Order this document by MBRF745/D SEMICONDUCTOR TECHNICAL DATA The SWITCHMODE Power Rectifier employs the Schottky Barrier principle in a large area metal-to-silicon power diode. State-of-the-art geometry features epitaxial construction with oxide passivation and metal overlay contact. Ideally suited for use as rectifiers in very low-voltage, high-frequency switching power supplies, free wheeling diodes and polarity protection diodes. * * * * * * * * * Highly Stable Oxide Passivated Junction Very Low Forward Voltage Drop High Junction Temperature Capability High dv/dt Capability Excellent Ability to Withstand Reverse Avalanche Energy Transients Guardring for Stress Protection Epoxy Meets UL94, VO at 1/8 Electrically Isolated. No Isolation Hardware Required. UL Recognized File #E69369(1) 1 Motorola Preferred Device SCHOTTKY BARRIER RECTIFIER 7.5 AMPERES 45 VOLTS 2 Mechanical Characteristics * Case: Epoxy, Molded * Weight: 1.9 grams (approximately) * Finish: All External Surfaces Corrosion Resistant and Terminal Leads are Readily Solderable * Lead Temperature for Soldering Purposes: 260C Max. for 10 Seconds * Shipped 50 units per plastic tube * Marking: B745 1 2 CASE 221E-01 ISOLATED TO-220 MAXIMUM RATINGS Rating Symbol Value Unit Peak Repetitive Reverse Voltage Working Peak Reverse Voltage DC Blocking Voltage VRRM VRWM VR 45 Volts Average Rectified Forward Current (Rated VR), TC = 105C IF(AV) 7.5 Amps Peak Repetitive Forward Current (Rated VR, Square Wave, 20 kHz), TC = 105C IFRM 15 Amps Non-repetitive Peak Surge Current (Surge applied at rated load conditions halfwave, single phase, 60 Hz) IFSM 150 Amps Peak Repetitive Reverse Surge Current (2.0 s, 1.0 kHz) Operating Junction and Storage Temperature Voltage Rate of Change (Rated VR) RMS Isolation Voltage (t = 1 second, R.H. 30%, TA = 25C)(2) Per Figure 3 Per Figure 4(1) Per Figure 5 IRRM 1.0 Amp TJ, Tstg - 65 to +150 C dv/dt 10000 V/s Viso1 Viso2 Viso3 4500 3500 1500 Volts RJC 4.2 C/W TL 260 C THERMAL CHARACTERISTICS Maximum Thermal Resistance, Junction to Case Lead Temperature for Soldering Purposes: 1/8 from Case for 5 Seconds (1) UL Recognized mounting method is per Figure 4. (2) Proper strike and creepage distance must be provided. SWITCHMODE is a trademark of Motorola, Inc. Preferred devices are Motorola recommended choices for future use and best overall value. Rev 1 Device Rectifier Motorola, Inc. 1996 Data 1 MBRF745 ELECTRICAL CHARACTERISTICS Characteristic Symbol Maximum Instantaneous Forward Voltage (3) (iF = 15 Amp, TC = 25C) (iF = 15 Amp, TC = 125C) (iF = 7.5 Amp, TC = 125C) vF Maximum Instantaneous Reverse Current (3) (Rated DC Voltage, TC = 25C) (Rated DC Voltage, TC = 125C) iR Max Unit Volts 0.84 0.72 0.57 mA 0.1 15 100 50 30 TJ = 150C TJ = 125C 20 10 7 5 75C 3 25C 2 1 0.7 0.5 0.2 0.4 0.6 0.8 1 iF, INSTANTANEOUS FORWARD VOLTAGE (VOLTS) Figure 1. Typical Forward Voltage 2 I R, REVERSE CURRENT (mA) i F, INSTANTANEOUS FORWARD CURRENT (AMPS) (3) Pulse Test: Pulse Width = 300 s, Duty Cycle 2.0% 1.2 10 125C 100C 1 75C 0.1 25C 0.01 0.001 0 10 20 30 VR, REVERSE VOLTAGE (VOLTS) 40 50 Figure 2. Typical Reverse Current Rectifier Device Data MBRF745 TEST CONDITIONS FOR ISOLATION TESTS* CLIP MOUNTED FULLY ISOLATED PACKAGE CLIP MOUNTED FULLY ISOLATED PACKAGE LEADS HEATSINK 0.107 MIN MOUNTED FULLY ISOLATED PACKAGE LEADS LEADS HEATSINK HEATSINK 0.107 MIN 0.110 MIN Figure 3. Clip Mounting Position for Isolation Test Number 1 Figure 4. Clip Mounting Position for Isolation Test Number 2 Figure 5. Screw Mounting Position for Isolation Test Number 3 * Measurement made between leads and heatsink with all leads shorted together. MOUNTING INFORMATION** 4-40 SCREW CLIP PLAIN WASHER HEATSINK COMPRESSION WASHER HEATSINK NUT 6a. Screw-Mounted 6b. Clip-Mounted Figure 6. Typical Mounting Techniques Laboratory tests on a limited number of samples indicate, when using the screw and compression washer mounting technique, a screw torque of 6 to 8 in . lbs is sufficient to provide maximum power dissipation capability. The compression washer helps to maintain a constant pressure on the package over time and during large temperature excursions. Destructive laboratory tests show that using a hex head 4-40 screw, without washers, and applying a torque in excess of 20 in . lbs will cause the plastic to crack around the mounting hole, resulting in a loss of isolation capability. Additional tests on slotted 4-40 screws indicate that the screw slot fails between 15 to 20 in . lbs without adversely affecting the package. However, in order to positively ensure the package integrity of the fully isolated device, Motorola does not recommend exceeding 10 in . lbs of mounting torque under any mounting conditions. **For more information about mounting power semiconductors see Application Note AN1040. Rectifier Device Data 3 MBRF745 PACKAGE DIMENSIONS SEATING PLANE -T- -B- F NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. C DIM A B C D F G H J K L N Q R S U S Q U A 1 2 3 H -Y- K G N L J R M B M MILLIMETERS MIN MAX 15.78 15.97 10.01 10.21 4.60 4.80 0.67 0.86 3.08 3.27 2.54 BSC 3.13 3.27 0.46 0.64 12.70 14.27 1.14 1.52 5.08 BSC 3.21 3.40 2.72 2.81 2.44 2.64 6.58 6.78 STYLE 1: PIN 1. CATHODE 2. N/A 3. ANODE D 2 PL 0.25 (0.010) INCHES MIN MAX 0.621 0.629 0.394 0.402 0.181 0.189 0.026 0.034 0.121 0.129 0.100 BSC 0.123 0.129 0.018 0.025 0.500 0.562 0.045 0.060 0.200 BSC 0.126 0.134 0.107 0.111 0.096 0.104 0.259 0.267 Y CASE 221E-01 ISSUE O Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. 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