Littelfuse has launched an 800 V normally-open single-pole 6-pin solid state relay (SSR) from its Ixys product range for high temperature applications including industrial, medical, and solar
The PLA172P OptoMOS Relay is the first solid state relay from Littelfuse with guaranteed electrical parameters at 105 °C ambient operating temperature. "The PLA172P is an extension to our OptoMOS solid-state relay product line, offering our highest voltage rating (800V) in a surface mount SSR Flatpack package,” said Steve Andrezyk, Global Product Manager at Littelfuse. “It also has our highest temperature range in a solid state relay, extending our operational temperature range from 85 ºC up to 105 ºC, enabling hardware engineers to precisely design their circuits at very challenging temperatures.”
The combination of high voltage rating, high temperature range, and surface-mountable packaging is aimed at instrumentation, medical and isolation test equipment as well as battery isolation monitors and industrial solar field isolation monitors.
The optical SSR replaces electro-mechanical relays (EMRs) that are bulky and prone to failing drop tests and has a unique device pinout that provides more than 6.8 mm of pad-to-pad separation between the high voltage output pins preventing arcing. The isolation is 5kVrms and there is a 5mA input control current over operating temperature range
Isolation current monitor circuits for higher voltage systems over 400 V require high blocking voltage, low off-state leakage current relays with high input-to-output isolation rating to prevent potential lethal current conduction to the system chassis. The PLA172P relay’s 800 V load voltage rating with 100 mA load current capability provides additional design margin compared to the more common 600 V rated SSRs, particularly on noisy AC power line applications and high voltage battery applications.
The PLA172P OptoMOS SSR relays are available in tape and reel format in quantities of 1,000 as well as 50 per tube. Additional information is available on the solid state relays product page and PLA172P 800V Normally-Open Single-Pole 6-Pin OptoMOS datasheet .