STMicroelectronics STPS2045CFP

Overview

STPS2045CFP from STMicroelectronics is a dual center-tap Schottky rectifier in insulated TO-220FPAB package, rated for 45 V repetitive peak reverse voltage, 2 × 10 A average forward current per diode, and 0.5 V typical forward voltage at 125 °C/10 A. It delivers negligible switching losses and avalanche-rated ruggedness for high-frequency DC–DC converters and low-voltage inverters.

For engineers reviewing the STPS2045CFP datasheet, STPS2045CFP pinout, STPS2045CFP application, or STPS2045CFP equivalent, key selection criteria include its 2000 VRMS insulation rating, 175 °C maximum junction temperature, TO-220FPAB thermal resistance (Rth(j-c) = 4.5 °C/W per diode), and avalanche energy capability (280 W, tp = 10 µs).

Technical Context

This dual Schottky rectifier integrates two independent anode-cathode paths sharing a common cathode terminal (center-tap configuration), enabling synchronous rectification or dual-output flyback topologies. Its ultra-low VF and absence of minority-carrier storage eliminate reverse recovery charge, making it suitable for >100 kHz switching frequencies.

The TO-220FPAB package provides 2000 VRMS isolation between leads and heatsink-mounting surface, with a 0.55 N·m recommended mounting torque. Thermal design must account for coupling effects: when both diodes conduct simultaneously, junction temperature rise includes cross-heating via Rth(c) = 2.5 °C/W.

Key Specifications

Pinout & Package

STPS2045CFP uses the TO-220FPAB package: insulated plastic housing with metal tab (cathode) mounted to heatsink, three leads (A1, K, A2), and 2000 VRMS isolation between tab and leads. Mounting torque: 0.55 N·m (max 0.7 N·m).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS2045CT and STPS20L45CG, STPS2045CFP uniquely balances high isolation integrity, moderate thermal resistance, and through-hole mechanical stability-making it optimal for field-serviceable, safety-critical, or mixed-ground industrial power modules.

Availability

STPS2045CFP is available at Aetrix Electronics and suitable for server VRMs, industrial DC–DC converters, telecom rectifiers, and automotive ADAS power supplies requiring stable component supply and long-term lifecycle support.

Supply support for STPS2045CFP 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, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

STPS2045CFP belongs to ST's Power Schottky Rectifier product line, engineered specifically for high-efficiency, high-frequency switching power conversion where low VF, fast recovery, and rugged avalanche behavior are critical.

FAQ

What is the maximum continuous forward current per diode at 140 °C case temperature?

The STPS2045CFP supports 10 A average forward current per diode at TC = 140 °C, as specified in Table 2 of the datasheet. This rating assumes proper heatsinking and accounts for thermal coupling between diodes via Rth(c) = 2.5 °C/W. Exceeding this value risks junction overheating beyond the 175 °C limit.

Can STPS2045CFP be used in place of a single-diode TO-220 Schottky in a center-tap transformer design?

Yes - STPS2045CFP is explicitly designed for center-tap configurations, with A1 and A2 serving as independent anodes and K as the shared cathode. Its dual-diode structure replaces two discrete Schottky diodes, reducing PCB area and thermal mismatch while maintaining identical electrical interface points.

Is the TO-220FPAB package compatible with standard TO-220 heatsinks?

Yes, the TO-220FPAB outline matches standard TO-220 mechanical dimensions (per Figure 12 and Table 6), allowing direct use with off-the-shelf TO-220 heatsinks. However, because the metal tab is electrically isolated, no insulating washer is needed - unlike TO-220AB - simplifying thermal interface design.

Does STPS2045CFP require derating for avalanche operation at elevated temperatures?

Yes - the 280 W avalanche power rating applies only at Tj = 125 °C and tp = 10 µs. Derating curves in Figure 3 show normalized power drops to ~0.5× at 150 °C and ~0.25× at 175 °C. For reliable avalanche clamping, ensure pulse duration and junction temperature remain within Figure 3 limits.