SMC Diode Solutions MBR1535CT

Overview

MBR1535CT from Diodes Incorporated is a 15A dual common-cathode Schottky barrier rectifier in TO220AB package, rated for 35V peak repetitive reverse voltage, with maximum forward voltage drop of 0.78V at 15A and 25°C, and maximum reverse leakage current of 0.05mA at 25°C. It serves as a low-loss freewheeling or polarity protection diode in DC-DC converters and industrial power supplies.

For engineers reviewing the MBR1535CT datasheet, MBR1535CT pinout, MBR1535CT application, or MBR1535CT equivalent, key selection criteria include its 35V VRRM rating, 15A average output current capability, TO220AB thermal resistance (1.7°C/W), dual common-cathode configuration, and AEC-Q101 qualification for reliability-critical power stages.

Technical Context

This dual Schottky rectifier integrates two independent anode terminals sharing one cathode, enabling synchronous half-bridge or dual-output rectification without external parallel wiring. Its guard ring die construction suppresses transient-induced avalanche breakdown, while low junction capacitance (≈250pF at 4V) supports high-frequency switching up to 100kHz.

The device operates across –65°C to +150°C junction temperature range and delivers stable forward conduction under pulsed surge conditions (150A IFSM, 8.3ms half-sine), making it suitable for inductive load commutation in motor drives and SMPS secondary-side rectification.

Key Specifications

Pinout & Package

Package: TO220AB - Molded plastic case with tin-plated terminals, UL 94V-0 flammability rating, moisture sensitivity level 1, and 2.24g mass. Mounting requires mechanical fastener and thermal interface material for optimal heat transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MBR1545CT, the MBR1535CT offers lower forward voltage and leakage for 24V systems but reduced voltage margin; versus SB1530, it provides integrated dual-anode functionality at the cost of slightly higher VF, eliminating layout complexity and interconnect losses.

Availability

MBR1535CT is available at Aetrix Electronics and suitable for industrial motor drives, telecom DC-DC converters, and redundant power supplies requiring stable component supply, long-term lifecycle support, and AEC-Q101 qualified reliability.

Supply support for MBR1535CT 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, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The MBR1535CT belongs to Diodes' high-current Schottky rectifier product line, engineered for low-loss power conversion in commercial and automotive-grade power supplies where efficiency, surge resilience, and thermal performance are critical.

FAQ

What is the maximum junction temperature for continuous operation of MBR1535CT?

The MBR1535CT has a specified operating junction temperature range of –65°C to +150°C. For reliable continuous operation at full 15A current, thermal design must ensure TJ remains ≤+150°C, typically achieved with a heatsink providing ≤1.7°C/W total thermal resistance from junction to ambient.

Is MBR1535CT pin-compatible with MBR1545CT or MBR1560CT?

Yes - all three share identical TO220AB package outline, pin assignment (Anode–Cathode–Anode), and mechanical footprint. The only differences are electrical ratings: VRRM (35V vs. 45V/60V), VF, and IR. No PCB redesign is needed when upgrading within this family for voltage margin adjustments.

Does MBR1535CT require a heatsink in 15A applications?

Yes - at 15A continuous current and 25°C ambient, conduction loss alone generates ~11.7W per leg. Without a heatsink, junction temperature would exceed 150°C within seconds. A heatsink with ≤1.7°C/W thermal resistance (including interface material) is mandatory for sustained operation.

How does the guard ring construction improve reliability in MBR1535CT?

The guard ring structure surrounds the active junction to distribute electric field stress during voltage transients, preventing localized avalanche breakdown. This extends device lifetime under repetitive surge conditions (e.g., IEC 61000-4-4/5) and eliminates need for external clamping components in many industrial power designs.