Page 1
STPS40SM120C
Power Schottky rectifier
Datasheet − production data
Features
■ High current capability
■ Avalanche rated
■ Low forward voltage drop
■ High frequency operation
Description
This Schottky diode is suited for high frequency
switch mode power supply.
Packaged in TO-220AB, TO-220AB narrow leads
2
PAK, this device is intended to be used in
and I
notebook, game station and desktop adapters,
providing in these applications a good efficiency
at both low and high load.
Figure 1. Electrical characteristics
2 x I
I
"Forward"
O
V
I
(a)
X
A1
A2
K
A2
A1
K
TO-220AB narrow leads
STPS40SM120CTN
K
TO-220AB
STPS40SM120CT
K
K
A1
I2PAK
STPS40SM120CR
A2
A1
K
A2
K
I
F
I
V
RRM
V
V
a. V
ARM
operating area defined in Figure 9. V
pulse measurements (t
V
, are static characteristics
F
AR
and I
R
"Reverse"
must respect the reverse safe
ARM
O
< 10 µs). VR, IR, V
p
X
F
V
RRM
V
F(2xIo)
and
I
R
V
V
To
I
AR
V
F(Io)
and IAR are
AR
Table 1. Device summary
Symbol Value
I
F(AV)
V
RRM
(max) 150 °C
T
j
(typ) 0.46 V
V
F
2 x 20 A
120 V
April 2012 Doc ID 022917 Rev 1 1/9
This is information on a product in full production.
www.st.com
9
Page 2
Characteristics STPS40SM120C
1 Characteristics
Table 2. Absolute ratings (limiting values per diode at T
otherwise specified)
Symbol Parameter Value Unit
= 25 °C, unless
amb
V
I
F(RMS)
I
F(AV)
I
FSM
P
ARM
V
ARM
V
ASM
T
1. For pulse time duration deratings, please refer to Figure 4. More details regarding the avalanche energy
measurements and diode validation in the avalanche are provided in the STMicroelectronics Application
notes AN1768, “Admissible avalanche power of schottky diodes” and AN2025, “Converter improvement
using Schottky rectifier avalanche specification”.
2. See Figure 9
3. condition to avoid thermal runaway for a diode on its own heatsink
Table 3. Thermal resistance
Repetitive peak reverse voltage 120 V
RRM
Forward rms current 30 A
Average forward current, δ = 0.5
Per diode T
Per device T
= 125 °C 20
c
= 115 °C 40
c
Surge non repetitive forward current tp = 10 ms sinusoidal 210 A
(1)
Repetitive peak avalanche power Tj = 125 °C, tp = 10 µs 1150 W
Maximum repetitive peak
(2)
avalanche voltage
Maximum single-pulse
(2)
peak avalanche voltage
Storage temperature range -65 to +175 °C
stg
Maximum operating junction temperature
T
j
<
Rth(j-a)
1
dPtot
dTj
< 10 µs, Tj < 125 °C, IAR < 7.7 A 150 V
t
p
< 10 µs, Tj < 125 °C, IAR < 7.7 A 150 V
t
p
(3)
150 °C
Symbol Parameter Value Unit
R
R
Junction to case
th(j-c)
Coupling 0.50
th(c)
Per diode 1.35
°C/WTo t al 0 . 93
A
When the two diodes 1 and 2 are used simultaneously:
ΔT
(diode 1) = P(diode 1) x R
j
2/9 Doc ID 022917 Rev 1
(Per diode) + P(diode 2) x R
th(j-c)
th(c)
Page 3
STPS40SM120C Characteristics
Table 4. Static electrical characteristics (per diode)
Symbol Parameter Test conditions Min. Typ. Max. Unit
(1)
I
R
V
F
Reverse leakage current
(2)
Forward voltage drop
1. Pulse test: tp = 5 ms, δ < 2%
2. Pulse test: t
= 380 µs, δ < 2%
p
= 25 °C
T
j
= 125 °C - 20 50 mA
T
j
= 125 °C IF = 5 A - 0.46 0.51
T
j
T
= 125 °C
j
= 25 °C
T
j
= 125 °C - 0.63 0.69
T
j
V
= V
R
I
= 10 A
F
I
= 20 A
F
RRM
- 55 275 µA
- 0.55 0.60
-0.83
To evaluate the conduction losses use the following equation:
P = 0.52 x I
Figure 2. Average forward power dissipation
versus average forward current (per
diode)
P (W)
F(AV)
20
16
12
δ = 0.05
8
4
0
0 4 8 1216202428
δ = 0.2
δ = 0.1
Figure 4. Normalized avalanche power
derating versus pulse duration
+ 0.0085 x I
F(AV)
T
δ = t / T
p
δ = 0.5
t
p
F2(RMS)
δ = 1
I (A)
F(AV)
Figure 3. Average forward current versus
ambient temperature (δ = 0.5, per
diode)
I (A)
F(AV)
24
R
= R
th(j-a)
T (°C)
amb
th(j-c)
20
16
12
8
4
0
0 25 50 75 100 125 150
Figure 5. Relative variation of thermal
impedance junction to case versus
pulse duration
P(tp)
ARM
P (10 µs)
ARM
1
0.1
0.01
0.001
