July 2011 Doc ID 4926 Rev 6 1/8
8
STPS40L15C
Low drop OR-ing power Schottky diode
Features
■Very low forward voltage drop for less power
dissipation and reduced heatsink size
■Reverse voltage suited to OR-ing of 3 V, 5 V
and 12 V rails
■Avalanche capability specified
Description
Dual center tap schottky rectifier packaged in
TO-220AB and TO-247, this device is especially
intended for use as OR-ing diode in fault tolerant
power supply equipments.
Table 1. Device summary
Symbol Value
IF(AV) 2x20 A
VRRM 15 V
Tj (max) 125 °C
VF (max) 0.33 V
A1 K
K
A2
A1
K
A2
A1
K
A2
TO-220AB
STPS40L15CT
TO-247
STPS40L15CW
www.st.com
Characteristics STPS40L15C
2/8 Doc ID 4926 Rev 6
1 Characteristics
To evaluate the conduction losses use the following equation :
P = 0.18 x IF(AV) + 0.008 IF2(RMS)
Table 2. Absolute ratings (limiting values, per diode)
Symbol Parameter Value Unit
VRRM Repetitive peak reverse voltage 15 V
IF(RMS) Forward current rms 30 A
IF(AV) Average forward current Tcase = 140 °C
δ = 1
Tot a l 4 0
A
Per diode 20
IFSM Surge non repetitive forward
current tp = 10 m, Sinusoidal 310 A
IRRM Peak repetitive reverse current tp = 2 µs, F= 1 kHz 2 A
IRSM Non repetitive peak reverse current tp = 100 µs 3 A
PARM Repetitive peak avalanche power tp = 1µs, Tj = 25 °C 13140 W
Tstg Storage temperature range -65 to + 150 °C
Tj Maximum operating junction temperature (1)
1. condition to avoid thermal runaway for a diode on its own heatsink
125 °C
dV/dt Critical rate of rise of reverse voltage 10000 V/µs
Table 3. Thermal resistances
Symbol Parameter Value Unit
Rth(j-c) Junction to case Per diode 1.6 °C/W
Total 0.85
Rth (c) Coupling 0.1 °C/W
Table 4. Static electrical characteristics (Per diode)
Symbol Parameter Tests conditions Min. Typ. Max. Unit
IR(1)
1. Pulse test : tp = 380 µs, δ < 2%
Reverse leakage
current
Tj = 25 °C VR = VRRM
6 mA
Tj = 100 °C 200 500
VF(1) Forward voltage drop
Tj = 25 °C IF = 19 A 0.41
V
Tj = 25 °C IF = 40 A 0.52
Tj = 125 °C IF = 19 A 0.28 0.33
Tj = 125 °C IF = 40 A 0.42 0.50
dPtot
dTj
--------------- 1
Rth j a–()
--------------------------
<
STPS40L15C Characteristics
Doc ID 4926 Rev 6 3/8
Figure 1. Average forward power dissipation
versus average forward current
(per diode)
Figure 2. Average forward current versus
ambient temperature
( δ = 1, per diode)
0 2 4 6 8 10121416182022
0
1
2
3
4
5
6
7
8PF(av)(W)
IF(av) (A)
δ= 1
δ= 0.5
δ= 0.2
δ= 0.1
δ= 0.05
T
δ=tp/T tp
0 25 50 75 100 125 150
0
2
4
6
8
10
12
14
16
18
20
22
Tamb(°C)
IF(av)(A)
Rth(j-a)=15°C/W
Rth(j-a)=Rth(j-c)
T
δ=tp/T tp
Figure 3. Normalized avalanche power
derating versus pulse duration
Figure 4. Normalized avalanche power
derating versus junction
temperature
0.001
0.01
0.10.01 1
0.1
10 100 1000
1
P(t
p)
P (1µs)
ARM
ARM
t (µs)
p
0
0.2
0.4
0.6
0.8
1
1.2
25 50 75 100 125 150
P(T)
P (25 °C)
ARM j
ARM
T (°C)
j
