1N4937 Axial-Lead Fast-Recovery Rectifier Axial- lead, fast- recovery rectifiers are designed for special applications such as dc power supplies, inverters, converters, ultrasonic systems, choppers, low RF interference and free wheeling diodes. A complete line of fast recovery rectifiers having typical recovery time of 150 nanoseconds providing high efficiency at frequencies to 250 kHz. Mechanical Characteristics • Case: Epoxy, Molded • Weight: 0.4 gram (approximately) • Finish: All External Surfaces Corrosion Resistant and Terminal Leads are Readily Solderable • Lead and Mounting Surface Temperature for Soldering Purposes: • • • • 220°C Max. for 10 Seconds, 1/16″ from case Shipped in plastic bags, 1000 per bag. Available Tape and Reeled, 5000 per reel, by adding a “RL” suffix to the part number Polarity: Cathode Indicated by Polarity Band Marking: 1N4937 1 FAST RECOVERY RECTIFIER 1.0 AMPERE 600 VOLTS 1N4937 MAXIMUM RATINGS (Note 1) Rating Symbol *Peak Repetitive Reverse Voltage Working Peak Reverse Voltage DC Blocking Voltage VRRM VRWM VR *Non-Repetitive Peak Reverse Voltage RMS Reverse Voltage Unit 1N4937 Volts 600 VRSM VR(RMS) 650 420 Volts IO 1.0 Amp *Non-Repetitive Peak Surge Current (Surge applied at rated load conditions) IFSM 30 Amps Operating Junction Temperature Range Storage Temperature Range TJ Tstg - 65 to +150 - 65 to +150 °C *Average Rectified Forward Current (Single phase, resistive load, TA = 75°C) (Note 2) THERMAL CHARACTERISTICS Characteristic Thermal Resistance, Junction to Ambient (Typical Printed Circuit Board Mounting) Symbol Max Unit RθJC 65 °C/W ELECTRICAL CHARACTERISTICS Characteristic Symbol Min Typ Max Unit Instantaneous Forward Voltage (IF = 3.14 Amp, TJ = 125°C) vF - 1.0 1.2 Volts Forward Voltage (IF = 1.0 Amp, TA = 25°C) VF - 1.0 1.1 Volts IR - 1.0 50 5.0 100 µA Symbol Min Typ Max Unit - 150 175 200 300 - 1.0 2.0 *Reverse Current (Rated dc Voltage) TA = 25°C TA = 100°C *REVERSE RECOVERY CHARACTERISTICS Characteristic Reverse Recovery Time (IF = 1.0 Amp to VR = 30 Vdc) (IFM = 15 Amp, di/dt = 10 A/µs) trr Reverse Recovery Current (IF = 1.0 Amp to VR = 30 Vdc) IRM(REC) 1. Ratings at 25°C ambient temperature unless otherwise specified. 2. Derate by 20% for capacitive loads. *Indicates JEDEC Registered Data for 1N4933 Series. 2 ns Amp 1N4937 PACKAGE DIMENSIONS AXIAL LEAD B K D F NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. 59−04 OBSOLETE, NEW STANDARD 59−09. 4. 59−03 OBSOLETE, NEW STANDARD 59−10. 5. ALL RULES AND NOTES ASSOCIATED WITH JEDEC DO−41 OUTLINE SHALL APPLY 6. POLARITY DENOTED BY CATHODE BAND. 7. LEAD DIAMETER NOT CONTROLLED WITHIN F DIMENSION. DIM A B D F K A F K 3 INCHES MIN MAX 0.161 0.205 0.079 0.106 0.028 0.034 −−− 0.050 1.000 −−− MILLIMETERS MIN MAX 4.10 5.20 2.00 2.70 0.71 0.86 −−− 1.27 25.40 −−−