1 10 100 1000
t (µs)
p
Z/R
th(j-c) th(j-c)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
Single pulse
0.3
0.2
0.1
0.0
1.E-04 1.E-03 1.E-02 1.E-01 1.E+00
t (s)
p
V
Doc ID 022917 Rev 1 3/9
Page 4
Characteristics STPS40SM120C
Figure 6. Reverse leakage current versus
reverse voltage applied
(typical values, per diode)
I (mA)
R
1.E+02
Tj=150°C
1.E+01
1.E+00
1.E-01
1.E-02
1.E-03
0 102030405060708090100110120
Tj=125°C
Tj=100°C
Tj=75°C
Tj=50°C
Tj=25°C
V (V)
R
Figure 8. Forward voltage drop versus
forward current (per diode)
I (A)
FM
1000.0
100.0
10.0
1.0
0.1
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Tj=125°C
(Maximum values)
Tj=125°C
(Typical values)
Tj=25°C
(Maximum values)
V (V)
FM
Figure 7. Junction capacitance versus
reverse voltage applied
(typical values, per diode)
C(pF)
10000
1000
100
1 10 100 1000
V
F=1MHz
osc
Tj=25°C
Figure 9. Reverse safe operating area
(t
< 10 µs and Tj < 125 °C)
p
I (A)
arm
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
120 130 140 150 160 170
V (V)
arm
=30mV
V (V)
RMS
R
4/9 Doc ID 022917 Rev 1
Page 5
STPS40SM120C Package information
2 Package information
● Epoxy meets UL94, V0
● Cooling method: by conduction (C)
● Recommended torque value: 0.4 to 0.6 N·m
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com
ECOPACK
Table 5. TO-220AB narrow leads dimensions
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
.
Dimensions
Ref.
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 4.40 4.60 0.17 0.18
b 0.61 0.88 0.024 0.034
b1 0.95 1.20 0.037 0.047
c 0.48 0.70 0.019 0.027
D 15.25 15.75 0.60 0.62
D1 1.27 0.05
E 10.00 10.40 0.39 0.41
e 2.40 2.70 0.094 0.106
e1 4.95 5.15 0.19 0.20
F 1.23 1.32 0.048 0.052
L20
b1(x3)
E
P
Q
D
L30
L1
L
A
F
H1
D1
J1
1
23
e
e1
b (x3)
H1 6.20 6.60 0.24 0.26
C
J1 2.40 2.72 0.095 0.107
L 13.00 14.00 0.51 0.55
L1 2.60 2.90 0.102 0.114
L20 15.40 0.61
L30 28.90 1.14
∅P 3.75 3.85 0.147 0.151
Q 2.65 2.95 0.104 0.116
Doc ID 022917 Rev 1 5/9
Page 6
Package information STPS40SM120C
Devices in I2PAK with nickel-plated back frame must NOT be mounted by frame soldering
like SMDs. Such devices are intended to be through-hole mounted ONLY and in no
circumstances shall ST be held liable for any lack of performance or damage arising out of
soldering of nickel-plated back frames.
Table 6. I2PAK dimensions
Dimensions
L2
Ref.
Millimeters Inches
Min. Max. Min. Max.
A
E
c2
A 4.40 4.60 0.173 0.181
A1 2.40 2.72 0.094 0.107
b 0.61 0.88 0.024 0.035
D
b1 1.14 1.70 0.044 0.067
c 0.49 0.70 0.019 0.028
L1
L
b1
A1
c2 1.23 1.32 0.048 0.052
D 8.95 9.35 0.352 0.368
e 2.40 2.70 0.094 0.106
e1 4.95 5.15 0.195 0.203
b
e
e1
c
E 10 10.40 0.394 0.409
L 13 14 0.512 0.551
L1 3.50 3.93 0.138 0.155
L2 1.27 1.40 0.050 0.055
6/9 Doc ID 022917 Rev 1
Page 7
STPS40SM120C Package information
Table 7. TO-220AB dimensions
Dimensions
L2
F2
F1
F
G1
H2
Dia
G
L5
L9
L6
L4
Ref.
Millimeters Inches
Min. Max. Min. Max.
A 4.40 4.60 0.173 0.181
C 1.23 1.32 0.048 0.051
A
C
D 2.40 2.72 0.094 0.107
E 0.49 0.70 0.019 0.027
L7
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
D
G1 2.40 2.70 0.094 0.106
H2 10 10.40 0.393 0.409
L2 16.4 Typ. 0.645 Typ.
M
E
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.
Dia. 3.75 3.85 0.147 0.151
Doc ID 022917 Rev 1 7/9
Page 8
Ordering information STPS40SM120C
3 Ordering information
Table 8. Ordering information
Order code Marking Package Weight Base qty Delivery mode
STPS40SM120CTN PS40SM120CTN
STPS40SM120CT PS40SM120CT TO-220AB 1.9 g 50 Tube
STPS40SM120CR PS40SM120CR I
4 Revision history
Table 9. Document revision history
Date Revision Changes
02-Apr-2012 1 First issue.
TO-220AB
narrow leads
2
PAK 1.49 g 50 Tube
1.9 g 50 Tube
8/9 Doc ID 022917 Rev 1
Page 9
STPS40SM120C
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Doc ID 022917 Rev 1 9/9
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