Thyristors are discrete semiconductor switching devices built on a multilayer PN structure that enables controlled conduction between terminals. Once triggered into the on-state, a thyristor typically remains conductive until the current falls below a holding condition or the device is actively commutated, depending on the thyristor type.

Within the discrete semiconductors category, thyristors are commonly grouped as a family of latching power-control components, including variants that differ in triggering method and controllability.

• Latching switching behavior with a defined trigger mechanism to initiate conduction
• Bidirectional or unidirectional conduction depending on device structure and variant
• Power switching role as a controllable rectifying element in electronic circuits