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STMicroelectronics STPS20SM120STN — Discrete Semiconductors

STPS20SM120STN Schottky Rectifier, 120V 20A, TO-220AB

MPNSTPS20SM120STN
Obsolete

STMicroelectronics STPS20SM120STN, Schottky rectifier, 120 V DC reverse voltage, 20 A average rectified current, fast recovery ≤500 ns, TO-220AB narrow leads, through-hole, ECOPACK2, tube.

$1.6000Ref. price · indicative, final on quote
STMicroelectronics STPS20SM120STN datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STPS20SM120STN specifications
ParameterValue
SeriesECOPACK®2
MountingThrough Hole
Voltage - DC reverse (Vr)120 V
Voltage - forward (Vf) (Max) @ if890 mV @ 20 A
Current - reverse leakage @ vr210 µA @ 120 V
Current - average rectified20A
Operating temperature - junction150°C (Max)
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTube
TechnologySchottky
CaseTO-220-3

Product details

The STPS20SM120STN is a 120 V, 20 A Schottky rectifier from STMicroelectronics in a through-hole TO-220AB narrow-leads package. It belongs to the ECOPACK2 series, meaning the device itself is halogen-free and meets ST's green-packaging directive. The fast recovery characteristic (≤500 ns at >200 mA) makes it suitable for high-frequency rectification, freewheeling diodes in switched-mode power supplies, and output rectification in DC-DC converters where reverse-recovery losses matter.

Obsolete — last-time-buy window is closed

STMicroelectronics lists the STPS20SM120STN as Obsolete. The official last-time-buy window has passed; no further production is planned. Procurement for new builds must rely on the surplus and broker channel, where date-code and provenance verification becomes critical.

Forward drop and leakage — the trade-off

Maximum forward voltage is 890 mV at 20 A, which is typical for a 120 V Schottky at this current level — the trade-off for the higher reverse voltage rating. Reverse leakage is 210 µA at 120 V, a figure that doubles with junction temperature; at the 150°C maximum junction temperature, expect leakage to dominate standby losses in a high-temperature environment like a sealed power supply.

The device is rated for a junction temperature up to 150°C, so derating the current above 100°C case temperature is necessary to stay within the SOA.

Frequently asked questions

Is STPS20SM120STN obsolete?

Yes, STMicroelectronics lists the STPS20SM120STN as Obsolete. No further production is planned; the last-time-buy window has closed. Sourcing is limited to the surplus and independent distribution channel.

What is the replacement for STPS20SM120STN?

STMicroelectronics has not published an official direct replacement for the STPS20SM120STN. A functionally similar Schottky in the same voltage and current class (120 V, 20 A, TO-220) from ST or another manufacturer would need to be evaluated for forward drop, leakage, and package fit. The STPS20M120STN (non-narrow-lead version) is a common starting point, but verify the lead width matches your heatsink or PCB hole pattern.

What are the specifications of STPS20SM120STN?

The STPS20SM120STN is a Schottky rectifier rated for 120 V DC reverse voltage and 20 A average rectified current. It features fast recovery (≤500 ns at >200 mA), a maximum forward voltage of 890 mV at 20 A, and reverse leakage of 210 µA at 120 V. It comes in a through-hole TO-220AB narrow-leads package with an ECOPACK2 green finish, and operates up to a 150°C junction temperature.