TMUX121NKGR

Overview

The TMUX121NKGR is a bidirectional, low-capacitance analog switch featuring two independent 2:1 single-pole double-throw (SPDT) channels. Designed for high-speed signal routing, it supports both differential and single-ended signals within a 0 V to 3.6 V range. The device operates on a 3.3 V supply voltage with an industrial temperature range of -40°C to +125°C. Key electrical parameters include a typical on-resistance of 3 Ω, on-capacitance of 1.7 pF, and a bandwidth of 3 GHz. It incorporates power-off isolation to maintain high impedance when VDD is absent, ensuring safe operation in powered-down states.

Feature Summary

• Supports high-speed I3C and I2C communication protocols with minimal signal attenuation
• Features IPOFF protection that forces all I/O pins into a high-impedance state during power loss
• Compatible with 1.8 V and 3.3 V logic control inputs for direct GPIO interfacing

Applications

• I3C and I2C peripheral switching
• Servers and notebook PCs
• Smartphones and portable monitors
• Electronic point-of-sale systems

Procurement Notes

Verify the specific ordering suffix 'NKG' corresponds to the UQFN-10 package configuration required for your PCB layout. Confirm that the tape and reel quantity matches your assembly line requirements. Ensure the component meets RoHS compliance standards for your target market regulations before finalizing procurement orders.

Selection Notes

Select this component when space constraints require a compact 1.4 mm x 1.8 mm footprint. Choose the TMUX121 for applications demanding low insertion loss and high off-isolation for sensitive analog or digital lines. Ensure the system operates within the specified 3.3 V supply voltage limits and requires bidirectional signal switching capabilities.

Part Context

This part belongs to the Texas Instruments TMUX121 series of low-capacitance multiplexer switches. It is specifically engineered for high-frequency signal integrity preservation in compact electronic designs. The NKG suffix identifies the specific plastic quad flatpack no-lead package variant used in surface-mount applications.

Replacement Considerations

Consult the official datasheet addendum for verified alternative part numbers within the same family. Ensure any substitute maintains identical pin configurations and electrical characteristics to guarantee compatibility without redesigning the host circuit board.

FAQ

How does the TMUX121 handle power-off conditions?

The device features IPOFF protection which forces all input/output pins into a high-impedance mode when the VDD supply voltage is not present, preventing current leakage.

What is the maximum operating voltage for the signal lines?

The source and drain voltages can range from 0 V to 3.6 V, allowing the switch to handle signals up to this limit regardless of the control logic voltage.

Is the switch bidirectional?

Yes, the TMUX121 is a bidirectional analog passive switch suitable for routing both differential and single-ended signals in either direction.