Taiwan Semiconductor Corporation MBRF2045

Overview

MBRF2045 from Taiwan Semiconductor is a 20A, 45V Schottky barrier rectifier in ITO-220AC package, designed for high-efficiency DC/DC conversion and SMPS output rectification. It delivers low forward voltage (0.75 V at 20 A, 25°C), high surge capability (150 A IFSM), and operates up to 150°C junction temperature.

For engineers reviewing the MBRF2045 datasheet, MBRF2045 pinout, MBRF2045 application, or MBRF2045 equivalent, key selection factors include its 45 V VRRM rating, 3°C/W junction-to-case thermal resistance, AEC-Q101 qualification option (MBRF2045H), and compatibility with high-frequency switching topologies requiring low conduction loss.

Technical Context

This single-die Schottky rectifier uses a guard ring structure for over-voltage protection and exhibits fast recovery with dv/dt rating of 10,000 V/µs. Its low VF and high IFSM support high-power-density designs where thermal management and efficiency are critical.

Rated for continuous 20 A forward current and capable of 40 A peak repetitive forward current (square wave, 20 kHz), the MBRF2045 maintains stable reverse leakage (<200 µA at 25°C, <15 mA at 125°C) across its 45 V blocking range - enabling reliable operation in automotive and industrial power supplies.

Key Specifications

Pinout & Package

Package: ITO-220AC - Insulated TO-220 variant with isolated tab, UL 94V-0 molding compound, matte tin-plated leads, and 0.56 N·m maximum mounting torque. Polarity marked on device body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20BQ045P-M3/4B, MBRF2045 offers electrical isolation without added hardware; versus MBR2045CT, it provides higher single-path current capacity and drop-in replacement in existing ITO-220AC footprints.

Availability

MBRF2045 is available at Aetrix Electronics and suitable for server power supplies, automotive DC/DC converters, and laptop adapters requiring stable component supply and consistent thermal performance across production volumes.

Supply support for MBRF2045 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and automotive markets since 1979.

The MBRF20xx series was developed to deliver high-current Schottky rectifiers with robust thermal performance and automotive-grade reliability - targeting high-efficiency, high-reliability power conversion in space-constrained systems.

FAQ

What is the maximum junction temperature rating for MBRF2045?

The MBRF2045 has a maximum junction temperature (TJ max) of 150°C. This rating allows sustained operation in high-ambient environments such as automotive under-hood locations or enclosed industrial power supplies. Derating curves in the datasheet specify usable current limits above 25°C case temperature, and the 3°C/W RθJC value enables accurate thermal modeling when paired with appropriate heatsinking.

Is MBRF2045 electrically isolated between the tab and terminals?

Yes, the MBRF2045 uses the ITO-220AC package, which features an electrically isolated metal tab. The case is insulated from both anode and cathode terminals, allowing direct mounting to a grounded heatsink without additional insulation hardware. This isolation is confirmed by TSC's mechanical drawings and UL recognition file E-326243.

Does MBRF2045 meet automotive qualification standards?

The standard MBRF2045 is not AEC-Q101 qualified, but the MBRF2045H variant is explicitly rated to AEC-Q101. Both share identical electrical specifications and package dimensions; only the H-suffix part undergoes stress testing per AEC-Q101 Rev D. For automotive applications requiring qualification evidence, MBRF2045H must be specified and sourced.

What is the forward voltage of MBRF2045 at elevated temperature?

At 20 A forward current and 125°C junction temperature, the MBRF2045 exhibits a typical forward voltage of 0.65 V. This reduction versus the 0.75 V value at 25°C reflects the negative temperature coefficient of Schottky diodes and supports stable performance during thermal transients in high-load conditions.

How does MBRF2045 compare to silicon PN rectifiers in efficiency-critical designs?

Compared to equivalent 20 A silicon PN rectifiers, the MBRF2045 reduces conduction losses by ~40–50% due to its lower VF (0.75 V vs. 1.1–1.3 V) and absence of reverse recovery charge. This directly improves system efficiency, especially in high-frequency SMPS where switching losses compound with conduction losses - making MBRF2045 particularly advantageous in 100–500 kHz DC/DC converters.