STMicroelectronics STPS4045CW

Overview

STPS4045CW from STMicroelectronics is a dual center-tap Schottky rectifier in TO-247 package, rated for 2 × 20 A average forward current per diode, 45 V repetitive peak reverse voltage, and maximum junction temperature of 175 °C. It delivers low conduction losses (VF max 0.63 V at 125 °C, 20 A), negligible switching losses, and specified avalanche capability-optimized for high-frequency DC/DC converters and switch-mode power supplies.

For engineers reviewing the STPS4045CW datasheet, STPS4045CW pinout, STPS4045CW application, or STPS4045CW equivalent, key selection criteria include thermal resistance (Rth(j–c) = 1.5 °C/W per diode), surge current rating (220 A, 10 ms), and dual-diode center-tap configuration for synchronous rectification and polarity protection in compact industrial power stages.

Technical Context

This device integrates two independent Schottky diodes sharing a common cathode terminal (center-tap configuration), enabling bidirectional freewheeling or dual-phase output rectification. Its low VF and ultrafast recovery eliminate minority-carrier storage delay, making it suitable for >100 kHz operation without snubbers.

The TO-247 package provides low thermal resistance (1.5 °C/W j–c per diode) and mechanical robustness for high-power density designs. Avalanche energy rating (6000 W, 1 µs pulse) supports transient overvoltage resilience in unregulated input stages without external clamping.

Key Specifications

Pinout & Package

STPS4045CW uses a 3-terminal TO-247 package with center-tap cathode configuration: terminals are Anode 1, Cathode (common), Anode 2. The metal tab is electrically connected to the cathode and serves as primary thermal path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPH045 and MBR4045CT, STPS4045CW offers superior thermal performance (1.5 °C/W), guaranteed avalanche capability (6000 W), and tighter VF control-making it optimal for high-reliability, high-density 400–1000 W industrial power stages where transient immunity and thermal headroom are critical.

Availability

STPS4045CW is available at Aetrix Electronics and suitable for server VRM output stages, industrial DC/DC converters, motor drive freewheeling circuits, and polarity protection circuits requiring stable component supply and long-term manufacturability.

Supply support for STPS4045CW 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.

The STPS4045CW belongs to ST's Power Schottky Rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in industrial and computing applications where low VF, fast switching, and rugged thermal performance are mandatory.

FAQ

What is the maximum junction temperature and how does it affect thermal design?

The STPS4045CW has a maximum operating junction temperature of 175 °C. With Rth(j–c) = 1.5 °C/W per diode and 20 A load, junction-to-case temperature rise is ~30 °C-so case temperature must remain ≤145 °C. This requires a heatsink with ≤1.0 °C/W case-to-ambient resistance when ambient reaches 70 °C, verified via steady-state thermal simulation or IR measurement.

Can STPS4045CW replace a single 40 A Schottky diode in a center-tap transformer design?

Yes-its dual-anode, common-cathode structure matches center-tap transformer secondaries exactly. Unlike a single 40 A diode, it avoids current imbalance and thermal hotspots by splitting conduction across two matched dies. Each diode handles 20 A independently, preserving reliability and enabling symmetrical PCB layout with minimized loop inductance.

Is the TO-247 metal tab electrically isolated from the cathode terminal?

No-the metal tab is internally bonded to the cathode (K) terminal and is not insulated. It must be mounted to a grounded or common-potential heatsink using insulating hardware only if system-level isolation is required. Electrical continuity between tab and K is confirmed in ST's package drawings and validated via continuity test per Doc ID 4605 Rev 5, page 5.

Does STPS4045CW support paralleling for higher current capacity?

Paralleling multiple STPS4045CW units is not recommended. Its VF vs. temperature coefficient is positive but not tightly matched between units, risking current imbalance. For >40 A applications, ST recommends using higher-rated devices like STPS6045CW (2 × 30 A) or evaluating multi-phase topologies with individual STPS4045CW per phase instead of parallel connection.