STMicroelectronics STPS20SM60SR

Overview

STPS20SM60SR from STMicroelectronics is a single silicon Schottky power rectifier in I2PAK package, rated for 20 A average forward current and 60 V repetitive peak reverse voltage, with typical forward voltage drop of 0.410 V at 125 °C and 20 A. It is avalanche-rated (80 V max repetitive peak avalanche voltage), optimized for high-frequency switch-mode power supplies in notebook, desktop, and game station adapters.

For engineers reviewing the STPS20SM60SR datasheet, STPS20SM60SR pinout, STPS20SM60SR application, or STPS20SM60SR equivalent, key selection criteria include low conduction loss (P = 0.430 × IF(AV) + 0.0075 × IF²(RMS)), junction-to-case thermal resistance of 1.3 °C/W, avalanche energy capability, and I2PAK mounting compatibility with standard heatsink torque (0.4–0.6 N·m).

Technical Context

This Schottky diode operates without minority-carrier storage, enabling zero reverse recovery time and minimal switching losses-critical for >100 kHz SMPS topologies. Its low VF and high IF(AV) support high-efficiency rectification at both light and full load in AC-DC adapters.

The device is validated for repetitive avalanche operation up to 18.4 kW (tp = 1 µs, Tj = 25 °C), with defined safe operating area (SOA) in reverse bias (Figure 12). Thermal design relies on direct conduction cooling via the tab (Rth(j-c) = 1.3 °C/W), requiring mechanical mounting per I2PAK footprint and torque spec.

Key Specifications

Pinout & Package

Package: I2PAK (TO-263), surface-mount with isolated tab, epoxy body compliant with UL94 V0, designed for conduction cooling via soldered tab to PCB copper pour or external heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20CPH06 and MBR2060CT, STPS20SM60SR delivers optimal balance of low VF, I2PAK mountability, and avalanche ruggedness for space-constrained, high-efficiency AC-DC adapters-without requiring package redesign or performance trade-offs.

Availability

STPS20SM60SR is available at Aetrix Electronics and suitable for notebook adapters, desktop PC power supplies, and game station power modules requiring stable component supply and long-term industrial availability.

Supply support for STPS20SM60SR 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 STPS series targets high-efficiency power conversion, with STPS20SM60SR specifically engineered for high-current, high-frequency Schottky rectification in compact AC-DC adapters where thermal density and avalanche safety are critical.

FAQ

What is the maximum allowable case temperature for continuous 20 A operation?

The datasheet specifies IF(AV) = 20 A at Tc = 130 °C. Exceeding this case temperature risks exceeding the 150 °C maximum junction temperature, especially under high ambient or poor heatsinking. Derating is required above 130 °C-e.g., 16 A at Tc = 145 °C per Figure 3.

Can STPS20SM60SR replace a standard PN-junction fast recovery diode in an existing 60 V design?

Yes, provided layout accommodates I2PAK footprint and thermal path. Key advantages include zero reverse recovery (eliminating snubber losses), lower VF (reducing conduction loss), and no minority-carrier tail current. However, its lower VRRM margin versus 100 V+ fast diodes requires verification of worst-case reverse voltage transients.

Is the tab electrically isolated from the leads?

No-the tab is internally connected to Pin 2 (cathode) and is not electrically isolated. It must be mounted to a cathode-referenced copper pour or heatsink. Insulating pads or shoulder washers are unnecessary and would degrade thermal performance.

How does the avalanche rating impact reliability in flyback converter designs?

The 80 V VARM rating allows the diode to safely clamp transformer leakage inductance spikes without external TVS devices. Tested per AN1768, it sustains repetitive 1 µs pulses up to 18.4 kW, extending lifetime in unregulated or poorly snubbed flyback topologies where voltage overshoot exceeds VRRM.