STMicroelectronics STPS745D

Overview

STPS745D from STMicroelectronics is a 45 V, 7.5 A average forward current power Schottky rectifier in TO-220AC package, optimized for low-conduction-loss operation in high-frequency switch-mode power supplies and DC-DC converters. It features a typical forward voltage of 0.5 V at 7.5 A and 125 °C, 2000 VRMS insulation rating, and avalanche-rated capability up to 190 W (10 µs pulse).

For engineers reviewing the STPS745D datasheet, STPS745D pinout, STPS745D application, or STPS745D equivalent, key selection criteria include its low VF conduction loss, TO-220AC thermal resistance (Rth(j-c) = 3.0 °C/W), insulated case construction, and suitability for free-wheeling and polarity protection in 12–48 V industrial power rails.

Technical Context

This single-anode Schottky diode operates without minority-carrier storage, enabling negligible reverse recovery time and eliminating switching losses in high-frequency topologies. Its metal-semiconductor junction delivers fast turn-on/turn-off behavior critical for synchronous rectification and flyback snubberless designs.

The TO-220AC package provides direct thermal conduction through the insulated tab (2000 VRMS isolation), supporting mounting on heatsinks without additional insulating hardware. Junction temperature is rated to 175 °C, with derating defined for ambient temperatures up to 150 °C under δ = 0.5 square-wave conditions.

Key Specifications

Pinout & Package

TO-220AC package with insulated metal tab (2000 VRMS isolation), 3-pin configuration: Anode (pin 1), Cathode (pin 2), and electrically isolated tab (pin 3, thermally connected to cathode but not electrically tied).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-745N and MBR745CT, STPS745D offers superior thermal performance (3.0 °C/W), certified 2000 VRMS isolation, and higher junction temperature rating-making it preferred for space-constrained, high-reliability industrial and automotive power stages where thermal management and safety certification are critical.

Availability

STPS745D is available at Aetrix Electronics and suitable for server power supplies, industrial DC-DC converters, and automotive body control modules requiring stable component supply and long-term manufacturability.

Supply support for STPS745D 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The STPS series targets high-efficiency power conversion, with STPS745D developed specifically for low-VF, high-current Schottky rectification in compact, thermally demanding 12–48 V power systems.

FAQ

What is the maximum allowable case temperature for continuous operation?

The STPS745D is rated for IF(AV) = 7.5 A at TC = 160 °C. Operation above this temperature requires derating per Figure 2 in the datasheet; at TC = 175 °C, average current must be reduced to approximately 5.2 A to maintain Tj ≤ 175 °C under δ = 0.5 duty cycle.

Can STPS745D be used in place of a standard silicon rectifier in an existing 48 V telecom supply?

Yes, provided the reverse voltage stress remains below 45 V and thermal design accommodates its lower VF (0.5 V vs. ~0.9 V for silicon). The reduced conduction loss lowers heat sink requirements, but layout must account for its faster switching edge to avoid EMI coupling into adjacent signal traces.

Does the insulated TO-220AC package require thermal compound when mounted to a heatsink?

Yes - although the tab is electrically insulated, thermal interface material (e.g., silicone-based grease or phase-change pad) is required to minimize Rth(c-hs) between the metal tab and heatsink surface. Mechanical torque must be limited to 0.55 Nm (max 0.70 Nm) to avoid package deformation.

Is STPS745D compliant with RoHS and REACH regulations?

Yes - STPS745D is ECOPACK®2 compliant, meeting EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Lead-free termination and halogen-free molding compound are confirmed in ST's official product compliance documentation (DocID3516 Rev 8).