Taiwan Semiconductor Corporation MBR1045 C0G

Overview

MBR1045 from Taiwan Semiconductor is a 10A, 45V Schottky barrier rectifier in TO-220AC package, featuring low forward voltage (0.70 V at 10 A, 25°C), high surge current capability (150 A), and junction-to-case thermal resistance of 3°C/W. It serves as a primary output rectifier in high-efficiency DC/DC converters and switching power supplies.

For engineers reviewing the MBR1045 datasheet, MBR1045 pinout, MBR1045 application, or MBR1045 equivalent, key selection criteria include repetitive peak reverse voltage (45 V), forward voltage at rated current and temperature, reverse leakage current at 125°C (15 mA), thermal performance, and AEC-Q101 qualification availability.

Technical Context

The MBR1045 operates as a single-die, unidirectional Schottky rectifier with guard ring structure for overvoltage protection. Its low VF enables reduced conduction loss in high-frequency SMPS topologies, while its 150 A IFSM rating supports robust transient handling during startup or load dump events.

Designed for operation from –55°C to +150°C junction temperature, it delivers stable reverse leakage (<15 mA at 125°C) and maintains dV/dt capability of 10,000 V/µs. The TO-220AC package provides mechanical mounting compatibility and thermal interface suitability for heatsink attachment.

Key Specifications

Pinout & Package

Package: TO-220AC - Three-terminal, through-hole plastic package with isolated tab (cathode-connected), matte tin-plated leads compliant with J-STD-002 solderability, UL 94V-0 molding compound, and 0.56 N·m maximum mounting torque.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MBR1045, VS-10BQ045 offers superior thermal and conduction performance but lacks AEC-Q101 qualification, while SB1040 trades 5 V VRRM margin for lower VF and excludes automotive use-making MBR1045 the balanced choice for industrial and qualified automotive designs.

Availability

MBR1045 is available at Aetrix Electronics and suitable for switching mode power supplies, DC/DC converters, and adapter designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MBR1045 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 device manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and automotive markets since 1979.

The MBR10xx series targets high-efficiency power conversion systems where low VF, high surge tolerance, and thermal robustness are essential-especially in space-constrained, thermally demanding applications.

FAQ

What is the maximum junction temperature rating for MBR1045?

The MBR1045 has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table. This allows reliable operation in high-ambient environments such as enclosed power supplies or under-hood automotive locations. Derating curves confirm usable current capacity down to 0 A at 150°C case temperature. The MBR1045 must be mounted to a heatsink or copper plane to maintain TJ ≤ 150°C under 10 A continuous load.

Is MBR1045 pin-compatible with other TO-220AC Schottky rectifiers?

Yes, MBR1045 uses standard TO-220AC mechanical dimensions and terminal spacing, making it physically interchangeable with industry-standard 3-pin TO-220AC Schottky rectifiers like STPS1045D or Vishay VS-10BQ045. However, electrical characteristics-including VF, IR, and thermal resistance-differ between vendors, so electrical validation is required before substitution. The MBR1045 cathode is connected to the metal tab, consistent with TO-220AC convention.

Does MBR1045 support automotive-grade qualification?

The base MBR1045 is not AEC-Q101 qualified, but Taiwan Semiconductor offers the MBR1045H variant which is fully AEC-Q101 qualified for automotive applications. The "H" suffix denotes qualification per stress test conditions including temperature cycling, humidity bias, and ESD. For body control modules or infotainment power supplies requiring automotive reliability, specify MBR1045H-not MBR1045-when ordering.

What is the reverse leakage current of MBR1045 at elevated temperature?

At rated reverse voltage (45 V) and junction temperature of 125°C, the MBR1045 exhibits a maximum reverse leakage current (IR) of 15 mA, as specified in the electrical characteristics table. This value is critical for standby power budgeting in always-on systems. At 25°C and 45 V, IR is limited to 100 µA. The MBR1045's leakage remains stable across temperature due to its optimized Schottky barrier metallization.

How does the guard ring feature improve MBR1045 reliability?

The guard ring in the MBR1045 die structure distributes electric field stress at the PN junction edge, preventing premature avalanche breakdown during voltage transients. This extends operational life under repetitive line surges or inductive kickback events common in motor drives and SMPS. Unlike non-guarded Schottky devices, the MBR1045 maintains VRRM integrity without derating-even after exposure to 1000+ transient cycles-enhancing long-term reliability in harsh environments.