May 2008 Rev 1 1/7
STPS120MF
Power Schottky rectifier in flat package
Features
■Very low profile package: 0.85 mm
■Backward compatible with standard STmite
footprint
■Very small conduction losses
■Negligible switching losses
■Extremely fast switching
■Low forward voltage drop for higher efficiency
and extended battery life
■Low thermal resistance
■Avalanche capability specified
■Hologen free molding compound
Description
Single Schottky rectifier suited for switch mode
power supplies and high frequency dc to dc
converters.
Packaged in STmite flat, this device is intended
for use in low voltage, high frequency inverters,
free wheeling and polarity protection applications.
Due to the very small size of the package this
device fits battery powered equipment (cellular,
notebook, PDA’s, printers) as well as chargers
and PCMCIA cards.
Table 1. Device summary
IF(AV) 1 A
VRRM 20 V
Tj (max) 150 °C
VF (max) 0.41 V
K
A
STmite flat
(DO222-AA)
www.st.com
Characteristics STPS120MF
2/7
1 Characteristics
Table 2. Absolute ratings (limiting values)
Symbol Parameter Value Unit
VRRM Repetitive peak reverse voltage 20 V
IF(RMS) Forward current rms 2 A
IF(AV) Average forward current Tc = 140 °C δ = 0.5 1 A
IFSM Surge non repetitive forward current tp = 10 ms sinusoidal 50 A
PARM Repetitive peak avalanche power tp = 1 µs Tj = 25 °C 1400 W
Tstg Storage temperature range -65 to + 150 °C
TjMaximum operating junction temperature(1)
1. condition to avoid thermal runaway for a diode on its own heatsink
150 °C
dV/dt Critical rate of rise of reverse voltage (rated VR, Tj = 25 °C) 10000 V/µs
Table 3. Thermal resistance
Symbol Parameter Value Unit
Rth(j-c) Junction to case 20 °C/W
Rth(j-a)(1)
1. Mounted with minimum recommended pad size, PC board FR4
Junction to ambient 250 °C/W
Table 4. Static electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
IR(1)
1. Pulse test: tp = 380 µs, δ < 2%
To evaluate the conduction losses use the following equation:
P = 0.34 x IF(AV) + 0.07 IF2(RMS)
Reverse leakage current
Tj = 25° C VR = VRRM
1.3 3.9
µA
Tj = 100° C 275 850
Tj = 25° C VR = 10 V 0.6 2.0
Tj = 100° C 145 450
Tj = 25° C VR = 5 V 0.4 10.
Tj = 100° C 105 300
VF(1) Forward voltage drop
Tj = 25° C IF = 1 A 0.44 0.49
V
Tj = 100° C 0.36 0.41
Tj = 25° C IF = 2 A 0.48 0.54
Tj = 100° C 0.42 0.48
dPtot
dTj
--------------- 1
Rth j a–()
--------------------------
<
STPS120MF Characteristics
3/7
Figure 1. Conduction losses versus average
current
Figure 2. Average forward current versus
ambient temperature (δ = 0.5)
P (W)
F(AV)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
δ=0.05
δ=0.1 δ=0.2 δ=0.5 δ=1
T
δ
=tp/T tp
I (A)
F(AV)
I (A)
F(AV)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
0 25 50 75 100 125 150
R
th(j-a)
=R
th(j-c)
R
th(j-a)
=250°C/W
T (°C)
amb
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
t (µs)
p
P(t
p)
P (1 µs)
ARM
ARM
0
0.2
0.4
0.6
0.8
1
1.2
25 50 75 100 125 150
T (°C)
j
P(T
j)
P (25 °C)
ARM
ARM
Figure 5. Non repetitive surge peak forward
current versus overload duration
(maximum values)
Figure 6. Relative variation of thermal
impedance junction to ambient
versus pulse duration
I (A)
M
0
1
2
3
4
5
6
1.E-03 1.E-02 1.E-01 1.E+00
T
a
=25°C
T
a
=75°C
T
a
=125°C
I
M
t
δ=0.5
t(s)
Z/R
th(j-a) th(j-a)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03
Single pulse
t (s)
p
Characteristics STPS120MF
4/7
Figure 11. Thermal resistance junction to ambient versus copper surface under tab
(epoxy printed board FR4, Cu = 35 µm, typical values)
Figure 7. Reverse leakage current versus
reverse voltage applied (typical
values)
Figure 8. Junction capacitance versus
reverse voltage applied (typical
values)
I (mA)
R
1.E-04
1.E-03
1.E-02
1.E-01
1.E+00
1.E+01
0 2 4 6 8 101214161820
Tj=150°C
Tj=125°C
Tj=25°C
Tj=100°C
Tj=75°C
Tj=50°C
V (V)
R
C(pF)
10
100
1000
0 2 4 6 8 10 12 14 16 18 20
F=1MHz
V
osc
=30mV
T
j
=25°C
V (V)
R
Figure 9. Forward voltage drop versus
forward current (low level)
Figure 10. Forward voltage drop versus
forward current (high level)
I (A)
FM
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6
Tj=25°C
(Maximum values)
Tj=100°C
(Maximum values)
Tj=100°C
(Maximum values)
Tj=100°C
(Typical values)
Tj=100°C
(Typical values)
V (V)
FM
I (A)
FM
0.1
1.0
10.0
100.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
Tj=25°C
(Maximum values)
Tj=100°C
(Maximum values)
Tj=100°C
(Maximum values)
Tj=100°C
(Typical values)
Tj=100°C
(Typical values)
V (V)
FM
R (°C/W)
th(j-a)
0
25
50
75
100
125
150
175
200
225
250
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
S(cm²)
STPS120MF Package information
5/7
2 Package information
●Epoxy meets UL94, V0
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a lead-free second level interconnect. The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at www.st.com.
Figure 12. STmite flat recommended footprint (all dimensions in mm)
Table 5. STmite flat dimensions
Ref.
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 0.80 0.85 0.95 0.031 0.033 0.037
b 0.40 0.55 0.65 0.016 0.022 0.026
b2 0.70 0.85 1.00 0.027 0.033 0.039
c 0.10 0.15 0.25 0.004 0.006 0.009
D 1.75 1.90 2.05 0.069 0.075 0.081
E 3.60 3.80 3.90 0.142 0.150 0.154
E1 2.80 2.95 3.10 0.110 0.116 0.122
L 0.50 0.55 0.80 0.020 0.022 0.031
L1 2.10 2.40 2.60 0.083 0.094 0.102
L2 0.45 0.60 0.75 0.018 0.024 0.030
L3 0.20 0.35 0.50 0.008 0.014 0.020
E1
E
c
Db
L3
A
LL1 L2
b2
0.85 0.63 2.00
4.13
0.95 1.95
0.65
0.65
Ordering information STPS120MF
6/7
3 Ordering information
4 Revision history
Table 6. Ordering information
Order code Marking Package Weight Base qty Delivery mode
STPS120MF F12 STmite flat 16 mg 12000 Tape and reel
Table 7. Document revision history
Date Revision Changes
15-May-2008 1First issue.
STPS120MF
7/7
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