Thyristor Semiconductor Products Page 62 Thyristor

2014 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/14/14 Teccor brand Thyristors AN1006 20 mA 50 V E R T H O R I Z S T E P I H I H Figure AN1006.24 I H = 48 mA in both forward and reverse directions I H is the vertical distance between the center horizontal axis and the beginning of the line located on center vertical axis. Procedure 8: V TM(Forward and Reverse) To measure the V TM (Forward and Reverse) parameter: 1. Set Variable Collector Supply Voltage Range to 350 Max Peak Volts. ( 400 V on 370) 2. Set Horizontal knob to 0.5 V/DIV. 3. Set Vertical knob to 0.5 A/DIV. 4. Set Polarity to (+). 5. Set Mode to Norm . 6. Set Power Dissipation to 220 W ( 100 W on 577). 7. Set Terminal Selector to Emitter Grounded-Open Base. Before continuing with testing, note the following: Kelvin fixture is not used, an error in measurement of V TM will result due to voltage drop in fixture. If a Kelvin fixture is not available, Figure AN1006.3 shows necessary information to wire a test fixture with Kelvin Connections. To continue testing, perform the following procedures. Procedure 9:V TM(Forward) To measure the V TM (Forward) parameter: 1. Set Left-Right Terminal Jack Selector to correspond with the location of the test fixture. 2. Increase Variable Collector Supply Voltage until current reaches rated I T(peak) , which is 1.4 times the I T(RMS) rating of the SIDAC. Note: Model 370 current is limited. Set to 400 mA. Check for 1.1 V MAX. WARNING: Limit test time to 15 seconds. 3. To measure V TM , follow along horizontal scale to the point where the trace crosses the I T(peak) value. This horizontal distance is the V TM 500 mA 500 mV PER V E R T DIV PER H O R I Z DIV PER S T E P ()k DIV 9m PER DIV V TM I PK Figure AN1006.25 V TM (Forward) PK = 1.4 A Procedure10: V TM(Reverse) To measure the V TM (Reverse) parameter: Set Polarity to (-). Repeat Procedure 8 to measure V TM(Reverse) . DIACs DIACs are voltage breakdown switches used to trigger-on Triacs and non-sensitive SCRs in phase control circuits. Note: DIACs are bi-directional devices and can be connected in either direction. To connect the DIAC: Connect one side of the DIAC to the Collector Terminal (C). Connect other side of the DIAC to the Emitter Terminal (E). To begin testing, perform the following procedures. Procedure 1: Curve Tracer Setup To set the curve tracer and begin testing: 1 Set Variable Collector Supply Voltage Range to 75 Max Peak Volts . ( 80 V on 370) 2. Set Horizontal knob to sufficient scale to allow viewing of trace at the required voltage level ( 10 V to 20 V/DIV depending on device being tested). 3. Set Vertical knob to 50 A/DIV. 4. Set Polarity to AC. 5. Set Mode to Norm. 6. Set Power Dissipation to 0.5 W. ( 0.4 W on 370) 7. Set Terminal Selector to Emitter Grounded-Open Base. Thyristor and Rectifier Testing Using Curve Tracers (continued)

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