STMicroelectronics STPS3150U

Overview

STPS3150U from STMicroelectronics is a 150 V, 3 A surface-mount Schottky power rectifier in SMB package, optimized for high-frequency switching applications including DC/DC converters and notebook adapters. It delivers low forward voltage drop (0.63 V typ. at 125 °C, 3 A), negligible switching losses, and operates up to 175 °C junction temperature.

For engineers reviewing the STPS3150U datasheet, STPS3150U pinout, STPS3150U application, or STPS3150U equivalent, key selection criteria include forward voltage drop at elevated temperature, thermal resistance (R_th(j-l) = 20 °C/W), surge current rating (80 A), and ECOPACK2 compliance for environmental design requirements.

Technical Context

This Schottky rectifier uses a planar silicon structure with metal-semiconductor junction to eliminate minority-carrier storage delay, enabling zero reverse recovery time and minimal switching loss. Its low VF and high T_j(max) support compact, high-efficiency designs in space-constrained consumer power supplies.

The device is rated for repetitive peak reverse voltage of 150 V and average forward current of 3 A under TL = 130 °C conditions in SMB package. Thermal performance is defined by junction-to-lead resistance of 20 °C/W, with derating curves confirming stable operation across ambient temperatures up to 125 °C.

Key Specifications

Pinout & Package

STPS3150U is housed in an SMB (DO-214AA) surface-mount package with cathode band marking. The two-terminal device has no internal logic or control pins - Anode and Cathode are accessed via the two leads, with cathode identified by the molded band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-3EY15-M3/57T and SB3150-TB, STPS3150U offers the lowest VF (0.63 V) and tightest thermal resistance (20 °C/W), delivering superior efficiency and thermal headroom in high-density, high-temperature applications like notebook adapters and LED drivers.

Availability

STPS3150U is available at Aetrix Electronics and suitable for LED lighting, battery chargers, and DC/DC converters requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for STPS3150U 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

The STPS series targets high-efficiency power conversion, with STPS3150U specifically engineered for high-frequency, low-loss rectification in compact AC/DC and DC/DC power supplies.

FAQ

What is the maximum allowable case temperature for STPS3150U in SMB package?

The maximum junction temperature is 175 °C. With R_th(j-l) = 20 °C/W and typical PCB copper area, case temperature remains ≤125 °C at 3 A continuous load. Derating curves in DS3283 show safe operation up to 130 °C lead temperature under square-wave conditions.

Does STPS3150U require a heatsink for 3 A operation?

No external heatsink is required. At 3 A and 125 °C junction temperature, the SMB package's 20 °C/W junction-to-lead resistance allows sufficient heat transfer through PCB copper pads. Recommended footprint includes ≥5.1 mm × 5.6 mm copper area per lead for optimal conduction cooling.

How does STPS3150U compare to standard PN-junction rectifiers in switching applications?

Unlike PN diodes, STPS3150U has no reverse recovery charge (Q_rr = 0), eliminating switching loss and associated EMI. Its 0.63 V forward drop at 125 °C is ~30% lower than equivalent 150 V Si rectifiers, directly improving system efficiency and thermal management in high-frequency converters.

Is STPS3150U compatible with lead-free reflow soldering processes?

Yes. STPS3150U is qualified for lead-free reflow per JEDEC J-STD-020, with peak temperature tolerance up to 260 °C. The SMB package uses matte tin plating and complies with IPC/JEDEC J-STD-006B for solderability and intermetallic formation control.