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Series: 1-Form-A

Bidirectional normally open output
Product Status| Activei
littelfuse-semiconductor-relays-1-form-a
littelfuse-semiconductor-relays-1-form-a-01-block-diagram
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The OptoMOS® line of solid-state relays uses discrete semiconductor components and the patented OptoMOS® architecture to deliver fast, reliable, bounce-free switching in a compact design. From one of the world's smallest single-pole, 4-pin relays to multi-pole and multi-function devices, OptoMOS® products are an ideal solid-state replacement for larger reed and electromechanical relays. Compared to these old electromagnetic technologies, our OptoMOS® relays offer significantly lower drive current, small package size, no susceptibility to magnetic interaction, and solid-state reliability. All of these are key requirements for the design of today's complex, low-power, multi-channel products.


  • Low drive current
  • High reliability
  • Provides galvanic input to output isolation
  • Low drive current
  • High reliability
  • Provides galvanic input to output isolation

1-Form-A Parts

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1-Form-A Applications

three electricity meters with green digital screens
Electricity Meters

Smart electricity meters give building managers insight into and control over energy use. Littelfuse makes the solid state relays,

PIR motion detector
PIR Motion Detectors

Passive infrared (PIR) sensors work with security systems, lighting controls, and automated doors and gates to make buildings safer. A block

Gas water meter
Gas & Water Meters

Smart gas and water meters promise to give building managers important tools to lower utility bills and increase safety. The flow meters can only

Highlights Section

  • Replace electromechanical relays
  • Replace mechanical switches
  • Implement computer control of electromechanical circuits