STMicroelectronics STPS40150CW

Overview

STPS40150CW from STMicroelectronics is a dual-center-tab 150 V, 2 × 20 A average forward current Schottky rectifier in TO-247 package, optimized for high-frequency switching in telecom and industrial SMPS. It delivers typ. 0.69 V forward voltage at 125 °C/20 A per diode, supports 175 °C max junction temperature, and achieves 0.85 °C/W total thermal resistance (junction-to-case) when both diodes operate simultaneously.

For engineers reviewing the STPS40150CW datasheet, STPS40150CW pinout, STPS40150CW application, or STPS40150CW equivalent, key selection criteria include dual-diode thermal coupling behavior, low VF at elevated Tj, avalanche power rating (1015 W at 10 µs), and TO-247 mechanical compatibility with forced-air or heatsink-cooled 40–60 A DC/DC converter designs.

Technical Context

This dual common-cathode Schottky rectifier integrates two independent 150 V/20 A diodes sharing a thermally coupled center tab in TO-247. Its low Qrr and absence of reverse recovery charge enable operation up to several hundred kHz without snubbers.

The device uses platinum-doped silicon to balance leakage (≤11 mA @ 125 °C, VRRM) against forward conduction loss, with VF characterized across IF = 20–40 A and Tj = 25–125 °C. Thermal design must account for Rth(c) = 0.50 °C/W coupling between diodes under simultaneous conduction.

Key Specifications

Pinout & Package

TO-247 package with isolated center tab (pin 3) serving as common cathode for both diodes; anodes are pins 1 and 2. Mounting tab is electrically connected to cathode and requires insulating washer if heatsink is grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPH015 and MBR40150CT, STPS40150CW provides superior thermal coupling control, higher temperature rating, and lower VF-enabling smaller heatsinks and higher reliability in compact, high-efficiency telecom and industrial power supplies.

Availability

STPS40150CW is available at Aetrix Electronics and suitable for telecom AC/DC front-ends, industrial DC/DC converters, and EV charging auxiliary supplies requiring stable component supply and long-term manufacturability.

Supply support for STPS40150CW 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 industrial, automotive, and consumer markets.

STPS40150CW belongs to ST's high-voltage Schottky rectifier product line, engineered specifically for high-frequency, high-efficiency power conversion in telecom infrastructure and industrial power systems where thermal robustness and low conduction loss are critical.

FAQ

What is the maximum continuous current per diode at 100 °C case temperature?

At TC = 100 °C, the STPS40150CW supports 20 A average forward current per diode - same as its rated IF(AV) at TC = 150 °C - because its thermal design allows full current derating only above 150 °C. The device maintains this rating due to its 175 °C Tj(max) and low Rth(j-c).

Can the center tab be used as a thermal pad without electrical isolation?

Yes - the center tab is the common cathode and may be directly bolted to a grounded heatsink if system grounding permits. However, if the heatsink is at a different potential (e.g., floating or high-side referenced), an insulating washer and thermal pad must be used to prevent short circuits while maintaining ≤0.85 °C/W thermal performance.

How does the dual-diode thermal coupling affect power dissipation calculations?

When both diodes conduct simultaneously, junction temperature rise is calculated as ΔTj(diode1) = P₁ × 1.20 + P₂ × 0.50, where 1.20 °C/W is per-diode Rth(j-c) and 0.50 °C/W is the coupling term. This accounts for heat from diode 2 raising diode 1's temperature - essential for accurate thermal simulation in paralleled outputs.

Is STPS40150CW suitable for use in non-isolated buck converters?

Yes - its 150 V VRRM and low VF make it appropriate for high-side synchronous rectification in 48 V input buck converters. However, designers must ensure gate drive timing avoids shoot-through, and layout minimizes parasitic inductance since Schottky reverse recovery is negligible but not zero under fast dV/dt conditions.