Figure 5. Non repetitive surge peak forward
current versus overload duration
(maximum values per diode)
Figure 6. Relative variation of thermal
impedance junction to case versus
pulse duration (per diode)
1E-3 1E-2 1E-1 1E+0
0
50
100
150
200
250
t(s)
IM(A)
Tc=50°C
Tc=75°C
Tc=110°C
IM
t
δ=0.5
1.0E-4 1.0E-3 1.0E-2 1.0E-1 1.0E+0
0.0
0.2
0.4
0.6
0.8
1.0
tp (s)
Zth(j-c)/Rth(j-c)
T
δ=tp/T tp
Single pulse
δ= 0.5
δ= 0.2
δ= 0.1
Characteristics STPS40L15C
4/8 Doc ID 4926 Rev 6
Figure 7. Reverse leakage current versus
reverse voltage applied (typical
values per diode)
Figure 8. Junction capacitance versus
reverse voltage applied (typical
values per diode)
0246810121416
1E-1
1E+0
1E+1
1E+2
5E+2 IR(mA)
Tj=100°C
Tj=25°C
VR(V)
12 51020
0.1
1.0
5.0
VR(V)
C(nF)
F=1MHz
Tj=25°C
Figure 9. Forward voltage drop versus
forward current (typical values per
diode)
Figure 10. Forward voltage drop versus
forward current (typical maximum
per diode)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
0.1
1.0
10.0
100.0
200.0
VFM(V)
IFM(A)
Tj=150°C
Tj=25°C
Tj=125°C
Tj=75°C
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8
1
10
100
200 IFM(A)
Tj=100°C
VFM(V)
STPS40L15C Package information
Doc ID 4926 Rev 6 5/8
2 Package information
●Epoxy meets UL94,V0
●Cooling method: by conduction (C)
●Recommended torque values for: TO-220AB 0.4 to 0.6 N·m
●Recommended torque values for: TO-247 0.9 to 1.2 N·m
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Table 5. TO-220AB dimensions
Ref.
Dimensions
Millimeters Inches
Min. Max. Min. Max.
A 4.40 4.60 0.173 0.181
C 1.23 1.32 0.048 0.106
D 2.40 2.72 0.094 0.009
E 0.49 0.70 0.019 0.037
F 0.61 0.88 0.024 0.067
F1 1.14 1.70 0.044 0.024
F2 1.14 1.70 0.044 0.054
G 4.95 5.15 0.194 0.368
G1 2.40 2.70 0.094 0.409
H2 10 10.40 0.393 0.208
L2 16.4 typ 0.645 typ
L4 13 14 0.511 0.055
L5 2.65 2.95 0.104 0.069
L6 15.25 15.75 0.600 0.126
L7 6.20 6.60 0.244
L9 3.50 3.93 0.137
M 2.6 typ. 0.102 typ.
Diam. 3.75 3.85 0.147 0.151
A
C
D
L7
Dia
L5
L6
L9
L4
F
H2
G
G1
L2
F2
F1
E
M
Package information STPS40L15C
6/8 Doc ID 4926 Rev 6
Table 6. TO-247 dimensions
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 0.031
E 0.40 0.80 0.015 0.009
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
V5° 5°
V2 60° 60°
Dia 3.55 3.65 0.139 0.143
F2
F1
V2
L4L2
L1
L3 D
L
L5
ME
H
V
V
A
Dia.
F3
F4
G
= =
F(x3)
STPS40L15C Ordering information
Doc ID 4926 Rev 6 7/8
3 Ordering information
4 Revision history
Table 7. Ordering information
Order code Marking Package Weight Base qty Delivery mode
STPS40L15CW STPS40L15CW TO-247 4.4 g 30 Tube
STPS40L15CT STPS40L15CT TO-220AB 2.2 g 50 Tube
Table 8. Document revision history
Date Revision Changes
July-2003 5A Previous edition.
18-Jul-2011 6 Added cathode indicator K to illustration for TO-220AB.
STPS40L15C
8/8 Doc ID 4926 Rev 6
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