RRB JE CBT2 : EXPERT
23 Jun

DIAC vs TRIAC Comparison Table

ParameterDIACTRIAC
Full FormDiode for Alternating CurrentTriode for Alternating Current
Type of DeviceBidirectional Trigger DeviceBidirectional Thyristor/Switch
Number of Terminals2 (MT1, MT2)3 (MT1, MT2, Gate)
Layers3 or 5 Layers5 Layers
JunctionsUsually 3 Junctions4 Junctions
Control TerminalNo GateHas Gate Terminal
Triggering MethodBreakover VoltageGate Current or Breakover Voltage
Conducts CurrentBoth DirectionsBoth Directions
Switching CapabilityCannot control power directlyCan control AC power
Power HandlingLowHigh
Current RatingSmallLarge
Voltage RatingLow to MediumMedium to High
Main FunctionTriggering DevicePower Control Device
Latching ActionNo significant latchingExhibits Latching & Holding Current
Turn ONAt Breakover VoltageBy Gate Pulse
Turn OFFWhen Current Falls Below Holding CurrentWhen Current Falls Below Holding Current
Gate TerminalNot AvailableAvailable
Trigger SensitivityFixed by Breakover VoltageAdjustable through Gate
SymmetryHighly SymmetricalNearly Symmetrical
ApplicationTriggering TRIACAC Power Control
CostLowHigher than DIAC
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