STMicroelectronics STPS745G

Overview

STPS745 from STMicroelectronics is a 45 V, 7.5 A average forward current silicon Schottky rectifier in TO-220FPAC insulated package, optimized for high-frequency DC/DC converters and SMPS secondary-side rectification. It delivers typ. 0.5 V forward voltage at 7.5 A and 125 °C, supports 150 A non-repetitive surge current, and features 2000 VRMS insulation rating and avalanche capability.

For engineers reviewing the STPS745 datasheet, STPS745 pinout, STPS745 application, or STPS745 equivalent, key selection criteria include low conduction loss (P = 0.42×IF(AV) + 0.020×IF²(RMS)), thermal resistance (Rth(j-c) = 5.5 °C/W), junction temperature limit (175 °C), and insulated package compliance for safety-critical power stages.

Technical Context

This single-anode Schottky diode operates without minority-carrier storage, enabling negligible switching losses and extremely fast recovery-critical for >100 kHz switching topologies. Its metal–semiconductor junction provides low VF and high IF(AV) density, while the TO-220FPAC's insulated case eliminates need for mounting insulators in grounded heatsink configurations.

The device is rated for repetitive avalanche energy (190 W at tp = 10 µs, Tj = 125 °C) and exhibits stable reverse leakage (<15 mA at 125 °C, VR = 45 V). Thermal design relies on junction-to-case conduction (5.5 °C/W), with derating required above TC = 145 °C to maintain Tj ≤ 175 °C.

Key Specifications

Pinout & Package

STPS745 in TO-220FPAC package has three terminals: Anode (pin 1), Cathode (pin 2), and insulated metal tab (pin 3, electrically isolated from leads). The tab serves as primary thermal path and must be mounted to heatsink; no electrical connection to circuit ground is required due to 2000 VRMS insulation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-75SQ045 and SB745, STPS745 uniquely combines insulation, thermal robustness, and industry-standard TO-220FPAC mechanical compatibility-making it optimal for safety-certified, chassis-grounded power supplies where mounting simplicity and reliability are prioritized over minimal Rth(j-c).

Availability

STPS745 is available at Aetrix Electronics and suitable for server power supplies, industrial DC/DC converters, and automotive onboard charger auxiliary supplies requiring stable component supply and long-term lifecycle support.

Supply support for STPS745 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 industrial, automotive, and consumer markets.

The STPS series targets high-efficiency, high-reliability power conversion-specifically engineered for SMPS secondary-side rectification, freewheeling, and polarity protection where low VF, fast switching, and rugged packaging are critical.

FAQ

What is the maximum allowable case temperature for continuous operation?

The STPS745 in TO-220FPAC is rated for IF(AV) = 7.5 A at TC = 145 °C. Exceeding this temperature requires linear derating of average current to ensure Tj does not exceed +175 °C. Derating curves are provided in Figure 2 of the datasheet (DocID3516 Rev 8, page 3), showing IF(AV) drops to ~4.5 A at TC = 175 °C.

Can STPS745 replace a standard PN rectifier in an existing 48 V SMPS design?

Yes-provided VRRM ≥ 48 V and peak reverse voltage remains below 45 V. STPS745's 0.5 V VF reduces conduction loss significantly, but its lack of reverse recovery makes it unsuitable for line-frequency rectification. Verify layout thermal paths, as TO-220FPAC's Rth(j-c) = 5.5 °C/W differs from typical TO-220AC parts.

Is the insulated tab rated for continuous high-voltage potential relative to circuit ground?

Yes-the TO-220FPAC package is tested to 2000 VRMS sine-wave insulation between tab and leads. This rating applies under steady-state conditions per IEC 60950-1; transient overvoltage immunity depends on system-level creepage/clearance and must be validated per end-equipment safety standards.

Does STPS745 require snubber circuits in high-frequency flyback applications?

No snubber is needed for reverse recovery (Qrr ≈ 0), but a small RC snubber across the diode may still be used to damp ringing caused by parasitic inductance in high-di/dt layouts. The 190 W avalanche rating provides margin against voltage spikes from leakage inductance, reducing reliance on external clamping.