onsemi MBR4035PT

Overview

MBR4035PT from Diodes Incorporated is a 40A, 35V Schottky barrier rectifier in TO-3P package, featuring low forward voltage drop (0.70 V @ 20A, 25°C), high surge capability (400 A), and thermal resistance of 1.4 °C/W - used for polarity protection and free-wheeling in DC-DC converters and industrial power supplies.

For engineers reviewing the MBR4035PT datasheet, MBR4035PT pinout, MBR4035PT application, or MBR4035PT equivalent, key selection criteria include its 35 V blocking rating, 40 A average output current at 125°C case temperature, 0.60 V forward drop at elevated temperature, and TO-3P mechanical compatibility with heatsink mounting.

Technical Context

This device employs Schottky barrier chip guard ring die construction to enhance transient immunity and reduce reverse recovery losses. Its low forward voltage and high surge rating support efficient operation in high-frequency switching topologies where conduction loss minimization is critical.

Designed for single-phase, half-wave rectification under resistive or inductive loads at 60 Hz, it requires 20% current derating for capacitive loads. Thermal performance relies on heatsink mounting, as specified by junction-to-case resistance of 1.4 °C/W.

Key Specifications

Pinout & Package

TO-3P package: insulated plastic case with three leads - anode, cathode, and case-connected tab (cathode common). Mounting hole centered on tab enables mechanical fixation and thermal coupling to heatsink.

Key Features

Applications

Availability

MBR4035PT is available at Aetrix Electronics and suitable for industrial power supplies, DC-DC converter output stages, and polarity protection circuits requiring stable component supply despite end-of-life status.

Supply support for MBR4035PT 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The MBR40xxPT series belongs to Diodes' high-current Schottky rectifier product line, engineered for low-loss, high-efficiency power conversion in space-constrained industrial and telecom power systems.

FAQ

Is MBR4035PT still in active production?

No - MBR4035PT is officially obsolete and discontinued per Diodes Incorporated's DS23019 Rev. 9 (July 2015). It remains available through authorized distributors' legacy stock and Aetrix Electronics' extended lifecycle inventory program with full traceability.

What is the pin configuration for TO-3P package?

The TO-3P package has three terminals: Lead 1 (anode), Lead 2 (cathode), and the metal tab (cathode-connected). The tab serves as both electrical cathode and primary thermal path to heatsink, requiring insulating hardware if mounted to grounded surfaces.

How does MBR4035PT compare to MBR4040PT in thermal performance?

Both share identical TO-3P packaging and RJC = 1.4 °C/W, but MBR4035PT's lower VRRM (35 V vs. 40 V) allows slightly reduced forward voltage at same current - resulting in ~0.02 V lower VFM at 20 A/25°C, improving efficiency in 24 V systems.

Can MBR4035PT be used in place of MBR2035CT?

No - MBR2035CT is a dual-common-cathode 20 A device in TO-220AB package, while MBR4035PT is a single 40 A device in TO-3P. Differences in current rating, package thermal mass, and pinout make direct substitution unsafe without board-level redesign and thermal validation.