Diodes Incorporated SBR20A300CT

Overview

SBR20A300CT from Diodes Incorporated is a 300V, 20A dual common-cathode Super Barrier Rectifier in TO-220AB package, optimized for high-efficiency AC/DC and DC/DC power conversion. It delivers 0.92V max forward voltage at 10A/25°C, 100µA max reverse leakage at 300V/25°C, and 45ns reverse recovery time-enabling use as boost diodes in PFC stages and blocking diodes in industrial SMPS.

For engineers reviewing the SBR20A300CT datasheet, SBR20A300CT pinout, SBR20A300CT application, or SBR20A300CT equivalent, key selection criteria include its 300V VRRM rating, dual-leg 20A total IO capability, low VF stability up to +125°C, and compatibility with TO-220AB heatsink mounting in high-power rectification circuits.

Technical Context

This device implements patented Super Barrier Rectifier technology-replacing traditional PN junctions with engineered metal-semiconductor barriers to reduce forward conduction loss while maintaining robust reverse blocking. Its dual common-cathode configuration supports independent leg operation in center-tapped or interleaved topologies.

Thermal performance is defined by RθJC = 2°C/W (TO-220AB), enabling 10A per leg at TJ ≤ 175°C with proper heatsinking. Electrical behavior is characterized across temperature: VF rises only marginally from 0.70V (25°C) to 0.78V (125°C) at 10A, and IR increases from 0.1mA to 10mA over the same range.

Key Specifications

Pinout & Package

Package: TO-220AB, 3-terminal, through-hole, isolated tab (anode–cathode–anode), matte tin-plated copper leadframe, UL 94V-0 molded plastic body, 1.85g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR2030CT and STTH2003CT, SBR20A300CT delivers the lowest system-level power loss across 25–125°C ambient, combining best-in-class VF, moderate Trr, and stable IR-making it optimal for thermally constrained, high-efficiency 300V rectification where reliability trumps absolute lowest cost.

Availability

SBR20A300CT is available at Aetrix Electronics and suitable for server power supplies, industrial motor drives, solar microinverters, and medical imaging PSUs requiring stable component supply and long-term manufacturability.

Supply support for SBR20A300CT 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 the Americas.

This device belongs to Diodes' SBR (Super Barrier Rectifier) product line-engineered specifically to replace Schottky and fast recovery diodes in 10–100A, 45–300V power conversion applications where low VF, high-temperature stability, and low EMI are critical.

FAQ

What is the maximum junction temperature and how does it affect derating?

The SBR20A300CT has a rated TJ range of −65°C to +175°C. At TA = 25°C with a 50mm × 50mm heatsink, it supports 10A per leg continuously. Derating begins linearly above 25°C ambient: current drops to ~6.5A/leg at 100°C ambient and 0A at 175°C, per Fig. 4 in DS30993 Rev. 10-2.

Is the TO-220AB package electrically isolated between pins and tab?

No-the center pin and metal tab are internally connected to the common cathode and are electrically identical. Pins 1 and 3 (anodes) are isolated from each other and from the tab. Mounting requires insulating hardware if the heatsink is grounded or at non-cathode potential.

How does SBR20A300CT compare to standard Schottky rectifiers at 300V?

Standard Schottky diodes are unavailable above ~200V due to inherent barrier height limitations. SBR20A300CT achieves 300V VRRM using a patented super barrier structure-delivering Schottky-like VF (0.92V) with PN-diode-level leakage control and ruggedness, unlike fragile high-voltage Schottkys which suffer premature failure above 200V.

Can SBR20A300CT be used in place of single-die 20A rectifiers like SBR20A300T?

No-SBR20A300T is a single-anode device, while SBR20A300CT is dual-anode common-cathode. Substitution requires verifying circuit topology: CT variants enable center-tapped transformer outputs or dual-input redundancy; replacing with a single-anode part would require rewiring and may compromise functionality or safety isolation.