Diodes Incorporated SBR30A45CT

Overview

SBR30A45CT from Diodes Incorporated is a 30A dual common-cathode super barrier rectifier in TO-220AB package, rated for 45V peak reverse voltage, with typical forward voltage of 0.45V at 15A and 125°C, and 250A non-repetitive surge current capability. It serves as a high-efficiency output rectifier in AC/DC power supplies and DC/DC converters for industrial and telecom power systems.

For engineers reviewing the SBR30A45CT datasheet, SBR30A45CT pinout, SBR30A45CT application, or SBR30A45CT equivalent, key selection criteria include forward voltage drop at high junction temperature, thermal resistance (R_θJC = 2°C/W), soft switching behavior, and RoHS-compliant lead-free construction with UL 94V-0 molding compound.

Technical Context

This dual-diode rectifier integrates two independent super barrier rectifier dies in a single TO-220AB thermally optimized package with common cathode configuration. Its patented SBR technology enables lower VF than Schottky diodes while maintaining higher VRRM and superior high-temperature leakage stability.

The device operates across –65°C to +150°C junction range, supports 2000V isolation (ITO variant only), and delivers soft recovery with minimal reverse recovery charge-critical for reducing EMI in high-frequency switching topologies like LLC resonant converters.

Key Specifications

Pinout & Package

TO-220AB package with isolated tab (electrically connected to cathode), 3-terminal configuration: Pin 1 (Anode 1), Pin 2 (Cathode), Pin 3 (Anode 2). Mounting tab serves as thermal path and electrical connection to cathode node.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS30H45CG and MBR3045CT, SBR30A45CT delivers the lowest VF at high temperature and lowest IR across its full operating range-making it optimal for thermally constrained, high-efficiency industrial and telecom power systems where reliability at 125°C is mandatory.

Availability

SBR30A45CT is available at Aetrix Electronics and suitable for server power supplies, industrial DC/DC converters, and telecom rectifier modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for SBR30A45CT 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 North America.

The SBR® product line was developed specifically for high-efficiency, high-reliability power conversion-targeting applications where Schottky limitations (voltage rating, temperature instability) and FRD drawbacks (slow recovery, high VF) must be overcome simultaneously.

FAQ

Is SBR30A45CT pin-compatible with standard TO-220AB dual diodes like MBR3045CT?

Yes-SBR30A45CT uses identical TO-220AB mechanical dimensions and 3-pin common-cathode pinout (A-K-A), enabling direct PCB footprint replacement. No layout changes are needed, though thermal and electrical performance improvements may allow heatsink downsizing.

What is the maximum recommended case temperature for continuous operation?

The absolute maximum case temperature is 150°C, but continuous operation should be limited to TC ≤ 100°C to maintain IO = 15A per leg. Derating curves in DS30981 show 30A total current is sustainable only below TC = 60°C; above that, linear derating applies.

Does the mounting tab carry electrical potential, and is insulation required?

Yes-the metal tab is electrically connected to the common cathode (Pin 2). If the heatsink is grounded or at a different potential, an insulating washer and shoulder washer must be used to prevent short circuits. Thermal interface material must remain electrically isolating.

How does SBR30A45CT perform in reverse recovery compared to fast recovery diodes?

SBR30A45CT exhibits soft, low-Q_rr recovery-measured as negligible reverse recovery current overshoot and no voltage ringing-unlike fast recovery diodes that generate significant EMI due to abrupt turn-off. This eliminates need for snubbers in most 100–300 kHz designs.