MOTOROLA MBRF745

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.
•
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•
•
•
•
•
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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: 260°C 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 = 105°C
IF(AV)
7.5
Amps
Peak Repetitive Forward Current (Rated VR, Square Wave, 20 kHz), TC = 105°C
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 µs, 1.0 kHz)
Operating Junction and Storage Temperature
Voltage Rate of Change (Rated VR)
RMS Isolation Voltage (t = 1 second, R.H. ≤ 30%, TA = 25°C)(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/µs
Viso1
Viso2
Viso3
4500
3500
1500
Volts
RθJC
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 = 25°C)
(iF = 15 Amp, TC = 125°C)
(iF = 7.5 Amp, TC = 125°C)
vF
Maximum Instantaneous Reverse Current (3)
(Rated DC Voltage, TC = 25°C)
(Rated DC Voltage, TC = 125°C)
iR
Max
Unit
Volts
0.84
0.72
0.57
mA
0.1
15
100
50
30
TJ = 150°C
TJ = 125°C
20
10
7
5
75°C
3
25°C
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 µs, Duty Cycle ≤ 2.0%
1.2
10
125°C
100°C
1
75°C
0.1
25°C
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
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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
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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.
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4
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MBRF745/D
Rectifier Device
Data