STMicroelectronics STPS20SM60CT

Overview

STPS20SM60CT 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-frequency SMPS in notebook and desktop AC/DC adapters.

For engineers reviewing the STPS20SM60CT datasheet, STPS20SM60CT pinout, STPS20SM60CT application, or STPS20SM60CT equivalent, key selection criteria include avalanche energy rating (13600 W), thermal resistance (1.5 °C/W junction-to-case per diode), low conduction loss profile, and dual-diode layout for interleaved or synchronous rectification topologies.

Technical Context

This device implements two independent Schottky junctions sharing a common cathode terminal, enabling parallel or phase-split rectification without cross-conduction risk. Its low VF and absence of minority-carrier storage support operation beyond 1 MHz with minimal switching loss.

Rated for 150 °C maximum junction temperature and avalanche-tested to 80 V / 51 A pulses (tp < 1 µs), it sustains transient overvoltage events in unregulated or loosely regulated DC bus lines without failure - critical for adapter reliability under line surges or load dump conditions.

Key Specifications

Pinout & Package

Packaged in TO-220AB with isolated tab (electrically connected to cathode), this device features three terminals: two anodes (A1, A2) and one shared cathode (K). Mounting hole accepts M3 screw with 0.4–0.6 N·m torque.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSS20200CTG and VS-20CPH06-M3, STPS20SM60CT delivers superior thermal efficiency per unit area, integrated dual-path architecture for layout simplicity, and validated avalanche robustness - making it optimal for compact, high-reliability AC/DC adapters where conduction loss and surge immunity are co-critical.

Availability

STPS20SM60CT is available at Aetrix Electronics and suitable for notebook AC/DC adapters, desktop PC power supplies, and game console power bricks requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for STPS20SM60CT 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 STPS20SM60CT belongs to ST's high-efficiency Schottky rectifier product line, engineered specifically for high-frequency switch-mode power conversion in space-constrained, thermally demanding AC/DC adapters and open-frame PSUs.

FAQ

What is the maximum continuous power dissipation per diode at Tc = 140 °C?

At case temperature Tc = 140 °C, the maximum average forward current per diode is 10 A (δ = 0.5). Using the conduction loss equation P = 0.375 × IF(AV) + 0.0135 × IF²(RMS), and assuming IF(RMS) ≈ 14.1 A for δ = 0.5, dissipation is approximately 3.75 W + 2.68 W = 6.43 W per diode - well within the 15 W limit defined by Rth(j-c) = 1.5 °C/W and ΔTj = 10 °C margin.

Can STPS20SM60CT be used in place of a single 20 A Schottky diode?

No - STPS20SM60CT contains two independent 10 A diodes sharing a cathode, not a single 20 A device. It cannot replace a monolithic 20 A Schottky in configurations requiring one anode-to-cathode path. However, it can substitute two discrete 10 A diodes in dual-output or interleaved topologies, offering better thermal coupling and reduced footprint.

Is the TO-220AB tab electrically isolated from the leads?

Yes - the TO-220AB package uses an isolated tab design where the metal tab is electrically connected only to the common cathode (K) terminal and is insulated from the lead frame. This allows direct heatsink mounting without electrical isolation hardware, provided the heatsink is referenced to the cathode potential.

Does ST provide SPICE models for STPS20SM60CT?

ST does not publish a dedicated SPICE model for STPS20SM60CT. However, its electrical behavior can be approximated using ST's generic Schottky diode macro-model (e.g., STPS1230TY or STPS20L60CG equivalents) with adjusted VF, IR, and junction capacitance parameters extracted from Figures 10 and 9 in the datasheet.