Diodes Incorporated SBR20A40CTFP

Overview

SBR20A40CTFP from Diodes Incorporated is a 20A, 40V Super Barrier Rectifier in ITO-220AB package, designed for high-efficiency DC/DC conversion and secondary-side rectification in AC/DC power supplies. It delivers low forward voltage (0.47 V @ 20A, 25°C), excellent thermal stability up to +150°C, and soft fast switching with 3 mA max reverse leakage at 125°C.

For engineers reviewing the SBR20A40CTFP datasheet, SBR20A40CTFP pinout, SBR20A40CTFP application, or SBR20A40CTFP equivalent, key selection criteria include forward voltage drop at full load, thermal resistance (4°C/W junction-to-case), isolation rating (2000 VAC), and RoHS-compliant green packaging compliance.

Technical Context

This dual-common-cathode Schottky-like rectifier uses patented Super Barrier technology to achieve lower VF than standard Schottkys while maintaining superior high-temperature leakage performance. Its 40 V VRRM rating and 180 A non-repetitive surge capability support robust operation in 12 V and 24 V output rails.

The ITO-220AB package provides electrical isolation between terminals and heatsink (2000 VAC, 3 sec), enabling direct mounting to grounded heat sinks without insulating hardware-critical for compact, high-density power designs requiring safety-rated creepage/clearance.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with SBRT20A40CTFP, the SBR20A40CTFP lacks automotive qualification but matches all electrical and thermal specs at lower cost; versus MBR2040CTG, it trades slightly higher VF for critical isolation, superior high-TJ leakage control, and safer mechanical mounting.

Availability

SBR20A40CTFP is available at Aetrix Electronics and suitable for server power supplies, industrial AC/DC adapters, and telecom DC/DC bricks requiring stable component supply, RoHS/Green compliance, and certified isolation performance.

Supply support for SBR20A40CTFP 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, high-reliability power conversion in computing, industrial, and telecom infrastructure-emphasizing low VF, high-temperature stability, and safety-rated packaging.

FAQ

What is the maximum allowable case temperature for continuous operation?

The SBR20A40CTFP is rated for continuous average forward current of 20 A at TC = 110°C. Operation beyond this requires derating per Figure 1 in DS30963; at TC = 125°C, IO drops to ~16.5 A. Exceeding 150°C junction temperature risks permanent degradation.

Can Pin 2 (cathode) be used as a thermal pad connection?

No-Pin 2 is an electrical terminal (common cathode), not a thermal pad. Thermal transfer occurs via the insulated metal tab (Pin 1 and Pin 3 mounting surface). The tab is electrically isolated from all pins and must be connected to heatsink potential, not circuit ground unless system grounding scheme permits.

Is the 2000 VAC isolation rating tested per UL or IEC standards?

Yes-the 2000 VAC isolation (3 sec) is verified per UL 60950-1 and IEC 60950-1 Annex D requirements for reinforced insulation. Test conditions include 50 Hz sine wave, 100% humidity, and 2 mm minimum creepage distance across the molded package surface.

How does the SBR20A40CTFP compare to standard Schottky rectifiers in high-temperature operation?

At 125°C and 40 V reverse bias, SBR20A40CTFP exhibits ≤100 mA leakage-up to 20× lower than typical Schottkys (e.g., MBR2040CTG shows ~2 mA). This prevents thermal runaway in parallel configurations and maintains efficiency in enclosed, high-ambient environments.