MCR218-4 thyristors equivalent, (mcr218-x) silicon controlled rectifiers reverse blocking thyristors.
http://onsemi.com
* Glass-Passivated Junctions
* Blocking Voltage to 400 Volts
* TO-220 Construction − Low Thermal Resistance, High Heat
*
Dissipation an.
such as motor controls, heating controls and power supplies; or wherever half-wave silicon gate-controlled, solid-state.
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