Opto Mosfet (SSR) equivalent circuit

OBones · 2005-04-01T19:11:20+00:00

Hi allI'm having a hard time finding Opto mosfets in electronics shops and the manufacturer (or their distributor) doesn't want to sell them in small quantities (10 or less). The model I'm interested in is the LH1512B from Vishay which datasheet is here:As a result, I'm considering building a replacement circuit with a regular optocoupler and mosfets.The application is to use two of these Form C SSR to swith telephone lines. As I require one line to be connected without power, I need the Normally Closed behaviour of the Mosfet.In the end, I just need two LH1512B so that I can have the functionnality of a DPDT relay.Can anyone help with the design of such an equivalent circuit ?Thanks a lot in advance.CheersOlivier

Apr 01, 2005 23 Replies

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Fred Bartoli 21 years ago

I have to pass an order at digikey too. We could share costs. Write me in private.

Thanks, Fred.

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Tony Williams 21 years ago

A relay is better at the side issues of overvoltage and overcurrent. For reduced power use a bistable maglatch relay, which only needs to be pulsed to switch over. For best low level signal handling choose a sealed relay with au-au contacts. eg, Omron G6AK-234 series.

Tony Williams.

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