Diodes Incorporated SBR3045CTB

Overview

SBR3045CTB from Diodes Incorporated is a 30A dual common-cathode Super Barrier Rectifier in TO263AB (D2PAK) package, rated for 45V peak repetitive reverse voltage and 150°C junction temperature. It delivers 0.70V forward voltage at 15A/25°C and 0.66V at 15A/125°C, with soft fast switching and AEC-Q101 qualification for automotive power conversion.

For engineers reviewing the SBR3045CTB datasheet, SBR3045CTB pinout, SBR3045CTB application, or SBR3045CTB equivalent, key selection criteria include forward voltage drop at high temperature, surge current capability (180A), thermal resistance (2°C/W per leg), and RoHS/Green compliance for under-hood DC-DC and alternator rectification designs.

Technical Context

This dual-element rectifier integrates two independent SBR® diodes sharing a common cathode terminal, enabling full-wave bridge configurations with reduced conduction loss versus standard Schottky or fast recovery diodes. Its patented barrier structure achieves low VF while maintaining high-temperature leakage stability up to 125°C.

The device operates with 2°C/W typical junction-to-case thermal resistance per leg and supports 150°C continuous junction temperature, making it suitable for high-power-density automotive and industrial SMPS where thermal management is constrained and reliability under thermal cycling is critical.

Key Specifications

Pinout & Package

Package: TO263AB (D2PAK), surface-mount, thermally enhanced plastic case with exposed copper tab for heatsinking. Dimensions per AP02002: 10.66 mm × 9.66 mm × 4.82 mm, weight ≈1.6 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual common-cathode super barrier rectifier applications.

Compared with VS-30CPH04-M3 and MBR3045CT, SBR3045CTB provides superior high-temperature leakage control, AEC-Q101 validation, and halogen-free compliance-critical for automotive and long-life industrial deployments where thermal reliability and regulatory alignment are mandatory.

Availability

SBR3045CTB is available at Aetrix Electronics and suitable for automotive alternator rectification, industrial DC-DC converter output stages, and on-board charger input circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SBR3045CTB 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 SBR® product line targets high-efficiency, high-reliability power conversion in automotive, industrial, and computing applications-specifically engineered to replace conventional Schottky and fast recovery diodes where low VF, soft switching, and thermal robustness are essential.

FAQ

What is the maximum continuous junction temperature for SBR3045CTB?

The SBR3045CTB is rated for a maximum continuous junction temperature of +150°C, validated per its AEC-Q101 qualification. This allows uninterrupted operation in under-hood environments and high-power-density industrial converters without thermal derating below rated current, provided the thermal design maintains RθJC ≤ 2°C/W per leg to the heatsink.

Is SBR3045CTB pin-compatible with standard TO263AB dual-diode rectifiers?

Yes-SBR3045CTB uses the industry-standard TO263AB (D2PAK) outline with identical mechanical dimensions and terminal layout (Anode–Cathode–Anode) as other dual common-cathode rectifiers like MBR3045CT and VS-30CPH04-M3. Pad layout per AP02001 applies directly; no PCB redesign is needed for drop-in replacement.

Does SBR3045CTB require a heatsink in typical 15A applications?

At 15A per leg and 25°C ambient, a heatsink is recommended to maintain TJ ≤ 150°C due to conduction loss (~10.5W total). With 2°C/W RθJC and typical RθCA of 15–25°C/W, a modest 25 mm × 25 mm copper pour or small extruded heatsink suffices-no forced air or thermal compound is mandatory for most automotive and industrial implementations.

How does SBR3045CTB's soft switching behavior impact EMI in high-frequency converters?

SBR3045CTB's soft reverse recovery minimizes di/dt-induced voltage spikes and ringing during turn-off, reducing broadband conducted and radiated EMI. In 200–500 kHz DC-DC converters, this allows smaller input filters and fewer ferrite beads compared to fast recovery diodes-verified by Diodes' application note AN-4001 using near-field EMI scans.