The TXS0108E 8-Channel Bi-Directional Logic Level Converter Module is a high-speed, full-duplex voltage translation board built around Texas Instruments’ TXS0108E IC — the industry-standard solution for safely interfacing microcontrollers, sensors, and peripherals that operate at different logic voltage levels without risking damage to 3.3V devices from 5V signals or vice versa.

Unlike simpler resistor-divider or MOSFET-based level shifters, the TXS0108E uses a pass-gate architecture with integrated one-shot edge-rate accelerator circuits that detect signal direction automatically — no direction control pin or enable toggling required. This makes it genuinely full-duplex and truly bi-directional on all eight channels simultaneously, with the IC sensing and responding to signal transitions in both directions at up to 110Mbps for push-pull (UART, SPI, GPIO) applications and up to 1.2Mbps for open-drain (I²C) signals. Internal smart pull-up resistors on both sides provide DC bias and drive capability without requiring external pull-ups in most configurations.

The A-side port (VCCA) accepts supply voltages from 1.2V to 3.6V — connect your 3.3V or 1.8V logic devices here. The B-side port (VCCB) accepts 1.65V to 5.5V — connect your 5V logic devices here. An OE (output enable) pin places all outputs in high-impedance state when pulled LOW, enabling bus sharing and power-sequencing management. Partial power-down protection ensures all outputs go Hi-Z if either supply rail drops to ground, preventing back-powering. Compatible with Arduino (5V), ESP32 (3.3V), Raspberry Pi (3.3V), STM32, and virtually any mixed-voltage embedded system. Ideal for UART, SPI, I²C, SD card, GPIO, and 8-bit data bus translation.

Specification:

Translator IC : TXS0108E
Number of Channels : 8 (fully independent, all bi-directional)
Direction Sensing : Automatic (no direction-control pin required)
VCCA (Side A — low voltage) : 1.2V – 3.6V
VCCB (Side B — high voltage) : 1.65V – 5.5V
Typical Use : VCCA = 3.3V (A side), VCCB = 5V (B side)
Max Data Rate (Push-Pull) : 110Mbps
Max Data Rate (Open-Drain) : 1.2Mbps
Output Type : Push-pull and open-drain compatible
Output Enable Pin : OE (active HIGH — LOW = all outputs Hi-Z)
Internal Pull-Up Resistors : Yes (smart dynamic pull-up/pull-down)
Partial Power-Down Protection : Yes (outputs Hi-Z if either VCC = GND)
Compatible Protocols : UART, SPI, I²C, GPIO, SD card, 8-bit data buses
Pin Pitch : 2.54mm (0.1 inch) — breadboard compatible
PCB Dimensions : ~28 × 13mm (approx.)
Pin Count : 20 (10 per side)
Compatible Boards : Arduino, ESP32, Raspberry Pi, STM32, PIC, BeagleBone
Note : VCCA must be ≤ VCCB at all times; OE pin must be tied HIGH to enable outputs
Package Includes : 1 × TXS0108E 8-Channel Logic Level Converter Module