STMicroelectronics STPS1150

Overview

STPS1150 from STMicroelectronics is a 150 V, 1 A surface-mount Schottky power rectifier optimized for high-frequency switch-mode power supplies (SMPS) and DC/DC converters operating on ≤24 V rails. It delivers low forward voltage drop (VF = 0.62 V typ. at 125 °C, 1 A), negligible switching losses, and avalanche capability in SMA, SMA Flat Notch, and DO-41 packages.

For engineers reviewing the STPS1150 datasheet, STPS1150 pinout, STPS1150 application, or STPS1150 equivalent, key selection criteria include thermal resistance (Rth(j-l) = 20–30 °C/W), repetitive peak reverse voltage (VRRM = 150 V), junction temperature limit (Tj(max) = 175 °C), and ECOPACK2 compliance for environmental design requirements.

Technical Context

This Schottky rectifier operates without minority-carrier storage delay, enabling zero-recovery switching and eliminating reverse recovery current - critical for high-efficiency, high-frequency (>100 kHz) power conversion stages. Its low VF minimizes conduction loss, while its 175 °C maximum junction temperature supports operation in thermally constrained consumer and computing environments.

The device exhibits avalanche-rated surge capability (PARM = 108 W at tp = 10 µs, Tj = 125 °C) and low thermal resistance to lead (20 °C/W for SMA Flat Notch), allowing direct PCB copper heatsinking without external heatsinks in moderate-power applications up to 15 W.

Key Specifications

Pinout & Package

STPS1150 is offered in three discrete packages: SMA (DO-214AC), SMA Flat Notch (DO-214AC variant with cathode band), and axial DO-41. All are two-terminal devices: Anode and Cathode. The cathode is marked by a band on the body (SMA/SMA Flat Notch) or by the shorter lead (DO-41).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS115H and MBR1150, STPS1150 provides superior thermal performance (20 °C/W), guaranteed avalanche robustness, and lower high-temperature VF - making it preferred for space-constrained, high-reliability consumer and computing power supplies.

Availability

STPS1150 is available at Aetrix Electronics and suitable for laptop DC/DC converters, USB-C PD adapters, and set-top box SMPS requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for STPS1150 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, power, MCU, and sensor solutions for automotive, industrial, and consumer markets.

STPS1150 belongs to ST's high-efficiency Schottky rectifier product line, engineered specifically for high-frequency, low-voltage SMPS in space- and thermal-constrained consumer electronics.

FAQ

Is STPS1150 suitable for synchronous rectification?

No - STPS1150 is an uncontrolled Schottky rectifier with fixed anode-cathode polarity and no gate control. It cannot replace MOSFET-based synchronous rectifiers that require active gate drive timing. It is intended for use in non-synchronous topologies like standard flyback or forward converters where simplicity and cost outweigh peak efficiency gains.

What is the maximum recommended PCB copper area for thermal relief in SMA Flat Notch package?

Per Figure 11 in DS3281 Rev 8, a minimum 1.0 cm² copper area per lead reduces Rth(j-a) from ~50 °C/W to ~30 °C/W on FR4. For optimal thermal performance, ST recommends ≥2.0 cm² per lead (total ≥4.0 cm²) with 35 µm copper thickness - achieving Rth(j-a) ≈ 25 °C/W in still air, sufficient for 1 A continuous operation at 70 °C ambient.

Does STPS1150 require a heatsink in typical 1 A applications?

No external heatsink is required. With Rth(j-l) = 20 °C/W (SMA Flat Notch) and typical PCB copper heatsinking, junction temperature rise is ~20 °C at 1 A and 25 °C ambient. Even at 70 °C ambient, Tj remains below 125 °C - well within the 175 °C absolute maximum - provided minimum copper pad guidelines are followed per Figure 15.

How does STPS1150's avalanche rating compare to standard Schottky diodes?

Unlike most Schottky diodes, STPS1150 is explicitly rated for repetitive avalanche energy (108 W at tp = 10 µs, Tj = 125 °C). This allows safe clamping of inductive switching spikes in flyback transformers or boost chokes without external TVS or RC snubbers - a feature absent in generic 150 V Schottkys like MBR1150 or SS115H, which may fail catastrophically under similar stress.