STMicroelectronics STPS4045CWY

Overview

STPS4045CWY from STMicroelectronics is a dual center-tap automotive-grade 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 avalanche capability up to 6000 W (1 µs pulse), targeting high-frequency DC–DC converters and free-wheeling in automotive power systems.

For engineers reviewing the STPS4045CWY datasheet, STPS4045CWY pinout, STPS4045CWY application, or STPS4045CWY equivalent, key selection criteria include dual-diode thermal coupling behavior, junction-to-case thermal resistance (0.8 °C/W per diode), AEC-Q101 qualification, and center-tap configuration suitability for synchronous rectification and polarity protection in 12 V/24 V vehicle subsystems.

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 without external node connection. Its low VF and ultrafast recovery eliminate minority-carrier storage delay, supporting >100 kHz switching in SMPS and inverters.

Thermal design relies on conduction cooling via the TO-247 metal tab (Rth(j–c) = 0.8 °C/W per diode); simultaneous conduction of both diodes requires derating using coupled thermal resistance (Rth(c) = 0.1 °C/W) to avoid thermal runaway. Avalanche energy rating (6000 W, 1 µs) enables robust transient overvoltage handling in inductive load circuits.

Key Specifications

Pinout & Package

Package: TO-247 (single-ended, 3-lead, insulated mounting hole, epoxy UL94-V0 compliant). Metal tab serves as common cathode (K) terminal; leads A1 and A2 are anodes. Mounting torque: 0.9–1.2 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS3045CGY and VS-40CPH04-M3, STPS4045CWY uniquely balances 40 A total conduction capability, 45 V rating, AEC-Q101 compliance, and 0.63 V VF - making it the only option qualified for high-efficiency, high-reliability automotive 24 V power conversion without derating or supplemental testing.

Availability

STPS4045CWY is available at Aetrix Electronics and suitable for automotive DC–DC converters, engine control unit power supplies, and electric power steering inverters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STPS4045CWY 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, MCU, power, and automotive ICs with vertical fabrication capacity and broad automotive qualification expertise.

ST's Automotive Power Discrete product line targets high-reliability, high-efficiency power conversion in vehicles - specifically engineered for underhood switching, freewheeling, and protection functions meeting AEC-Q101 and ISO/TS 16949 requirements.

FAQ

What is the maximum allowable case temperature for continuous operation?

The device supports continuous operation at Tc = 150 °C per diode (IF(AV) = 20 A, δ = 0.5). Exceeding this requires linear derating per Figure 2 in the datasheet; at Tc = 160 °C, IF(AV) drops to ~17.5 A per diode. Thermal interface material and heatsink flatness directly impact achievable Tc.

Can STPS4045CWY be used in non-automotive applications?

Yes - its 175 °C max junction temperature, low VF, and avalanche rating make it suitable for industrial UPS, telecom DC–DC, and renewable energy inverters. However, AEC-Q101 qualification does not imply functional safety certification (e.g., ISO 26262), so safety-critical non-automotive use requires separate assessment.

How is the center-tap configured electrically and thermally?

The metal tab is the common cathode (K) for both diodes; A1 and A2 are isolated anodes. Thermally, the tab conducts heat from both die into the heatsink, with coupling resistance Rth(c) = 0.1 °C/W accounting for mutual heating - critical when both diodes conduct simultaneously in phase-shifted topologies.

Is there a recommended PCB footprint or thermal pad layout?

ST specifies TO-247 mechanical dimensions in Table 5 (e.g., tab width 15.45–15.75 mm, mounting hole ∅P = 3.55–3.65 mm). For optimal thermal performance, use ≥2 oz copper on the tab pad, multiple thermal vias (≥8 × 0.3 mm) to inner ground planes, and avoid solder mask over the tab area to ensure direct metal-to-heatsink contact.