Characteristics
40L45CW Units
Major Ratings and Characteristics
Description/Features
The 40L45CW center tap Schottky rectifier has been opti-
mized for very low forward voltage drop, with moderate
leakage. The proprietary barrier technology allows for reliable
operation up to 150 C junction temperature. Typical applica-
tions are in switching power supplies.
150 C T
J
operation
Center tap TO-247 package
High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
Very low forward voltage drop
High frequency operation
Guard ring for enhanced ruggedness and long term
reliability
Dimensions in millimeters and inches
Conform to JEDEC outline TO-247AC (TO-3P)
2
BASE
COMMON
CATHODE
1
2
3
ANODE
COMMON
CATHODE
ANODE
1
2
1 5 .9 0 ( 0 . 62 6 )
1 5 .3 0 ( 0 . 60 2 )
1 4 . 2 0 ( 0 . 5 5 9 )
1 4 . 8 0 ( 0 . 58 3 )
3 . 7 0 ( 0 . 14 5 )
4 . 3 0 ( 0 . 1 7 0 )
5 .3 0 ( 0 .2 0 8 )
5 . 7 0 ( 0 .2 2 5 )
5 .5 0 ( 0 .2 1 7 )
4 . 5 0 ( 0 .1 7 7 )
( 2 P L C S .)
3. 5 5 ( 0 .1 3 9 )
3 . 6 5 ( 0 .1 4 4 )
2 . 2 0 ( 0 .0 8 7 )
M A X .
1 . 00 ( 0 .0 3 9)
1 . 4 0 ( 0 . 0 5 6 )
0. 4 0 ( 0 .2 1 3 )
0 . 8 0 ( 0 .0 3 2 )
4 .7 0 ( 0 . 1 85 )
5 . 3 0 ( 0 . 2 0 9 )
1 . 5 ( 0 . 0 5 9 )
2 .5 ( 0. 0 9 8 )
2 . 40 ( 0 .0 9 5)
M A X .
1 0 . 8 6 ( 0 .4 2 7 )
1 0 . 9 4 ( 0 .4 3 0 )
2 0 .3 0 ( 0 . 8 0 0 )
1 9 .7 0 ( 0 . 7 7 5 )
D IA.
1
2
3
TO-247AC
I
F(AV)
Rectangular
40
A
waveform
V
RRM
45
V
I
FSM
@ tp = 5 s sine
1240
A
V
F
@
20 Apk, T
J
=125C
0.42
V
(per leg, Typical)
T
J
- 55 to 150
C
SCHOTTKY RECTIFIER
40L45CW
PD-20566 rev. A 11/99
2 x 20 Amps
40L45CW
PD-20566 rev. A 11/99
2
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Part number
40L45CW
V
R
Max. DC Reverse Voltage (V)
V
RWM
Max. Working Peak Reverse Voltage (V)
45
T
J
Max. Junction Temperature Range
-55 to 150
C
T
stg
Max. Storage Temperature Range
-55 to 150
C
R
thJC
Max. Thermal Resistance Junction
1.6
C/W DC operation
* See Fig. 4
to Case (Per Leg)
R
thJC
Max. Thermal Resistance Junction
0.8
C/W DC operation
to Case (Per Package)
R
thCS
Typical Thermal Resistance, Case
0.24
C/W Mounting surface , smooth and greased
to Heatsink
wt
Approximate Weight
6 (0.21)
g (oz.)
T
Mounting Torque
Min.
6 (5)
Non-lubricated threads
Max.
12 (10)
Case Style
TO-247AC(TO-3P) JEDEC
Thermal-Mechanical Specifications
Kg-cm
(Ibf-in)
Parameters
40L45CW
Units
Conditions
Absolute Maximum Ratings
Following any rated
load condition and with
rated V
RRM
applied
Parameters
40L45CW
Units
Conditions
A
Typ. Max.
V
FM
Forward Voltage Drop
0.48 0.53
V
@ 20A
(Per Leg) * See Fig. 1
(1)
0.61 0.69
V
@ 40A
0.42 0.49
V
@ 20A
0.60 0.70
V
@ 40A
I
R M
Reverse Leakage Current
-
1.5
mA
T
J
= 25 C
(Per Leg) * See Fig. 2
(1)
20
80
mA
T
J
= 100 C
V
F(TO)
Threshold Voltage
0.27
V
T
J
=
T
J
max.
