STMicroelectronics STPS20SM60CFP

Overview

STPS20SM60CFP from STMicroelectronics is a dual common-cathode Schottky rectifier in TO-220AB package, rated for 2 × 10 A average forward current per diode, 60 V repetitive peak reverse voltage, and 0.370 V typical forward voltage at 125 °C - optimized for high-efficiency AC/DC adapters in notebooks and desktop PCs.

For engineers reviewing the STPS20SM60CFP datasheet, STPS20SM60CFP pinout, STPS20SM60CFP application, or STPS20SM60CFP equivalent, key selection criteria include avalanche energy rating (13600 W), thermal resistance (1.5 °C/W junction-to-case per diode), and low-conduction-loss profile across load range.

Technical Context

This dual Schottky rectifier integrates two independent anodes sharing a common cathode terminal, enabling synchronous or interleaved operation in dual-output or center-tapped SMPS topologies. Its 150 °C maximum junction temperature and avalanche-rated design support robust transient handling without external snubbers.

The device leverages platinum-silicide Schottky barrier technology to achieve sub-0.5 V forward drop at 10 A and 125 °C, minimizing conduction loss while maintaining fast recovery (no stored charge). Thermal coupling between diodes is modeled via R_th(c) = 0.2 °C/W, critical for accurate parallel thermal derating.

Key Specifications

Pinout & Package

TO-220AB package with isolated metal tab (cathode-connected), standard 3-pin through-hole mounting, UL94 V0 epoxy, and recommended torque of 0.4–0.6 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20CPH06 and MBR2060CT, STPS20SM60CFP delivers superior thermal efficiency and intrinsic surge resilience - critical for unclamped flyback and QR converters where layout-induced ringing exceeds 80 V.

Availability

STPS20SM60CFP is available at Aetrix Electronics and suitable for notebook adapters, desktop PC PSUs, game console power supplies, and USB-C PD chargers requiring stable component supply and long-term industrial availability.

Supply support for STPS20SM60CFP 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The STPS20SM60CFP belongs to ST's high-current Schottky rectifier product line, engineered specifically for high-frequency switch-mode power supplies where low VF, thermal robustness, and avalanche survivability define system-level reliability.

FAQ

What is the thermal resistance from junction to case per diode?

The STPS20SM60CFP has a junction-to-case thermal resistance of 1.5 °C/W per diode, measured with the device mounted to a large copper heatsink using recommended torque (0.4–0.6 N·m). This value assumes direct metal-to-metal contact and excludes interface thermal resistance from paste or pad.

Is the common cathode internally connected to the metal tab?

Yes - the K (cathode) terminal is electrically and thermally bonded to the exposed metal tab in the TO-220AB package. The tab must be insulated from chassis ground unless the circuit reference is tied to cathode potential, and must be mounted with appropriate dielectric isolation if floating.

Can both diodes operate simultaneously at full rated current?

Yes, but thermal derating applies: simultaneous 10 A per diode yields 20 A total device current, generating ~7.4 W total conduction loss. With R_th(j–c) = 1.5 °C/W per diode and R_th(c) = 0.2 °C/W coupling, junction temperature rises ~11.5 °C above case - requiring case temperature ≤ 138.5 °C to stay within 150 °C limit.

What is the maximum repetitive avalanche voltage rating?

The maximum repetitive peak avalanche voltage (V_ARM) is 80 V at T_j < 150 °C and I_AR < 51 A for pulses shorter than 1 µs. This rating is validated per ST application notes AN1768 and AN2025 and defines the safe reverse-bias overvoltage boundary during transformer leakage spike events.