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Products > Opto-Electronics Devices > OCMOS FET > Technical Description >

The operatable models of Optical-coupled MOS FET (SSR)


April 2004

There are two types of Optical-coupled MOS FETs(OCMOS FET: Solid State Relay: SSR): "make" type ("a" contact: Normally open) and "break" type ("b" contact: Normally closed).
You can experience the difference between these two types by operation of the simulating models below.

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1. "Make" type ("a" contact: Normally open)


This type contains a couple of enhancement-type MOS FETs.
They shuts off by application of no bias, and conducts by application of forward bias.
The initial state is "OFF".


Make type (a contact: Normally open)


2. "Break" type ("b" contact:Normally closed)


This type contains a couple of depletion-type MOS FETs.
They conducts by application of no bias, and shuts off by application of reverse bias.
The initial state is "GO".


Break type (b contact: Normally closed)