8-Channel Logic Level Converter 3.3V 5V TTL

8-Channel Logic Level Converter 3.3V 5V TTL is a versatile bi-directional bridge that facilitates seamless communication between microcontrollers operating at different voltage levels. Many modern sensors and microchips utilize 3.3V logic, while older systems or specific modules frequently require 5V signals. Consequently, connecting these devices directly can lead to hardware damage or erratic data transmission. This module effectively resolves these compatibility issues by safely shifting signal voltages up or down across eight independent channels. Furthermore, the board utilizes high-speed N-channel MOSFETs to ensure that data integrity remains intact even at higher switching frequencies. Therefore, you can reliably use this converter to protect your sensitive electronics while maintaining high-speed communication between diverse hardware platforms.

Key Features:

• Bi-Directional Shifting: Each of the eight channels can translate signals from high-to-low and low-to-high simultaneously without manual direction switching.
• High Channel Density: The 8-channel design allows you to manage complex interfaces like SPI, dual I²C buses, or multiple UART lines on a single compact board.
• Wide Voltage Compatibility: This module supports a broad range of logic levels, typically handling conversions between 1.8V, 3.3V, and 5V systems.
• Breadboard Friendly: Standard 2.54 mm pin spacing ensures that the module fits perfectly into prototyping breadboards or universal PCBs.
• Integrated Pull-up Resistors: The circuit includes necessary resistors to maintain stable logic states, however, you should still check your specific bus requirements for high-speed I²C.

Technical Specifications:

• High-Side Voltage (VA/VCCB): Typically 5V (Supports up to 6V maximum)
• Low-Side Voltage (VB/VCCA): Typically 3.3V (Supports down to 1.2V)
• Number of Channels: 8 Independent I/O channels
• Switch Type: N-Channel MOSFET with 10kΩ pull-up resistors
• Data Rate: Supports up to 28 Mbps (Depending on load and trace capacitance)
• Operating Temperature: −40°C to +85°C

Mechanical Specifications:

• PCB Material: High-quality FR-4 glass epoxy
• Pin Header Type: Male breakaway headers (usually included)
• Form Factor: Compact rectangular module
• Mounting: Through-hole soldering

Dimensions:

• Length: ≈ 27 mm
• Width: ≈ 26.5 mm
• Height: ≈ 12 mm (including pin headers)
• Pin Pitch: 2.54 mm (0.1 inch)

Pinout and Wiring:

• VCCA / VA: Connect this pin to the lower voltage source (e.g., 3.3V).
• VCCB / VB: Connect this pin to the higher voltage source (e.g., 5V).
• GND: Connect to the common system ground. Both sides must share this ground for proper reference.
• Ax (A1-A8): Lower voltage logic inputs/outputs corresponding to the Bx pins.
• Bx (B1-B8): Higher voltage logic inputs/outputs corresponding to the Ax pins.
• OE (Output Enable): Some models include an OE pin; pull it high to enable the level shifting logic.

Datasheet Reference:

• Download TXB0108 8-Bit Bi-directional Level Shifter Datasheet

Commonly Used in:

• Microcontroller Projects: Connecting 3.3V microcontrollers (ESP32, STM32) to 5V sensors or displays.
• Communication Bridges: Bridging mismatched voltage levels in SPI, UART, and I²C serial protocols.
• Legacy Integration: Interfacing modern low-power SOCs with older 5V TTL logic systems.

Applications:

• SD Card Interfacing: Shifting signals for SD cards which strictly require 3.3V logic levels.
• Sensor Protection: Ensuring that 5V signals from an Arduino do not fry 3.3V digital sensors.
• LCD Driving: Converting logic for 5V character or graphic LCDs from 3.3V controllers.

Equivalent Models:

• TXB0108: A popular 8-bit bi-directional voltage-level translator with auto-direction sensing.
• BSS138-Based Shifters: MOSFET-based converters that provide similar bi-directional functionality.
• 74HCT245: A common octal bus transceiver, however, it is typically uni-directional unless the DIR pin is actively controlled.

Package Includes:

• 1 x 8-Channel Logic Level Converter 3.3V 5V TTL Module
• 2 x 10-Pin Male Headers (May require soldering)