STPS40L40CT/CW
July 1999 - Ed: 6A
LOW DROP POWER SCHOTTKY RECTIFIER
Dual center tap Schottky barrier rectifier designed
for high frequency Switched Mode Power Supplies
and DC to DC converters.
Packaged in TO-220AB and TO-247 this device is
intended for use in low voltage, high frequency
inverters, free-wheeling and polarity protection
applications.
DESCRIPTION
LOW FORWARD VOLTAGE DROP MEANING
VERY SMALL CONDUCTION LOSSES
LOW DYNAMIC LOSSES AS A RESULT OF
THE SCHOTTKY BARRIER
AVALANCHE RATED
FEATURES AND BENEFITS
Symbol
Parameter
Value
Unit
V
RRM
Repetitive peak reverse voltage
40
V
I
F(RMS)
RMS forward current
30
A
I
F(AV)
Average forward current
Tc = 130
C
= 0.5
Per diode
Per device
20
40
A
I
FSM
Surge non repetitive forward current
tp = 10 ms Sinusoidal
230
A
I
RRM
Repetitive peak reverse current
tp = 2
s square F = 1kHz
2
A
I
RSM
Non repetitive peak reverse current
tp = 100
s square
3
A
T
stg
Storage temperature range
- 65 to + 150
C
Tj
Maximum operating junction temperature *
150
C
dV/dt
Critical rate of rise of reverse voltage
10000
V/
s
ABSOLUTE RATINGS (limiting values, per diode)
I
F(AV)
2 x 20 A
V
RRM
40 V
Tj (max)
150 C
V
F
(max)
0.49 V
MAIN PRODUCTS CHARACTERISTICS
A1
K
A2
TO-247
STPS40L40CW
A1
K
A2
TO-220AB
STPS40L40CT
K
A2
A1
* :
dPtot
dTj
<
1
Rth
(
j
-
a
)
thermal runaway condition for a diode on its own heatsink
1/5
Symbol
Parameter
Tests Conditions
Min.
Typ.
Max.
Unit
I
R
*
Reverse leakage
current
Tj = 25
C
V
R
= V
RRM
0.8
mA
Tj = 100
C
30
70
mA
V
F
*
Forward voltage
drop
Tj = 25
C
I
F
= 20 A
0.53
V
Tj = 125
C
I
F
= 20 A
0.42
0.49
Tj = 25
C
I
F
= 40 A
0.69
Tj = 125
C
I
F
= 40 A
0.6
0.7
Pulse test : * tp = 380
s,
< 2%
To evaluate the conduction losses use the following equation :
P = 0.28 x I
F(AV)
+ 0.0105 I
F
2
(RMS)
STATIC ELECTRICAL CHARACTERISTICS (per diode)
Symbol
Parameter
Value
Unit
R
th (j-c)
Junction to case
Per diode
Total
1.5
0.8
C/W
R
th(c)
Coupling
0.1
C/W
THERMAL RESISTANCES
0
2
4
6
8
10 12 14 16 18 20 22 24
0
2
4
6
8
10
12
14
16
IF(av) (A)
PF(av)(W)
= 0.2
= 0.5
= 1
= 0.05
= 0.1
T
=tp/T
tp
Fig. 1: Average forward power dissipation versus
average forward current (per diode).
0
25
50
75
100
125
150
0
2
4
6
8
10
12
14
16
18
20
22
IF(av)(A)
Rth(j-a)=15C/W
Rth(j-a)=Rth(j-c)
Tamb(C)
T
=tp/T
tp
Fig. 2: Average current versus ambient
temperature (
= 0.5, per diode).
When the diodes 1 and 2 are used simultaneously :
Tj(diode 1) = P(diode1) x R
th(j-c)
(Per diode) + P(diode 2) x R
th(c)
STPS40L40CT/CW
2/5
1E-3
1E-2
1E-1
1E+0
0
25
50
75
100
125
150
175
200
225
250
IM(A)
Tc=25C
Tc=125C
Tc=75C
t(s)
I
M
t
=0.5
Fig. 3: Non repetitive surge peak forward current
versus overload duration (maximum values, per diode).
