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TXB0108PWRG4

TITXB0108PWRG4

Texas Instruments
Voltage Level Translator Bidirectional 1 Circuit 8 Channel 100Mbps 20-TSSOP
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Overview

The TXB0108PWRG4 is an 8-bit, bidirectional voltage level translator that utilizes auto-direction sensing to eliminate the need for a direction-control signal. It supports a wide voltage range from 1.2V to 3.6V on the A-port and 1.65V to 5.5V on the B-port, making it ideal for bridging low-voltage processors with higher-voltage peripherals. The device features VCC isolation and partial-power-down mode to prevent backflow current when an input supply is disabled.

Why Choose This Part

The primary advantage is the auto-direction sensing capability, which simplifies PCB routing and reduces GPIO count by removing the requirement for a DIR pin. It offers high-speed performance up to 100Mbps and includes ESD protection that exceeds standard industry requirements. Additionally, the partial-power-down feature ensures system reliability by isolating I/Os when one of the power supplies is off.

Applications

I/O Level Shifting
Interfacing 1.8V or 2.5V microcontrollers with 3.3V or 5V sensors and actuators.
SD Card Interfacing
Translating logic levels between low-voltage SD card controllers and standard 3.3V memory cards.
Smartphone and Tablet Integration
Managing signal levels between the application processor and peripheral modules in mobile designs.
Legacy Peripheral Support
Connecting modern low-voltage SoC platforms to legacy 5V logic devices.

Key Specifications

Features Auto-Direction Sensing
Data Rate 100Mbps
Output Type Tri-State, Non-Inverted
Channel Type Bidirectional
Mounting Type Surface Mount
Package / Case 20-TSSOP (0.173", 4.40mm Width)
Voltage - VCCA 1.2 V ~ 3.6 V
Voltage - VCCB 1.65 V ~ 5.5 V
Translator Type Voltage Level
Number of Circuits 1
Channels per Circuit 8
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 20-TSSOP

Getting Started

When designing with the TXB0108, ensure that the A-port voltage (VCCA) is always less than or equal to the B-port voltage (VCCB). Because this device uses a weak buffer for auto-direction sensing, avoid using pull-up or pull-down resistors smaller than 50k ohms on the I/O lines as they may interfere with state changes. For evaluation, use the TXB0108EVM development module to test signal integrity across different voltage domains.

Part of TXB0108 level shifters family » TXB0108

TXB0108 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Package Stock
TXB0108PWRG4 (this part) TSSOP-20 960
TXB0108DQSR UFDFN-20 1,114
TXB0108RGYR VFQFN-20 —
TXB0108PWR TSSOP-20 32,666

Also Consider

TXS0108EPWR TITexas Instruments - Recommended if your application uses open-drain protocols like I2C, as the TXS series is optimized for those environments.
SN74AVC8T245PWR TITexas Instruments - A better choice if higher drive strength or explicit direction control is required for long PCB traces.