Fairchild Semiconductor MBR4060PT

Overview

MBR4060PT from Diodes Incorporated is a 40A, 60V 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 MBR4060PT datasheet, MBR4060PT pinout, MBR4060PT application, or MBR4060PT equivalent, key selection criteria include peak reverse voltage (60 V), average output current (40 A @ TC = 125°C), forward voltage at operating temperature, thermal resistance, and TO-3P mechanical compatibility with heatsink mounting.

Technical Context

This discrete Schottky rectifier uses guard-ring die construction to suppress transient-induced failure and supports single-phase, half-wave rectification at 60 Hz under resistive/inductive loads. Its 1100 pF junction capacitance and 10,000 V/s dV/dt rating enable stable operation in high-frequency switching environments.

The device operates across –65°C to +150°C and requires derating to 32 A for capacitive loads. Thermal performance is defined with heatsink mounting per Note 1, and its bright tin-plated leads comply with MIL-STD-202 solderability requirements.

Key Specifications

Pinout & Package

TO-3P package: insulated plastic case (UL 94V-0), 3-terminal configuration with anode, cathode, and case-connected tab (cathode). Mounting via center screw hole; tab serves as cathode terminal and thermal path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPH06 and MBR4060CT, the MBR4060PT offers superior thermal performance (1.4 °C/W) and lower forward drop in a TO-3P package optimized for high-current single-path rectification - making it preferable for space-constrained, heatsink-mounted industrial power stages.

Availability

MBR4060PT is available at Aetrix Electronics and suitable for industrial DC power supplies, solar charge controllers, motor drive freewheeling, and inductive load switching requiring stable component supply despite its obsolete status.

Supply support for MBR4060PT 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, specializing in high-efficiency power management and signal integrity solutions.

The MBR4060PT belongs to the MBR40xxPT Schottky rectifier product line, engineered for high-current, low-loss rectification in industrial and renewable energy systems where thermal performance and surge resilience are critical.

FAQ

Is MBR4060PT still in production?

No - Diodes Incorporated has discontinued the MBR4060PT (marked "OBSOLETE – PART DISCONTINUED" in DS23019 Rev. 9-4, July 2015). Aetrix Electronics provides last-time-buy inventory with full traceability and supports design migration to validated alternatives such as VS-40CPH06 or MBR4060CT where functionally appropriate.

What is the correct mounting orientation for TO-3P thermal performance?

The TO-3P case tab (cathode) must be mounted directly to a flat, clean, thermally conductive heatsink using a torque-controlled screw and optional mica or silicone pad for electrical isolation. Per datasheet Note 1, RJC = 1.4 °C/W assumes full-case contact and proper thermal interface material - misalignment or insufficient clamping increases junction temperature by >15°C at 40 A.

Can MBR4060PT replace MBR4050PT in existing designs?

Yes - the MBR4060PT shares identical TO-3P package, pinout, and thermal characteristics with the MBR4050PT, differing only in VRRM (60 V vs. 50 V) and VR(RMS) (42 V vs. 35 V). It provides additional reverse voltage margin without layout or thermal redesign, provided system peak reverse voltage remains ≤60 V.

Why does the datasheet specify 20% current derating for capacitive loads?

Capacitive input filters cause high inrush current at turn-on, increasing peak forward current beyond steady-state ratings. The 20% derating (to 32 A) ensures IFSM margin is preserved and prevents junction overheating during repeated cold starts - verified per JEDEC test conditions in DS23019.