other thyristors
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Other Thyristors
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Other Thyristors
Silicon Unilateral Switch
Silicon Bilateral Switch
Gate Turnoff Thyristor
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SILICON UNILATERAL SWITCH
Four-layer device similar to SCR
Unilateral means it operates in one direction
Similar operation with SCR
SUS turns on for a fixed anode gate voltage
SUS breakdown Voltage is about 6-10 V while
SCR is 50V and above
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SILICON UNILATERAL SWITCH
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SILICON UNILATERAL SWITCH
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SILICON BILATERAL SWITCH
It is useful in triggering TRIACs
Similar to DIAC
Conducts current in both ways
Has negative resistance
Advantage over DIAC because of lower
breakover voltage More pronounce negative resistance region than
DIAC
Operates similar to a TRIAC
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SILICON BILATERAL SWITCH
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SILICON BILATERAL SWITCH
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GATE TURNOFF THYRISTOR
Turn on is similar to that of an SCR
Unlike SCR, GTO can be turned off through thegate terminal
fast turnoff time and high current turn offcapability
GTO is turned on only with a positive gatevoltage. It is then turned of with a negative gatevoltage
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GATE TURNOFF THYRISTOR
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Device Specifications ApplicationsSilicon Bilateral Switch
DC forward anode Current= 175mADC gate Current= 5mASwitching Voltage= 7-9VSwitching Current= 200A
Trigger Circuit for TRIAC, oscillators and timers BS08D-112
NTE6403
DC forward anode Current= 175mA
DC gate Current= 5mASwitching Voltage= 7.5-9VSwitching Current= 120A
For Triggering SCR and TRIAC phase controlcircuits
Silicon Unilateral SwitchDC forward anode Current= 175mADC gate Current= 5mASwitching Voltage= 6-10VSwitching Current= 500A
SCR triggers, frequency Dividers, ring counters,
cross point switching, Over-Voltage Sensor2N4897
2N4986
DC forward anode Current= 175mADC gate Current= 5mASwitching Voltage= 7-9VSwitching Current= 200A
SCR triggers, frequency Dividers, ring counters,
cross point switching, Over-Voltage Sensor
2N4989
DC forward anode Current= 175mADC gate Current= 5mASwitching Voltage= 7.5-8.2VSwitching Current= 300A
SCR triggers, frequency Dividers, ring counters,
cross point switching, Over-Voltage Sensor
EXISTING DEVICES
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Device Specifications ApplicationsGate Turnoff Thyristor
On-state Voltage=3.5VPeak off-state Current=50mAPeak reverse Current=50mAGate Trigger Voltage=1.0VGate Trigger Current=1.5A
VSD-AC, UPS, High Voltage
Converters, Choppers, Welding,
Induction HeatingDG408BP54
5SGF30J4502On-state Voltage=3.9VPeak off-state Current=100mAPeak reverse Current=50mAGate Trigger Voltage=1.2VGate Trigger Current=2.5A
VSD-AC, UPS, High Voltage
Converters, Choppers, Welding,
Induction Heating
DGT305SE
On-state Voltage=2.5VPeak off-state Current=50mAPeak reverse Current=50mAGate Trigger Voltage=0.5VGate Trigger Current=1.2A
VSD-AC, UPS, High Voltage
Converters, Choppers, Welding,
Induction Heating
EXISTING DEVICES