TMUX1248DCKR

Overview

The TMUX1248DCKR is a single-channel, 2:1 single-pole double-throw (SPDT) analog switch manufactured by Texas Instruments in an SC70-6 package. It operates on a supply voltage range of 1.08 V to 5.5 V with rail-to-rail signal path support from GND to VDD. The device features a typical on-resistance of 3 Ω at 5 V and a maximum of 6 Ω across the temperature range. Supply current is extremely low at 7 nA. Logic inputs are compatible with 1.8 V thresholds and include fail-safe tolerance up to 5.5 V.

Feature Summary

• Bidirectional signal path supporting both analog and digital signals
• Fail-safe logic control tolerant up to 5.5 V regardless of supply state
• Break-before-make switching prevents simultaneous source connection

Applications

• I2C and SPI bus multiplexing
• Analog and digital signal routing
• Rack server systems
• Network interface cards (NIC)
• Barcode scanners

Procurement Notes

Verify the DCKR suffix confirms the SC70-6 package and tape-and-reel delivery format. Confirm RoHS compliance status matches project requirements. Ensure ESD handling protocols are followed during assembly due to the small form factor. Validate that the operating temperature range meets environmental specifications.

Selection Notes

Select this component for applications requiring low power consumption and 1.8 V logic compatibility without external level shifters. The break-before-make feature is critical for preventing signal shorting during transitions. Consider the 3 Ω on-resistance for signal integrity requirements at higher supply voltages.

Part Context

This part belongs to the TMUX12xx family of general-purpose switches designed for low-voltage, low-power applications. The TMUX1248 variant specifically offers 3 Ω on-resistance, distinguishing it from other family members with different resistance profiles while maintaining the same pinout and logic interface.

Replacement Considerations

Check datasheets for alternative SPDT switches within the TMUX12xx series or similar TI families. Verify pin compatibility and electrical parameters such as on-resistance and supply voltage ranges before substitution.

FAQ

How does the fail-safe logic benefit system design?

It allows the SEL pin to be driven up to 5.5 V even when the supply voltage is 0 V, eliminating the need for complex power sequencing.

What is the purpose of break-before-make switching?

It ensures that one source pin disconnects before the other connects, preventing both sources from being active simultaneously and avoiding signal shorting.

Can the TMUX1248 handle signals above its supply voltage?

No, the signal path is limited to the range between GND and VDD, although the logic input can tolerate up to 5.5 V.