STMicroelectronics STPS20M100ST

Overview

STPS20M100ST from STMicroelectronics is a 100 V, 20 A single Schottky rectifier in TO-220AB package, designed for high-frequency switch-mode power supplies. It delivers low forward voltage drop (0.61 V typ. at 20 A, 25 °C), avalanche-rated operation, and 150 °C maximum junction temperature - enabling high-efficiency DC/DC conversion in notebook adapters and game station power supplies.

For engineers reviewing the STPS20M100ST datasheet, STPS20M100ST pinout, STPS20M100ST application, or STPS20M100ST equivalent, key selection criteria include conduction loss optimization via VF vs. IF curves, thermal management using Rth(j-c) = 1.2 °C/W, avalanche energy handling (1150 W peak), and insulation requirements for TO-220FPAB variants.

Technical Context

This Schottky rectifier operates as a unidirectional power switching diode with zero recovery charge and no minority-carrier storage delay. Its low VF enables reduced conduction losses in high-duty-cycle SMPS topologies, while its 100 V VRRM rating supports 48 V input bus designs with margin.

The device is rated for 350 A non-repetitive surge current (10 ms sine) and features avalanche capability validated per JEDEC JESD24-11. Thermal design relies on case-to-heatsink conduction, with Rth(j-c) = 1.2 °C/W for TO-220AB mounting under specified torque (0.55 N·m).

Key Specifications

Pinout & Package

TO-220AB package: Insulated metal tab (cathode), 3-pin through-hole outline with center tab electrically connected to cathode. Mounting requires mechanical torque control (0.55 N·m recommended) and thermal interface material for optimal Rth(j-c).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20CPH06-M3 and MBR20100CT, STPS20M100ST offers the lowest VF and best thermal resistance in a single-diode TO-220AB footprint - making it optimal for high-efficiency, space-limited AC/DC adapters where conduction loss and thermal headroom are critical.

Availability

STPS20M100ST 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 STPS20M100ST 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 applications, with STPS20M100ST specifically engineered for low-loss, high-reliability rectification in compact AC/DC and DC/DC power supplies.

FAQ

Is STPS20M100ST suitable for synchronous rectification circuits?

No - STPS20M100ST is a passive Schottky rectifier, not a synchronous rectifier IC or MOSFET-based controller. It functions as a freewheeling or output rectifier in conventional flyback, forward, or buck topologies where gate-driven switching is not required. Synchronous designs require active MOSFETs with timing control circuitry.

What is the maximum recommended heatsink thermal resistance for continuous 20 A operation?

At IF(AV) = 20 A and Tj(max) = 150 °C, with Tamb = 70 °C and Rth(j-c) = 1.2 °C/W, the allowable Rth(c-sink) + Rth(sink-amb) is ≤ 3.4 °C/W. This assumes 12.2 W conduction loss (using VF = 0.61 V) and requires a heatsink with ≤2.2 °C/W total thermal resistance when including interface material.

Does STPS20M100ST have a built-in thermal shutdown feature?

No - this is a discrete Schottky diode with no integrated thermal protection circuitry. Overtemperature protection must be implemented externally via system-level monitoring of heatsink temperature or current limiting in the upstream controller IC.

Can STPS20M100ST replace STPS20M100S in existing designs?

Yes - STPS20M100ST and STPS20M100S share identical electrical specifications and TO-220AB packaging. The "T" suffix denotes tube packaging (vs. tape-and-reel for "SG"), with no functional or parametric difference. Mechanical mounting, thermal design, and circuit behavior remain fully interchangeable.