Latch-up and how are these parts immune to it?

Document created by analog-archivist Employee on Feb 23, 2016
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What is Latch-up and how are these parts immune to it?

 

Latch-up is an undesirable, high current, state that can significantly reduce
the lifetime of a part or cause permanent damage and failure. 
Junction-isolated CMOS switches exhibit a silicon-controlled rectifier (SCR)
circuit when the parasitic junction diodes become forward biased. With trench
isolation technology, each N-well and P-well is physically separated by an
insulating oxide layer and the parasitic diode is removed. This results in a
switch that is immune to latch-up under all conditions.

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