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SCR BJT AND MOSFET

SCR BJT MOSFET
Minority carrier device Minority carrier device Majority carrier device
current driven device current driven device voltage driven device
low switching speed medium switching speed high switching speed
low resistive input impedence low input impedence purely capacitive high input impedence
Only single pulse to Turn ON continous DC to maintain Conduction No DC is required to maintain conduction except during turn on and turn off
can be connected in series easily with voltage equalizing circuits series connection is difficult with voltage equalizing circuits series connection is difficult with voltage equalizing circuits
Thermal Run away Thermal Run away No Thermal Run away
line commutation or seperate switching arrangement is required for turn off No separate circuit is Required No separate circuit is Required
can be paralleled with forced current sharing circuits Cannot be easily paralleled because of Vbe matching problem easily paralleled due to positive temperature coefficient of resistance of the device
Most Robust Device Less Robust Device Less Robust Device
Low ON state voltage drop Lower ON state voltage drop High ON state voltage drop
Less Temperature Sensitive Temperature Sensitive Temperature Sensitive
No Second Breakdown Second Breakdown Less Susceptible to Second Breakdown
High Voltage High Current device High Current Low Voltage Device High current medium voltage device

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Do you Know about Triggering An SCR using Light

Light Activated SCR[LASCR]

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