Thyristor Semiconductor Products Page 61 Thyristor

2014 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/14/14 Teccor brand Thyristors AN1006 Procedure 2: (+)V DRM and (+)I DRM To measure the (+)V DRM and (+)I DRM parameter: 1. Set Left-Right Terminal Jack Selector to correspond with the location of the test fixture. 2. Increase Variable Collector Supply Voltage to the rated V DRM of the device and observe the dot on the CRT. Read across horizontally from the dot to the vertical current scale. This measured value is the 50 nA 50 V PER V E R T DIV PER H O R I Z DIV PER S T E P ()k DIV 9m PER DIV V DRM I DRM Figure AN1006.22 I DRM = 50 nA at V DRM Procedure 3: (-) V DRM and (-) I DRM To measure the (-)V DRM and (-)I DRM parameter: 1. Set Polarity to (-). 2. Repeat Procedures 1 and 2. (Read measurements from upper right corner of the screen). Procedure 4: V BO and I BO To measure the V BO and I BO parameter: 1. Set Variable Collector Supply Voltage Range to 1500 Max Peak Volts. ( 2000 V on 370) 2. Set Horizontal knob to a sufficient scale to allow viewing of trace at the required voltage level ( 50 V/DIV for 95 V to 215 V V BO range devices and 100 V/DIV for devices having V BO 15 V). 3. Set Vertical knob to 50 A/DIV. 4. Set Polarity to AC. 5. Set Mode to Norm. 6. Set Power Dissipation to 10 W. 7. Set Terminal Selector to Emitter Grounded-Open Base. 8. Set Left-Right Terminal Jack Selector to correspond with location of test fixture. Procedure 5: V BO To measure the V BO parameter, increase Variable Collector Supply Voltage AN1006.23) The voltage at which current begins to flow and voltage on CRT does not increase is the V BO value. 50 A 50 V PER V E R T DIV PER H O R I Z DIV PER S T E P ()k DIV 9m PER DIV V BO +V BO +I BO I BO Figure AN1006.23 (+)V BO = 100 V; (-)V BO = 100 V; ()I BO Procedure 6: I BO To measure the I BO parameter, at the V BO point, measure the amount of device current just before the device reaches the breakover mode. The measured current at this point is the I BO value. Note: If I BO is less than 10 A, the current cannot readily be seen on the curve tracer. Procedure 7: I H(Forward and Reverse) To measure the I H (Forward and Reverse) parameter: 1. Set Variable Collector Supply Voltage Range to 1500 Max Peak Volts ( 400 V on 577; 2000 V on 370). 2. Set Horizontal knob to a sufficient scale to allow viewing of trace at the required voltage level (50 V/DIV for devices with V BO V/DIV for devices having V BO 215 V). 3. Set Vertical knob to 20% of maximum holding current specified. 4. Set Polarity to AC. 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. 8. Set Left-Right Terminal Jack Selector to correspond with the location of the test fixture. WARNING: Limit test time to 15 seconds maximum. 9. Increase Variable Collector Supply Voltage until device breaks over and turns on. (Figure AN1006.24) Thyristor and Rectifier Testing Using Curve Tracers (continued)

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