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IR SSRs target Hi-Rel apps

Posted: 06 Apr 2005 ?? ?Print Version ?Bookmark and Share


International Rectifier (IR) rolled out a quartet of devices in a new line of RAD-Hard solid state relays (SSRs) for high reliability (Hi-Rel) applications. According to IR, these new hermetically sealed SSRs are radiation-hardened all-electronic devices designed to improve reliability by replacing electro-mechanical relays in power bus switching, heater control circuits, battery charging and other hi-rel applications.

"Solid-state relays have switching times that are similar to electro-mechanical relay switching times, but are immune to vibration and shock, increasing reliability. Since they have no contact bounce, filters can be removed from the system, reducing size and weight,quot; said Rick Furtney, VP of IR's Hi-Rel Sector Business Unit. "Also, these new SSRs have buffered inputs, so they can be driven directly from logic circuits, simplifying overall design and reducing parts count."

The first SSR is the RDHA710SE10A2Q (SMD mount) dual SSR, with current handling capabilities of 20A (10A when properly de-rated) and a breakdown voltage capability of 100V, which is high enough to allow normally applied de-rating. The second and third devices are the RDHA701FP10A8Q and the RDHA701FP10A8C, containing eight SPST, NO, 1.5A, 100V SSRs with selectable input actuation methods and a choice of rise/fall time control. They are housed in a 64-pin surface mount package. The RDHA720SF06A1N, the fourth SSR, is a single 20A, 60V device, also in an SMD package.

The new products are characterized for total dose levels of up to 100k rad (Si) or higher, and single event effects (SEE) immunity up to an linear energy transfer (LET) of 37MeV/( or higher. Isolation is 1,000V I/O. Furthermore, some of the new relays have internal circuitry to control output transition times for lower dV/dt and dI/dt, minimizing system RFI/EMI.

The new SSRs are available in single, dual or octal SPST NO (single pole, single throw, normally open [Form A]) type with current ratings of 1.5A to 20A at 60V to 100V. Most of these products are available in alternate style packages for flange mounting.

Pricing begins at $1,122 each for the RDHA710SE10A2Q (unscreened) in 100-piece quantities. Prices are subject to change.

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