Littelfuse Inc. MBRF2045CT

Overview

MBRF2045CT from Diodes Incorporated is a dual common-cathode Schottky barrier rectifier in TO-220AB package, rated 45 V reverse voltage and 10 A average forward current per leg, with maximum 0.64 V forward voltage at 10 A and +25°C, used as polarity protection and freewheeling diode in DC power supplies and motor drive circuits.

For engineers reviewing the MBRF2045CT datasheet, MBRF2045CT pinout, MBRF2045CT application, or MBRF2045CT equivalent, key selection criteria include low VF for efficiency-sensitive 12–24 V systems, TO-220AB thermal performance (RθJC = 2°C/W), dual-leg configuration for half-bridge or dual-rail rectification, and AEC-Q101 qualification for industrial reliability.

Technical Context

This device integrates two independent Schottky diodes sharing a common cathode terminal, enabling synchronous rectification or dual-channel output paths. Its guard ring die construction suppresses edge breakdown, supporting stable operation up to +150°C junction temperature.

Designed for high-efficiency switching power conversion, it delivers low conduction loss (VF ≤ 0.64 V @ 10 A, 25°C) and high surge tolerance (IFSM = 180 A, 8.3 ms half-sine), while maintaining leakage < 0.1 mA at rated 45 V blocking voltage and +25°C.

Key Specifications

Pinout & Package

Package: TO-220AB (Type C), molded plastic case with matte tin-plated copper leadframe, UL 94V-0 rated, weight 1.95 g. Mounting tab is cathode-connected and electrically active.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS2045CT and VB2045C-E3/45, MBRF2045CT uniquely combines per-leg 10 A rating, 2°C/W thermal resistance, and AEC-Q101 qualification-enabling compact, reliable dual-rail rectification in thermally constrained industrial and transportation systems.

Availability

MBRF2045CT is available at Aetrix Electronics and suitable for DC power supplies, motor drive circuits, polarity protection systems, and LED driver outputs requiring stable component supply and long-term manufacturability.

Supply support for MBRF2045CT 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The MBRF20xxCT series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical AC/DC and DC/DC conversion in industrial, computing, and automotive auxiliary power systems.

FAQ

What is the maximum junction temperature for continuous operation?

The MBRF2045CT supports continuous operation up to +150°C junction temperature, verified per AEC-Q101 thermal cycling and high-temperature reverse bias tests. Derating begins above +25°C ambient per Figure 4 in DS23016 Rev 14, with 10 A IO maintained up to +75°C ambient when mounted on a 45 mm × 20 mm × 12 mm heatsink.

Is the cathode pin electrically connected to the mounting tab?

Yes-the center pin (Pin 2) and the metal mounting tab are internally connected to the common cathode. This requires electrical isolation from chassis ground unless the system design intentionally references the cathode to earth or heatsink potential. The tab must be soldered or bolted to a heatsink with appropriate insulating hardware if isolation is required.

How does the guard ring structure improve reliability?

The guard ring die construction surrounds the active junction periphery with a doped region that redistributes electric field lines, suppressing surface-initiated avalanche breakdown under high dv/dt or contamination. This extends operational life in noisy switching environments and improves consistency in high-volume automated assembly where solder flux residues may be present.

Can MBRF2045CT replace MBR2045CT in existing designs?

Yes-MBRF2045CT and MBR2045CT share identical electrical specifications, pinout, package dimensions, and thermal characteristics. The "F" suffix denotes flanged TO-220AB (ITO-220AB) variant per Diodes' internal marking code, but both are mechanically and electrically interchangeable in all applications covered by DS23016 Rev 14.