STMicroelectronics STPS3150

Overview

STPS3150 from STMicroelectronics is a 150 V, 3 A surface-mount Schottky power rectifier optimized for high-frequency switch-mode power supplies operating on ≤24 V rails. It delivers a typical forward voltage drop of 0.63 V at 125 °C and 3 A, enabling higher efficiency and extended battery life in compact consumer electronics. Its low thermal resistance (10 °C/W junction-to-lead for SMB Flat) supports reliable operation in LED lighting, notebook adapters, and DC/DC converters.

For engineers reviewing the STPS3150 datasheet, STPS3150 pinout, STPS3150 application, or STPS3150 equivalent, key selection criteria include its 150 V reverse voltage rating, 3 A average forward current capability, 0.63 V typical VF at 125 °C, 175 °C maximum junction temperature, and compatibility with SMB, SMB Flat, SMA Flat Notch, and DO-201AD packages.

Technical Context

The STPS3150 is a unidirectional Schottky barrier diode designed for low-loss freewheeling and output rectification in high-frequency SMPS topologies. Its negligible switching losses stem from zero minority-carrier storage and absence of reverse recovery charge (Qrr ≈ 0), eliminating associated switching energy dissipation.

Thermal performance is defined by package-specific Rth(j-l): 20 °C/W for SMB and SMA Flat Notch, 10 °C/W for SMB Flat, and 15 °C/W for DO-201AD - directly impacting maximum sustainable IF(AV) under ambient conditions and PCB copper area constraints.

Key Specifications

Pinout & Package

STPS3150 is available in four discrete package variants: SMB, SMB Flat, SMA Flat Notch, and DO-201AD - all surface-mount except DO-201AD (axial leaded). Each variant features two terminals: anode and cathode, with cathode identified by a band or notch per JEDEC standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VSS3150-M3/5BT and SB3150-TB, STPS3150 offers the lowest VF (0.63 V) and best thermal resistance (10 °C/W SMB Flat), making it optimal for high-efficiency, space-constrained 24 V-output SMPS where thermal headroom and battery runtime are critical.

Availability

STPS3150 is available at Aetrix Electronics and suitable for LED lighting drivers, battery charger output stages, and DC/DC converter output rectifiers requiring stable component supply and consistent ECOPACK2 compliance.

Supply support for STPS3150 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 STPS3150 specifically engineered for low-VF, high-frequency Schottky rectification in compact AC-DC and DC-DC systems up to 24 V output.

FAQ

What is the maximum allowable surge current for STPS3150 in SMB package?

The STPS3150 in SMB package supports a non-repetitive surge forward current (IFSM) of 80 A for 10 ms sinusoidal waveform, as specified in Table 1 of DS3283 Rev 7. This rating applies at TL = 130 °C and assumes proper PCB thermal design to avoid junction overheating during transient events.

Can STPS3150 be used in place of a standard PN-junction rectifier in a 24 V flyback converter?

Yes - STPS3150 replaces standard PN rectifiers with significant advantage: zero reverse recovery eliminates switching loss and EMI, while its 0.63 V VF reduces conduction loss by ~35% compared to a typical 1N5822 (VF ≈ 0.95 V). However, its 150 V VRRM requires careful clamp design to avoid exceeding rating during output overvoltage transients.

Which package variant offers the best thermal performance for high-current continuous operation?

The SMB Flat variant provides the best thermal performance with Rth(j-l) = 10 °C/W, enabling 3 A IF(AV) at TL = 150 °C - superior to SMB (20 °C/W), SMA Flat Notch (20 °C/W), and DO-201AD (15 °C/W). Its low 0.050 g mass and compact footprint also support high-density automated assembly.

Is STPS3150 suitable for automotive under-hood applications?

No - although rated to 175 °C junction temperature, STPS3150 is not qualified to AEC-Q101 and lacks automotive-grade screening, traceability, or guaranteed PPAP documentation. It is intended for consumer, computing, and industrial power supplies where ambient temperatures remain below 105 °C and qualification rigor is not mandated.