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Solid-state relay integrates current-limiting circuitry

Posted: 23 May 2005 ?? ?Print Version ?Bookmark and Share

Keywords:solid-state relay? wireline-interface? current-limit? mosfet? relay switch?

Designed to replace electromechanical devices, a new current limiting, normally open, 1 Form A optically isolated solid-state relay (SSR) from Clare Inc., an IXYS company, saves board space while enhancing the performance of wireline-interface applications.

Manufactured in Clare's dielectrically isolated silicon technology, the single-pole OptoMOS CPC1510 SSR features active current-limit protection circuitry integrated with the output MOSFET relay switches. The active current limit circuitry also provides a thermal shutdown feature, offering excellent power cross immunity for improved survivability in harsh environments to improve the robustness of end systems, said the company.

The new relay provides current limiting for both unidirectional dc and bi-directional ac applications. Output load voltage specification for the device is 250V and the continuous load current handling capability is 200 mA maximum. Maximum on-resistance is 15 ohms for bi-directional and 3.75 ohms for unidirectional applications. A highly efficient GaAIAs LED is used for actuation control. Other key features include linear ac/dc operation, low power consumption, bounce-free switching, and low power drive requirements.

"With high circuit integration and built-in current-limit protection, the CPC1510 simplifies PC-board layout design and reduces error rates and manufacturing complexities. In addition, this device saves 20% board space, making it an excellent choice for applications requiring current limiting," said Steve Andrezyk, Clare director of marketing, in a statement.

Applications include general telecom switching applications such as the hook switch or ringing relay, instrumentation, industrial controls, peripherals, security, and medical equipment.

Pricing for the new relay is $1.48 in quantities of 10,000. Available in production volumes, delivery is six weeks.

- Gina Roos


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