Solid-state relays are radiation-hardened for high reliability systems
4 May 2005
Switches, Relays & Keypads
International Rectifier has introduced four devices in a new line of radiation-hardened solid state relays (SSRs) for high reliability applications. These SSRs are hermetically-sealed, all-electronic devices, characterised for total dose levels of up to 100 k rad (Si) or higher. They are 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. Also, because they have no contact bounce, filters can be removed from the system, reducing size and weight," said Rick Furtney, IR vice president, HiRel Sector Business Unit.
The first SSR is the RDHA710SE10A2Q (SMD mount) dual SSR, with current handling capabilities of 20 A (10 A when properly de-rated) and a breakdown voltage capability of 100 V, which is high enough to allow normally applied de-rating. The second and third devices are the RDHA701FP10A8Q and '8C, containing eight SPST, NO, 1,5 A, 100 V 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 fourth SSR is the RDHA720SF06A1N, a single 20 A, 60 V device, also in an SMD package.
"The new SSRs have buffered inputs, so they can be driven directly from logic circuits, simplifying overall design and reducing parts count," Furtney adds.
The SSRs are available in single, dual or octal SPST NO (single pole, single throw, normally open [Form A]) type with current ratings of 1,5 A to 20 A at 60 V to 100 V. In addition, some have internal circuitry to control output transition times for lower dV/dt and dI/dt, minimising system RFI/EMI. Most of these devices are available in alternate style packages for flange mounting.
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