E8 DO-35 DO-214 Diac HT and ST Series RoHS E8 General Description Teccor's HT and ST Series of bilateral trigger diacs offer a range of voltage characteristics from 27 V to 70 V. A diac semiconductor is a full-wave or bidirectional thyristor. It is triggered from a blocking state to a conduction state for either polarity of applied voltage whenever the amplitude of applied voltage exceeds the breakover voltage rating of the diac. The Teccor line of diacs features glass-passivated junctions to ensure long-term reliability and parameter stability. Teccor's glass offers a rugged, reliable barrier against junction contamination. The diac specifications listed in this data sheet are for standard products. Special parameter selections such as close tolerance voltage symmetry are available. Consult the factory for more information about custom design applications. Features * * * * RoHS Compliant Bilateral triggering device Glass-passivated junctions Wide voltage range selections ST Series * * Epoxy SMT package High-temperature, solder-bonded die attachment HT Series * * 2004 Littelfuse, Inc. Thyristor Product Catalog E8 - 1 DO-35 trigger package Pre-tinned leads http://www.littelfuse.com +1 972-580-7777 Diac Data Sheets Electrical Characteristics TC = 25C Part No. VBO VBO VBB IBO ITRM Breakover Voltage (Forward and Reverse) Breakover Voltage Symmetry VBO = [ | +VBO | - | - VBO | ] Dynamic Breakback Voltage (3) | V | Peak Breakover Current at Breakover Voltage Peak Pulse Current for 10 s 120 PPS TA 40 C DO-35 DO-214 Volts Volts Amps Amps MIN MAX MAX MIN MAX MAX HT-32 ST-32 27 37 3 (1) 10 (2) 25 2 28 36 2 (1) 7 at 10 mA (4) 25 2 Volts HT-32A / HT-5761 HT-32B / HT-5761A ST-32B 30 34 2 (1) 7 at 10 mA (4) 25 2 HT-34B ST-34B 32 36 2 (1) 10 (2) 25 2 HT-35 ST-35 30 40 3 (1) 10 (2) 25 2 HT-36A / HT-5762 ST-36A 32 40 2 (1) 7 at 10 mA (4) 25 2 HT-36B ST-36B 34 38 2 (1) 10 (2) 25 2 HT-40 ST-40 35 45 3 (1) 10 (2) 25 2 56 70 4 20 (2) 25 1.5 HT-60 General Notes * Lead solder temperature is +230 C for 10-second maximum; 1/16" (1.59 mm) from case. * See "Package Dimensions" section of this catalog. Current 10 mA Electrical Specification Notes (1) Breakover voltage symmetry as close as 1 V is available from the factory on these products. (2) See Figure E8.4 and Figure E8.5 for test circuit and waveforms. (3) Typical switching time is 900 nano-seconds measured at IPK (Figure E8.4) across a 20 resistor (Figure E8.5). Switching time is defined as rise time of IPK between the 10% to 90% points. (4) See V-I Characteristics. V Breakover Current IBO -VBO Voltage +VBO Breakover Voltage VBO Bilateral Trigger DIAC Specifications * Maximum Ratings, Absolute-Maximum Values V-I Characteristics - Maximum Trigger Firing Capacitance: 0.1 F - Device dissipation (at TA = -40 C to +40 C): 250 mW for DO-35 and 300 mW for DO-214 - Derate above +40 C: 3.6 mW/C for DO-35 and 3 mW/C for DO-214 * HT and ST Series Thermal Resistance Junction to Lead - RJL: C/W Junction to Ambient [RJA]: C/W (based on maximum lead temperature of 90 C for DO-214 and 85 C for DO-35 devices) Temperature Ranges Storage: -40 C to +125 C Operating (Junction): -40 C to +125 C Y Package S Package DO-35 DO-214 100 [278] C/W 65 C/W * * Mounted on 1 cm2 copper foil surface; two-ounce copper foil http://www.littelfuse.com +1 972-580-7777 E8 - 2 2004 Littelfuse, Inc. Thyristor Product Catalog Data Sheets Diac LOAD -- Up to 1500 W 3.3 k Triac Q2015L5 MT2 200 k 120 V ac 60 Hz G MT1 HT-35 Bilateral Trigger Diac 0.1 F 100 V Figure E8.1 Typical Diac/Triac Full-wave Phase Control Circuit Using Lower Voltage Diacs. 10 Repetitive Peak On-state Current (ITRM) - Amps 5.0 3.0 2.0 1.0 HT-32x, -34x, -35, -36x, -40 HT-5761, -5761A, -5762 ST-32x, -34x, -35, -36x, -40 0.5 0.3 0.2 HT-60 0.1 0.05 Safe Operating Area 0.03 0.02 .01 .005 .003 .002 .001 PULSE REPETITION RATE = 120 pps TA = 40 C 1 2 4 6 10 20 40 60 100 200 400 6001000 2000 4000 10000 Base Pulse Duration - s Figure E8.2 Repetitive Peak On-state Current versus Pulse Duration 2004 Littelfuse, Inc. Thyristor Product Catalog E8 - 3 http://www.littelfuse.com +1 972-580-7777 Diac Data Sheets Percentage of VBO Change - % +8 47 k +6 * 100 k +4 D.U.T. +2 HT Series RL 0 ST Series CT VC -2 -4 0.1 F IL 120 V rms 60 Hz -6 20 1% -8 -40 -20 0 +20 +40 +60 +80 +100 +120 +140 * Adjust for one firing in each half cycle. D.U.T. = Diac Junction Temperature (TJ) - C Figure E8.3 Normalized VBO Change versus Junction Temperature V +V Figure E8.5 Circuit Used to Measure Diac Characteristics (Refer to Figure E8.4.) C 300 BO Peak Output Current (IPK) - mA V+ t 0 V-V BO I L +I PK 0 t 250 200 ) e vic 150 al 100 pic V (35 De Ty 50 0 -I .01 .02 .03 .04 .05 .06 .07 .08 .09 .10 PK Triggering Capacitance (CT) - F Typical pulse base width is 10 s Figure E8.4 Test Circuit Waveforms (Refer to Figure E8.5.) http://www.littelfuse.com +1 972-580-7777 Figure E8.6 Peak Output Current versus Triggering Capacitance (Per Figure E8.5 with RL of 20 ) E8 - 4 2004 Littelfuse, Inc. Thyristor Product Catalog