HER257

HER251 - HER258 PRV : 50 - 1000 Volts Io : 2.5 Amperes FEATURES : * * * * * * High current capability High surge current capability High reliability Low reverse current Low forward voltage drop Fast switching for high efficiency HIGH EFFICIENT RECTIFIER DIODES D2A 0.161 (4.1) 0.154 (3.9) 1.00 (25.4) MIN. 0.284 (7.2) 0.268 (6.8) * Pb / RoHS Free MECHANICAL DATA : * Case : D2A Molded plastic * Epoxy : UL94V-O rate flame retardant * Lead : Axial lead solderable per MIL-STD-202, Method 208 guaranteed * Polarity : Color band denotes cathode end * Mounting position : Any * Weight : 0.645 gram 0.040 (1.02) 0.0385 (0.98) 1.00 (25.4) MIN. Dimensions in inches and ( millimeters ) Rating at 25 °C ambient temperature unless otherwise specified. Single phase, half wave, 60 Hz, resistive or inductive load. For capacitive load, derate current by 20%. MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS RATING Maximum Recurrent Peak Reverse Voltage Maximum RMS Voltage Maximum DC Blocking Voltage Maximum Average Forward Current 0.375"(9.5mm) Lead Length Ta = 55 °C Maximum Peak Forward Surge Current, 8.3ms Single half sine wave superimposed on rated load (JEDEC Method) Maximum Peak Forward Voltage at IF = 2.5 A Maximum DC Reverse Current at Rated DC Blocking Voltage Ta = 25 °C Ta = 100 °C SYMBOL VRRM VRMS VDC IF(AV) HER 251 50 35 50 HER 252 100 70 100 HER 253 200 140 200 HER 254 300 210 300 HER 255 400 280 400 HER 256 600 420 600 HER 257 800 560 800 HER 258 1000 700 1000 UNIT V V V A 2.5 IFSM VF IR IR(H) Trr 100 1.1 10 50 50 50 - 65 to + 150 - 65 to + 150 75 1.7 A V µA µA ns pf °C °C Maximum Reverse Recovery Time ( Note 1 ) Typical Junction Capacitance ( Note 2 ) Junction Temperature Range Storage Temperature Range CJ TJ TSTG Notes : ( 1 ) Reverse Recovery Test Conditions : IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A. ( 2 ) Measured at 1.0 MHz and applied reverse voltage of 4.0 VDC Page 1 of 2 Rev. 02 : March 24, 2005 RATING AND CHARACTERISTIC CURVES ( HER251 - HER258 ) FIG.1 - REVERSE RECOVERY TIME CHARACTERISTIC AND TEST CIRCUIT DIAGRAM 50 Ω 10 Ω + 0.5 A D.U.T. 50 Vdc (approx) 1Ω PULSE GENERATOR ( NOTE 2 ) OSCILLOSCOPE ( NOTE 1 ) 0 - 0.25 A Trr + - 1.0 A SET TIME BASE FOR 25-35 ns/cm NOTES : 1. Rise Time = 7 ns max., Input Impedance = 1 megaohm, 22 pF. 2. Rise time = 10 ns max., Source Impedance = 50 ohms. 3. All Resistors = Non-inductive Types. 1 cm FIG.2 - DERATING CURVE FOR OUTPUT RECTIFIED CURRENT AVERAGE FORWARD OUTPUT CURRENT, AMPERES 2.5 100 FIG.3 - MAXIMUM NON-REPETITIVE PEAK FORWARD SURGE CURRENT PEAK FORWARD SURGE CURRENT, AMPERES 8.3 ms SINGLE HALF SINE WAVE Ta = 50 °C 2.0 80 1.5 60 1.0 40 0.5 60Hz RESISTIVE OR INDUCTIVE LOAD 0 0 25 50 75 100 125 150 175 20 0 1 2 4 6 10 20 40 60 100 AMBIENT TEMPERATURE, ( °C) FIG.4 - TYPICAL FORWARD CHARACTERISTICS 10 Pulse Width = 300 µs 2% Duty Cycle TJ = 25 °C 10 NUMBER OF CYCLES AT 60Hz FIG.5 - TYPICAL REVERSE CHARACTERISTICS 100 TJ = 100 °C FORWARD CURRENT, AMPERES REVERSE CURRENT, MICROAMPERES 1.0 HER251-HER255 1.0 0.1 TJ = 25 °C HER256-HER258 0.1 0.01 0 20 40 60 80 100 120 140 PERCENT OF RATED REVERSE VOLTAGE, (%) 0.01 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 FORWARD VOLTAGE, VOLTS Page 2 of 2 Rev. 02 : March 24, 2005