STMicroelectronics STPS30SM120STN

Overview

STPS30SM120STN from STMicroelectronics is a 120 V, 30 A average forward current Schottky rectifier in TO-220AB package, featuring 0.47 V typical forward voltage at 125 °C and 5 A, avalanche-rated operation, and 2000 VRMS insulation (TO-220FPAB variant). It serves as a high-efficiency output rectifier in notebook adapters and DC/DC converters where low conduction loss and high-frequency switching are critical.

For engineers reviewing the STPS30SM120STN datasheet, STPS30SM120STN pinout, STPS30SM120STN application, or STPS30SM120STN equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance (Rth(j-c) = 1.35 °C/W), avalanche energy capability (1200 W peak), and insulated package compliance for safety-critical AC/DC secondary-side designs.

Technical Context

This device is a single-die, planar Schottky barrier rectifier optimized for high-frequency switch-mode power supplies. Its low VF and fast recovery eliminate minority-carrier storage delay, enabling efficient operation above 100 kHz without reverse recovery spikes.

The TO-220AB package provides direct metal-to-heatsink thermal path with Rth(j-c) = 1.35 °C/W, while the insulated TO-220FPAB variant adds reinforced isolation (2000 VRMS) for applications requiring creepage/clearance compliance without external insulators.

Key Specifications

Pinout & Package

STPS30SM120STN uses the TO-220AB package: 3-terminal through-hole outline with isolated mounting hole, epoxy meeting UL 94 V0, and recommended torque of 0.55 N·m.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Compared with VS-30CPH06-M3 and MBR30H120CT, STPS30SM120STN offers optimal balance of 120 V rating, lowest VF in its class, and TO-220AB mechanical compatibility-making it preferred for space-constrained, single-output 19 V adapter designs requiring regulatory insulation margins.

Availability

STPS30SM120STN is available at Aetrix Electronics and suitable for notebook adapters, LED lighting drivers, and industrial DC/DC converters requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for STPS30SM120STN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

STPS30SM120STN belongs to ST's high-current Schottky rectifier product line, engineered specifically for high-efficiency, high-power-density AC/DC and DC/DC conversion in portable and computing power supplies.

FAQ

What is the maximum allowable case temperature for continuous operation?

The maximum case temperature is derived from Tj(max) = 150 °C and Rth(j-c) = 1.35 °C/W. With 30 A IF(AV), power dissipation is ~14.1 W (using P = 0.56 × IF(AV) + 0.0067 × IF²(RMS)). This yields a max case temperature of 131 °C at steady state, assuming no additional thermal interface resistance beyond the specified Rth(j-c).

Is STPS30SM120STN suitable for synchronous rectification replacement?

No-it is a passive Schottky rectifier, not a synchronous rectifier IC or MOSFET driver. While it replaces standard diodes in flyback or forward converters, it cannot substitute for active synchronous rectifiers that require gate control signals and timing logic.

Does the TO-220AB package provide electrical isolation between tab and leads?

No-the TO-220AB package has an electrically conductive metal tab connected to the anode. Electrical isolation requires either external insulating hardware or the TO-220FPAB variant, which integrates 2000 VRMS reinforced insulation between tab and leads.

How does avalanche rating impact reliability in SMPS designs?

The 1200 W avalanche rating at 10 µs pulse width ensures survivability during output short-circuit events or transformer leakage inductance spikes. It eliminates need for external clamping circuits in well-designed adapters, directly improving MTBF by preventing single-pulse catastrophic failure.