Taiwan Semiconductor Corporation MBR2045CT

Overview

MBR2045CT from Taiwan Semiconductor is a 20A dual-die Schottky barrier rectifier in TO-220AB package, rated for 45V repetitive peak reverse voltage (V_RRM), with 150A surge capability (I_FSM) and 1°C/W junction-to-case thermal resistance. It delivers low forward voltage drop (0.84V at 20A/25°C) for high-efficiency DC–DC converters and switching power supplies.

For engineers reviewing the MBR2045CT datasheet, MBR2045CT pinout, MBR2045CT application, or MBR2045CT equivalent, key selection criteria include its 45V V_RRM, dual-common-cathode configuration, TO-220AB mechanical compatibility, AEC-Q101 qualification option (MBR2045CTH), and thermal performance under continuous 20A conduction.

Technical Context

The MBR2045CT integrates two independent Schottky diodes in a single TO-220AB package with common cathode connection - confirmed by marking diagram and absolute maximum ratings table showing identical I_F, I_FSM, and T_J limits across both dies. Its guard ring structure provides overvoltage protection, and matte tin-plated leads meet J-STD-002 solderability requirements.

Thermal design is enabled by R_θJC = 1°C/W (typical), validated for MBR2035CT–MBR2045CT variants, supporting high-power density layouts in SMPS where junction temperature must stay ≤150°C under 20A DC load with adequate heatsinking.

Key Specifications

Pinout & Package

Package: TO-220AB, 3-terminal, dual-diode common-cathode configuration. Case material meets UL 94V-0; terminals are matte tin-plated and solderable per J-STD-002. Mounting torque ≤0.56 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20BQ045PbF and ON Semiconductor's MBR2045CT, the Taiwan Semiconductor MBR2045CT offers the lowest thermal resistance (1°C/W) and tightest V_F distribution, making it optimal for space-constrained, thermally aggressive 20A rectification tasks where junction temperature control is critical.

Availability

MBR2045CT is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, and DC–DC converters requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified alternatives (MBR2045CTH).

Supply support for MBR2045CT 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 semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and consumer markets since 1995.

The MBR20xxCT series was developed specifically for high-efficiency, high-reliability secondary-side rectification in compact power systems - emphasizing low V_F, robust surge handling, and automotive-qualified variants.

FAQ

What is the pin configuration of the MBR2045CT?

The MBR2045CT uses a TO-220AB package with three terminals: Pin 1 (left) is Anode 1, Pin 2 (center) is the common cathode, and Pin 3 (right) is Anode 2. This dual-anode/common-cathode arrangement supports independent input paths feeding a shared output node, confirmed in the device marking diagram and absolute maximum ratings table. The MBR2045CT pinout enables flexible use in dual-rail or interleaved topologies without external wiring changes.

Is the MBR2045CT suitable for automotive applications?

Yes - the MBR2045CTH variant is explicitly AEC-Q101 qualified, meeting stress testing requirements for temperature cycling, humidity, and mechanical shock in automotive under-hood environments. While the standard MBR2045CT is not AEC-Q101 certified, its 150°C T_J max, guard ring protection, and 150A I_FSM make it viable for non-safety-critical automotive subsystems such as infotainment power supplies. Always specify MBR2045CTH for qualified automotive deployment.

What is the forward voltage of the MBR2045CT at elevated temperature?

At 20A and 125°C junction temperature, the MBR2045CT exhibits a typical forward voltage of 0.72V per diode - a 14% reduction versus its 25°C value of 0.84V. This negative temperature coefficient improves thermal stability in high-load conditions. The datasheet confirms this behavior across the MBR2035CT–MBR2045CT group via Fig.4 Typical Forward Characteristics curves, enabling accurate loss modeling up to T_J = 150°C.

Does the MBR2045CT have RoHS and halogen-free compliance?

Yes - the MBR2045CT is fully RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. This is explicitly stated in the FEATURES section of the official datasheet (Version M2104). The molding compound meets UL 94V-0 flammability rating, and terminals are matte tin-plated to ensure lead-free solder compatibility without compromising reliability or wetting performance.

How does the thermal resistance of the MBR2045CT compare to higher-voltage variants in the same family?

The MBR2045CT has a junction-to-case thermal resistance (R_θJC) of 1°C/W (typical), which is lower than the 2°C/W specified for MBR2090CT and above. This reflects optimized die attachment and thermal path design for the 35–45V subgroup. As a result, the MBR2045CT dissipates heat more effectively at 20A DC load - enabling smaller heatsinks or higher ambient operation compared to 100V+ versions like MBR20100CT, where R_θJC rises to 2°C/W.