Diodes Incorporated SBR30120CT

Overview

SBR30120CT from Diodes Incorporated is a 30A dual common-cathode super barrier rectifier in TO-220AB package, rated for 120V peak repetitive reverse voltage, with typical forward voltage of 0.80V at 15A and 25°C, and thermal resistance of 3°C/W per leg-used in high-efficiency AC/DC front-end rectification for industrial power supplies.

For engineers reviewing the SBR30120CT datasheet, SBR30120CT pinout, SBR30120CT application, or SBR30120CT equivalent, key selection criteria include forward voltage drop at elevated temperature (0.73–0.89V across 25–125°C), leakage current stability (≤100µA at 125°C), surge capability (180A IFSM), and thermal performance under forced-air or heatsink-cooled operation.

Technical Context

This dual-leg rectifier integrates two independent super barrier diodes sharing a common cathode terminal, enabling full-wave center-tapped or dual-output configurations. Its patented SBR technology delivers lower VF than standard Schottky diodes while maintaining superior high-temperature leakage performance compared to conventional fast recovery diodes.

The device operates across –65°C to +175°C junction temperature range and is optimized for switching frequencies up to 100 kHz in offline SMPS, PFC stages, and DC-DC secondary-side rectification where soft recovery minimizes EMI and reduces snubber losses.

Key Specifications

Pinout & Package

TO-220AB package: 3-terminal molded plastic case with isolated mounting tab (cathode-connected), UL 94V-0 rated, matte tin-plated copper leadframe, 1.85g weight. Mounting tab is electrically connected to cathode (Pin 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-30CPH12, SBR30120CT offers smaller TO-220AB footprint and RoHS/Green compliance but trades 0.5°C/W higher thermal resistance; versus MUR30120CT, it delivers 38% lower conduction loss and 5× lower high-temp leakage-making it superior for efficiency-critical, thermally constrained designs.

Availability

SBR30120CT is available at Aetrix Electronics and suitable for industrial motor drives, solar microinverters, medical diagnostic power supplies, and server PSUs requiring stable component supply with full traceability and long-lifecycle support.

Supply support for SBR30120CT 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, serving industrial, computing, communications, and consumer markets with high-reliability components.

The SBR® product line was developed to replace Schottky and fast recovery diodes in high-current, medium-voltage rectification-delivering lower VF than FRDs and better high-temperature leakage than Schottkys for 48–200V applications.

FAQ

Is the metal tab on SBR30120CT electrically isolated?

No-the metal tab is internally connected to Pin 2 (common cathode). When mounted to a heatsink, ensure electrical isolation via mica washer or silicone pad unless the heatsink is referenced to cathode potential. This connection is confirmed in the TO-220AB mechanical drawing and pinout diagram in DS31868 Rev. 2–2.

What is the maximum recommended ambient temperature for continuous 30A operation?

Continuous 30A total (15A per leg) is only rated with adequate heatsinking-specifically a black aluminum heatsink (37mm × 50mm × 15mm) per Note 7. Under those conditions, Fig. 4 shows derating begins above 40°C ambient; full 15A/leg is supported up to 60°C ambient with that heatsink.

Can SBR30120CT replace a standard 30A bridge rectifier?

No-it is a dual common-cathode diode, not a full bridge. It replaces two separate diodes in center-tapped transformer or dual-output configurations. To substitute for a 4-pin bridge, external wiring would be required, compromising layout integrity and thermal performance; dedicated bridge alternatives like GBU3012 should be used instead.

Does SBR30120CT require a snubber circuit in 100 kHz LLC applications?

Typically no-its soft, fast switching characteristic (documented in Fig. 2 and application notes DS31868) suppresses reverse recovery spikes and ringing. Measured waveforms in Diodes' reference designs show <5V overshoot at 100 kHz with no snubber; however, layout-dependent parasitics may necessitate minimal RC damping in edge-case layouts.