses open-drain pass-gate architecture that naturally supports the I2C bidirectional protocol, with 3 µA typical quiescent current ideal for battery-powered applications. An enable (EN) pin allows the translator to be disabled, isolating the two bus segments.

The PCA9306 uses an open-drain pass-FET architecture specifically designed for I2C bidirectional translation. Each channel (SDA, SCL) contains a pass transistor that connects the two voltage domains. When a device on side 1 pulls the line low, the pass transistor conducts and the low level is reflected on side 2. When the line is released, passive pull-up resistors on each side restore the high level to their respective VREF voltages. VREF1 sets the logic high level for side 1, and VREF2 sets the logic high level for side 2. No direction control is needed because the I2C protocol is inherently open-drain and bidirectional. The EN pin controls the pass transistors; when EN is low, both channels are high-impedance, isolating the buses.

Pin Name Description
1 VREF1 Reference Voltage 1 (1.0-5.0 V)
2 SCL1 I2C Clock Side 1
3 SDA1 I2C Data Side 1
4 GND Ground
5 SDA2 I2C Data Side 2
6 SCL2 I2C Clock Side 2
7 VREF2 Reference Voltage 2 (1.8-5.0 V)
8 EN Enable Input (Active High)
  • I2C Voltage Bridging: Connect 1.8 V MCU I2C bus to 3.3 V or 5 V sensor peripherals without direction control complexity
  • SMBus Level Translation: Battery gauge IC communication between 3.3 V host and 5 V SMBus in server and laptop systems
  • Sensor Module Interfacing: Bridge voltage domain gap between low-power MCU and 5 V I2C environmental sensors
  • Portable Electronics: 3 µA quiescent current enables I2C bus bridging in always-on battery-powered subsystems
  • Hot-Insertion Systems: Ioff circuitry prevents backflow current during partial power-down in modular I2C backplanes
Model Brand Channels Voltage Range Package
TXS0102DCTR TI 2 1.65-3.6/2.3-5.5 VSSOP-8
PCA9306DCUR TI 2 1.0-5.0/1.8-5.0 VSSOP-8
NCA9306DTR2G onsemi 2 1.0-5.0/1.8-5.0 TSOP-6
FXMA2102UMX Fairchild 2 1.65-3.6 MicroPak
SN74LVC1T45DCKR TI 1 1.65-5.5 SC-70
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