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Optocouplers

Optocouplers
Optocouplers use LEDs and phototransistors to close circuits. This ensures optical isolation of integrated circuit components, making optocouplers good choices for reducing noise. Single, dual, and linear optocouplers made by Littelfuse can be paired with shunt resistors to adjust the current required to activate the devices. We also offer solid state relay–optocoupler modules that include bridge rectifiers, Darlington transistors, and Zenner diodes. Find your solution in our Integrated Circuits Selection Guide.
  • Input-to-out isolation of 3750 Vrms
  • Available with typical current transfer ratios of 300 % to 8500 %
  • Typical input-to-output capacitance of 3 pF
  • CSA, EN/IEC, and TUV certified
  • UL Recognized
  • Available with 6 to 16 pins
  • Configured as surface mount or thru hole devices
  • Optical and on-chip galvanic isolation
  • Solid state relay–optocoupler modules allow designers to simplify circuits and reduce component counts
  • Ideal for telecommunications, industrial control, and instrumentation circuits where isolating circuitry is crucial

Optocouplers Parts

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Optocouplers 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,

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Pumps, Heaters & Small Motors

As a simplified block diagram shows, a complex system of pumps, motors, and heaters allows coffee makers and espresso machines to grind beans,

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