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Littelfuse add 105ºC rated, 800V solid state relay to portfolio

Littelfuse has launched the PLA172P OptoMOS Relay, an 800 V normally-open single-pole 6-pin solid-state relay (SSR), the first in the company's portfolio that comes with guaranteed electrical parameters at 105 °C ambient operating temperature.

The PLA172P is an extension to the company's OptoMOS solid-state relay product line, offering its highest voltage rating (800V) in a surface mount SSR Flatpack package, extending the line's operational temperature range from 85 ºC up to 105 ºC, enabling hardware engineers to design for extremely high temperatures. Applications include:

  • Industrial
  • Instrumentation
  • Medical
  • Isolation Test Equipment
  • Battery Isolation Monitors
  • Industrial Solar Field Isolation Monitor

The PLA172P OptoMOS relay provides a number of key benefits, according to Littelfuse, including:

  • Replaces electro-mechanical relays (EMRs) that are bulky and prone to failing drop tests
  • Unique device pinout provides more than 6.8 mm of pad-to-pad separation between the high voltage output pins preventing arcing
  • 5000 VRMS input-to-output isolation
  • 5 mA low input control current over operating temperature range

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 105 C specifications including the low 5 µA maximum off-state leakage current rating in conjunction with the low on-resistance, making it a suitable choice for high precision isolation current monitor applications.

Neil Tyler

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