STMicroelectronics STPS1545D

Overview

STPS1545D from STMicroelectronics is a 45 V, 15 A average forward current power Schottky rectifier in TO-220AC package, optimized for low-conduction-loss operation in high-frequency DC–DC converters and SMPS secondary-side rectification. It features a typical forward voltage of 0.5 V at 15 A and 125 °C, 2000 VRMS insulation rating, and avalanche-rated capability up to 430 W (10 µs pulse).

For engineers reviewing the STPS1545D datasheet, STPS1545D pinout, STPS1545D application, or STPS1545D equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance (Rth(j-c) = 1.6 °C/W), junction temperature limit (175 °C), insulating package compliance, and avalanche energy handling in flyback or freewheeling topologies.

Technical Context

This Schottky rectifier operates without minority-carrier storage, enabling negligible reverse recovery time and eliminating switching losses in high-frequency (>100 kHz) power stages. Its metal–semiconductor junction delivers fast turn-on/turn-off behavior critical for synchronous rectification replacement and low-voltage output rails.

The device is rated for repetitive peak reverse voltage (VRRM) of 45 V and supports surge currents up to 220 A (10 ms sine), with thermal design governed by junction-to-case resistance (1.6 °C/W) and maximum junction temperature (175 °C). Avalanche capability is specified under controlled 10 µs pulses at Tj = 125 °C.

Key Specifications

Pinout & Package

STPS1545D is housed in a TO-220AC package with insulated case (2000 VRMS), three terminals: anode, cathode, and electrically isolated metal tab (cathode-connected). The tab serves as both thermal path and electrical terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-15SQ045 and SB1540, STPS1545D provides superior insulation integrity, higher avalanche energy handling, and tighter VF consistency across temperature-critical for thermally constrained, safety-certified, or high-reliability power supplies.

Availability

STPS1545D is available at Aetrix Electronics and suitable for server VRMs, industrial DC–DC converters, solar microinverter protection, and automotive body control module power supplies requiring stable component supply and long-term manufacturability.

Supply support for STPS1545D 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, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

STPS1545D belongs to ST's Power Schottky Rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion where low VF, fast switching, and rugged avalanche performance are mandatory.

FAQ

Is STPS1545D suitable for synchronous rectification replacement?

Yes - its ultra-low VF (0.5 V typ. @ 15 A/125 °C) and zero reverse recovery charge make it ideal for replacing MOSFET-based synchronous rectifiers in cost-sensitive, medium-power SMPS where gate drive complexity must be avoided. It delivers comparable efficiency without control circuitry.

What is the recommended torque for mounting STPS1545D?

The recommended torque value for the TO-220AC mounting screw is 0.55 N·m, with a maximum allowable torque of 0.7 N·m. Exceeding this may deform the package or compromise internal die attachment, affecting thermal and electrical reliability.

Does STPS1545D require a heatsink in all applications?

Yes - even at 15 A average current, junction temperature rise exceeds safe limits without heatsinking. With Rth(j-c) = 1.6 °C/W and Pcond ≈ 7.5 W (at 15 A/0.5 V), a heatsink maintaining Rth(c-a) ≤ 10 °C/W is required to hold Tj ≤ 125 °C at 70 °C ambient.

Can STPS1545D be used in place of STPS1545FP?

No - STPS1545FP uses TO-220FPAC (insulated plastic) with Rth(j-c) = 4.0 °C/W, while STPS1545D uses TO-220AC (non-insulated metal tab) with Rth(j-c) = 1.6 °C/W. Substitution requires verifying mechanical fit, thermal path, and insulation requirements; electrical specs are identical but thermal performance differs significantly.