Skip to main content
Log in
STMicroelectronics STPS30SM120SR — Discrete Semiconductors

STPS30SM120SR Schottky Rectifier, 30 A, 120 V, Obsolete

MPNSTPS30SM120SR
Obsolete

STMicroelectronics STPS30SM120SR, Schottky rectifier, 30 A average rectified current, 120 V DC reverse voltage, fast recovery ≤500 ns, TO-262-3 (I2PAK) through-hole package, 150°C max junction temperature.

$1.9700Ref. price · indicative, final on quote
STMicroelectronics STPS30SM120SR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STPS30SM120SR specifications
ParameterValue
MountingThrough Hole
Voltage - DC reverse (Vr)120 V
Voltage - forward (Vf) (Max) @ if950 mV @ 30 A
Current - reverse leakage @ vr275 µA @ 120 V
Current - average rectified30A
Operating temperature - junction150°C (Max)
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTube
TechnologySchottky
CaseTO-262-3 Long Leads, I²Pak, TO-262AA

Product details

The STMicroelectronics STPS30SM120SR is a 30 A, 120 V Schottky rectifier in a through-hole TO-262 (I2PAK) package. The Schottky technology delivers fast switching with a forward voltage drop of 950 mV at the full 30 A rated current, keeping conduction losses manageable for the current class.

Any new design-in should target an alternative — either a pin-compatible Schottky in the same package or a functionally equivalent device with similar 30 A, 120 V ratings and a through-hole I2PAK footprint.

Key ratings and the decisions they drive

The 30 A average rectified current and 120 V reverse voltage set the operating envelope for this diode. The 950 mV forward drop at 30 A is the figure to use for worst-case conduction loss calculations — at lower currents the drop will be lower, but the thermal design must handle the full 28.5 W dissipation at rated current if the heatsink is sized for continuous operation. The 275 µA reverse leakage at 120 V is a consideration for standby power budgets, especially at elevated junction temperatures where leakage increases exponentially.

Frequently asked questions

What is the replacement for the STPS30SM120SR?

The evidence does not list an official STMicroelectronics replacement part number. For a form-fit-function substitute, look for a 30 A, 120 V Schottky rectifier in a through-hole TO-262 (I2PAK) package with similar forward voltage and leakage characteristics. A cross-reference search against the base product number STPS30 may yield a current-production sibling.

Can I use the STPS30SM120SR in a 12 V power supply?

Yes. The 120 V reverse voltage rating provides ample margin for a 12 V rail, and the 30 A current rating covers most 12 V output stages. The 950 mV forward drop at 30 A is acceptable for a 12 V output, but the conduction loss should be factored into the thermal design.