TMUX1308QDYYRQ1

Overview

The TMUX1308QDYYRQ1 is an automotive-grade, single-channel, 8:1 CMOS multiplexer in a 16-pin SOT-23-THIN package. It operates on a supply voltage range of 1.62 V to 5.5 V with a maximum on-resistance of 1700 Ω at 1.8 V and 270 Ω at 5 V. The device supports bidirectional analog and digital signals from GND to VDD, featuring low off-capacitance (14 pF typical) and a bandwidth up to 500 MHz. Key electrical characteristics include a propagation delay of 30 ns, off-isolation of -110 dB, and a maximum supply current of 3 µA.

Feature Summary

• Internal injection current control eliminates the need for external protection diodes or resistor networks.
• Back-powering protection provided by the absence of internal ESD diode paths to the VDD pin.
• Fail-safe logic circuitry allows control voltages to be applied before the power supply without damage.
• Break-before-make switching prevents signal path overlap during state transitions.

Applications

• Analog and digital multiplexing and demultiplexing
• Automotive body control modules and HVAC control systems
• Battery management systems (BMS)
• Zonal architecture and telematics units

Procurement Notes

Verify that the component meets AEC-Q100 Grade 1 specifications for the required ambient operating temperature range of –40°C to +125°C. Confirm the specific DYY package variant matches the PCB footprint requirements. Ensure the design accounts for the thermal derating characteristics associated with the exposed thermal pad in the SOT-23-THIN configuration.

Selection Notes

Select this part when a single-ended 8:1 routing solution is required within tight space constraints. The SOT-23-THIN package offers a nominal body size of 4.2 mm × 2 mm. Consider the 1.8 V logic compatibility for direct interfacing with standard microcontrollers. Verify that the bidirectional signal path capabilities align with the system's input/output voltage requirements.

Part Context

This device belongs to the TMUX13xx-Q1 family of general-purpose CMOS multiplexers. It serves as the single-channel counterpart to the dual-channel TMUX1309-Q1. Both variants share identical packaging options and core architectural features, including injection current control and fail-safe logic, ensuring consistent performance across different channel count requirements.

Replacement Considerations

The TMUX1308-Q1 is pin-compatible with industry-standard 4051 and 4851 multiplexers. Designers replacing legacy discrete solutions or older multiplexer families can utilize this component directly without modifying the board layout, provided the voltage and speed requirements are met.

FAQ

Can the TMUX1308QDYYRQ1 tolerate input signals exceeding the supply voltage?

Yes, the internal injection current control circuitry allows signals on disabled paths to exceed the supply voltage without affecting the enabled signal path, provided the injected current remains within specified limits.

What is the function of the EN pin?

The EN pin is an active-low logic input. When high, all switches are turned off. When low, the address inputs (A0, A1, A2) determine which specific switch is activated.

How does the device handle back-powering?

The device lacks an internal diode path to the VDD pin, eliminating the risk of damaging components connected to the supply pin or providing unintended power to the supply rail.