STMicroelectronics STPS20M60ST

Overview

STPS20M60ST from STMicroelectronics is a single silicon Schottky power rectifier in TO-220AB package, designed for high-frequency switch-mode power supplies. It delivers 20 A average forward current at 135 °C case temperature, with 60 V repetitive peak reverse voltage and typical forward voltage drop of 0.365 V at 125 °C and 20 A - enabling high-efficiency operation in notebook, desktop, and game station AC/DC adapters.

For engineers reviewing the STPS20M60ST datasheet, STPS20M60ST pinout, STPS20M60ST application, or STPS20M60ST equivalent, key selection criteria include avalanche energy rating (26400 W), junction-to-case thermal resistance (1.0 °C/W), low VF conduction loss profile, and TO-220AB mechanical compatibility with standard heatsink mounting.

Technical Context

This Schottky diode operates without minority-carrier storage delay, supporting MHz-range switching in SMPS secondary-side rectification. Its low forward voltage minimizes conduction losses, while its 80 V maximum repetitive avalanche voltage (VARM) and 600 A non-repetitive surge rating enable robust transient handling in unregulated or dynamically loaded supplies.

The device is rated for 150 °C maximum junction temperature and features a reverse leakage current of ≤75 mA at 125 °C and VRRM, with junction capacitance below 1000 pF at 30 mV RMS and 1 MHz - critical for EMI control and fast recovery behavior in high-density adapter designs.

Key Specifications

Pinout & Package

TO-220AB package with isolated tab (pin 3), three-terminal configuration: Pin 1 (Anode), Pin 2 (Cathode), Pin 3 (Tab/Case - electrically connected to cathode). Mounting torque: 0.4–0.6 N·m. UL94 V0 epoxy housing; conduction-cooled via tab.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20CPH06 and MUR2060CT, STPS20M60ST offers the lowest VF and zero Qrr - delivering superior thermal performance and EMI behavior in modern high-frequency adapters, while its TO-220AB footprint ensures drop-in replacement in existing layouts.

Availability

STPS20M60ST is available at Aetrix Electronics and suitable for notebook adapters, desktop PC power supplies, game station AC adapters, and industrial embedded power modules requiring stable component supply and long-term manufacturability.

Supply support for STPS20M60ST 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The STPS20M60ST belongs to ST's high-current Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability secondary-side rectification in compact, thermally constrained AC/DC adapters and open-frame power supplies.

FAQ

Is STPS20M60ST suitable for synchronous rectification circuits?

No - STPS20M60ST is a passive Schottky diode, not a MOSFET-based synchronous rectifier controller or integrated FET. It functions as a unidirectional, self-commutated rectifier. For synchronous rectification, discrete MOSFETs or dedicated SR controllers (e.g., STSR3) must be used with gate drive timing logic.

What is the maximum recommended PCB copper area for thermal performance in TO-220AB mounting?

Per Figure 11 in the datasheet, a 100 cm² copper surface (35 µm thick) reduces Rth(j-a) to ~15 °C/W. However, STPS20M60ST is intended for conduction cooling via the tab: optimal thermal design uses a heatsink with ≥10 cm² contact area and thermal interface material - PCB copper alone is insufficient for full 20 A operation.

Does STPS20M60ST have a built-in thermal shutdown feature?

No - it is a passive discrete diode with no internal sensing or protection circuitry. Thermal safety relies entirely on external design: heatsink sizing, airflow, and system-level temperature monitoring. Junction temperature must be kept ≤150 °C using Rth(j-c) = 1.0 °C/W and measured case temperature.

Can STPS20M60ST replace STPS20M60SR in the same PCB footprint?

No - STPS20M60ST uses TO-220AB (3-pin, straight leads), while STPS20M60SR uses I2PAK (3-pin, gull-wing leads). Their land patterns, hole spacing, and soldering methods differ. Mechanical interchange requires board redesign; electrical specs are identical, but package thermal and mounting characteristics are not compatible.