DB3 STMicroelectronics

DB3 DB4 SMDB3 DIAC FEATURES n V : 32V and 40V BO n LOW BREAKOVER CURRENT DO-35 DESCRIPTION (DB3 and DB4) Functioning as a trigger diode with a fixed voltage reference, the DB3/DB4 series can be used in conjunction with triacs for simplified gate control circuits or as a starting element in fluorenscent 2 lamp ballasts. 3 A new surface mount version is now available in 1 SOT-23 package, providing reduced space and compatibility with automatic pick and place SOT-23 equipment. (SMDB3)* Pin 1 and 3 must be shorted together ABSOLUTE MAXIMUM RATINGS (limiting values) Symbol Parameter Value Unit I Repetitive peak on-state current SMDB3 1.00 A TRM tp=20 s F= 120 Hz DB3 / DB4 2.00 Tstg Storage temperature range -40to+125 C Tj Operating junction temperature range Note: * SMDB3 indicated as Preliminary spec as product is still in development stage. 1/5 October 2001 - Ed: 2BDB3 DB4 SMDB3 ELECTRICAL CHARACTERISTICS (Tj = 25C unless otherwise specified) Symbol Parameter Test Conditions SMDB3 DB3 DB4 Unit V Breakover voltage * C = 22nF ** MIN. 28 28 35 V BO TYP. 32 32 40 MAX. 36 36 45 IV -V I Breakover voltage C = 22nF ** MAX. 3 V BO1 BO2 symmetry V Dynamic breakover V and V at 10mA MIN. 10 5 V BO F voltage * V Output voltage * see diagram 2 MIN. 10 5 V O (R=20) I Breakover current * C = 22nF ** MAX. 10 50 A BO tr Rise time * see diagram 3 MAX. 0.50 2 s I Leakage current * V = 0.5 V max MAX. 1 10 A R R BO I Peak current * see diagram 2 (Gate) MIN. 1 0.30 A P * Applicable to both forward and reverse directions. ** Connected in parallel to the device. PRODUCT SELECTOR Part Number V Package BO SMDB3 28 - 36 SOT-23 DB3 28 - 36 DO-35 DB4 35 - 45 DO-35 ORDERING INFORMATION SM DB 3 Surface Breakover voltage Mount 3: VBO typ = 32V Version 4: VBO typ = 40V Diac Series 2/5