General Purpose, 2 Form A, Solid State Relay (Photo MOSFET), 400V/0.12A/25ohm

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The ASSR-41XX Solid State Relay (SSR) series uses 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 3mA through the input LED. The relay turns off (contact opens) with an input voltage of 0.8V or less.

The single channel configurations, ASSR-4110 and ASSR-4111, are equivalent to 1 Form A Electromechanical Relays (EMR), and the dual channel configuration, ASSR-4120, is equivalent to 2 Form A EMR. They are available in 4-pin SO, 6-pin DIP, 8-pin DIP and Gull Wing Surface Mount for DIP packages. Their electrical and switching characteristics are specified over the temperature range of -40°C to 85°C. They are used for general purpose switching of signals and low power AC/DC loads.

ASSR-4111 enables AC/DC and DC-only output connections. For DC-only connection, the output current, Io, increases to 0.24A and the on-resistance, R(ON) reduces 8.5Ω.


  • Compact Solid-State Bi-directional Signal Switch
  • Single and Dual Channel Normally-off Single-Pole-Single-Throw (SPST) Relay
  • 400V Output Withstand Voltage
  • 0.12A or 0.24A Current Rating (See Schematic for ASSR-4111 Connections A & B)
  • Low Input Current: CMOS Compatibility
  • Low On-Resistance: 5.5Ω Typical for DC-only, 16Ω Typical for AC/DC
  • Very High Output Off-state Impedance: 10 Teraohms Typical
  • High Speed Switching: 0.1ms (Ton), 0.02ms (Toff) Typical
  • High Transient Immunity: >1kV/μs
  • High Input-to-Output Insulation Voltage
    (Safety and Regulatory Approvals)
    - 3750 Vrms for 1 min per UL1577
    - CSA Component Acceptance
  • Options available are:
    503E = Tape and Reel Packaging Option
    XX3E = Lead-Free Option

    302E = Gull Wing Option
    502E = Tape and Reel Packaging Option
    XX2E = Lead-Free Option

    302E = Gull Wing Option
    502E = Tape and Reel Packaging Option
    XX2E = Lead-Free Option


  • Telecommunication Switching
  • Data Communications
  • Industrial Controls
  • Medical
  • Security
  • EMR / Reed Relay Replacement

Lifecycle Status


Substance Compliance

  • RoHS6
    Fully Compliant
Specification Value
Lifecycle Active
Distrib. Inventory Yes
RoHS6 Compliant Y
On-resistance (ohm) 25.0
Output Off-State Leakage (nA) 100
Output Load Current (A) 0.12
Output Withstand Voltage (V) 400
Package 300mil DIP
Turn Off Time (msec) 0.2
Turn On Time (msec) 0.5
UL Insulation Rating Viso (VRMS) 3750.0
Application Note5 i
Brochures1 i
Options Data Sheet6 i
Photocard1 i
Product Change Notice (PCN)3 i
Regulatory Certificate1 i
Reliability Data Sheet1 i
Selection Guide1 i
White Papers2 i
FAQs1 i
Promotional Material1 i