STMicroelectronics STPS40150CG

Overview

STPS40150CG from STMicroelectronics is a dual-center-tab 150 V, 2 × 20 A average forward current Schottky rectifier in D²PAK package, optimized for high-frequency switching power supplies with low forward voltage drop (0.69 V typ. at 125 °C, 20 A) and low thermal resistance (R_th(j-c) = 0.85 °C/W total). It serves as the output rectifier in telecom DC/DC converters and SMPS where efficiency and thermal reliability are critical.

For engineers reviewing the STPS40150CG datasheet, STPS40150CG pinout, STPS40150CG application, or STPS40150CG equivalent, key selection criteria include junction-to-case thermal resistance, reverse leakage at 125 °C, dual-diode isolation capability, and ECOPACK®2 compliance for industrial-grade power conversion designs.

Technical Context

This dual Schottky rectifier integrates two independent 150 V, 20 A diodes sharing a common cathode tab - enabling synchronous rectification or parallel output paths without cross-conduction risk. Its low Q_rr and absence of minority-carrier storage support operation beyond 500 kHz in resonant topologies.

The D²PAK package delivers 0.85 °C/W total junction-to-case thermal resistance under simultaneous conduction, enabled by low R_th(c) coupling (0.50 °C/W) between diodes. Thermal runaway is mitigated via strict (dP_tot/dT_j) < (1/R_th(j-a)) design margin at T_j = 175 °C.

Key Specifications

Pinout & Package

D²PAK (TO-263) package with exposed copper thermal pad on underside; center tab is common cathode; pins 1 and 3 are anodes, pin 2 is cathode tab (electrically connected to thermal pad).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPH15 and MBR40150CT, STPS40150CG offers superior board-level thermal integration via D²PAK's planar thermal pad, lower VF at high temperature, and tighter leakage control - making it optimal for space-constrained, convection-cooled telecom and medical systems.

Availability

STPS40150CG is available at Aetrix Electronics and suitable for telecom DC/DC converters, server VRMs, and industrial SMPS requiring stable component supply, long-lifecycle availability, and ECOPACK®2 environmental compliance.

Supply support for STPS40150CG 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.

STPS40150CG belongs to ST's high-voltage Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in telecom infrastructure and medical equipment where thermal robustness and low EMI are mandatory.

FAQ

What is the maximum allowable case temperature for continuous operation?

The STPS40150CG has a maximum junction temperature of 175 °C and a total junction-to-case thermal resistance of 0.85 °C/W. With typical power dissipation of 28 W at 40 A RMS, the case temperature must remain ≤152 °C to maintain safe margin. This is achievable using ≥10 cm² of 2-oz copper on the thermal pad with no additional heatsink.

Can STPS40150CG replace a single 40 A Schottky in a center-tapped transformer design?

Yes - its dual-anode, common-cathode configuration matches center-tapped secondary winding topology directly. Each anode handles up to 20 A average current independently, and the shared cathode simplifies output filtering. Unlike single-die 40 A parts, it avoids current imbalance issues caused by thermal gradients across large silicon dies.

Is the D²PAK thermal pad electrically isolated from the cathode?

No - the exposed copper thermal pad on the underside of the D²PAK package is internally connected to the cathode terminal (Pin 2). It must be routed to the system ground or output rail, not left floating. Electrical isolation requires insulating thermal interface material or a dielectric PCB layer beneath the pad.

Does STPS40150CG support reflow soldering per JEDEC J-STD-020?

Yes - the D²PAK package is qualified for lead-free reflow per JEDEC J-STD-020D, with peak temperature up to 260 °C for 30 seconds. The ECOPACK®2-compliant molding compound withstands multiple thermal cycles without delamination, provided preheat ramp rates stay within 3 °C/s and soak time exceeds 120 s at 150–200 °C.