1E-4
1E-3
1E-2
1E-1
1E+0
0.0
0.2
0.4
0.6
0.8
1.0
tp(s)
Zth(j-c)/Rth(j-c)
= 0.1
= 0.2
= 0.5
Single pulse
T
=tp/T
tp
Fig. 4: Relative variation of thermal impedance
junction to case versus pulse duration.
0
5
10
15
20
25
30
35
40
1E-2
1E-1
1E+0
1E+1
1E+2
5E+2
IR(mA)
Tj=125C
Tj=75C
Tj=25C
Tj=150C
VR(V)
Fig. 5: Reverse leakage current versus reverse
voltage applied (typical values, per diode).
1
2
5
10
20
50
0.1
1.0
5.0
VR(V)
C(nF)
F=1MHz
Tj=25C
Fig. 6: Junction capacitance versus reverse
voltage applied (typical values, per diode).
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1
10
100
200
IFM(A)
Typical values
Tj=150C
Tj=125C
Tj=75C
Tj=25C
VFM(V)
Fig. 7: Forward voltage drop versus forward
current (maximum values, per diode).
STPS40L40CT/CW
3/5
PACKAGE MECHANICAL DATA
TO-220AB
A
C
D
L7
Dia
L5
L6
L9
L4
F
H2
G
G1
L2
F2
F1
E
M
REF.
DIMENSIONS
Millimeters
Inches
Min.
Max.
Min.
Max.
A
4.40
4.60
0.173
0.181
C
1.23
1.32
0.048
0.051
D
2.40
2.72
0.094
0.107
E
0.49
0.70
0.019
0.027
F
0.61
0.88
0.024
0.034
F1
1.14
1.70
0.044
0.066
F2
1.14
1.70
0.044
0.066
G
4.95
5.15
0.194
0.202
G1
2.40
2.70
0.094
0.106
H2
10
10.40
0.393
0.409
L2
16.4 typ.
0.645 typ.
L4
13
14
0.511
0.551
L5
2.65
2.95
0.104
0.116
L6
15.25
15.75
0.600
0.620
L7
6.20
6.60
0.244
0.259
L9
3.50
3.93
0.137
0.154
M
2.6 typ.
0.102 typ.
Diam.
3.75
3.85
0.147
0.151
Cooling method : C
Recommended torque value : 0.55m.N
Maximum torque value : 0.70 m.N
STPS40L40CT/CW
4/5
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of
use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by
implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to
change without notice. This publication supersedes and replaces all information previously supplied.
STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written ap-
proval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
1999 STMicroelectronics - Printed in Italy - All rights reserved.
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia
Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A.
http://www.st.com
Cooling method : C
Recommended torque value : 0.8m.N
Maximum torque value : 1.0m.N
PACKAGE MECHANICAL DATA
TO-247
F2
F1
V2
L4
L2
L1
L3
D
L
L5
M
E
H
V
V
A
Dia.
F3
F4
G
= =
F(x3)
REF.
DIMENSIONS
Millimeters
Inches
Min.
Typ. Max. Min.
Typ. Max.
A
4.85
5.15 0.191
0.203
D
2.20
2.60 0.086
0.102
E
0.40
0.80 0.015
0.031
F
1.00
1.40 0.039
0.055
F1
3.00
0.118
F2
2.00
0.078
F3
2.00
2.40 0.078
0.094
F4
3.00
3.40 0.118
0.133
G
10.90
0.429
H
15.45
15.75 0.608
0.620
L
19.85
20.15 0.781
0.793
L1
3.70
4.30 0.145
0.169
L2
18.50
0.728
L3
14.20
14.80 0.559
0.582
L4
34.60
1.362
L5
5.50
0.216
M
2.00
3.00 0.078
0.118
V
5
5
V2
60
60
Dia.
3.55
3.65 0.139
0.143
Ordering type
Marking
Package
Weight
Base qty
Delivery mode
STPS40L40CT
STPS40L40CT
TO-220AB
2g
50
Tube
STPS40L40CW STPS40L40CW
TO-247
4.4g
30
Tube
Epoxy meets UL94,V0
STPS40L40CT/CW
5/5
PDF 
ZIP