STMicroelectronics STPS2150RL

Overview

STPS2150RL from STMicroelectronics is a 150 V, 2 A surface-mount Schottky power rectifier in SMA package, optimized for high-frequency switch-mode power supplies and DC/DC converters operating on ≤24 V rails. It delivers low forward voltage drop (0.62 V typ. at 125 °C, 2 A), negligible switching losses, and avalanche capability with 170 W peak repetitive avalanche power at 10 µs pulse width.

For engineers reviewing the STPS2150RL datasheet, STPS2150RL pinout, STPS2150RL application, or STPS2150RL equivalent, key selection criteria include thermal resistance (20 °C/W junction-to-lead), ECOPACK2 compliance, 175 °C max junction temperature, and validated performance in telecom power and consumer SMPS designs requiring low conduction loss and stable thermal behavior.

Technical Context

This Schottky rectifier operates as a unidirectional power switching diode with zero minority-carrier storage, enabling ultrafast recovery and eliminating reverse recovery charge. Its low VF minimizes conduction loss in high-duty-cycle converters, while its 150 V VRRM rating supports input stages of 24 V–48 V systems with margin against transient overvoltage.

The device uses a planar silicon epitaxial structure with metal-semiconductor junction, achieving 1.5 µA reverse leakage at 25 °C and 1.5 mA at 125 °C under full VRRM. Thermal design relies on direct conduction cooling via leads, with Rth(j-L) = 20 °C/W in SMA package and derating curves defined for ambient temperatures up to 175 °C.

Key Specifications

Pinout & Package

STPS2150RL is packaged in the standard SMA (DO-214AC) surface-mount outline, featuring two terminals: anode and cathode. The cathode is marked by a band on the body. Thermal performance is optimized via lead conduction, with recommended footprint per Figure 14 (5.43 mm × 2.63 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS315H and MBR2150F, STPS2150RL offers superior thermal resistance (20 °C/W), lower VF at elevated temperature (0.62 V @ 125 °C), and guaranteed avalanche capability-making it optimal for high-reliability, high-frequency, thermally constrained telecom and computing power supplies.

Availability

STPS2150RL is available at Aetrix Electronics and suitable for telecom power supplies, laptop AC-DC adapters, industrial PLC power modules, and USB-C PD fast chargers requiring stable component supply and consistent thermal performance across production batches.

Supply support for STPS2150RL 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 automotive, industrial, and consumer markets.

STPS2150RL belongs to ST's high-efficiency power Schottky rectifier product line, engineered specifically for high-frequency switch-mode power conversion where low VF, thermal robustness, and avalanche reliability are critical.

FAQ

What is the maximum allowable ambient temperature for STPS2150RL in a 2 A continuous application?

At 2 A average forward current and using the SMA package on a standard FR4 PCB with minimal copper, the maximum ambient temperature is 85 °C. This assumes junction temperature remains ≤175 °C, leveraging the 20 °C/W Rth(j-L) and typical thermal path to board. Derating curves in Figure 2 confirm 2 A is sustainable up to 85 °C ambient with Rth(j-a) ≈ 100 °C/W.

Does STPS2150RL require a heatsink in typical SMPS applications?

No heatsink is required for STPS2150RL in most SMPS applications dissipating ≤1.5 W. Its 20 °C/W Rth(j-L) enables sufficient heat transfer through PCB copper pads and traces. Datasheet Figure 10 shows Rth(j-a) drops to ~40 °C/W with 2 cm² copper per lead, making external heatsinks unnecessary unless power dissipation exceeds 2.5 W or ambient exceeds 70 °C.

How does the avalanche rating of STPS2150RL improve system reliability?

The 170 W repetitive avalanche power rating (at 10 µs, Tj = 125 °C) ensures safe clamping of inductive energy during MOSFET turn-off transients in flyback or boost converters. Unlike non-avalanche-rated diodes, STPS2150RL absorbs this energy without failure, eliminating need for external snubber networks and reducing component count and board space.

Is STPS2150RL compatible with lead-free reflow soldering profiles?

Yes, STPS2150RL is qualified for standard lead-free reflow per JEDEC J-STD-020. Its epoxy meets UL 94 V0 and ECOPACK2 requirements, supporting peak temperatures up to 260 °C for 30 seconds. The SMA package's thermal mass and lead finish are designed for compatibility with IPC-A-610 Class 2 and Class 3 assembly processes.