1
Rectifier Device Data
SWITCHMODE
TM
Power Rectifier
. . . designed for use in switching power supplies, inverters and as
free wheeling diodes, these stateoftheart devices have the
following features:
Ultrafast 28 Nanosecond Recovery Time
175
C Operating Junction Temperature
Popular TO220 Package
Epoxy Meets UL94, VO @ 1/8
High Temperature Glass Passivated Junction
High Voltage Capability to 400 Volts
Low Leakage Specified @ 150
C Case Temperature
Current Derating @ Both Case and Ambient Temperatures
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: UH840
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Peak Repetitive Reverse Voltage
Working Peak Reverse Voltage
DC Blocking Voltage
VRRM
VRWM
VR
400
Volts
Average Rectified Forward Current
Per Leg
Total Device, (Rated VR), TC = 120
C
Total Device
IF(AV)
4.0
8.0
Amps
Peak Repetitive Forward Current
Per Diode Leg
(Rated VR, Square Wave, 20 kHz), TC = 120
C
IFM
16
Amps
Nonrepetitive Peak Surge Current
(Surge applied at rated load conditions halfwave, single phase, 60 Hz)
IFSM
100
Amps
Controlled Avalanche Energy
WAVAL
20
mJ
Operating Junction Temperature and Storage Temperature
TJ, Tstg
*
65 to +175
C
THERMAL CHARACTERISTICS, PER DIODE LEG
Maximum Thermal Resistance, Junction to Case
R
JC
3.0
C/W
ELECTRICAL CHARACTERISTICS, PER DIODE LEG
Maximum Instantaneous Forward Voltage (1)
(iF = 4.0 Amps, TC = 150
C)
(iF = 4.0 Amps, TC = 25
C)
vF
1.9
2.2
Volts
Maximum Instantaneous Reverse Current (1)
(Rated dc Voltage, TC = 150
C)
(Rated dc Voltage, TC = 25
C)
iR
500
10
A
Maximum Reverse Recovery Time
(IF = 1.0 Amp, di/dt = 50 Amps/
s)
trr
28
ns
(1) Pulse Test: Pulse Width = 300
s, Duty Cycle
2.0%.
SWITCHMODE is a trademark of Motorola, Inc.
Preferred devices are Motorola recommended choices for future use and best overall value.
Motorola, Inc. 1996
Order this document
by MURH840CT/D
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
1
3
2, 4
MURH840CT
ULTRAFAST
RECTIFIER
8.0 AMPERES
400 VOLTS
CASE 221A06
TO220AB
Motorola Preferred Device
1
3
4
2
Rev 1
MURH840CT
2
Rectifier Device Data
Figure 1. Typical Forward Voltage
Figure 2. Typical Reverse Current, Per Leg
Figure 3. Forward Current Derating, Ambient, Per Leg
Figure 4. Current Derating, Case, Per Leg
50
20
10
0.1
0.2
0.5
1
2
5
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
vF, INSTANTANEOUS VOLTAGE (VOLTS)
i F
, INST
ANT
ANEOUS
FOR
W
ARD
CURRENT
(AMP)
TJ = 150
C
100
C
25
C
VR, REVERSE VOLTAGE (VOLTS)
I R
, REVERSE CURRENT
(
A
)
0.1
0
1000
0.2
0.5
1
5
10
20
50
100
200
500
50
100
150
200
250
300
350
400
I F(A
V)
, A
VERAGE
FOR
W
ARD
CURRENT
(AMPS)
TA, AMBIENT TEMPERATURE (
C)
0
60
2
4
6
7
1
80
100
120
140
160
180 200
TJ = 150
C
100
C
25
C
DC
SQUARE
WAVE
C, CAP
ACIT
ANCE
(pF)
VR, REVERSE VOLTAGE (VOLTS)
0.01
1000
100
10
1
0.1
1
10
100
2
100
Figure 5. Typical Capacitance, Per Leg
I F
,
A
VERAGE POWER DISSIP
A
TION
(W
A
TTS)
TC, CASE TEMPERATURE (
C)
0
110
2
4
6
8
10
120
130
140
150
160
170
180
RATED VR APPLIED
DC
SQUARE
WAVE
40
20
0
3
5
MURH840CT
4
Rectifier Device Data
PACKAGE DIMENSIONS
CASE 221A06
(TO220AB)
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION Z DEFINES A ZONE WHERE ALL
BODY AND LEAD IRREGULARITIES ARE
ALLOWED.
DIM
MIN
MAX
MIN
MAX
MILLIMETERS
INCHES
A
0.570
0.620
14.48
15.75
B
0.380
0.405
9.66
10.28
C
0.160
0.190
4.07
4.82
D
0.025
0.035
0.64
0.88
F
0.142
0.147
3.61
3.73
G
0.095
0.105
2.42
2.66
H
0.110
0.155
2.80
3.93
J
0.018
0.025
0.46
0.64
K
0.500
0.562
12.70
14.27
L
0.045
0.060
1.15
1.52
N
0.190
0.210
4.83
5.33
Q
0.100
0.120
2.54
3.04
R
0.080
0.110
2.04
2.79
S
0.045
0.055
1.15
1.39
T
0.235
0.255
5.97
6.47
U
0.000
0.050
0.00
1.27
V
0.045
1.15
Z
0.080
2.04
B
Q
H
Z
L
V
G
N
A
K
F
1
2 3
4
D
SEATING
PLANE
T
C
S
T
U
R
J
ISSUE Y
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