The TCA9846 is a quad bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register.
An active-low reset (RESET) input allows the TCA9846 to recover from a situation in which one of the downstream I2C buses is stuck in a low state. Pulling RESET low resets the I2C state machine and causes all the channels to be deselected, as does the internal power-on reset function.
The pass gates of the switches are constructed so that VDD1/VDD2 pins can be used to limit the maximum high voltage, which is passed by the TCA9846. Limiting the maximum high voltage allows the use of different bus voltages on each pair, so that 0.65V, 0.8V, 1.2V, or 1.8V parts can communicate with 3.3V parts, without any additional protection. External pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 3.6V tolerant.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | TCA9846 Ultra Low-Voltage 4-Channel 1MHz Capable I2 C Switch datasheet (Rev. A) | PDF | HTML | May 6, 2026 |
| Application note | Multiplexer/Switch Solutions for Fast Mode Plus I2C Applications | PDF | HTML | Jan 14, 2026 |
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The TCA984649-EVM is used to evaluate the performance of the TCA9846 and TCA9849. The evaluation module (EVM) does not come with a soldered unit. A sample can be ordered online at the bottom of the product page. The EVM allows for engineers to evaluate the TCA9846 and TCA9849 I2C signaling (...)
The TMUX-24PW-EVM evaluation module allows for the quick prototyping and DC characterization of the TI line of TMUX products that use 16-, 20- or 24-pin TSSOP packages (PW) and is rated for high-voltage operation.
The TMUXBQB-DYYEVM allows for the quick prototyping and DC characterization of our line of TMUX products that use the 16-pin TSSOP (PW), WQFN (BQB) and SOT-23 THIN (DYY) packages.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| TSSOP (PW) | 16 | Ultra Librarian |
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