Diodes Incorporated SBR1040CTB

Overview

SBR1040CTB from Diodes Incorporated is a dual common-cathode 10A super barrier rectifier optimized for low-loss DC/DC conversion in high-efficiency power supplies, with 40V reverse voltage rating, 0.53V typical forward voltage at 5A, and soft fast switching behavior. It replaces Schottky diodes in 5–12V output rails where thermal stability and surge robustness are critical.

For engineers reviewing the SBR1040CTB datasheet, SBR1040CTB pinout, SBR1040CTB application, or SBR1040CTB equivalent, key selection criteria include its 6°C/W junction-to-case thermal resistance, 85A non-repetitive surge rating, -65°C to +175°C operating range, and D2PAK (TO-263) package compatibility with high-current PCB layouts.

Technical Context

This dual-leg rectifier integrates two independent 5A-rated super barrier diodes sharing a common cathode terminal, enabling synchronous half-wave or center-tapped transformer secondary rectification. Its patented super barrier structure delivers lower forward voltage than standard Schottkys while maintaining superior high-temperature leakage performance.

The device operates with soft recovery characteristics-minimizing EMI in switching converters-and supports full 10A total average current when both legs are paralleled in single-output configurations. Thermal derating follows a defined curve: 10A at 25°C ambient, linearly reduced to ~4.5A at 100°C ambient per leg.

Key Specifications

Pinout & Package

Package: D2PAK (TO-263), surface-mount with exposed copper thermal pad. Molded plastic case meets UL 94V-0; terminals feature matte tin over copper leadframe, solderable per MIL-STD-202.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SBRT1040CTB, SBR1040CTB trades 15A surge margin for broader commercial availability and lower unit cost; versus MBR1045CT, it delivers measurable efficiency and thermal stability gains in thermally constrained or high-reliability applications.

Availability

SBR1040CTB is available at Aetrix Electronics and suitable for server VRM output stages, automotive infotainment power supplies, and industrial PLC I/O modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for SBR1040CTB 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 centers across Asia and manufacturing in China, Taiwan, and the U.S.

The SBR® Super Barrier Rectifier product line targets high-efficiency, high-reliability power conversion in computing, automotive, and industrial applications where traditional Schottky limitations in leakage and temperature stability are unacceptable.

FAQ

What is the thermal pad connection requirement for SBR1040CTB?

The exposed D2PAK tab is internally connected to the cathode (K) and must be soldered to a minimum 100 mm² copper thermal pad on the PCB, using at least 9 solder paste vias (0.3mm diameter) to inner ground plane. This achieves the specified 6°C/W RθJC and prevents thermal saturation above 4A continuous per leg.

Can SBR1040CTB be used in parallel with another unit for 20A output?

No-SBR1040CTB is not characterized for parallel operation. Its VF mismatch between units (±0.03V) causes current imbalance exceeding 25% at 10A per device. For >10A, use a single higher-current part like SBR2040CT or implement active current-sharing circuitry.

Does SBR1040CTB require a snubber circuit in 500kHz boost converters?

No snubber is required due to its soft recovery characteristic. Measured reverse recovery time is <35ns with <10% voltage overshoot into 100nH stray inductance, verified per Figure 2 in DS31552 Rev. 5-2. Snubbers may be omitted unless layout inductance exceeds 200nH.

Is the green molding compound version functionally identical to SBR1040CTB?

Yes-SBR1040CTB-G uses halogen-free epoxy with identical electrical, thermal, and mechanical specifications. The "-G" suffix denotes compliance with IPC-1752a Class 2 material declarations; no derating or layout changes are needed when substituting.