TMUX1308BQBR

Overview

The TMUX1308BQBR is a general-purpose CMOS multiplexer featuring an 8:1, 1-channel single-ended configuration. It operates within a wide supply voltage range of 1.62 V to 5.5 V and supports bidirectional analog and digital signals from GND to VDD. The device incorporates internal injection current control to protect switches without external components. Key electrical parameters include a maximum on-resistance (Ron) of 195 Ω at 5 V, a bandwidth up to 500 MHz, and low off-state leakage current of ±1 nA typical. It utilizes a 16-WQFN package with dimensions of 2.5 mm x 3.5 mm.

Feature Summary

• Internal injection current control eliminates the need for external diode and resistor networks.
• Back-powering protection provided by the absence of ESD diode paths to VDD.
• Fail-safe logic allows control pin voltages to be applied before the power supply.
• Break-before-make switching prevents signal path overlap during transitions.

Applications

• Analog and digital multiplexing and demultiplexing
• Diagnostics and monitoring systems
• Data center switch infrastructure
• Remote radio unit (RRU) applications

Procurement Notes

Verify the specific BQB package designation against the manufacturer's official documentation to confirm the WQFN-16 physical footprint. Ensure that the automotive grade qualification aligns with project requirements, as this suffix indicates AEC-Q100 compliance. Cross-reference the ordering part number with the latest datasheet revision to validate any potential design or marking changes.

Selection Notes

Select this component when a high-density 8:1 single-ended multiplexer is required in a compact surface-mount form factor. The 16-WQFN package offers thermal advantages over larger packages while maintaining low capacitance characteristics. Consider the 195 Ω on-resistance at 5 V for signal integrity requirements and verify that the 1.8 V logic compatibility meets the system's control interface standards.

Part Context

This device belongs to the TMUX13xx family of 5-V bidirectional multiplexers manufactured by Texas Instruments. The TMUX1308 variant specifically provides an 8:1 single-ended configuration, whereas the TMUX1309 offers a 4:1 differential setup. Both share similar architectural features but differ in channel count and signal type support.

Replacement Considerations

Public confirmed substitute part numbers are not available in the verified source material.

FAQ

How does the TMUX1308BQBR handle input signals exceeding the supply voltage?

The device features internal injection current control circuitry that allows signals on disabled paths to exceed the supply voltage without affecting the enabled signal path or damaging the switch.

What is the purpose of the fail-safe logic in this multiplexer?

Fail-safe logic ensures that voltages can be applied to the control pins (EN, A0, A1, A2) before the power supply pin is energized, protecting the device from potential damage during power-up sequences.

Does the TMUX1308BQBR have internal diode paths to the supply pin?

No, the device does not have internal diode paths to the VDD pin, which eliminates the risk of unintended power delivery to the supply rail or damage to connected components.