Diodes Incorporated SBR20A45CTB-13-G

Overview

SBR20A45CTB-13-G from Diodes Incorporated is a 20A dual common-cathode Super Barrier Rectifier in TO-220AB package, rated for 45V peak repetitive reverse voltage, with typical forward voltage of 0.47V at 10A/25°C and 0.60V at 20A/25°C, designed for high-efficiency DC power supplies and AC/DC adapters.

For engineers reviewing the SBR20A45CTB-13-G datasheet, SBR20A45CTB-13-G pinout, SBR20A45CTB-13-G application, or SBR20A45CTB-13-G equivalent, key selection criteria include low VF stability over temperature, soft switching behavior for EMI reduction, thermal resistance of 2°C/W (junction-to-case), and RoHS-compliant green molding compound construction.

Technical Context

This dual-leg rectifier integrates two independent 10A-rated super barrier diodes sharing a common cathode terminal, enabling full-wave bridge configurations with reduced conduction loss versus standard Schottky or fast recovery diodes. Its patented super barrier structure delivers lower forward voltage than conventional Schottkys while maintaining superior high-temperature leakage performance.

The device operates across –65°C to +150°C junction temperature range and supports non-repetitive surge currents up to 180A (8.3ms half-sine). Thermal design leverages the TO-220AB package's 2°C/W R_θJC, requiring heatsinking for sustained 20A operation above 75°C ambient.

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 mounting tab (electrically connected to cathode).

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20CPH04-M3 and MUR2040CTG, SBR20A45CTB-13-G uniquely balances 45V blocking, sub-0.5V forward drop, and TO-220AB manufacturability-making it optimal for cost-sensitive, thermally constrained 12–48V DC/DC and AC/DC outputs where efficiency and EMI are co-primary constraints.

Availability

SBR20A45CTB-13-G is available at Aetrix Electronics and suitable for AC/DC power adapters, industrial DC power supplies, and LED driver secondary-side rectification requiring stable component supply, long-lifecycle support, and RoHS-compliant green packaging.

Supply support for SBR20A45CTB-13-G 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® Super Barrier Rectifier product line targets high-efficiency power conversion in consumer, computing, and industrial applications-specifically engineered to replace Schottky and fast recovery diodes where low VF, soft switching, and high-temperature reliability are mandatory.

FAQ

Is SBR20A45CTB-13-G pin-compatible with standard TO-220AB dual-diode rectifiers?

Yes-SBR20A45CTB-13-G uses industry-standard TO-220AB pinout (Anode1–Cathode–Anode2) and shares identical mechanical dimensions and mounting hole placement with legacy dual-diode rectifiers such as MB20100CT. The cathode tab is electrically connected to Pin 2 and the metal mounting surface, requiring appropriate isolation when heatsinked.

What is the maximum continuous current per anode at 100°C ambient with a 10°C/W heatsink?

At 100°C ambient and using a 10°C/W heatsink, junction temperature rises by 20°C (2°C/W × 10A) + 100°C = 120°C, within the –65°C to +150°C operating range. Derating curves confirm 8.5A per anode is sustainable at 100°C ambient-yielding 17A total device output under those thermal conditions.

Does the "-G" suffix indicate halogen-free status beyond RoHS compliance?

Yes-the "-G" suffix denotes Diodes Incorporated's Green compound variant: fully halogen-free (<900ppm bromine/chlorine, <1000ppm antimony) and compliant with IEC 61249-2-21. This exceeds baseline RoHS requirements and satisfies strict environmental mandates in EU, Japan, and major datacenter OEM specifications.

Can SBR20A45CTB-13-G be used in synchronous rectification circuits?

No-it is a passive rectifier and lacks gate-control circuitry. However, its soft-switching behavior and low VF make it a preferred replacement for MOSFET-based synchronous rectifiers in designs where control complexity, cost, or layout constraints preclude active drive-especially in fixed-frequency flyback and forward converters below 200kHz.