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Contents

Power Electronics

Power Devices

Power Diode Thyristor (SCR)SCR Protection SCR Triggering TRIAC and DIAC Power MOSFET IGBT GTO Wide Bandgap Devices

Rectifiers

Uncontrolled Rectifiers Freewheeling Diode Phase Controlled Rectifiers Semi-Converters Three Phase Rectifiers Dual Converters Source Inductance Effect

AC Voltage Controllers

AC Voltage Controllers Cycloconverters Matrix Converters

Choppers

DC-DC Converter Basics Buck Converter Boost Converter Buck-Boost Converter Cuk Converter Chopper Control Strategies Multiphase Choppers

Inverters

Voltage Source Inverters Three Phase Inverters PWM Techniques Space Vector Modulation Current Source Inverters Multilevel Inverters

Switch Mode Power Supplies

Introduction to SMPS Flyback Converter Forward Converter Push-Pull Converter Half and Full Bridge SMPS Resonant Converters

Motor Drives

DC Motor Drives Braking of DC Motors Induction Motor Drives Vector Control BLDC Motor Drives Stepper Motor Drives

Other Topics

HVDC Transmission FACTS Devices UPS Systems Harmonics in Power Systems

Other Subjects

Analog Electronics Digital Electronics Signals & Systems Control Systems Electromagnetic Theory Digital Communication Analog Communication Network Analysis Microprocessors VLSI Design Verilog HDL Embedded Systems DSP Electronic Devices

Section Progress56%

5 of 9 articles

TRIAC and DIAC

Bidirectional control, dimmer applications.

Updated: 19 March 2026

5 min read

#Power Electronics

TRIAC and DIAC Quiz

Test functional understanding of bidirectional power control devices.

Question 1 of 3

Q1.Structurally, how is a TRIAC equivalent to an arrangement of conventional SCRs?

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GTO and TRIAC

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Thyristor (SCR)

Two-transistor analogy, latching/holding current.

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Thyristors

SCR structure, regenerative feedback.

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GTO

Gate Turn-Off thyristor.

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SCR Protection

Snubber circuits, di/dt, dv/dt protection.

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