Taiwan Semiconductor Corporation MBR745 C0G

Overview

MBR745 from Taiwan Semiconductor is a 7.5A, 45V Schottky barrier rectifier in TO-220AC package, designed for high-efficiency DC/DC conversion and SMPS secondary-side rectification. It delivers low forward voltage (0.57V at 7.5A, 125°C), high surge capability (150A IFSM), and AEC-Q101 qualification for automotive-grade reliability.

For engineers reviewing the MBR745 datasheet, MBR745 pinout, MBR745 application, or MBR745 equivalent, key selection criteria include its 45V VRRM rating, 150A surge tolerance, thermal resistance (R_θJC = 5°C/W), RoHS/halogen-free compliance, and TO-220AC mechanical compatibility with standard heatsink mounting.

Technical Context

The MBR745 operates as a single-die, unidirectional power rectifier optimized for high-frequency switching topologies. Its guard ring structure provides overvoltage protection, while its low VF and fast recovery enable reduced conduction losses in 20kHz–500kHz converters.

Thermally, it features a junction-to-case resistance of 5°C/W and junction-to-ambient of 15°C/W under natural convection. Reverse leakage remains ≤100µA at 25°C and ≤15mA at 125°C, supporting stable operation across automotive temperature ranges (−55°C to +150°C).

Key Specifications

Pinout & Package

Package: TO-220AC - Three-terminal, through-hole plastic power package with isolated tab (cathode-connected case), matte tin-plated leads, 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 VS-75SQ045N and MBR745G, the Taiwan Semiconductor MBR745 offers identical core ratings and thermal behavior, but distinguishes itself via explicit AEC-Q101 certification on the device marking and halogen-free compliance aligned with IEC 61249-2-21-key for Tier 1 automotive BOM audits.

Availability

MBR745 is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial SMPS secondary rectification, and USB-C PD adapters requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for MBR745 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 power discrete manufacturer headquartered in Hsinchu, Taiwan, serving automotive, industrial, and consumer markets since 1979.

The MBR7xx series targets high-reliability power conversion applications, emphasizing rugged Schottky performance, AEC-Q101 qualification, and thermally efficient TO-220AC packaging for demanding environments.

FAQ

What is the maximum junction temperature rating for the MBR745?

The MBR745 has a maximum junction temperature (T_J) of +150°C, validated across its full operating range from −55°C to +150°C. This rating supports deployment in under-hood automotive locations and sealed industrial enclosures where ambient temperatures exceed 85°C. The device maintains specified electrical performance-including forward voltage and reverse leakage-up to this limit, provided thermal design respects R_θJC = 5°C/W and appropriate heatsinking is applied.

Is the MBR745 pin-compatible with other devices in the MBR7xx family?

Yes, all MBR7xx devices-including MBR735, MBR745, MBR750, up to MBR7150-share identical TO-220AC package dimensions, pinout, and terminal configuration. The anode, cathode, and tab connections are functionally and physically consistent across the family, enabling voltage-scaling design reuse without PCB layout changes. However, forward voltage and reverse leakage vary by voltage rating, so electrical validation is required when substituting within the same footprint.

Does the MBR745 have AEC-Q101 qualification, and how is it indicated?

Yes, the MBR745 is AEC-Q101 qualified, as confirmed in the official Taiwan Semiconductor datasheet (Version K2103). Qualification is indicated by the "H" suffix in ordering codes (e.g., MBR745H), and the device marking includes AEC-Q101 compliance notation. This certification covers stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and highly accelerated stress testing (HAST), making MBR745 suitable for automotive power systems where reliability is mission-critical.

What is the typical forward voltage of the MBR745 at 7.5A and 125°C?

The typical forward voltage (V_F) of the MBR745 is 0.57 V at 7.5 A and 125°C, per the Electrical Specifications table in the Taiwan Semiconductor datasheet. This value reflects actual measured performance under worst-case thermal conditions and is critical for calculating conduction losses in high-temperature applications such as automotive engine compartments or enclosed industrial power supplies.

Can the MBR745 be mounted directly to a heatsink without electrical isolation?

No-the metal tab of the MBR745 is electrically connected to the cathode terminal. Mounting directly to a conductive heatsink creates a cathode-to-chassis short unless the heatsink is either floating or intentionally referenced to the cathode potential. For grounded-chassis systems, electrically isolating hardware (e.g., mica washer + nylon shoulder washer) or insulating thermal pads rated for ≥500V dielectric strength must be used to maintain circuit integrity and safety compliance.