r
t
Forward Slope Resistance
8.72
m
C
T
Max. Junction Capacitance (Per Leg)
-
1500
pF
V
R
= 5V
DC
, (test signal range 100Khz to 1Mhz) 25C
L
S
Typical Series Inductance (Per Leg)
7.5
-
nH
Measured lead to lead 5mm from package body
dv/dt Max. Voltage Rate of Change
10,000
V/ s
(Rated V
R
)
T
J
= 25 C
T
J
= 125 C
V
R
= rated V
R
Parameters
40L45CW
Units
Conditions
(1) Pulse Width < 300s, Duty Cycle <2%
Voltage Ratings
Electrical Specifications
I
F(AV)
Max. Average Forward
(Per Leg)
20
A
50% duty cycle @ T
C
= 122 C, rectangular wave form
Current * See Fig. 5
(Per Device)
40
I
FSM
Max. Peak One Cycle Non-Repetitive
1240
5s Sine or 3s Rect. pulse
Surge Current (Per Leg) * See Fig. 7
350
10ms Sine or 6ms Rect. pulse
E
AS
Non-Repetitive Avalanche Energy
20
mJ
T
J
= 25 C, I
AS
= 3 Amps, L = 4.4 mH
(Per Leg)
I
AR
Repetitive Avalanche Current
3
A
Current decaying linearly to zero in 1 sec
(Per Leg)
Frequency limited by T
J
max. V
A
= 1.5 x V
R
typical
40L45CW
PD-20566 rev. A 11/99
3
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Fig. 2 - Typical Values Of Reverse Current
Vs. Reverse Voltage (Per Leg)
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage (Per Leg)
Fig. 4 - Max. Thermal Impedance Z
thJC
Characteristics (Per Leg)
Fig. 1 - Max. Forward Voltage Drop Characteristics
(Per Leg)
100
1000
10000
0
10
20
30
40
50
R
T
J
u
n
c
t
i
o
n
C
apac
i
t
an
c
e
-
C
(
pF
)
Reverse Voltage - V (V)
T = 25C
J
1
10
100
1000
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
I
n
s
t
an
t
a
n
e
o
u
s
F
o
r
w
ar
d C
u
r
r
e
n
t
-
I
(
A
)
F
FM
T = 150C
T = 125C
T = 25C
J
J
J
Forward Voltage Drop - V (V)
0.001
0.01
0.1
1
10
100
1000
0
5 10 15 20 25 30 35 40 45
R
R
125C
100C
75C
50C
25C
R
e
v
e
rs
e
C
u
rr
en
t
-
I
(
m
A
)
Reverse Voltage - V (V)
T = 150C
J
0.01
0.1
1
10
0. 00001
0.0001
0.001
0.01
0.1
1
10
100
th
J
C
Single Pulse
(Thermal Resistance)
1
T
h
e
r
m
a
l
I
m
p
e
d
a
n
c
e
Z
(C
/
W
)
D = 0.75
D = 0.50
D = 0.33
D = 0.25
D = 0.20
t , Rectangular Pulse Duration (Seconds)
1
2
C
thJC
DM
J
2
t
1
t
P
DM
Notes:
1. Duty factor D = t / t
2. Peak T = P x Z + T
40L45CW
PD-20566 rev. A 11/99
4
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Fig. 7 - Max. Non-Repetitive Surge Current (Per Leg)
Fig. 5 - Max. Allowable Case Temperature
Vs. Average Forward Current (Per Leg)
Fig. 8 - Unclamped Inductive Test Circuit
Fig. 6 - Forward Power Loss Characteristics
(Per Leg)
FREE-WHEEL
DIODE
40HFL40S02
C URRENT
MON ITOR
HIGH-SPEED
SWITCH
IRFP460
L
DUT
Rg = 25 ohm
V d = 25 V olt
+
(2) Formula used: T
C
= T
J
- (Pd + Pd
REV
) x R
thJC
;
Pd = Forward Power Loss = I
F(AV)
x V
FM
@ (I
F(AV)
/
D) (see Fig. 6);
Pd
REV
= Inverse Power Loss = V
R1
x I
R
(1 - D); I
R
@ V
R1
= 80% rated V
R
0
2
4
6
8
10
12
14
16
18
0
5
10
15
20
25
30
DC
A
v
e
r
ag
e
P
o
w
e
r
L
o
s
s
-
(
W
a
t
t
s
)
F(AV)
RMS Limit
D = 0.20
D = 0.25
D = 0.33
D = 0.50
D = 0.75
Average Forward Current - I (A)
100
110
120
130
140
150
0
5
10
15
20
25
30
DC
A
l
l
o
w
a
b
l
e
C
a
s
e
T
em
p
e
ra
t
u
r
e
-
(
C
)
F(AV )
see note (2)
Average Forward Current - I (A)
Square wave (D = 0.50)
80% Rated V applied
R
10 0
1 0 00
10 0 00
10
1 00
1 0 00
1 00 00
FS
M
N
o
n
-
R
e
pe
t
i
t
i
v
e
S
u
r
g
e
C
u
r
r
e
n
t
-
I
(
A
)
p
At Any Rated Load Condition
And With Rated V Applied
Following Surge
RRM
Square Wave Pulse Duration - t (microsec)
40L45CW
PD-20566 rev. A 11/99
5
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Fax-On-Demand: +44 1883 733420 Data and specifications subject to change without notice.
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