High Current, 1 Form A, Solid State Relay (MOSFET) (60V/2.5A/0.1Ω)

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The ASSR-1611 Solid State Relay (SSR) is specifically designed for high current applications, commonly found in  industrial equipment. The relay is a solid-state replacement for single-pole, normally-open, (1 Form A) electromechanical relays.

The ASSR-1611 consists of an AlGaAs infrared light-emitting diode (LED) input stage optically coupled to a high-voltage output detector circuit. The detector consists of a high-speed photovoltaic diode array and driver circuitry to switch on/off two discrete high voltage MOSFETs. The relay turns on (contact closes) with a minimum input current of 5mA through the input LED. The relay turns off (contact opens) with an input voltage of 0.8V or less.

The ASSR-1611 connection A, as shown in the schematic, allows the relay to switch either ac or dc loads.

The connection B, with its advantages of reduced on-resistance and higher output current, allows the relays to switch dc loads only. The electrical and switching characteristics are specified over the temperature range of -40°C to +85°C.


  • Compact Solid-State Bi-directional Signal Switch
  • Single Channel Normally-off
  • Single-Pole-Single-Throw (SPST) Relay
  • 60V Output Withstand Voltage
  • 2.5A or 5A Current Rating
  • Low Input Current: CMOS Compatibility
  • Low On-Resistance: 20mΩ Typical for DC-only, 65mΩ Typical for AC/DC
  • High Speed Switching: 3.2ms (Ton), 0.1ms (Toff) Typical
  • High Transient Immunity: >1kV/μs
  • High Input-to-Output Insulation Voltage
    • (Safety and Regulatory Approvals)
    • UL recognized - 3750 VRMS and 5000 VRMS* for 1 min per UL1577
    • CSA Component Acceptance


  • Industrial Controls
  • Factory Automation
  • Data Acquisition
  • Measuring Instrument
  • Medical System
  • Security System
  • EMR / Reed Relay Replacement

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory Yes
RoHS6 Compliant Y
On-resistance (ohm) 1.0
Output Off-State Leakage (nA) 100
Output Load Current (A) 2.5
Output Withstand Voltage (V) 60
Package 300mil DIP
Turn Off Time (msec) 0.5
Turn On Time (msec) 5.0
UL Insulation Rating Viso (VRMS) 3750.0
Application Note4 i
Brochures1 i
Options Data Sheet4 i
Selection Guide1 i
FAQs1 i
Promotional Material1 i