STMicroelectronics STPS1545DY

Overview

STPS1545DY from STMicroelectronics is an automotive-grade Schottky rectifier diode in TO-220AC package, rated for 15 A average forward current, 45 V repetitive peak reverse voltage, and 175 °C maximum junction temperature. It delivers low conduction loss (VF = 0.50 V typ. at 15 A, 125 °C) and negligible switching losses, enabling high-efficiency operation in low-voltage, high-frequency DC/DC converters and automotive free-wheeling circuits.

For engineers reviewing the STPS1545DY datasheet, STPS1545DY pinout, STPS1545DY application, or STPS1545DY equivalent, key selection criteria include its AEC-Q101 qualification, 400 W repetitive avalanche power rating at 125 °C, 1.6 °C/W junction-to-case thermal resistance, and suitability for polarity protection and synchronous rectification in 12 V/24 V automotive systems.

Technical Context

This Schottky rectifier operates as a unidirectional power switch with zero minority-carrier storage, enabling ultrafast recovery (no reverse recovery time) and minimal switching loss. Its avalanche capability is fully characterized per ST AN1768 and AN2025, supporting robust operation under transient overvoltage conditions in automotive power rails.

The device uses a single-chip planar Schottky structure with metal-silicon barrier contact, optimized for low VF and high IR tolerance up to 125 °C. Thermal design relies on direct conduction cooling via the TO-220AC case, requiring mechanical torque control (0.55 N·m recommended) for heatsink mounting.

Key Specifications

Pinout & Package

TO-220AC package with isolated tab (case), three-terminal configuration: Anode (pin 1), Cathode (pin 2), and electrically connected metal tab (pin 3, cathode-connected). Mounting hole centered on tab for heatsink screw attachment; epoxy meets UL94 V0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS1545DY, STPS1545CGY trades thermal performance for isolation, while VS-15EWH04-M3 offers identical packaging and qualification but with marginally higher forward drop-both require validation of mechanical fit and thermal interface in production assemblies.

Availability

STPS1545DY is available at Aetrix Electronics and suitable for automotive DC/DC converters, engine control unit (ECU) power supplies, and start-stop system energy recovery circuits requiring stable component supply and long-term lifecycle support.

Supply support for STPS1545DY 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.

The STPS-Y series targets automotive power conversion with AEC-Q101-qualified Schottky rectifiers optimized for high-frequency, low-loss operation in harsh underhood environments.

FAQ

Is STPS1545DY suitable for synchronous rectification?

Yes. Its zero reverse recovery charge (Qrr = 0) and low VF make it ideal for synchronous rectification in high-frequency DC/DC converters. Unlike PN diodes, it avoids shoot-through risk and switching loss, enabling efficient operation above 300 kHz without gate timing complexity.

What is the maximum allowable case temperature during operation?

The maximum case temperature is limited by the 175 °C junction temperature rating and thermal resistance. With Rth(j-c) = 1.6 °C/W and 30 W dissipation, case temperature must remain ≤127 °C to maintain safe junction operation. Derate linearly above 25 °C ambient per Figure 2.

Does STPS1545DY require a heatsink in automotive applications?

Yes. At 15 A IF(AV), power dissipation reaches ~7.5 W (based on VF = 0.50 V). Without a heatsink, junction temperature would exceed 175 °C within seconds. A minimum 15 °C/W heatsink (per Figure 2) is required for continuous operation at full rating in 85 °C ambient.

How is avalanche capability validated for STPS1545DY?

Avalanche capability is validated per STMicroelectronics Application Notes AN1768 and AN2025 using controlled 10 µs pulses at Tj = 125 °C. The 400 W PARM rating reflects tested repetitive energy handling, not single-pulse survival-designers must ensure pulse duty cycle and thermal management prevent cumulative junction heating.