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Vishay offers thermal models for optocouplers, SSRs

Posted: 13 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:optocouplers? solid-state relays? SSR? Vishay? Flotherm?

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Vishay Intertechnology Inc. is now providing detailed thermal characteristics for its newly released optocouplers and solid-state relays (SSRs) that have a total power dissipation of 200mW and higher. Vishay said it's the first optocoupler and SSR manufacturer to provide these thermal models to help reduce design time.

The first Vishay optocoupler products available with the detailed thermal characteristics are the 60V VO1400AEFT2 SSR, the 0.5A VO3150 IGBT driver, the 1.5kV/?s VO3063 and VO3062 and 5kV/?s VO4154, VO4156, VO4157, and VO4158 zero-crossing phototriacs; and the 5kV/?s VO4254, VO4256, VO4257, and VO4258 non-zero-crossing phototriacs.

This new thermal data will allow designers to more accurately simulate heat distribution and thermal impedance for optocoupler and SSR devices, said the company. Vishay offers a compact thermal model as well as a Flotherm model for those customers who use this software from Flomerics.

Common thermal characteristics of junction-to-ambient or junction-to-case thermal impedance are available, as well as all the other components in the thermal network. Designers can use these values to calculate temperatures for a given operating condition. The thermal behavior for a given application will depend on the type of PCB, the specifics of the layout and the thickness of the copper traces.

The Flotherm analysis software tool used to model Vishay's optocoupler and SSR devices uses computational fluid dynamics techniques to predict the in situ airflow and temperature environment of components and PCBs in industrial equipment, computers, telecommunication systems and other end products. This enables the designer to quickly identify the source of any overheating, and to devise and test appropriate design modifications.

All devices in these families are available in production quantities with lead times of six to eight weeks.

- Gina Roos

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