Diodes Incorporated SBR20A45CTFP

Overview

SBR20A45CTFP from Diodes Incorporated is a 45 V, 20 A dual common-cathode super barrier rectifier in ITO-220AB package, featuring low forward voltage (0.47 V at 20 A, 25°C), soft fast switching, and high-temperature stability up to +150°C. It replaces conventional Schottky and standard PN rectifiers in high-efficiency AC/DC front-end and DC/DC secondary-side rectification.

For engineers reviewing the SBR20A45CTFP datasheet, SBR20A45CTFP pinout, SBR20A45CTFP application, or SBR20A45CTFP equivalent, key selection criteria include forward voltage at 20 A, thermal resistance (4°C/W junction-to-case), peak repetitive reverse voltage (45 V), leakage current at 125°C (100 µA), and ITO-220AB isolation rating (2000 V_AC).

Technical Context

This dual-leg super barrier rectifier integrates two independent anode terminals sharing a common cathode, enabling synchronous or interleaved rectification topologies. Its patented SBR structure delivers lower VF than standard Schottkys while maintaining superior high-temperature leakage performance.

The device operates with 0.41–0.60 V forward drop across its rated current range (10–20 A) and temperature range (25–125°C), and sustains 180 A non-repetitive surge current under 8.3 ms half-sine conditions - critical for hold-up capacitor charging transients.

Key Specifications

Pinout & Package

Package: ITO-220AB - Insulated TO-220 variant with electrically isolated tab, UL 94V-0 molded plastic body, matte tin-plated copper leadframe, and 1.65 g mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20CPH045 and MBR2045CT, SBR20A45CTFP uniquely balances low VF, ultra-low high-temp leakage, and built-in 2000 V isolation - making it optimal for compact, thermally constrained, and safety-certified power supplies.

Availability

SBR20A45CTFP is available at Aetrix Electronics and suitable for server power supplies, industrial DC/DC converters, LED drivers, and automotive infotainment PSUs requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for SBR20A45CTFP 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® Super Barrier Rectifier product line targets high-efficiency power conversion where Schottky VF is needed but leakage and thermal instability limit standard devices - especially in 12–48 V output SMPS and automotive-grade supplies.

FAQ

What is the maximum continuous operating temperature for SBR20A45CTFP?

The device is rated for junction temperatures from –65°C to +150°C. At 25°C ambient with a 4°C/W heatsink, it supports 10 A continuous per leg. Derating follows Figure 4: at 100°C ambient, max average current drops to ~5.5 A per leg to maintain T_J ≤ 150°C.

Can SBR20A45CTFP be used as a direct replacement for MBR2045CT?

Yes, pin-compatible in ITO-220AB footprint, but with critical improvements: 0.47 V vs. 0.58 V VF at 20 A (20% lower loss), and 100 µA vs. 1500 µA leakage at 125°C. No circuit redesign needed, though thermal margin increases significantly.

Does the ITO-220AB package require electrical isolation hardware when mounted to a heatsink?

No - the ITO-220AB's molded plastic case provides 2000 V_AC isolation between terminals and heatsink. Direct mounting is permitted without mica washers or insulating pads, simplifying thermal design and reducing thermal resistance.

What is the significance of the "FP" suffix in SBR20A45CTFP?

The "FP" denotes ITO-220AB package with green (halogen/antimony-free) molding compound and lead-free terminations. It satisfies IPC-1752A Class 3 environmental compliance and EU RoHS 2 directives, with bromine/chlorine <900 ppm and antimony <1000 ppm.