Standard, 2 Form A, Solid State Relay (Photo MOSFET), 400V/0.1A/35Ω

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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-4118 and ASSR-4119, are equivalent to 1 Form A Electromechanical Relays (EMR), and the dual channel configuration, ASSR-4128, 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. ASSR-4119 enables AC/DC and DC-only output connections. For DC-only connection, the output current, Io, increases to 0.2A and the on-resistance, R(ON) reduces to 10Ω.


  • Compact Solid-State Bi-directional Signal Switch
  • Single and Dual Channel Normally-off Single-Pole-Single-Throw (SPST) Relay
  • 400V Output Withstand Voltage
  • 0.1A or 0.2A Current Rating (see schematic for ASSR-4119 connection A and B)
  • Low Input Current: CMOS Compatibility
  • Low On-Resistance: 8 Ω Typical for DC only, 25 Ω Typical for AC/DC
  • High Input-to-Output Insulation Voltage
    (Safety and Regulatory Approvals Pending)
    - 3750 Vrms for 1 min per UL1577
    - CSA Component Acceptance
  • Options available are:
    50XE = Tape and Reel Packaging Option
    XXXE = RoHS Compliant Option

ASSR-4119 & ASSR-4128
30XE = Gull Wing Option
50XE = Tape and Reel Packaging Option
XXXE = RoHS Compliant 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) 35.0
Output Off-State Leakage (nA) 1000
Output Load Current (A) 0.1
Output Withstand Voltage (V) 400
Package SO4
Turn Off Time (msec) 1.0
Turn On Time (msec) 3.0
UL Insulation Rating Viso (VRMS) 3750.0
Application Brief1 i
Application Note5 i
Brochures1 i
Data Sheet1 i
Options Data Sheet6 i
Product Change Notice (PCN)1 i
Regulatory Certificate1 i
Reliability Data Sheet1 i
Selection Guide2 i
White Papers3 i
FAQs1 i
Promotional Material1 i