74AHCT125 - Quad Level-Shifter (3V to 5V)

Adafruit 4-channel I2C-safe Bi-directional Logic Level Converter

4-channel BSS138/FET pull-up level shifter. Good fit for I2C and slow bidirectional logic between low/high rails; not a fast buffer or load driver.

8-channel Bi-directional Logic Level Converter

TXB0108 8-channel auto-direction converter. Useful for many push-pull logic signals, but Adafruit warns it does not work well with I2C pull-up buses.

74LVC245 - Breadboard Friendly 8-bit Logic Level Shifter

74LVC245 8-bit direction-controlled buffer. Good for SPI, serial, parallel and similar one-way logic paths; not for bidirectional/pull-up buses such as I2C or 1-Wire.

TXB0104 Bi-Directional Level Shifter

TXB0104 4-channel auto-direction shifter. Similar caveat to TXB0108: good for compatible logic, not I2C or high-capacitance control lines.

Adafruit QT 5V to 3V Level Shifter Breakout - STEMMA QT / Qwiic

Connectorised I2C level shifter for using 3 V Qwiic/STEMMA QT devices from a 5 V controller. Best fit is I2C bus protection, not general GPIO/load driving.

Fermion: TXS0104E 4-Bit Level Translator (Breakout)

TXS0104E 4-bit auto-direction translator. DFRobot positions it for I2C, UART, SPI and OneWire with separate speed limits for push-pull and open-drain use.

Fermion: TXS0108E 8-Bit Level Translator (Breakout)

TXS0108E 8-bit auto-direction translator. More channels and higher advertised push-pull speed than TXS0104E, but still needs bus, rail and capacitance checks.

SparkFun Voltage-Level Translator Breakout - TXB0104

SparkFun TXB0104 breakout. Treat as the TXB auto-direction branch: useful for compatible logic, not a blind replacement for I2C-safe shifters.

SparkFun Logic Level Converter - Bi-Directional

SparkFun BSS138-style bidirectional converter. Good low-cost choice for stepping 5 V signals down and 3.3 V signals up on slow/bidirectional logic lines.

SparkFun Level Translator Breakout - PCA9306

PCA9306 dual bidirectional I2C/SMBus translator. A reasonable reviewed option when the problem is specifically I2C or SMBus between low and high reference voltages.

SparkFun Level Shifter - 8 Channel (TXS0108E)

SparkFun TXS0108E breakout. Supports open-drain and push-pull applications with different max data rates; verify signal type and rail range before swapping.

2-Channel Level Converter (12V to 3.3V)

2-channel optocoupler-isolated converter for 12 V field signals into 3.3 V logic. Treat as industrial signal conditioning, not a drop-in replacement for I2C/TXB/TXS logic shifters.

2-Channel Level Converter (12V to 5V)

2-channel optocoupler-isolated converter for 12 V field signals into 5 V logic. Useful when the problem is PLC/sensor-level 12 V signaling, not board-to-board 3.3 V/5 V buses.

4-Channel Level Converter (12V to 3.3V)

4-channel optocoupler-isolated 12 V to 3.3 V converter. Same industrial branch as DFR0911 with more channels; check polarity, response time and input type before substituting.

4-Channel Level Converter (12V to 5V)

4-channel optocoupler-isolated 12 V to 5 V converter. Same industrial branch as DFR0912 with more channels; not a generic bidirectional GPIO shifter.

SparkFun Logic Level Converter - Single Supply

Single-supply SparkFun logic-level and power-supply translator. Keep separate from TXB/TXS/BSS138 parts until voltage range, direction and current budget are reviewed.

4-channel I2C-safe Bi-directional Logic Level Converter

BSS138/FET-style 4-channel bidirectional level converter. Useful for I2C and slower digital signals; not a high-speed push-pull bus default.

74AHCT14 - Logic Level Inverter / Level Shifter

74AHCT14 inverter/buffer used as a one-way 3V-to-5V style logic helper when inverted outputs are acceptable. Not a bidirectional level converter.

MIKROE LLC-SPI Click

mikroBUS SPI-oriented level-converter Click board. Treat as functionally related, not a drop-in replacement for bare breakout boards.

MIKROE LLC-I2C Click

mikroBUS I2C-oriented level-converter Click board. Treat as functionally related, not a drop-in replacement for bare breakout boards.