Diac and Triac Diodes

What Family is the Diac a part of

The Diac is part of the Thyristor Family

What direction can the Diac Operate in?

The Diac can operate in both directions

A Diac is similar to two diode in

• Series

• Parallel

A Diac is similar to two diode in Parallel

What are the leads of a Diac labeled as

MT1 and MT2

The Diac is also known as a ______ _____ Switch

Voltage sensitive Switch

What must be reached before a Diac will turn on

• Current

• Resistance

• Voltage

Voltage must be reached for a Diac to turn on

A Diac is most often used to control a

• Diode

• SCR

• Triac

• Zener

A Diac is most often used to control a Traic

Draw and label a Diac

What does MT1 and MT2 mean when referring to the leads of a Diac

Main Terminal 1 & 2

When testing a Diac with a DMM, what will it show?

It will show Open or O/L in both directions

What is the voltage drop of a Diac

• 2-5 volts

Is a diac a triggering device

• Yes, the Diac is a triggering device

What is the main purpose of a Diac

• To phase shift a Triac

Diac is know as a ______&______ device (

• Special Purpose device

• Bi Directional Device

Can a Diac work with an AC circuit

• Yes

What happens when a Diac falls below its constructed level?

• It turns off

Diac can preform on _____ half of the alternating current

• either

What family is a Triac in?

• Thyristor

What direction can the Diac Operate in?

What are the leads of a Diac labeled as

Draw and label a Diac

How many leads are on a Triac?

A Triac is similar to 2 ___ Connected

• SCRs

What does a Diac Trigger

The gate of another AC Device ( Triac)

What type of materials is a Triac made of?

PNPN type materials

What 3 devices can be used together in the gate circuit to Trigger an SCR or Triac after an AC signal has peaked

• Diac

• Capacitor

• Resister

What is it about the Thyristor family that makes them different from other devices

• All Binary devices

When a SCR is turned on voltage does it typically drop across it

• about 1 volt