STPS140A/U
July 1998 - Ed: 6B
POWER SCHOTTKY RECTIFIER
I
F(AV)
1 A
V
RRM
40 V
V
F
(max)
0.5 V
MAIN PRODUCT CHARACTERISTICS
VERY SMALL CONDUCTION LOSSES
NEGLIGIBLE SWITCHING LOSSES
LOW FORWARD VOLTAGE DROP
SURFACE MOUNTED DEVICE
FEATURES AND BENEFITS
Single chip Schottky rectifier suited for Switch-
mode Power Supplies and high frequency DC to
DC converters.
Packaged in SMA and SMB(*), this device is in-
tended for surface mounting and used in low volt-
age, high frequency inverters, free wheeling and
polarity protection applications.
(*) in accordance with DO214AAand DO21AC JEDEC
DESCRIPTION
SMB
STPS140U
Symbol
Parameter
Value
Unit
V
RRM
Repetitive peak reverse voltage
40
V
I
F(RMS)
RMS forward current
7
A
I
F(AV)
Average forward current
= 0.5
SMA
T
L
= 130C
1
A
SMB
T
L
= 135C
I
FSM
Surge non repetitive forward current
tp = 10 ms
Sinusoidal
60
A
I
RRM
Repetitive peak reverse current
tp = 2
s
F = 1kHz
1
A
I
RSM
Non repetitive peak reverse current
tp = 100
s square
1
A
T
stg
Storage temperature range
- 65 to + 150
C
Tj
Maximum junction temperature
150
dV/dt
Critical rate of rise of reverse voltage
10000
V/
s
ABSOLUTE RATINGS (limiting values)
SMA
STPS140A
1/6
Symbol
Parameter
Value
Unit
R
th (j-l)
Junction to lead
SMA
30
C/W
SMB
25
THERMAL RESISTANCES
Symbol
Tests Conditions
Tests Conditions
Min.
Typ.
Max.
Unit
I
R
*
Reverse leakage current
Tj = 25
C
V
R
= 40V
12
A
Tj = 100C
0.25
2
mA
V
F
**
Forward voltage drop
Tj = 25
C
I
F
= 1 A
0.55
V
Tj = 125
C
I
F
= 1 A
0.43
0.5
Tj = 25
C
I
F
= 2 A
0.65
Tj = 125
C
I
F
= 2 A
0.53
0.6
STATIC ELECTRICAL CHARACTERISTICS
Pulse test :
* tp = 5 ms,
< 2 %
** tp = 380
s,
< 2%
To evaluate the maximum conduction losses use the following equation :
P = 0.4 x I
F(AV)
+ 0.10 x I
F
2
(RMS)
0.0
0.2
0.4
0.6
0.8
1.0
1.2
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
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.
0
25
50
75
100
125
150
0.0
0.2
0.4
0.6
0.8
1.0
1.2
Tamb(C)
IF(av)(A)
Rth(j-a)=Rth(j-l)
SMA
Rth(j-a)=100C/W
S(Cu)=1.5cm
SMB
Rth(j-a)=80C/W
S(Cu)=1.5cm
T
=tp/T
tp
Fig. 2: Average forward current versus ambient
temperature (
=0.5).
STPS140A/U
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1E-3
1E-2
1E-1
1E+0
0
1
2
3
4
5
6
7
8
t(s)
IM(A)
Ta=25C
Ta=50C
Ta=100C
I
M
t
=0.5
Fig. 3-1: Non repetivesurge peak forward current
versus overload duration (maximum values) (SMB).
1E-3
1E-2
1E-1
1E+0
0
1
2
3
4
5
6
7
8
Ta=25C
Ta=50C
Ta=100C
t(s)
IM(A)
I
M
t
=0.5
Fig. 3-2: Non repetivesurge peak forward current
versus overload duration (maximum values) (SMA).
1E-2
1E-1
1E+0
1E+1
1E+2
1E+3
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
tp(s)
Zth(j-a)/Rth(j-a)
Single pulse
Printed circuit board: SCu=1.5cm (e=35m)
2
= 0.1
= 0.2
= 0.5
T
=tp/T
tp
Fig. 4-1: Relative variation of thermal impedance
junction to ambient versus pulse duration (SMB).
1E-2
1E-1
1E+0
1E+1
1E+2
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Zth(j-a)/Rth(j-a)
Single pulse
= 0.1
= 0.2
= 0.5
T
=tp/T
tp
tp(s)
Printed circuit board: SCu=1.5cm (e=35m)
2
Fig. 4-2: Relative variation of thermal impedance
junction to ambient versus pulse duration (SMA).
0
5
10
15
20
25
30
35
40
1E-2
1E-1
1E+0
1E+1
1E+2
1E+3
VR(V)
IR(A)
Tj=125C
Tj=75C
Tj=25C
Fig. 5: Reverse leakage current versus reverse
voltage applied (typical values).
1
2
5
10
20
50
10
20
50
100
200
C(pF)
F=1MHz
Tj=25C
VR(V)
Fig. 6: Junction capacitance versus reverse
voltage applied (typical values)
STPS140A/U
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0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
1E-2
1E-1
1E+0
1E+1
VFM(V)
IFM(A)
Tj=125C
Fig. 7: Forward voltage drop versus forward
current (maximum values).
0
1
2
3
4
5
0
20
40
60
80
100
120
S(Cu) (cm)
Rth(j-a) (C/W)
P=1.5W
Fig. 8-1: Thermal resistance junction to ambient
versus copper surface under each lead (Epoxy
printed circuit board, copper thickness: 35
m)(SMB).
0
1
2
3
4
5
0
20
40
60
80
100
120
140
P=1.5W
S(Cu) (cm)
Rth(j-a) (C/W)
Fig. 8-2: Thermal resistance junction to ambient
versus copper surface under each lead (Epoxy
printed circuit board, copper thickness: 35
m)(SMA).
STPS140A/U
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PACKAGE MECHANICAL DATA
SMA
E
C
L
E1
D
A1
A2
b
REF.
DIMENSIONS
Millimeters
Inches
Min.
Max.
Min.
Max.
A1
1.90
2.70
0.075
0.106
A2
0.05
0.20
0.002
0.008
b
1.25
1.65
0.049
0.065
c
0.15
0.41
0.006
0.016
E
4.80
5.60
0.189
0.220
E1
3.95
4.60
0.156
0.181
D
2.25
2.95
0.089
0.116
L
0.75
1.60
0.030
0.063
Marking: S140
FOOT PRINT (in millimeters)
2.40
1.65
1.45
1.45
STPS140A/U
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