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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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SWITCHMODETM Schottky Power Rectifier
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 Matched Dual Die Construction 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)
MBRF2545CT
Motorola Preferred Device
SCHOTTKY BARRIER RECTIFIER 25 AMPERES 45 VOLTS
1 2 3
1 2 3
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: B2545 MAXIMUM RATINGS, PER LEG
Rating Peak Repetitive Reverse Voltage Working Peak Reverse Voltage DC Blocking Voltage Average Rectified Forward Current (Rated VR), TC = 125C Peak Repetitive Forward Current (Rated VR, Square Wave, 20 kHz), TC = 125C Non-repetitive Peak Surge Current (Surge applied at rated load conditions halfwave, single phase, 60 Hz) 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 = 1.0 second, R.H. 30%, TA = 25C)(2) Per Figure 3 Per Figure 4(1) Per Figure 5 Total Device Symbol VRRM VRWM VR IF(AV) IFRM IFSM IRRM TJ, Tstg dv/dt Viso1 Viso2 Viso3
CASE 221D-02 ISOLATED TO-220
Value 45 12.5 25 25 150 1.0 - 65 to +150 10000 4500 3500 1500
Unit Volts
Amps Amps Amps Amp C V/s Volts
THERMAL CHARACTERISTICS, PER LEG
Maximum Thermal Resistance, Junction to Case Maximum 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.
RJC TL
3.5 260
C/W C
Rev 1
(c)RectifierInc. 1996 Data Motorola, Device
1
MBRF2545CT
ELECTRICAL CHARACTERISTICS, PER LEG
Characteristic Maximum Instantaneous Forward Voltage (3) Maximum Instantaneous Reverse Current (3) (iF = 12.5 Amps, TC = 25C) (iF = 12.5 Amps, TC = 125C) (Rated DC Voltage, TC = 25C) (Rated DC Voltage, TC = 125C) Symbol vF iR Max 0.7 0.62 0.2 40 Unit Volts mA
(3) Pulse Test: Pulse Width = 300 s, Duty Cycle 2.0%
i F , INSTANTANEOUS FORWARD CURRENT (AMPS)
100 70 50 20 10 7.0 5.0 2.0 1.0 0.7 0.5 0.2 0.1 0 0.2 0.4 0.6 0.8 vF, INSTANTANEOUS VOLTAGE (VOLTS) 1.0 TJ = 125C 25C 100C I R, REVERSE CURRENT (mA)
100
10
TJ = 125C 100C 85C
1.0
0.1 25C
0.01
0.001 0 10 20 30 40 VR, REVERSE VOLTAGE (VOLTS) 50
Figure 1. Typical Forward Voltage, Per Leg
Figure 2. Typical Reverse Current, Per Leg
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Rectifier Device Data
MBRF2545CT
TEST CONDITIONS FOR ISOLATION TESTS*
CLIP MOUNTED FULLY ISOLATED PACKAGE LEADS CLIP MOUNTED FULLY ISOLATED PACKAGE LEADS MOUNTED FULLY ISOLATED PACKAGE LEADS
0.107 MIN
0.107 MIN
HEATSINK 0.110 MIN
HEATSINK
HEATSINK
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 PLAIN WASHER CLIP
HEATSINK COMPRESSION WASHER NUT HEATSINK
6a. Screw-Mounted Figure 6. Typical Mounting Techniques
6b. Clip-Mounted
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
MBRF2545CT
PACKAGE DIMENSIONS
-T- F Q A
123
SEATING PLANE NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. DIM A B C D F G H J K L N Q R S U 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 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
-B-
C S U
H K -Y-
G N L D
3 PL M
J R
0.25 (0.010)
B
M
Y
STYLE 3: PIN 1. ANODE 2. CATHODE 3. ANODE
CASE 221D-02 (ISOLATED TO-220) ISSUE D
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. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. Mfax is a trademark of Motorola, Inc. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 303-675-2140 or 1-800-441-2447 MfaxTM: RMFAX0@email.sps.mot.com - TOUCHTONE 602-244-6609 INTERNET: http://Design-NET.com JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, 6F Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 81-3-3521-8315 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298
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MBRF2545CT/D Rectifier Device Data

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