A solid state relay (SSR) is an electronic switching device that switches on or off when an external voltage (AC or DC) is applied across its control terminals. It serves the same function as an electromechanical relay, but has no moving parts and therefore results in a longer operating lifetime. SSRs consist of a sensor which responds to an appropriate input (control signal), a solid-state electronic switching device which switches power to the load circuitry, and a coupling mechanism to enable the control signal to activate this switch without mechanical parts. The relay may be designed to switch either AC or DC loads.

Packaged solid-state relays use power semiconductor devices such as thyristors and transistors to switch currents up to around a hundred amperes. Solid-state relays have fast switching speeds compared with electromechanical relay and have no physical contacts to wear out. Users of solid-state relays must take into consideration an SSR's inability to withstand a large momentary overload the way an electromechanical relay can, as well as their higher "on" resistance.



Attribute Value
Minimum Load Current 0.55 A
Maximum Load Current 550 mA
Mounting Type PCB Mount
Maximum Load Voltage 60 V
Minimum Control Voltage 1.14 V
Maximum Control Voltage 1.5 V
Contact Configuration SPNO
Terminal Type Through Hole
Output Device PhotoMOS
Package Style DIP4
Maximum Turn On Time 4 ms
Dimensions 4.78 x 6.4 x 3.2mm
Depth 6.4mm
Length 4.78mm
Maximum Operating Temperature +85°C
Off State Leakage Current 1 μA
Control Voltage Range 1.14 → 1.5 V
Height 3.2mm
Load Voltage Range 60V
Minimum Operating Temperature -40°C
Operating Temperature Range -40 → +85°C