Taiwan Semiconductor Corporation MBR4090PT

Overview

MBR4090PT from Taiwan Semiconductor is a 40A, 90V dual-die Schottky barrier rectifier in TO-247AD package, featuring 0.84V max forward voltage at 20A/25°C, 10mA max reverse current at 125°C, and 330A surge capability - deployed in high-efficiency DC-DC converters and industrial SMPS.

For engineers reviewing the MBR4090PT datasheet, MBR4090PT pinout, MBR4090PT application, or MBR4090PT equivalent, key selection criteria include V_RRM = 90V, I_F = 40A continuous, R_θJC = 1.2°C/W, TJ max = 150°C, and AEC-Q101 qualification availability (H-suffix variant).

Technical Context

This device integrates two independent Schottky diodes in a single TO-247AD thermally optimized package, enabling dual-channel rectification without inter-die coupling. Its guard ring structure provides overvoltage protection, and the matte tin-plated leads meet J-STD-002 solderability standards.

Designed for high-frequency switching applications, it delivers low conduction loss with dV/dt rating of 10,000 V/μs and supports 8.3ms half-sine surge currents up to 330A - critical for transient resilience in power supplies operating near thermal limits.

Key Specifications

Pinout & Package

Package: TO-247AD (TO-3P), 3-terminal isolated case configuration with center anode / outer cathodes layout; 6.10g mass; UL 94V-0 molding compound; 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 MBR4090PT, VS-40CPH09 offers marginally better conduction efficiency but lacks automotive qualification, while MBR4090CT matches specs but demands layout change due to cathode-common pinout - making MBR4090PT optimal for common-anode, thermally constrained, or AEC-Q101-targeted designs.

Availability

MBR4090PT is available at Aetrix Electronics and suitable for server power supplies, industrial DC-DC converters, and automotive onboard chargers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MBR4090PT 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 industrial, computing, and automotive markets since 1979.

The MBR4090PT belongs to TSC's high-current Schottky rectifier product line, engineered for high-efficiency, high-reliability AC/DC and DC/DC conversion in thermally demanding environments.

FAQ

What is the maximum junction temperature rating for MBR4090PT?

The MBR4090PT has a maximum junction temperature (T_J) of 150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet. This rating enables reliable operation in enclosed industrial power supplies and automotive under-hood applications where ambient temperatures reach 85°C. Derating curves confirm usable current capacity down to 25A at 125°C case temperature. The MBR4090PT must be mounted to a heatsink with adequate thermal interface to maintain T_J ≤ 150°C under full load.

Is MBR4090PT pin-compatible with MBR4090CT?

No, MBR4090PT is not pin-compatible with MBR4090CT. The MBR4090PT uses a common-anode configuration (center terminal = anode), while MBR4090CT uses a common-cathode configuration (center terminal = cathode). Their pinouts are inverted, requiring PCB layout changes. Both share TO-247AD packaging and identical electrical ratings (90V V_RRM, 40A I_F), but the MBR4090PT's terminal assignment is fixed per its datasheet marking diagram and mechanical outline.

Does MBR4090PT have AEC-Q101 qualification?

The base MBR4090PT is not AEC-Q101 qualified; however, the variant MBR4090PTH is explicitly listed in the ordering information as AEC-Q101 qualified. This qualification applies only to the "H" suffix version and covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. For automotive applications requiring qualification, MBR4090PTH - not MBR4090PT - must be specified and sourced.

What is the typical forward voltage of MBR4090PT at full rated current?

The MBR4090PT has a maximum forward voltage (V_F) of 0.84 V at 20A and 25°C, and no guaranteed max value is specified at 40A in the published datasheet. However, typical V_F at 40A/25°C is approximately 0.92 V based on Fig.4 forward characteristics curve. At elevated temperature (125°C), V_F decreases - typical values drop to ~0.74 V at 20A/125°C. Designers should use the 0.84 V spec for worst-case thermal analysis at moderate loads.

What is the thermal resistance from junction to case for MBR4090PT?

The junction-to-case thermal resistance (R_θJC) of MBR4090PT is 1.2°C/W, as specified in the Thermal Performance section of the Taiwan Semiconductor datasheet. This value assumes proper mounting torque (≤1.13 N·m) and use of thermal interface material between the TO-247AD metal tab and heatsink. It enables calculation of junction temperature rise: ΔT_J = P_DISS × 1.2°C/W. For example, at 20W dissipation, T_J rises 24°C above case temperature - critical for thermal design validation of the MBR4090PT.