latch-up phenomenon

latch-up phenomenon

[′lach ‚əp fə‚näm·ə‚nän]
(electronics)
In a bipolar or MOS integrated circuit, the generation of photocurrents by ionizing radiation which can provide a trigger signal for a parasitic pnpn circuit and possibly result in permanent damage or operational failure if the circuit remains in this state.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.