Taiwan Semiconductor Corporation MBR1645

Overview

MBR1645 from Taiwan Semiconductor is a 16A, 45V Schottky barrier rectifier in TO-220AC package, featuring low forward voltage (0.63 V at 16 A, 25°C), high surge current capability (150 A), and AEC-Q101 qualification option. It serves as a primary output rectifier in high-efficiency DC/DC converters and AC/DC adapters.

For engineers reviewing the MBR1645 datasheet, MBR1645 pinout, MBR1645 application, or MBR1645 equivalent, key selection criteria include its 45 V repetitive peak reverse voltage, 3 °C/W junction-to-case thermal resistance, 150 °C maximum junction temperature, and compatibility with lead-free reflow soldering per J-STD-002.

Technical Context

This single-die Schottky rectifier operates with minimal conduction loss due to its low VF and lacks reverse recovery charge, eliminating switching losses in high-frequency SMPS topologies. Its guard ring structure provides robust overvoltage protection, and it sustains 150 A non-repetitive surge current under 8.3 ms half-sine conditions.

The device is rated for continuous operation from –55 °C to +150 °C junction temperature, with thermal performance validated by a typical R_θJC of 3 °C/W. Reverse leakage remains ≤500 µA at 25 °C and ≤15 mA at 125 °C under rated 45 V reverse bias.

Key Specifications

Pinout & Package

Package: TO-220AC - Insulated case with matte tin-plated leads, UL 94V-0 molding compound, and polarity marking. 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 MBR1645, VS-MBR1645CT-M3/45 offers dual-diode functionality at the cost of layout incompatibility, while MBR1645G delivers guaranteed AEC-Q101 qualification without requiring an 'H' suffix-making it preferable for automotive programs needing audit-ready documentation.

Availability

MBR1645 is available at Aetrix Electronics and suitable for switching mode power supplies, DC/DC converters, and AC adapters requiring stable component supply with consistent parametric performance across production lots.

Supply support for MBR1645 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 discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and consumer markets since 1979.

The MBR16xx series belongs to TSC's high-current Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in space-constrained and thermally demanding applications.

FAQ

What is the maximum junction temperature rating for MBR1645?

The MBR1645 has a maximum junction temperature (T_J) rating of +150 °C, validated across its full operating range from –55 °C to +150 °C. This allows reliable use in sealed enclosures or high-ambient environments such as industrial motor drives and automotive under-hood auxiliary supplies. The MBR1645 maintains specified electrical parameters-including forward voltage and reverse leakage-within this full range, provided thermal design respects the 3 °C/W junction-to-case resistance.

Does MBR1645 have AEC-Q101 qualification?

The base MBR1645 is not AEC-Q101 qualified; however, the variant MBR1645H is explicitly qualified per AEC-Q101 Rev D. This qualification includes stress testing for temperature cycling, humidity bias, and mechanical shock. For automotive applications requiring formal qualification evidence, MBR1645H must be specified-its electrical and thermal specs are identical to MBR1645, with qualification being the sole differentiating factor.

What is the forward voltage of MBR1645 at 125°C and full rated current?

At 16 A forward current and 125 °C junction temperature, the MBR1645 exhibits a typical forward voltage (V_F) of 0.57 V, with no maximum specified in the datasheet. This reduction from 0.63 V at 25 °C reflects the negative temperature coefficient of Schottky diodes and supports stable performance in thermally saturated designs. The MBR1645 maintains this low V_F behavior across its entire 16 A DC load range at elevated temperatures.

Can MBR1645 be mounted directly to a heatsink without electrical isolation?

No-MBR1645 uses a TO-220AC package where the metal tab is electrically connected to the anode. Direct mounting to a grounded heatsink creates a short circuit unless an insulating pad or shoulder washer is used. The MBR1645 datasheet specifies that the tab is the anode terminal, and polarity marking on the device confirms this. Always verify isolation requirements in the target PCB layout before thermal interface selection.

What is the reverse leakage current of MBR1645 at 45 V and 125°C?

At 45 V reverse voltage and 125 °C junction temperature, the MBR1645 has a maximum reverse leakage current (I_R) of 15 mA, as specified in the Electrical Specifications table. This value is measured under pulsed conditions (PW = 30 ms) and represents worst-case behavior under thermal stress. At 25 °C, leakage is limited to 500 µA, confirming strong temperature-dependent stability critical for high-temperature power supply hold-up and standby modes.