STMicroelectronics STPS1045FP

Overview

STPS1045FP from STMicroelectronics is a 10 A average forward current, 45 V repetitive peak reverse voltage power Schottky rectifier in insulated TO-220FPAC package with 2000 V DC isolation, 12 pF capacitance, and 0.60 V forward voltage at 10 A/125°C. It serves as a low-loss freewheeling diode or polarity protection device in high-frequency DC-DC converters and SMPS secondary-side rectification.

For engineers reviewing the STPS1045FP datasheet, STPS1045FP pinout, STPS1045FP application, or STPS1045FP equivalent, key selection criteria include its 4.5 °C/W junction-to-case thermal resistance, avalanche-rated 4000 W peak power (1 µs), 10000 V/µs critical dV/dt rating, and insulated package suitability for reinforced isolation requirements in industrial power supplies.

Technical Context

This Schottky rectifier uses a single-chip silicon structure optimized for minimal conduction and switching losses in continuous and pulsed high-frequency operation. Its negligible reverse recovery charge and absence of minority-carrier storage enable clean turn-off in synchronous rectifier and flyback snubber circuits.

The TO-220FPAC package integrates an electrically insulated mounting base rated for 2000 V DC isolation, enabling direct heatsink attachment without additional insulating hardware. Thermal performance is defined by R_th(j-c) = 4.5 °C/W and T_j(max) = 175 °C, supporting sustained 10 A conduction at case temperatures up to 145 °C.

Key Specifications

Pinout & Package

STPS1045FP uses the TO-220FPAC package: insulated plastic housing with metal tab isolated from internal die, 2000 V DC isolation rating, 12 pF terminal-to-tab capacitance, and 0.55 Nm recommended mounting torque.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-10BQ040-M3 and MBR1045CT, STPS1045FP uniquely delivers certified 2000 V DC isolation in a single-diode TO-220 footprint-critical for safety-compliant industrial and telecom rectifier boards where creepage/clearance and insulation integrity are design drivers.

Availability

STPS1045FP is available at Aetrix Electronics and suitable for server SMPS, industrial DC-DC converters, automotive body control modules, and telecom rectifier boards requiring stable component supply and long-term lifecycle support.

Supply support for STPS1045FP 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

STPS1045FP belongs to ST's Power Schottky Rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in space-constrained and safety-critical applications where low V_F, fast switching, and reinforced isolation are mandatory.

FAQ

What is the maximum allowable case temperature for continuous 10 A operation?

The STPS1045FP is rated for I_F(AV) = 10 A at T_c = 145 °C, as specified in Absolute Ratings Table 1. Exceeding this case temperature requires derating per Figure 2; at T_c = 125 °C, maximum I_F(AV) drops to approximately 12.5 A, and at T_c = 100 °C, it rises to ~15 A. Thermal design must ensure heatsink interface remains ≤145 °C under worst-case ambient and airflow conditions.

Does the TO-220FPAC package require thermal compound between tab and heatsink?

Yes-despite electrical isolation, the TO-220FPAC tab is the primary thermal path. ST recommends using thermally conductive, electrically insulating compound (e.g., ceramic-filled grease or phase-change pad) to minimize R_th(c-hs). The 4.5 °C/W R_th(j-c) assumes optimal mounting pressure (0.55 Nm torque) and flat, clean heatsink surface; omitting compound increases total thermal resistance by ≥1.2 °C/W.

Can STPS1045FP replace a standard TO-220AC rectifier in an existing PCB layout?

No-STPS1045FP (TO-220FPAC) has different mechanical dimensions than TO-220AC, including longer L3 (28.6–30.6 mm vs. 16.4 mm typ.) and added G1 shoulder for insulation. Footprint compatibility requires verification against Figure 13 dimensions; mounting hole alignment and tab clearance differ. Direct replacement risks mechanical interference and insufficient creepage distance.

Is STPS1045FP compliant with lead-free soldering standards?

Yes-STPS1045FP is supplied in ECOPACK® packaging with lead-free second-level interconnect, compliant with JEDEC JESD97. The inner box label specifies maximum reflow profile parameters (e.g., peak temperature ≤260 °C, time above 217 °C ≤60 s). ST confirms compatibility with standard Pb-free reflow processes; no special prebake or moisture sensitivity handling is required (MSL level not specified, but typical for epoxy packages is MSL 1).