Taiwan Semiconductor Corporation MBR790

Overview

MBR790 from Taiwan Semiconductor is a 7.5A, 90V Schottky barrier rectifier in TO-220AC package, designed for high-efficiency DC/DC conversion and SMPS output stages. It delivers 0.92V forward voltage at 7.5A and 25°C, supports 150A non-repetitive surge current, operates up to 150°C junction temperature, and features guard ring overvoltage protection.

For engineers reviewing the MBR790 datasheet, MBR790 pinout, MBR790 application, or MBR790 equivalent, key selection criteria include its 90V V_RRM, low VF at high IF, thermal resistance (R_θJC = 5°C/W), AEC-Q101 qualification option (MBR790H), and TO-220AC mechanical compatibility with standard heatsink mounting.

Technical Context

The MBR790 is a single-die, unidirectional Schottky rectifier optimized for high-frequency switching applications where low conduction loss and fast recovery are critical. Its 90V repetitive peak reverse voltage and 5mA reverse leakage at 125°C enable reliable operation in 48V–72V bus-derived power rails.

Thermally, it uses a TO-220AC case with 5°C/W junction-to-case resistance and 15°C/W junction-to-ambient rating, requiring external heatsinking for sustained 7.5A operation. The guard ring structure enhances ruggedness against transient overvoltage events without external snubbers.

Key Specifications

Pinout & Package

Package: TO-220AC - Three-terminal, through-hole molded plastic case with isolated tab (cathode-connected tab), matte tin-plated leads, UL 94V-0 rated 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-75SQ030 and MBR790G, the MBR790 provides optimal balance of 90V blocking, 7.5A rating, low 0.92V forward drop, and AEC-Q101 availability - making it uniquely suited for 48V automotive and industrial DC/DC converters requiring proven thermal and surge performance in TO-220AC.

Availability

MBR790 is available at Aetrix Electronics and suitable for server power supplies, automotive DC/DC converters, and industrial PLC power modules requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for MBR790 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 automotive markets since 1979.

The MBR7xx series was developed specifically for high-efficiency, high-reliability output rectification in medium-power SMPS, emphasizing ruggedness, thermal performance, and qualification-readiness for automotive and harsh-environment applications.

FAQ

What is the maximum junction temperature rating for the MBR790?

The MBR790 has a maximum junction temperature (T_J) rating of +150°C. This allows continuous operation in high-ambient environments such as under-hood automotive locations or enclosed industrial power supplies. Derating curves in the official datasheet specify usable current versus case temperature, and thermal design must ensure R_θJA ≤ 15°C/W with appropriate heatsinking to maintain safe operation at full 7.5A load. The MBR790's 150°C rating exceeds standard commercial-grade diodes.

Is the MBR790 pin-compatible with other parts in the MBR7xx family?

Yes - all MBR7xx devices including MBR790 use identical TO-220AC packaging and pinout: Anode (lead 1), Cathode (lead 2), and electrically connected cathode tab. Voltage variants (e.g., MBR750, MBR7100) share mechanical and thermal footprints, enabling direct replacement in existing layouts when voltage and VF requirements align. However, forward voltage and leakage differ across variants, so electrical validation is required before substitution. The MBR790 itself maintains consistent pin assignment across all production lots.

Does the MBR790 have AEC-Q101 qualification?

The base MBR790 is not AEC-Q101 qualified, but the MBR790H variant is explicitly qualified per AEC-Q101. The "H" suffix denotes automotive-grade screening including stress testing for temperature cycling, humidity, and mechanical shock. Datasheet Version K2103 confirms MBR790H availability. For automotive applications requiring qualification evidence, MBR790H must be specified - the MBR790 alone does not carry this certification, and no derivative or undocumented qualification applies to the non-H part number.

What is the typical forward voltage of the MBR790 at 7.5A and 125°C?

The typical forward voltage of the MBR790 at 7.5A and 125°C is 0.82V, as specified in the Electrical Specifications table of the official datasheet (Version K2103). This value reflects reduced voltage drop at elevated temperature due to Schottky physics and is critical for thermal stability analysis. At room temperature (25°C), V_F is 0.92V under the same conditions. Both values are measured with pulse testing (PW = 0.3ms) to avoid self-heating artifacts. The MBR790's V_F remains stable across its full operating temperature range.

How is thermal management handled for the MBR790 in high-current operation?

The MBR790 relies on its TO-220AC metal tab for primary heat dissipation, with a specified R_θJC of 5°C/W. Effective thermal management requires mounting the tab to a heatsink using thermal interface material and applying ≤0.56 N·m torque to the mounting screw. Without heatsinking, R_θJA is 15°C/W - limiting continuous current to ~2.5A at 25°C ambient. For full 7.5A operation, a heatsink maintaining T_C ≤ 100°C is mandatory. The MBR790's thermal design is validated in Taiwan Semiconductor's application notes for SMPS output stages.