Taiwan Semiconductor Corporation MBR4045PTH

Overview

MBR4045PTH from Taiwan Semiconductor is a 40A, 45V AEC-Q101-qualified Schottky barrier rectifier in TO-247AD package, featuring 0.75V max forward voltage at 20A/25°C, 330A surge capability, and guard ring overvoltage protection-used in automotive-grade DC-DC converters and industrial SMPS.

For engineers reviewing the MBR4045PTH datasheet, MBR4045PTH pinout, MBR4045PTH application, or MBR4045PTH equivalent, key selection criteria include peak reverse voltage (45 V), junction-to-case thermal resistance (1.2 °C/W), AEC-Q101 qualification status, and dual-die configuration for high-current rectification in thermally constrained power stages.

Technical Context

This device implements a dual-die Schottky structure in a single TO-247AD package, enabling parallel conduction paths with shared thermal mass. Its guard ring design enhances ruggedness against transient overvoltage events, while the matte tin-plated leads ensure J-STD-002 solderability and JESD201 Class 2 whisker resistance.

The MBR4045PTH operates across –55°C to +150°C junction temperature range and delivers 0.75 V max VF at 20 A/25°C and 0.75 V max VF at 40 A/125°C-critical for maintaining efficiency in high-temperature automotive power supplies where thermal derating must be precisely modeled.

Key Specifications

Pinout & Package

Package: TO-247AD (TO-3P) - Isolated case, 3-terminal through-hole package with center anode/cathode configuration and mechanical mounting hole; 6.10 g weight; UL 94V-0 molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-MBR4045CT and MBR4045CT, the MBR4045PTH provides verified AEC-Q101 qualification, integrated guard ring, and dual-die thermal architecture-making it the preferred choice for automotive and high-reliability industrial rectification where transient robustness and thermal uniformity are design-critical.

Availability

MBR4045PTH is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial SMPS, and LED streetlight power supplies requiring stable component supply, long-term lifecycle support, and traceable AEC-Q101-compliant sourcing.

Supply support for MBR4045PTH 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 computing markets since 1979.

The MBR4045PTH belongs to TSC's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for high-current, high-reliability rectification in automotive power conversion and ruggedized industrial power supplies.

FAQ

What is the maximum junction temperature rating for the MBR4045PTH?

The MBR4045PTH has a maximum junction temperature (TJ max) of +150°C, validated across its full operating range from –55°C to +150°C. This rating enables deployment in under-hood automotive environments and sealed industrial enclosures where ambient temperatures exceed 85°C. Thermal design must account for RθJC = 1.2 °C/W and actual power dissipation derived from VF and IF waveforms in the target application.

Is the MBR4045PTH pin-compatible with standard TO-247AD rectifiers?

Yes, the MBR4045PTH uses the industry-standard TO-247AD (TO-3P) footprint with three terminals: Anode 1, Cathode (common), and Anode 2. Its mechanical dimensions, mounting hole position, and lead pitch match JEDEC TO-247AD specifications. However, the dual-anode configuration differs from single-die TO-247 rectifiers-PCB layout must allocate separate traces for both anodes to preserve current sharing and thermal symmetry.

Does the MBR4045PTH have AEC-Q101 qualification documentation available?

Yes, the "H" suffix in MBR4045PTH explicitly denotes AEC-Q101 qualification per the manufacturer's ordering information. Taiwan Semiconductor provides full AEC-Q101 test reports covering HTGB, temperature cycling, HTRB, and ESD-available upon request for qualified customers. The device meets stress test requirements for automotive power modules without requiring additional qualification effort.

What is the forward voltage specification for the MBR4045PTH at full rated current?

At 40 A and TJ = 25°C, the MBR4045PTH has a maximum forward voltage (VF) of 0.80 V. At elevated temperature (TJ = 125°C), VF remains ≤ 0.75 V under the same 40 A condition. These values reflect worst-case conduction loss across both dies and are measured per the datasheet's pulse-test conditions (PW = 0.3 ms), supporting accurate thermal modeling in continuous-conduction-mode power supplies.

How does the guard ring feature improve reliability in the MBR4045PTH?

The guard ring in the MBR4045PTH prevents edge-induced avalanche breakdown by controlling electric field distribution at the silicon periphery. It enables the device to sustain critical rate-of-rise voltage (dV/dt) up to 10,000 V/μs-essential for surviving load dump transients in 12 V automotive systems. This structural enhancement directly improves long-term reliability in high-di/dt switching applications without requiring external snubbers.