Bel Fuse Inc.

- Bel, a driving force in the future of global connectivity, manufactures quality components for the computer, networking and telecommunications industries. Partnered with these markets' leaders, the Company engineers devices for those next-generation technologies which enable high-speed communication. Our ever-expanding portfolio, broadened by the acquisition of the Passive Components Group of Insilco Technologies, including InNet Technologies, Stewart Connector, TRP Connector B.V., Signal Transformer, and Cinch Connectors, now offers an even wider range of synergistic products. From circuit protection devices to power conversion modules...transformers to connector modules and integrated line interference engineers and purchasing personnel alike benefit from Bel's extensive array of products and solutions.

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Go To Product Training Module Index Page

Digi-Key’s library of more than 2000 exclusive PTM Online… On Demand® product training modules is a collection of training tools created with you – the busy design engineer – in mind. They are provided with the cooperation of participating supplier partners. From this one source, you can learn about the latest products and technologies, download datasheets, check inventory, contact our technical staff, and place an order for same-day shipment.

These modules are available in audio and non-audio formats and listed by supplier in easy-to-find alphabetical order. Simply locate the module that interests you and click on your format of choice. We hope you find these tools useful, and with new modules added continuously, we invite you to stop back often to see what’s new.

Product Training Modules Online...On Demand® is a registered trademark of Digi-Key Corporation.

Updated PTM = Updated Product Training Module - PTM        New PTM = New Product Training Module - PTM

Module NamePreviewAudioNon-AudioDurationParts List
  • ARJ45 Category 7a Modular Connector System- Stewart
View10 minParts List
  • Benefits of DS-3 Lines
View5 minParts List
  • Configured Solutions Video Patching
2.3MB1.1MB5 minParts List
  • Dual Winding Inductors in SEPIC Converters
View10 minParts List
  • Integrated Connector Module, ICM
View10 minParts List
  • MagJack® Integrated Magnetics Modular Jacks
View15 minParts List
  • Modular Jack EPP-918A Environmental Protection Gel - Stewart
View5 minParts List
  • Surface Mount Wire Wound Inductors
5.0MB1.1MB10 minParts List

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Fuses 5 mm x 20 mm T-Lag Cartridge and Axial 0659 SeriesFuses 5 mm x 20 mm T-Lag Cartridge and Axial 0659 Series - Bel Fuse's 0659C (cartridge) and 0659P (pigtail leads) are lower cost, fully automated versions of the Bel 5HT 5 mm x 20 mm cartridge and 5 HTP pigtail lead fuse series. Each series is designed to and certified under IEC 60127-2, sheet 5, time-lag, high break capacity with agency approvals from UL, CQC, CCC, PSE, and VDE. Fuses rated from 1 A to 6.3 A, 250 VAC, with 1500 A break capacity.  More...

Fuse Square SMD 2410 Size Fast Acting 0679L SeriesFuse Square SMD 2410 Size Fast Acting 0679L Series - Bel Fuse's 0679L series is lower cost, fully automated version of the popular SSQ 2410 size SMD fuse series. The 0679L is a UL (UL/CSA 248-14 standard) component recognized for use in U.S. and Canada, and is rated from 250 mA up to 20 A at 125 VAC/VDC. The SSQ type of product has been used for many years in various networking and data process applications, including POE, POE+. Also computing, consumer electronics, telecom, and power supply applications.  More...

Product Information

Bel Fuse Products

Fuse Cross Reference
Competitive part numbers and Bel Fuse Inc. fuse equivalents

Fuse Ordering Information
Fuse part number logic and packaging options

Fuse Selection User Guide
Application guidance and Pb-free solder profile

Fuse Terminology
Product definition and fuse de-rating guide

I²t Explanation
I²t test methods and data

Lightning Surge Withstand - RJS and SMP Series
Lightning surge withstand for RJS and SMP series (fuses for telecom applications)

PTC Competitor Cross Reference
Competitive part numbers and Bel Fuse Inc. PTC equivalents

SMD Comparison
Recommended pad layout for various surface mount packages

Bel Power DC/DC Products

Intermediate Bus Architecture
Application guidance and importance in using intermediate bus architecture for POL DC/DC converters

Selection Guide
DC/DC converter selection guide

Bel Power Product Catalog
DC/DC converter product focus catalog

Stewart Connector products

ARJ45™ CAT7a Connectors Selector Guide
Category 7a connection system, next generation of high speed connectors selection with benefits of using CAT7a connectors

MagJack® Connector Modules - IC Cross-Reference
Quick cross reference pull down menu showing IC manufacturer and recommended MagJack® parts

MagJack® Recommendations and IC Cross Reference
MagJack® part listing and MagJack® recommendations for IC manufacturer parts in PDF format

Modular Plug Quick Reference Guide

Additional Links

Bel Fuse Inc. Technical Product Library

Safety Information

Fuse Safety Certificates
Safety certificates for fuse products

Fuse Safety Standards
International safety standards including UL248, IEC127, PSE/MITI, CE, and China CCC

PTC Resettable Devices Safety Certificates
Safety certificates for PTC products

Environmental Information

Additional RoHS Compliance Information
Additional links providing information on RoHS compliance at Bel Fuse Inc.

Declaration of EU RoHS Compliance
Declaration of RoHS compliance for fuse and PTC products

Lead Free Initiative and Elimination of Banned Substances
Bel Fuse Inc. and its subsidiaries commitment to the elimination of lead

RoHS Compliance and Position Statement
Position statement on RoHS, China RoHS, tin whisker growth, and halogen free products

RoHS Compliance Statement - MQ/MS Fuses
Declaration of RoHS compliance for MQ/MS fuse products
Related Product Brands

Bel Announces Newly Consolidated Facility in Silicon Valley
Bel Closes Acquisition of TE Connectivity’s Transpower Magnetics Business
Bel Completes Acquisition of Cinch Connectors for $39 Million - January 29, 2010

More about Bel Fuse Inc.

Building on over 50 years of solid financial performance, and trading on the Nasdaq (BELFA and BELFB), we continue to grow and prosper by employing the latest high volume manufacturing technologies at our ISO 9001 facilities throughout the world. We attribute our success to an unmatched dedication to superior customer service and technical support, together with the utmost in cost-effective solutions.

Bel's products, available through a global network of representatives and distributors, include:
  • Connectors - Bel Stewart Connectors & TRP Connectors, ICMs for 10/100/1000Base-T and VoIP use, plus Category 5 and Category 6 modular jacks and connectors.
  • Power Modules - Full lines of DC/DC converters, for 2.5V to 48V and 1A to 200A applications, provide high efficiency in small packages.
  • Broadband Modules - Integrated components for xDSL (CO and CPE options), Powerline, T1/E1/J1 and ISDN employment optimize leading ICs' performance.
  • Discrete Magnetic Components - for xDSL, T1/E1/J1, Gigabit Ethernet, 10/100Base-T, HomePNA, VoIP, and cable modem applications.
  • Circuit Protection Devices - Wide array of miniature and micro fuses, together with SIP modules, meet UL, CSA, SEMKO MITI and VDE standards.
  • Signal Transformer Products - Signal Transformer's UL, VDE and CSA Certified complete portfolio of standard and custom power transformers.
  • Cinch Connectors Products – reliable, high quality connectors Jones/J plugs and sockets, RF, barrier, ModICE, and NX and QSFP+ cable assemblies to name a few.
Bel Fuse Inc.
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