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STPS20SM120S
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.
2
Packaged in TO-220AB narrow leads and I
this device is intended to be used in 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
PA K,
(a)
X
A
A
K
K
A
A
K
TO-220AB narrow leads
STPS20SM120STN
Table 1. Device summary
STPS20SM120SR
Symbol Value
I
F(AV)
V
RRM
(typ) 0.49 V
V
F
(max) 150 °C
T
j
K
I2PAK
20 A
120 V
A
K
A
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
I
R
V
To
I
AR
V
F(Io)
AR
X
V
V
V
F(2xIo)
F
and IAR are
and
RRM
April 2012 Doc ID 022921 Rev 1 1/8
This is information on a product in full production.
www.st.com
8
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Characteristics STPS20SM120S
1 Characteristics
Table 2. Absolute ratings (limiting values with terminals 1 and 3 short circuited at
T
= 25 °C, unless otherwise specified)
amb
Symbo
l
Parameter Value Unit
V
I
F(RMS)
I
I
P
ARM
V
ARM
V
ASM
1. For pulse time duration deratings, please refer to Figure 4. More details regarding the avalanche energy
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 50 A
Average forward current, δ = 0.5 Tc = 120 °C 20 A
F(AV)
Surge non repetitive forward current tp = 10 ms sinusoidal, Tc = 25 °C 220 A
FSM
(1)
Repetitive peak avalanche power Tj = 125 °C, tp = 10 µs 900 W
Maximum repetitive
(2)
peak avalanche voltage
Maximum single-pulse
(2)
peak avalanche voltage
T
Storage temperature range
stg
TjMaximum operating junction temperature
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”.
<
Rth(j-a)
1
dPtot
dTj
< 10 µs, Tj < 125 °C, IAR < 6A 150 V
t
p
< 10 µs, Tj < 125 °C, IAR < 6A 150 V
t
p
-65 to
+175
(3)
150 °C
Symbol Parameter Value Unit
R
Table 4. Static electrical characteristics (terminals 1 and 3 short circuited)
Junction to case 1.55 °C/W
th(j-c)
Symbol Parameter Test conditions Min. Typ. Max. Unit
T
Reverse leakage
(1)
I
R
current
(2)
V
1. Pulse test: tp = 5 ms, δ < 2%
2. Pulse test: tp = 380 µs, δ < 2%
Forward voltage drop
F
= 25 °C
j
= 125 °C - 15 40 mA
T
j
= 125 °C IF = 5 A - 0.49 0.54
T
j
T
= 25 °C IF = 10 A - 0.75
j
= 125 °C - 0.57 0.62
T
j
= 25 °C
T
j
= 125 °C - 0.65 0.72
T
j
V
=V
R
I
= 20 A
F
RRM
- 40 210 µA
-0.89
°C
V
To evaluate the conduction losses use the following equation:
P = 0.56 x I
+ 0.008 x I
F(AV)
F(RMS)
2
2/8 Doc ID 022921 Rev 1
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STPS20SM120S Characteristics
Figure 2. Average forward power dissipation
versus average forward current
P (W)
F(AV)
24
20
δ = 0.05
δ = 0.2
δ = 0.1
δ = 0.5
δ = 1
16
12
8
δ = t /T
T
I (A)
t
p
p
F(AV)
4
0
0 4 8 1216202428
Figure 4. Normalized avalanche power
derating versus pulse duration
P(tp)
ARM
P (10 µs)
ARM
1
0.1
0.01
t (µs)
0.001
p
1 10 100 1000
Figure 6. Reverse leakage current versus
reverse voltage applied
(typical values)
I(mA)
R
1.E+02
=150
Tj°C
1.E+01
1.E+00
1.E-01
1.E-02
1.E-03
0 102030405060708090100110120
Tj=150°C
Tj=100°C
Tj=75°C
Tj=50°C
Tj=25°C
V (V)
R
Figure 3. Average forward current versus
ambient temperature (δ = 0.5)
I(A)
F(AV)
24
R
= R
th(j-a)
th(j-c)
20
16
12
8
4
T
δ = t /T
t
p
0
p
0 25 50 75 100 125 150
T (°C)
amb
Figure 5. Relative variation of thermal
impedance junction to case versus
pulse duration
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
t (s)
p
1.E-04 1.E-03 1.E-02 1.E-01 1.E+00
Figure 7. Junction capacitance versus
reverse voltage applied
(typical values)
C(pF)
1000
100
1 10 100 1000
F=1MHz
=30mV
V
osc
RMS
Tj=25°C
V (V)
R
Doc ID 022921 Rev 1 3/8