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STPS40120CT
Power Schottky Rectifier
September 2011 Doc ID 11214 Rev 3 1/9
STPS40120CPower Schottky rectifier
Features High junction temperature capability Avalanche rated Low leakage current Good trade-off between leakage current and
forward voltage drop
DescriptionDual center tap Schottky rectifier suited for high
frequency Switch Mode Power Supply.
Packaged in TO-220AB, TO-220AB narrow leads
and I2 PAK, this device is intended to be used in
notebook and LCD adaptors, desktop SMPS,
providing in these applications a margin between
the remaining voltages applied on the diode and
the voltage capability of the diode.
Table 1. Device summary
Characteristics STPS40120C
2/9 Doc ID 11214 Rev 3
1 Characteristics
When the diodes 1 and 2 are used simultaneously:j (diode 1) = P(diode 1) x R th(j-c) (per diode) + P(diode 2) x Rth(c)
Table 2. Absolute ratings (limiting values, per diode)
Table 3. Thermal parameters
Table 4. Static electrical characteristics (per diode) Pulse test: tp = 5 ms, δ < 2% Pulse test: tp = 380 µs, δ < 2% o evaluate the maximum conduction losses use the following equation:
P = 0.58 x IF(AV) + 0.0075 IF2 (RMS)
dPtot---------------
STPS40120C Characteristics
Doc ID 11214 Rev 3 3/9
Figure 1. Average forward power
dissipation versus average
forward current (per diode)
Figure 2. Average forward current versus
ambient temperature
(δ = 0.5, per diode)
Figure 3. Normalized avalanche power
derating versus pulse duration
Figure 4. Normalized avalanche power
derating versus junction
temperature
Figure 5. Non repetitive surge peak forward
current versus overload duration
(maximum values, per diode)
Figure 6. Relative variation of thermal
impedance junction to ambient
versus pulse duration
Characteristics STPS40120C
4/9 Doc ID 11214 Rev 3
Figure 9. Forward voltage drop versus forward current (per diode)
Figure 7. Reverse leakage current versus
reverse voltage applied (typical
values, per diode)
Figure 8. Junction capacitance versus
reverse voltage applied (typical
values, per diode)
STPS40120C Package information
Doc ID 11214 Rev 3 5/9
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® packages, depending on their level of environmental compliance. ECOP ACK®
specifications, grade definitions and product status are available at: .
ECOPACK® is an ST trademark.
Figure 10. TO-220AB dimensions
Package information STPS40120C
6/9 Doc ID 11214 Rev 3
Table 5. TO-220AB narrow leads dimensions
