DB3 DC COMPONENTS CO., LTD. R THRU RECTIFIER SPECIALISTS DB4 TECHNICAL SPECIFICATIONS OF BIDIRECTIONAL DIODE THYRISTORS (DIACS) FEATURES * Glass passivalted three-layer for triggering thyristors. * Low breakover current at breakover voltage. * For use in thyristor phase-control circuit for lampdimming, universal-motor speed control and heat controls. DO-35 MECHANICAL DATA * Case: Glass sealed case * Lead: MIL-STD-202E, Method 208 guaranteed .020 (0.5) 1.0(25.4) MIN. * Mounting position: Any * Weight: 0.15 gram TYP. .165(4.2) MAX. .079 (2.0) MAX. 1.0(25.4) MIN. MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS Ratings at 25 o C ambient temperature unless otherwise specified. Single phase, half wave, 60 Hz, resistive or inductive load. For capacitive load, derate current by 20%. Dimensions in inches and (millimeters) PARAMETERS SYMBOL DB3 DB4 UNITS 28 35 Min 32 40 Typ 36 45 VOLT Breakover Voltage +VBO, -VBO Max VOLT Breakover Voltage Symmetry (+VBO)-(-VBO) 3 3 Max VOLT Dynamic Breakback Voltage VBO - VBR 5 5 Min Breakover Current +IBO, -IBO 100 100 Max IP 2.0 2.0 uA Peak Pulse Current for 10uS, 120pps, TA<=40 o C AMP Max RATING AND CHARACTERISTIC CURVES ( DB3 THRU DB4 ) FIG.1-V-I CHARACTERISTICS CURRENT FIG.2-REPETITIVE PEAK ON-STATE CURRENT VS PULSE DURATION 2.0 1.0 0.7 0.5 0.3 0.2 0.1 .07 .05 .03 .02 .01 .007 .005 .003 .002 .001 BREAKOVER VOLTAGE +5mA +IBo -VBo VOLTAGE -VBR +VBR -IBo +VBo -5mA PULSE REPEAT ON RATE =120 PPS Tz=400C D28 32 35 40&50 D60 SAFE OPERATING AREA 10 100 1000 10,000 FIG.4-TEST CIRCUIT WAVE FORMS (SEE FIG.5) FIG.3-NORMALIZED VBO CHANGE VS JUNCTION TEMPERATURE +8 +V(BO) aV+ +6 D28 32 35 40 50 0 +4 D60 +2 t aV- -V(BO) 0 +IP -2 -4 t 0 -6 -IP -8 -40 -20 0 +20 +40 +60 +80 +100 +120 +140 FIG.5-CIRCUIT USED TO MEASURE DIAC CHARACTERISTICS RF D.U.T. Vc 120V RMS 60Hz 200Ω 0.1u f 1% *ADJUST FOR ONE FIRING IN HALF CYCLE DC COMPONENTS CO., LTD. R