- It has three terminals : Emitter, base and collector.
- It is a three layer, two junction device.
- The transistor is switched on by continuous base current.
- On state voltage drop is in the order of 0.3 to 0.8 voltages.
- The transistors are available in comparatively low voltage and current ratings.
- Commutation circuit does not necessary.
- Applicable for high frequency
- It has three terminals : Anode, cathode and gate.
- It is a four layer, three junction device.
- The SCR is switched on by gate pulse.
- The SCR remains in on condition after removing gate pulse.
- On state voltage drop is in the range of 1.0 to 1.5 voltages.
- SCRs are available in high voltage and high current ratings.
- Commutation circuit requires for the DC applications.
- Applicable for low frequency
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