STMicroelectronics STPS3150UF

Overview

STPS3150UF from STMicroelectronics is a 150 V, 3 A surface-mount Schottky power rectifier in SMB Flat package, optimized for high-frequency DC/DC converters and notebook adapters. It delivers a typical forward voltage of 0.63 V at 125 °C and 3 A, enabling low conduction loss and extended battery life in portable systems. Its 10 °C/W junction-to-lead thermal resistance supports compact thermal design in space-constrained consumer electronics.

For engineers reviewing the STPS3150UF datasheet, STPS3150UF pinout, STPS3150UF application, or STPS3150UF equivalent, key selection criteria include forward voltage at elevated temperature, surge current capability (80 A), thermal resistance under real PCB layout conditions, and ECOPACK2 compliance for RoHS- and REACH-compliant manufacturing.

Technical Context

This Schottky rectifier operates without minority-carrier storage delay, eliminating reverse recovery charge and associated switching losses-critical for >100 kHz SMPS topologies. Its low VF and negligible QRR enable high-efficiency operation in synchronous buck secondary-side rectification and AC-DC adapter PFC stages.

The device uses a planar silicon Schottky barrier structure with metal-silicon interface engineered for stable leakage performance up to 125 °C (max 0.6 mA IR). Thermal management relies on direct lead conduction: Rth(j-l) = 10 °C/W for SMB Flat mounting on 10 mm lead length, validated per AN5088 mounting guidelines.

Key Specifications

Pinout & Package

SMB Flat package: Surface-mount, cathode-banded, lead-free epoxy body (UL94 V0), dimensions 3.30–3.95 mm × 5.10–5.60 mm × 0.75–1.50 mm (L×W×H), weight 0.050 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-3EY15-M3 and SB3150-TB, STPS3150UF provides the lowest verified V_F at operating temperature and the only published 10 °C/W R_th(j-l), making it uniquely suitable for thermally aggressive, high-efficiency portable power designs where junction temperature margin is constrained.

Availability

STPS3150UF is available at Aetrix Electronics and suitable for LED lighting drivers, battery charger output stages, and DC/DC converter secondaries requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for STPS3150UF 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.

STPS3150UF belongs to ST's high-efficiency Schottky rectifier product line, engineered specifically for high-frequency, low-loss power conversion in portable and energy-sensitive applications where thermal density and efficiency are primary constraints.

FAQ

What is the maximum allowable junction temperature for STPS3150UF during continuous operation?

The absolute maximum junction temperature is 175 °C, as specified in Table 1 of DS3283 Rev 7. Continuous operation must ensure T_j remains ≤175 °C under worst-case ambient, power dissipation, and PCB thermal conditions. Derating curves in Figure 2 confirm 3 A average current is sustainable up to 150 °C ambient when mounted on SMB Flat with recommended copper area.

Does STPS3150UF have a specified reverse recovery time (t_rr)?

No-STPS3150UF is a Schottky rectifier and exhibits no minority-carrier storage, so t_rr is not defined. Its switching behavior is governed solely by junction capacitance (C_j ≈ 120 pF at 30 V, Figure 8) and parasitic inductance. This eliminates reverse recovery loss and associated EMI, distinguishing it from fast-recovery PN diodes.

Can STPS3150UF replace a standard PN rectifier in an existing 150 V, 3 A design?

Yes, provided the PCB footprint matches SMB Flat (5.84 mm × 3.44 mm) and cathode polarity is observed. The lower V_F reduces conduction loss by ~0.6 W at 3 A, but thermal design must account for different R_th(j-l) (10 °C/W vs. ~20 °C/W for typical PN diodes), potentially allowing smaller heatsinks or higher ambient operation.

Is STPS3150UF suitable for automotive under-hood applications?

No-while rated to 175 °C junction temperature, STPS3150UF is not qualified to AEC-Q101 and lacks automotive-specific reliability testing (e.g., HTOL, temperature cycling). Its qualification targets consumer and computing applications; for automotive, ST recommends AEC-Q101-certified alternatives like STPS3150A-TR.