COMPARISON BETWEEN SCR, BJT AND MOSFET

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]