STMicroelectronics STPS15L25D

Overview

STPS15L25D from STMicroelectronics is a single low-drop Schottky rectifier optimized for secondary-side rectification in 3.3 V switched-mode power supplies and high-frequency DC/DC converters, featuring V_RRM = 25 V, I_F(AV) = 15 A at T_c = 145 °C, V_F(max) = 0.35 V at 15 A / 125 °C, and R_th(j–c) = 1 °C/W in TO-220AC package.

For engineers reviewing the STPS15L25D datasheet, STPS15L25D pinout, STPS15L25D application, or STPS15L25D equivalent, key selection criteria include forward voltage drop at high current and temperature, avalanche energy capability (9000 W @ 1 µs), thermal resistance to case, surge current rating (250 A @ 10 ms), and suitability for compact 3.3 V SMPS output stages with minimal heatsinking.

Technical Context

This device operates as a unidirectional power rectifier with metal–semiconductor junction architecture, enabling near-zero reverse recovery charge and eliminating minority-carrier storage delay. Its low V_F and high I_FSM support high-efficiency, high-density power conversion topologies where conduction loss minimization is critical.

The specified dV/dt rating of 10,000 V/µs confirms robustness against fast transient voltage spikes in synchronous or resonant converter environments. Avalanche capability is fully characterized - P_ARM = 9000 W at T_j = 25 °C and t_p = 1 µs - enabling reliable operation under short-circuit or overload conditions without external clamping.

Key Specifications

Pinout & Package

TO-220AC package with isolated tab (case = cathode); mechanical mounting via screw through central hole; electrically insulated heatsink interface required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS15P25 and MBR1525CT, STPS15L25D delivers superior thermal performance (1 °C/W vs. ≥1.5 °C/W), lower forward drop (0.35 V vs. ≥0.45 V), and uniquely specified avalanche energy - making it the preferred choice for thermally constrained, high-surge 3.3 V SMPS where reliability and efficiency are co-prioritized.

Availability

STPS15L25D is available at Aetrix Electronics and suitable for server VRM output rectification, industrial PLC 3.3 V power modules, and telecom baseband board PSUs requiring stable component supply across extended production lifecycles.

Supply support for STPS15L25D 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

STPS15L25D belongs to ST's Power Schottky Rectifier product line, engineered specifically for high-efficiency, high-current secondary-side rectification in low-voltage (<5 V) switched-mode power supplies and DC/DC converters.

FAQ

Is STPS15L25D suitable for synchronous rectification topologies?

No - STPS15L25D is a passive Schottky rectifier and lacks gate control or driver integration. It functions only as a freewheeling or output rectifier in non-synchronous (diode-based) topologies. For synchronous rectification, discrete MOSFETs or integrated SR controllers such as STSR3 or MP6908 must be used instead.

What is the maximum recommended mounting torque for the TO-220AC tab?

The manufacturer specifies a recommended torque value of 0.55 N·m and a maximum torque of 0.70 N·m for the central mounting screw. Exceeding 0.70 N·m risks mechanical damage to the leadframe or internal die attach, potentially degrading thermal performance or causing premature failure under thermal cycling.

Does STPS15L25D require a heatsink for 15 A continuous operation?

Yes - at I_F(AV) = 15 A and T_c = 145 °C, the junction-to-case thermal resistance (1 °C/W) implies a minimum heatsink thermal resistance of ≤15 °C/W to maintain T_j ≤ 150 °C with 25 °C ambient. A heatsink is mandatory; PCB copper alone is insufficient for sustained 15 A operation.

How does the 9000 W avalanche rating translate to real-world fault protection?

The 9000 W rating applies to a 1 µs pulse at T_j = 25 °C and corresponds to ~9 J of energy. In practice, this enables the device to absorb single-event overloads up to 250 A for 10 µs or ~100 A for 100 µs without failure - sufficient for most SMPS short-circuit transients but not for sustained faults requiring upstream current limiting.