Thyristor Semiconductor Products Page 54 Thyristor

2014 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/14/14 Teccor brand Thyristors AN1006 Triacs Triacs are full-wave bidirectional AC switches turned on when current is supplied to the gate terminal of the device. If gate control in all four quadrants is required, then a sensitive gate Triac is needed, whereas a standard Triac can be used if gate control is only required in Quadrants I through III. To connect the Triac: 1. Connect the Gate to the Base Terminal (B). 2. Connect MT1 to the Emitter Terminal 3. Connect MT2 to the Collector Terminal (C). To begin testing, perform the following procedures. Procedure 1: (+)V DRM , (+)I DRM , (-)V DRM , (-)I DRM Note: The (+) and (-) symbols are used to designate the polarity MT2 with reference to MT1. To measure the (+)V DRM , (+)I DRM , (-)V DRM , and (-)I DRM parameter: 1. Set Variable Collector Supply Voltage Range to appropriate Max Peak Volts for device under test. (Value selected should be equal to the device's V DRM rating.) WARNING: DO NOT exceed V DRM /V RRM rating of SCRs, Triacs, or Quadracs. These devices can be damaged. 2. Set Horizontal knob to sufficient scale to allow viewing of trace at the required voltage level. (The 100 V/DIV scale should be used for testing devices having a V DRM rating of 600 V or greater; the 50 V/DIV scale for testing parts rated from 30 V to 500 V, and so on.) 3. Set Mode to Leakage. 4. Set Polarity to (+). 5. Set Power Dissipation to 0.5 W. ( 0.4 W on 370) 6. Set Terminal Selector to Emitter Grounded-Open Base. 7. Set Vertical knob to ten times the maximum leakage current (I DRM ) specified for the device. Note: The CRT screen readout should show 1% of the maximum leakage current. The vertical scale is divided by 1,000 when leakage mode is used. Procedure 2: (+)V DRM , (+)I DRM To measure the (+)V DRM and (+)I DRM parameter: 1. Set Left-Right Terminal Jack Selector to correspond with 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 leakage current. (Figure AN1006.11) 50 nA 100 V E R T H O R I Z S T E P I DRM V DRM Figure AN1006.11 (+)I DRM = 205 nA at (+)V DRM = 600 V Procedure 3: (-)V DRM , (-)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 TM (Forward and Reverse) To measure the V TM (Forward and Reverse) parameter: 1. Set Terminal Selector Grounded. 2. Set Step/Offset Amplitude to twice the maximum I GT rating of the device (to insure the device turns on). 3. Set Variable Collector Supply Voltage Range to 15 V Max Peak volts. ( 16 V on 370) 4. Set Offset by depressing 0 (zero). 5. Set Rate by depressing Norm. 6. Set Step Family by depressing Rep (Repetitive). 7. Set Mode to Norm. 8. Set Horizontal knob to 0.5 V/DIV. 9. Set Power Dissipation to 220 W ( 100 W on 577). 10. Set Number of Steps to 1. 11. Set Step/Offset Polarity to non-inverted (button extended; on 577 button depressed). 12. Set Vertical knob to a sufficient setting to allow the viewing of 1.4 times the I T(RMS) rating of the device [I T(peak) on CRT]. Note the following: generated in this test, only parts with an I T(RMS) rating of Thyristor and Rectifier Testing Using Curve Tracers (continued)

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