STMicroelectronics STPS1150A

Overview

STPS1150A from STMicroelectronics is a 150 V, 1 A surface-mount Schottky power rectifier in SMA package, optimized for high-frequency switch-mode power supplies and DC/DC converters on ≤24 V rails. It delivers low forward voltage drop (0.62 V typ. at 125 °C), negligible switching losses, and avalanche capability for robust operation in consumer and computing power stages.

For engineers reviewing the STPS1150A datasheet, STPS1150A pinout, STPS1150A application, or STPS1150A equivalent, key selection criteria include forward voltage at 1 A and 125 °C, thermal resistance junction-to-lead (30 °C/W), repetitive peak reverse voltage (150 V), and ECOPACK2 compliance for RoHS-constrained designs.

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 in high-frequency (>100 kHz) topologies. Its low VF reduces conduction loss in low-voltage output stages where efficiency directly impacts battery life.

The device operates up to 175 °C junction temperature and supports surge currents up to 50 A (10 ms sinusoidal) in SMA package. Thermal management relies on conduction cooling via PCB copper pads, with Rth(j-l) = 30 °C/W and Rth(j-a) highly dependent on pad area per lead (e.g., 4.5 °C/W at 200 cm²).

Key Specifications

Pinout & Package

STPS1150A is supplied in SMA (DO-214AC) surface-mount package with cathode band marking. The two-terminal device has anode and cathode leads configured for standard PCB footprint per Figure 13 of DS3281 Rev 8.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS115H and MBR1150, STPS1150A provides superior thermal performance (30 °C/W vs. ≥40 °C/W), higher junction temperature rating (+175 °C), and verified avalanche capability-critical for high-reliability, high-frequency, and automated manufacturing environments.

Availability

STPS1150A is available at Aetrix Electronics and suitable for USB-C power adapters, laptop DC/DC converters, set-top box SMPS, and industrial IoT gateway power stages requiring stable component supply and RoHS-compliant sourcing.

Supply support for STPS1150A 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 STPS1150A belongs to ST's high-efficiency Schottky rectifier product line, engineered specifically for high-frequency, low-voltage-output switch-mode power supplies where low forward voltage and thermal robustness are critical.

FAQ

What is the maximum allowable PCB pad size for optimal thermal performance of STPS1150A?

Per DS3281 Figure 9, thermal resistance junction-to-ambient drops to 4.5 °C/W when each lead is soldered to ≥200 cm² of 35 µm-thick FR4 copper. For typical 4-layer boards, a minimum 1.5 cm² per lead (3 cm² total) achieves Rth(j-a) ≈ 25 °C/W, supporting 1 A at 75 °C ambient without derating.

Does STPS1150A support synchronous rectification replacement in existing designs?

No-STPS1150A is a passive Schottky diode and cannot replace active synchronous rectifiers (e.g., MOSFET drivers). However, it serves as a direct drop-in replacement for other 150 V/1 A SMA Schottky diodes like MBR1150 or SS115H, provided layout accommodates identical footprint and thermal constraints.

How does the 150 V VRRM rating impact design margin in 24 V rail applications?

A 150 V VRRM provides 6.25× overvoltage margin relative to 24 V nominal rail, accommodating worst-case transients including 100 V ring waves (IEC 61000-4-5) and MOSFET switching overshoot. This margin ensures reliable blocking during 120 VAC line surges coupled into low-voltage DC bus via shared ground impedance.

Is STPS1150A suitable for automotive infotainment power supplies?

While STPS1150A meets AEC-Q101 stress test conditions in qualification reports, it is not officially AEC-Q101 qualified. For automotive-critical applications, ST recommends AEC-Q101-certified alternatives such as STPS1H100S or STPS1L60. STPS1150A is approved for industrial and consumer use only.