Series:	--
Part Status:	Obsolete
Diode Configuration:	1 Pair Common Cathode
Diode Type:	Schottky
Voltage - DC Reverse (Vr) (Max):	120V
Current - Average Rectified (Io) (per Diode):	20A
Voltage - Forward (Vf) (Max) @ If:	1V @ 40A
Speed:	Fast Recovery = 200mA (Io)
Current - Reverse Leakage @ Vr:	25µA @ 120V
Operating Temperature - Junction:	175°C (Max)
Mounting Type:	Through Hole
Package / Case:	TO-220-3
Supplier Device Package:	TO-220AB Narrow Leads

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Diodes - Rectifiers - Arrays

STPS40120CTN Application Field and Working Principle

The STPS40120CTN, which belong to STMicroelectronics’ STPS series of surface-mount Schottky rectifier diodes, are 20V, 40A low-profile quantum-engine devices with switching speed 4 us. This high-power silicon diodes consume a low reverse recovery current and offer low forward voltage while providing a rugged plastic package which is suitable for use in various industrial and automotive applications, enabling designers to reduce power losses, size of the product, increase efficiency and reduce cooling costs.

Application Field

The STPS40120CTN can be found in a number of reliable application fields, such as in OLED lighting, DC–DC converters, LED driver stage, boost circuits, power distribution systems, power supplies, rectifiers, inverters and any other application which requires rugged and efficient power delivery solutions. It can also be used in noisy e-motor applications due to its low reverse-recover current and features a number of electrostatic discharge ratings which enables this device to meet up to ±4kV for contact and ±8kV for air as per the ISO 10605 standard.

Working Principle

Diodes, such as the STPS40120CTN, make use of a phenomenon known as the PN Junction in order to function. When a junction is formed by two dissimilar materials such as Silicon and Germanium, current can only flow from one material to the other when connected in a closed circuit. This Junction Diode works by harnessing a single junction, whereby electrons from the anode travel through the junction to the cathode creating a potential current flow. The PN Junction Diode aids in rectifying AC voltage to its DC counterpart by blocking the desired voltage and allowing current flow when the polarity is correct.The STPS40120CTN works by rectifying the current to its DC counterpart with the aid of a metal-oxide-semiconductor (MOS) integrated circuit, while the metal Schottky barrier is used to allow electrons to flow more efficiently to the other side of the diode. This type of diode is favoured due to its low forward voltage, fast switching speed and low reverse-recovery current which is a result of its low power losses.

Additional Considerations

Due to the efficient nature of the STPS40120CTN, special consideration needs to be taken into account due to the high current per unitary area of this diode. A poorly designed PCB layout can lead to increased I²R losses, which in turn can lead to higher operating temperatures and any potential damage due to this. Examples of considerations which can be taken into account to avoid running into these problems include component placement, trace widths and hole sizes, to name a few. Finally, since this diode is a surface-mount component, it is important to check the datasheet of the component before soldering. The component must meet any applicable requirements as stated in the Manufacturer\'s datasheet, such as the minimum soldering temperature, solder time and reflow cycles.

Conclusion

The STPS40120CTN is a best-in-class high voltage and intense power component. Its high speed, low forward voltage and low reverse recovery current make this component an ideal choice for applications which require rugged, reliable and efficient power delivery solutions such as boost circuits, power distribution systems, power supplies, rectifiers and inverters, among many others. When designing PCBs with the STPS40120CTN, attention must be taken to component placement and layout to ensure optimal performance and reliable operation.

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