Taiwan Semiconductor Corporation MBR3090CT

Overview

MBR3090CT from Taiwan Semiconductor is a 30A dual-die Schottky barrier rectifier in TO-220AB package, rated for 90V repetitive peak reverse voltage (VRRM), 200A surge current (IFSM), and maximum junction temperature of 150°C. It delivers low forward voltage drop (0.84V typ. @ 15A, 25°C) and is used in high-efficiency DC/DC converters and industrial switching power supplies.

For engineers reviewing the MBR3090CT datasheet, MBR3090CT pinout, MBR3090CT application, or MBR3090CT equivalent, key selection criteria include its 90V VRRM rating, 1.5°C/W junction-to-case thermal resistance, dual-common-cathode configuration, and AEC-Q101 qualification availability in H-suffix variants.

Technical Context

The MBR3090CT integrates two independent Schottky diodes in a single TO-220AB package with common cathode connection, enabling full-wave rectification or dual-channel output paths. Its guard ring structure provides overvoltage protection, and it supports high dv/dt (10,000 V/μs) for fast-switching topologies.

Thermally, it features a 1.5°C/W junction-to-case resistance, enabling reliable operation at 30A continuous forward current when properly heatsinked. Reverse leakage remains ≤7.5 mA at 125°C and rated 90V VR, supporting stable performance in elevated ambient environments.

Key Specifications

Pinout & Package

Package: TO-220AB - Insulated plastic case with metal tab (cathode-connected), matte tin-plated leads, UL 94V-0 molding compound, and 0.56 N·m max mounting torque.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MBR3090CT, VS-30CPH09 offers better thermal resistance but lacks automotive qualification, while MBR30H90CT matches AEC-Q101 compliance and mechanical form factor but trades 0.01V higher VF-impacting efficiency in thermally constrained 30A designs.

Availability

MBR3090CT is available at Aetrix Electronics and suitable for server power supplies, industrial DC/DC converters, and telecom rectifier modules requiring stable component supply, long-term BOM continuity, and RoHS-compliant sourcing.

Supply support for MBR3090CT 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 communications markets since 1979.

The MBR30xCT series targets high-current, high-efficiency rectification in space-constrained power systems, emphasizing low VF, robust surge capability, and thermal reliability in TO-220AB packaging.

FAQ

What is the maximum junction temperature rating for MBR3090CT?

The MBR3090CT has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table. This allows sustained operation in high-ambient environments such as enclosed power supplies or industrial enclosures when thermal design accounts for its 1.5°C/W junction-to-case resistance. Derating curves confirm usable current down to 0A at 150°C case temperature. The MBR3090CT must be mounted with appropriate thermal interface and heatsinking to maintain this limit under 30A load.

Is MBR3090CT pin-compatible with other parts in the MBR30xCT family?

Yes, all MBR30xCT devices-including MBR3090CT-share identical TO-220AB package dimensions, pinout (anode1–cathode–anode2), and mechanical mounting. Voltage variants (35V to 150V) differ only in internal die construction; PCB layout and heatsink interface remain unchanged. The MBR3090CT can be substituted for MBR3060CT or MBR30100CT without board modification, provided system voltage stress remains within its 90V VRRM rating.

Does MBR3090CT have AEC-Q101 qualification?

The base MBR3090CT is not AEC-Q101 qualified; however, the MBR3090CTH variant-identical in electrical and thermal specs-is explicitly qualified per AEC-Q101. The "H" suffix denotes automotive-grade screening, including extended temperature cycling, humidity testing, and failure analysis. For automotive applications like OBC auxiliary supplies, MBR3090CTH is the compliant choice; MBR3090CT remains suitable for industrial and telecom uses where qualification is not mandated.

What is the forward voltage specification for MBR3090CT at full rated current?

At 30A average forward current and 25°C junction temperature, the MBR3090CT exhibits a maximum forward voltage (VF) of 0.94V per diode, as specified in the electrical characteristics table. At elevated temperature (125°C), VF drops to 0.82V max under the same 30A condition-reflecting Schottky's negative temperature coefficient. These values are measured under pulsed conditions (PW = 0.3ms) and define worst-case conduction loss for thermal modeling of the MBR3090CT in high-power rectifier stages.

How is the cathode terminal implemented in MBR3090CT's TO-220AB package?

In the MBR3090CT, the cathode is internally connected to the metal tab (Pin 2), which serves as the common cathode for both integrated Schottky diodes. Leads 1 and 3 are isolated anodes. When mounting to a heatsink, electrical isolation (e.g., mica washer or insulating pad) is mandatory unless the heatsink is floating or referenced to cathode potential. Polarity is marked on the device body per the official marking diagram, and the MBR3090CT's tab must never be shorted to either anode during assembly or operation.