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Pwr Mux Autoswitch 2.8V to 22V 4.5A 12-Pin VQFN-HR T/R

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TPS2121RUXR General Description

The TPS2121RUXR is a power multiplexer IC that enables switching between two different power sources or inputs, providing a seamless transition between them. This functionality is useful in scenarios where redundancy or load sharing between power sources is required to ensure continuous operation and reliability.

Key Features

  • Dual Input Power Multiplexer: The TPS2121RUXR allows you to connect two different power sources (e.g., batteries, power supplies) and seamlessly switch between them based on the input voltage conditions.
  • Low Quiescent Current: The IC is designed to minimize power consumption when operating, making it suitable for battery-powered applications where power efficiency is crucial.
  • Reverse Current Blocking: It includes reverse current blocking to prevent current from flowing back into the inactive input source.
  • Wide Input Voltage Range: The IC typically supports a wide input voltage range, allowing it to work with various power supply voltages.
  • Power-On Reset (POR) Function: The TPS2121RUXR may include a POR function that monitors the input voltage levels and generates a reset signal to ensure proper startup sequencing.
  • Protection Features: Some models of the IC may include protection features such as overvoltage protection (OVP) and thermal shutdown.


  • Battery-Powered Devices
  • Portable Electronics
  • Automotive Electronics
  • Industrial Control
  • Telecommunications
  • Medical Devices
  • Consumer Electronics


Category Integrated Circuits (ICs)Power Management (PMIC)OR Controllers, Ideal Diodes Mfr Texas Instruments
Series - Package Tape & Reel (TR)Cut Tape (CT)Digi-Reel®
Product Status Active Type Source Selector Switch
FET Type N-Channel Ratio - Input:Output 2:1
Current - Output (Max) 4.5A Voltage - Supply 2.8V ~ 22V
Applications General Purpose Operating Temperature -40°C ~ 125°C (TJ)
Mounting Type Surface Mount Package / Case 12-VFQFN
Supplier Device Package 12-VQFN-HR (2x2.5)

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Ratings and Reviews

W**m May 19, 2023

No protection Have not tested whether it can be used or not

M**l Apr 28, 2023

I am very satisfied. Circuits work fine.

v**n Jun 04, 2021

Excellent product and seller. Gave the 3rd set for a full range.

E**n Jan 05, 2021

Soldered back to the place of burned utc2030 on the amplifier nakatomi GS-35. Everything works as it should. It came in a normal package with a "puffy", but everything works and even the legs are not bent.



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Availability: 4447 pieces

Qty. Unit Price(USD) Ext. Price
1+ $1.006 $1.01
10+ $0.853 $8.53
30+ $0.769 $23.07
100+ $0.674 $67.40
500+ $0.619 $309.50
1000+ $0.599 $599.00

The prices below are for reference only.