STMicroelectronics STPS1150M

Overview

STPS1150M 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 operating on ≤24 V rails. It delivers low forward voltage drop (0.62 V typ. at 125 °C, 1 A), negligible switching losses, and avalanche capability for robust transient handling in consumer and computing power stages.

For engineers reviewing the STPS1150M datasheet, STPS1150M pinout, STPS1150M application, or STPS1150M equivalent, key selection criteria include forward voltage at elevated temperature, thermal resistance (R_th(j-l) = 30 °C/W), peak reverse voltage rating, avalanche energy tolerance, 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 V_F and high T_j(max) of 175 °C support compact thermal design in space-constrained SMPS layouts.

The device is rated for repetitive peak reverse voltage (V_RRM) of 150 V and surge forward current (I_FSM) up to 50 A (10 ms sinusoidal), with thermal resistance junction-to-lead (R_th(j-l)) specified at 30 °C/W for the SMA package - critical for conduction loss estimation using P = 0.59 × I_F(AV) + 0.08 × I_F(RMS)².

Key Specifications

Pinout & Package

STPS1150M is supplied in the SMA (DO-214AC) surface-mount package, featuring a cathode band marking and lead-free, halogen-free ECOPACK2-compliant epoxy molding compound meeting UL 94 V0.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SS115 and SB1150, STPS1150M provides superior thermal performance (30 °C/W vs. ≥35 °C/W), higher junction temperature rating (175 °C vs. ≤150 °C), and verified repetitive avalanche capability - making it optimal for thermally constrained, high-reliability telecom and industrial power designs.

Availability

STPS1150M is available at Aetrix Electronics and suitable for telecom power supplies, USB-C PD adapters, and industrial PLC power modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for STPS1150M 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.

STPS1150M belongs to ST's high-voltage Schottky rectifier product line, engineered specifically for efficiency-critical, high-frequency power conversion in space- and thermal-constrained applications such as AC-DC adapters and telecom infrastructure.

FAQ

Is STPS1150M pin-compatible with DO-41 through-hole diodes?

No. STPS1150M uses the SMA (DO-214AC) surface-mount package with gull-wing leads, while DO-41 variants (e.g., STPS1150) have axial leads. Footprint, soldering process, and thermal path differ fundamentally - board redesign is required for substitution.

What is the maximum allowable PCB copper area for thermal relief without exceeding T_j(max) at 1 A DC?

With R_th(j-l) = 30 °C/W and typical R_th(l-a) ≈ 40 °C/W for 1 cm² of 35 µm copper per lead, total R_th(j-a) ≈ 70 °C/W. At 1 A and V_F = 0.62 V, power dissipation is 0.62 W, yielding ΔT ≈ 43 °C - well within 175 °C limit even at 85 °C ambient.

Does STPS1150M support bidirectional current flow in reverse polarity protection circuits?

No. As a Schottky rectifier, STPS1150M conducts only anode-to-cathode. In reverse polarity protection, it must be placed with cathode toward the load to block reverse current; forward conduction occurs only during normal operation, not during fault conditions.

Can STPS1150M replace a 1N5819 in a 5 V, 2 A buck converter?

Not directly. STPS1150M is rated for 1 A average forward current; exceeding this risks thermal runaway. For 2 A loads, use STPS2150M (2 A version) or verify derated operation with enhanced copper area and ambient cooling per Figure 2 in DS3281.