Littelfuse PLA172P 800V solid state relay launched

13th July 2020
Alex Lynn

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

The PLA172P is an extension to Littelfuse's OptoMOS solid-state relay product line, offering its highest voltage rating (800V) in a surface mount SSR Flatpack package. Steve Andrezyk, Global Product Manager at Littelfuse said: “It also has our highest temperature range in a solid-state relay, extending our operational temperature range from 85oC up to 105oC, enabling hardware engineers to precisely design their circuits at very challenging temperatures.”

This combination of high voltage rating, high temperature range, and surface-mountable packaging is recommended for applications including:

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

The PLA172P OptoMOS relay includes these key benefits:

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

Isolation current monitor circuits for higher voltage systems >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 800V load voltage rating with 100mA load current capability provides additional design margin compared to the more common 600V rated SSRs, particularly on noisy AC power line applications and high voltage battery applications. The 105oC specifications including the low 5 µA maximum off-state leakage current rating in conjunction with the low on-resistance, making it a good choice for high precision isolation current monitor applications.

PLA172P OptoMOS relays are available in tape and reel format in quantities of 1,000 as well as 50 per tube.

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