Diodes Incorporated SBR20A40CT

Overview

SBR20A40CT from Diodes Incorporated is a 20A, 40V dual common-cathode super barrier rectifier in TO-220AB package, engineered for high-efficiency AC/DC and DC/DC power conversion. It delivers VF = 0.47 V at 20A/25°C, exhibits IFSM = 180 A surge capability, and maintains stable leakage (IR ≤ 100 µA at 40V/125°C), making it suitable for high-density switch-mode power supplies in industrial and telecom infrastructure.

For engineers reviewing the SBR20A40CT datasheet, SBR20A40CT pinout, SBR20A40CT application, or SBR20A40CT equivalent, key selection criteria include forward voltage optimization at high current, thermal resistance (RθJC = 2°C/W), soft-switching behavior for EMI reduction, and RoHS-compliant green molding compound compatibility with lead-free reflow profiles.

Technical Context

This dual-element rectifier integrates two independent super barrier diodes sharing a common cathode terminal, enabling synchronous half-wave or center-tapped full-wave configurations. Its patented super barrier structure replaces traditional PN junctions with low-barrier metal-semiconductor interfaces, achieving lower VF than Schottky diodes while retaining higher reverse blocking stability.

The device operates across –65°C to +150°C junction temperature range and supports continuous average forward current up to 20A at TC = 110°C. Thermal derating follows a linear curve down to zero current at 150°C case temperature, validated per MIL-STD-202 solderability testing on matte tin–plated copper leads.

Key Specifications

Pinout & Package

TO-220AB package with insulated tab; pin 1 = Anode 1, pin 2 = Cathode (common), pin 3 = Anode 2. Tab is electrically isolated and thermally connected to cathode node.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current, low-VF rectifier applications.

Compared with VS-20CPH04 and MUR2040CT, SBR20A40CT uniquely balances ultra-low VF, soft switching, and TO-220AB thermal performance - delivering highest efficiency in space-constrained 40 V systems where thermal management is prioritized over voltage headroom or EMI robustness.

Availability

SBR20A40CT is available at Aetrix Electronics and suitable for server power supplies, industrial motor drives, telecom rectifier modules, and LED streetlight drivers requiring stable component supply and long-term manufacturing continuity.

Supply support for SBR20A40CT 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 Europe, serving industrial, computing, and communications markets.

SBR20A40CT belongs to the SBR® Super Barrier Rectifier product line, developed specifically to replace Schottky diodes in high-current, high-temperature power conversion where low VF and thermal stability are critical.

FAQ

Is SBR20A40CT pin-compatible with standard TO-220AB dual-diode rectifiers like MUR2040CT?

Yes - SBR20A40CT uses identical TO-220AB mechanical outline and 3-pin pinout (A-K-K). Pin 1 is Anode 1, Pin 2 is Common Cathode, Pin 3 is Anode 2. No PCB redesign is needed for drop-in replacement, though thermal and electrical performance improvements may require minor layout optimization for heatsinking.

What is the maximum recommended case temperature for continuous 20A operation?

The datasheet specifies IO = 20 A only at TC = 110°C. Operation at 20A above 110°C violates derating curves - at TC = 125°C, max IO drops to 15.5 A; at TC = 150°C, it falls to zero. For sustained 20A use, heatsink design must ensure TC ≤ 110°C under worst-case ambient and airflow conditions.

Does SBR20A40CT require a minimum reverse voltage to achieve specified leakage performance?

No - IR is characterized at VR = 40 V, but leakage remains within spec (≤100 µA at 125°C) across the full 0–40 V reverse bias range. The device shows no voltage-dependent leakage knee up to rated VRRM, unlike some Schottky diodes that exhibit exponential IR increase near breakdown.

Can SBR20A40CT be used in surface-mount applications?

No - SBR20A40CT is through-hole only (TO-220AB). Diodes Incorporated offers SBR20A40CTFP in ITO-220AB for surface-mount assembly, which shares identical electrical specs but features isolated tab and modified leadform for reflow soldering. Standard SBR20A40CT must be wave-soldered or hand-soldered.