THAT4301 Reaches End of Life

THAT corporation has released an end of life notification for the THAT4301. This includes all variations and package styles. The deadline for last time buy orders submitted to Profusion will be 26th April, but delivery can be scheduled out until 1st May 2020.


The closest replacement to the 4301 is the THAT4305. Details can be found on the Profusion website here. The 4305 runs from similar power supply voltages and provides the critical VCA and RMS level detector functions of the 4301.

View 4301 to 4305 Transition Guide

To replace the opamps, we also have a number of other suitable options:

Samples of all these are available on request. If you have any further questions, please contact the Profusion sales team and we’ll be happy to help.

THAT4301 diagram
THAT4301 schematic
4301 Pig Back schematic: click for enlarged PDF