Diodes Incorporated SBR30A120CT

Overview

SBR30A120CT from Diodes Incorporated is a 30A dual common-cathode super barrier rectifier in TO-220AB package, rated for 120V peak repetitive reverse voltage, 15A average current per leg (30A total), and 250A non-repetitive surge current; it delivers 0.78V forward voltage at 15A/25°C and operates up to 175°C junction temperature, used in high-efficiency AC/DC front-end rectification for industrial power supplies.

For engineers reviewing the SBR30A120CT datasheet, SBR30A120CT pinout, SBR30A120CT application, or SBR30A120CT equivalent, key selection criteria include forward voltage drop at high temperature, thermal resistance (2°C/W junction-to-case), soft switching behavior, RoHS-compliant lead-free finish, and dual-anode/common-cathode configuration for center-tapped transformer designs.

Technical Context

This device implements patented Super Barrier Rectifier (SBR®) technology-distinct from Schottky and standard PN diodes-achieving lower VF than fast recovery diodes while maintaining higher reverse voltage capability and superior high-temperature leakage stability. Its dual-anode/common-cathode topology enables synchronous half-wave rectification in center-tapped secondary circuits.

Thermal design is critical: with RθJC = 2°C/W (TO-220AB), it supports high-power density layouts when mounted on heatsinks; leakage remains ≤22μA at 120V/25°C and ≤5mA at 120V/125°C, enabling reliable operation in thermally constrained environments without forced air cooling.

Key Specifications

Pinout & Package

Package: TO-220AB - Molded plastic case with UL 94V-0 flammability rating, matte tin-plated copper leadframe, 1.85g weight, and isolated tab (electrically connected to cathode) requiring insulating washer when mounted to grounded heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS30H120CG and VS-30CPH12, SBR30A120CT uniquely balances low VF, soft switching, and 120V optimization-delivering best-in-class efficiency and EMI performance for 100–120V rectification without over-engineering voltage rating or sacrificing thermal headroom.

Availability

SBR30A120CT is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, server PSUs, motor drive DC bus protection, and renewable energy inverter stages requiring stable component supply, long lifecycle support, and RoHS-compliant manufacturing.

Supply support for SBR30A120CT 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 automotive, industrial, computing, and consumer markets with a focus on power efficiency and reliability.

SBR30A120CT belongs to the SBR® Super Barrier Rectifier product line, engineered specifically for high-current, medium-voltage rectification where Schottky VF is needed but standard Schottky VRRM limits are insufficient-targeting 80 PLUS Titanium PSUs and compact industrial power systems.

FAQ

Is SBR30A120CT pin-compatible with standard TO-220AB dual-diode packages?

Yes-SBR30A120CT uses industry-standard TO-220AB mechanical outline with 3-pin single-row configuration (Anode1–Cathode–Anode2), matching footprint and hole spacing of equivalents like STPS30H120CG and MUR30120CT. Mounting hole centers are 2.54mm apart, and tab dimensions comply with JEDEC TO-220AB spec.

What is the maximum continuous current per anode leg at 100°C ambient?

At TA = 100°C with proper heatsinking (RθJA ≤ 10°C/W), the device supports 15A per leg continuously. Derating curves in DS31094 show IO drops to ~11.5A per leg at 100°C ambient with TO-220AB on 1-in² 2oz copper pad, due to combined RθJC (2°C/W) and RθCS + RθSA thermal path limitations.

Does the cathode tab require electrical isolation from the heatsink?

Yes-the cathode is internally bonded to the metal tab, so mounting to a grounded heatsink creates a short unless an insulating washer and shoulder washer are used. For isolated mounting, Diodes Inc. recommends mica or polymer film isolators with thermal grease; minimum creepage distance is 4.0mm per IEC 62368-1.

How does SBR30A120CT's soft switching reduce EMI compared to fast recovery diodes?

Its patented SBR structure eliminates abrupt reverse recovery current (IRR) and associated dv/dt-induced ringing. Measured oscilloscope waveforms in DS31094 show <5ns reverse recovery time and no tail current-reducing high-frequency spectral content above 30MHz by 12dB and allowing smaller EMI filters in Class B conducted emissions testing.