Panasonic PhotoMOS® Optically Isolated Solid State Relays


Balance is paramount in today’s industrial automation control devices. Low-voltage control circuits must interact reliably with high-voltage drive or power circuits, with as little noise as possible. Relays are one way to accomplish this, and optically isolated relays provide an ideal balance of features and performance. This article explores new ultra-durable, low-power PhotoMOS® optically-isolated solid-state relays from Panasonic.

Panasonic’s patented PhotoMOS Relays are optically isolated MOSFET Relays. The input circuit has an LED that transmits light when activated to a series of photocells that, in turn, charges a pair of MOSFETs on the output circuit.

  • Long Life
  • Low Power Consumption
  • No Contact Wear
  • Fast Switching Life
  • No Arc
  • No Bounce
  • Small Size
  • No Noise


PhotoMOS® Solid State Relays

Panasonic has introduced a new technology that uses a voltage-driven method, with capacitive-coupled isolation (no LEDs in the input circuit) as opposed to current-driven, Optically Isolated Relays. The PhotoMOS CC Type Relays offer distinct benefits for certain markets including Test & Measurement, Safety & Security and Industrial. These advantages include:

  • Low Current Consumption (input current Max 0.2mA)
  • High-Temperature Performance Guaranteed (Max 105°C or 221°F)
  • Voltage Driven (3V to 5V)
  • Low Output Capacitance and Low On Resistance
  • Energy Savings and Increased Drivability (No LEDs on input side)


PhotoMOS® Applications

Test and Measurement

  • Automatic Test Equipment (SoC/Memory/Analog, etc.)
  • Data Logger
  • Board Tester
  • Cable Tester


Industrial / Factory Automation

  • Programmable Logic Controller (PLC)
  • Robotics
  • Distributed Control System (DCS)


Storage Battery Unit

  • Industrial UPS
  • Home Storage System
  • Data Center UPS


HVAC System

  • Thermostat
  • Signal Control


Learn more

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