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Description: This is a breakout board for the Texas Instruments TXB0104 module. The TXB0104 is a 4-bit bidirectional voltage-level translator with automatic direction sensing. 

This 4-bit noninverting translator uses two separate configurable power-supply rails. The A port is designed to track VCCA. VCCA accepts any supply voltage from 1.2V to 3.6V. The B port is designed to track VCCB. VCCB accepts any supply voltage from 1.65V to 5.5V. This allows for universal low-voltage bidirectional translation between any of the 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V voltage nodes. VCCA should not exceed VCCB.

We have broken out each pin on this module for you to easily access both the A and B ports.


  • 1.2V to 3.6V on A Port and 1.65V to 5.5V on B Port (VCCA ≤ VCCB)
  • VCC Isolation Feature – If Either VCC Input Is at GND, All Outputs Are in the High-Impedance State
  • OE Input Circuit Referenced to VCC
  • Low Power Consumption, 5-μA Max ICC


Comments 13 comments

  • A word of caution: read the data sheet carefully. I got bit by this IC before because I was using it to level-shift JTAG signals, which are pulled up by resistors on the target device. The value of the pull-up resistors was too low, which caused the IC to be confused about the direction of the signals.

    The datasheet recommends using 50k pull-up resistors if you need them. It is also incompatible with I2C, 1-Wire, and similar buses.

    • For I2C, I’d recommend the PCA9306 as a better solution.

      Not sure how that would work with the JTAG stuff, however.

  • Can this device be used for UART?

    • Yes, but only for low-voltage UARTs (say, 3.3V signals to 5V signals). For changing between a true RS-232 signal level UART and a low-voltage UART, check out our MAX3232 breakout board.

      • I tried to put this device in between an AVR mega(@5v) and an XBee module(@3.3v) with no luck. The 3.3v side that was connected to the DIN pin on the XBee was outputting garbage even though the corresponding pin on the 5v side was silent.

        • That should absolutely not be the case; if you’re certain that you’ve got it hooked up right (especially with respect to the rails; VccB must be the higher voltage), you may want to contact tech support and see about getting a replacement. I’ve used this board to go from 3.3V to 5V regularly.

  • Hi Is any body know Voltage-Level Translator with very low level voltage like 0.5 v to 5 and vice versa? Thank you Iman

  • Can someone tell me the difference between this and the Logic Level Converter?

    • The Logic Level converter you’ve mentioned has two bidirectional, open-drain channels by FETs, and two one-way level shift channels (HIGH-In and LOW-out) by resisters doing voltage divider. Bidirectional open-drain level shifters are (by choosing appropriate FETs) compatible with I2C bus, but it has fixed High- and Low-voltage sides. Buffer-gate type bidirectional level shifters like TX010x based ones have two sides and any side of it can be assigned to High (or Low) voltage side, though lines pulled-up may confuse the chip as supersat mentioned above and not compatible with I2C.

  • This is a great chip - easy to hookup and it just works. No slew. No hassle. I’m really glad to see that you guys made this a breakout board. One word of caution, though. The VCC Isolation feature (which places the pins in a HighZ state) works during startup only if you tie OE to ground via a pulldown. It doesn’t matter which rail powers up first, but until the VCCa rail is energized OE will continue to be held low, keeping the pins HighZ. SO - remember to connect OE to GND with a weak pulldown (10-50k), and leave the solder jumper connected.

  • One of these that can do 12V to 5v would be fantastic. Anyone know of such a chip?

    • No promises, but from quick glance it looks like Texas Instruments CD4504 might fit the bill. It really depends on what you’re trying to do with it. I2C? SPI? Supply from 5-20V. Tie SELECT to GND and you’ll have yourself a A-B CMOS translator.

    • If you don’t need bidirectional, a MAX232 might work. Made for RS232.

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