Diodes Incorporated SBR20A120CT

Overview

SBR20A120CT from Diodes Incorporated is a 20A dual common-cathode Super Barrier Rectifier with 120V peak repetitive reverse voltage, 0.79V max forward voltage at 10A/25°C, and 0.1mA max reverse leakage at 120V/25°C. It serves as a high-efficiency rectifier or freewheel diode in DC-DC converters and AC-DC adapters operating under high-temperature conditions.

For engineers reviewing the SBR20A120CT datasheet, SBR20A120CT pinout, SBR20A120CT application, or SBR20A120CT equivalent, key selection criteria include low VF stability across temperature, rugged avalanche capability versus Schottky diodes, TO-220AB package thermal resistance (2°C/W junction-to-case), and compliance with RoHS, halogen-free, and antimony-free requirements.

Technical Context

This device integrates patented SBR® technology to deliver superior avalanche energy handling compared to standard Schottky rectifiers, enabling reliable operation under transient overvoltage stress. Its dual common-cathode configuration supports independent leg conduction with shared cathode termination.

Thermal performance is defined by R_θJC = 2°C/W (TO-220AB) and operating junction temperature range of –65°C to +175°C. Electrical behavior is characterized by stable IR < 20µA at 120V/125°C and VF drift < 0.14V from 25°C to 125°C at 10A.

Key Specifications

Pinout & Package

Package: TO-220AB - Molded plastic case with UL 94V-0 flammability rating, matte tin-plated copper leadframe, and isolated mounting tab (non-electrical). Weight: ~1.85 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SBRT20A120CT and SS20120CT, the SBR20A120CT delivers optimal balance of low V_F, low I_R at elevated temperature, and proven avalanche ruggedness-making it preferred for thermally constrained, high-reliability DC-DC and adapter designs where long-term stability matters.

Availability

SBR20A120CT is available at Aetrix Electronics and suitable for DC-DC converters, AC-DC adapters, and industrial power supplies requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.

Supply support for SBR20A120CT 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.

The SBR® Super Barrier Rectifier product line was developed to replace Schottky diodes in high-efficiency, high-temperature power conversion applications-delivering lower forward voltage, superior thermal stability, and enhanced avalanche ruggedness without compromising switching speed.

FAQ

What is the maximum continuous current rating per leg for SBR20A120CT?

The SBR20A120CT is rated for 10 A average forward current per leg at TA = +25°C with appropriate heatsinking. Derating is required above 25°C ambient, following the published current derating curve (Fig. 3), where usable current drops to ~5.5 A at +85°C ambient and ~3.5 A at +125°C ambient.

Is the metal tab electrically isolated in the TO-220AB package?

No-the metal tab in the TO-220AB package is electrically connected to the common cathode (Pin 2). It must be insulated from the heatsink if cathode potential differs from heatsink ground. For fully isolated mounting, the ITO-220AB variant (SBR20A120CTFP) provides 2000 V_AC isolation between terminals and heatsink.

How does SBR20A120CT differ from standard Schottky rectifiers in reliability?

Unlike standard Schottky diodes, the SBR20A120CT uses patented Super Barrier technology that significantly improves avalanche energy handling-reducing failure risk during unclamped inductive switching. Its reverse leakage remains stable up to +175°C junction temperature, avoiding thermal runaway common in Schottkys above +125°C.

Can SBR20A120CT be used in surface-mount designs?

No-it is only offered in through-hole TO-220AB and ITO-220AB packages. These require PCB mounting with leads inserted and soldered into plated-through holes. No surface-mount (SMD) variant exists for this part number; alternative SBR devices like SBR20A120CT-13 are available in D²PAK for SMT use.