ST STPS2L40 User Manual
STPS2L40
Low drop power Schottky rectifier
Features
■ Very small conduction losses
■ Negligible switching losses
■ Low forward voltage drop
■ Surface mount miniature package
■ Avalanche capability specified
■ ECOPACK2
(SMAflat and SMBflat)
Description
Single chip Schottky rectifiers suited to Switched
Mode Power Supplies and high frequency DC to
DC converters.
Packaged in SMB, low profile SMB and low profile
SMA, this device is especially intended for surface
mounting and used in low voltage, high frequency
inverters, free wheeling and polarity protection
applications.
®
halogen-free component
A
K
SMB
STPS2L40U
A
K
SMAflat
STPS2L40AF
Table 1. Device summary
I
F(AV)
V
RRM
(max) 150 °C
T
j
(max) 0.34 V
V
F
A
K
SMBflat
STPS2L40UF
2 A
40 V
September 2008 Rev 4 1/10
www.st.com
10
Characteristics STPS2L40
d
-
1 Characteristics
Table 2. Absolute ratings (limiting values)
Symbol Parameter Value Unit
V
RRM
I
F(AV)
I
FSM
P
ARM
T
stg
T
Ptot
--------------
1. condition to avoid thermal runaway for a diode on its own heatsink
dTj
Table 3. Thermal resistances
Repetitive peak reverse voltage 40 V
SMB T
Average forward current
SMAflat T
= 130 °C δ = 0.5
L
= 140 °C δ = 0.5
L
= 130 °C δ = 0.5
L
Surge non repetitive forward current tp = 10 ms sinusoidal 75 A
Repetitive peak avalanche power tp = 1 µs Tj = 25 °C 2200 W
Storage temperature range -65 to + 150 °C
Operating junction temperature
j
1
------------------- -------
<
Rth j a–()
(1)
150 °C
2ASMBflat T
Symbol Parameter Value Unit
SMB 20
R
Junction to lead
th (j-l)
°C/W SMBflat 10
SMAflat 20
Table 4. Static electrical characteristics
Symbol Tests conditions Min. Typ. Max. Unit
(1)
I
Reverse leakage current
R
(1)
V
Forward voltage drop
F
1. Pulse test: tp = 380 µs, δ < 2
= 25 °C
T
j
T
= 100 °C 20 mA
j
T
= 125 °C 38 80 mA
j
V
R
= 40 V
Tj = 25 °C
I
= 1 A
T
= 125 °C 0.25 0.28
j
T
= 25 °C
j
= 125 °C 0.31 0.34
T
j
T
= 25 °C
j
= 125 °C 0.39 0.45
T
j
F
I
= 2 A
F
I
= 4 A
F
220 µA
0.39
V
0.43
0.5
V
To evaluate the conduction losses use the following equation:
P = 0.22 x I
2/10
F(AV)
+ 0.06 I
F2(RMS)
STPS2L40 Characteristics
Figure 1. Average forward power dissipation
versus average forward current
P (W)
F(AV)
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8
δ = 0.05
δ = 0.1
δ = 0.2
I (A)
F(AV)
δ = 0.5
δ
=tp/T
δ = 1
T
tp
Figure 3. Average forward current versus
ambient temperature (
δ = 0.5)
SMBflat
I(A)
F(AV)
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 25 50 75 100 125 150
δ
=tp/T
T
tp
R =100°C/W
th(j-a)
T (°C)
R=R
th(j-a) th(j-l)
amb
SMBflat
Figure 5. Non repetitive surge peak forward
current versus overload duration
(maximum values) SMB
I (A)
M
12
11
10
9
8
7
6
5
4
3
I
M
2
1
0
1.E-03 1.E-02 1.E-01 1.E+00
t
δ
=0.5
t(s)
SMB
T =25°C
a
T =75°C
a
T =125°C
a
Figure 2. Average forward current versus
ambient temperature (
I (A)
F(AV)
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 25 50 75 100 125 150
δ
=tp/T
T
tp
R =100°C/W
th(j-a)
T (°C)
R=R
th(j-a) th(j-l)
amb
δ = 0.5) SMB
SMB
Figure 4. Average forward current versus
ambient temperature (δ = 0.5)
SMAflat
I (A)
F(AV)
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
=tp/T
δ
0.0
0 25 50 75 100 125 150
R
=200 °C/W
th(j-a)
T
tp
T (°C)
amb
R
th(j-a)=Rth(j-l)
SMAflat
Figure 6. Non repetitive surge peak forward
current versus overload duration
(maximum values) SMBflat
I (A)
M
30
25
20
15
10
I
M
5
0
1.E-03 1.E-02 1.E-01 1.E+00
t
δ
=0.5
t(s)
SMBflat
T =25°C
L
T =75°C
L
T =125°C
L
3/10
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