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MGA-A: keine Zinn-Whisker, keine Zinn-Dendriten

vonarbes — Mon, 27 Aug 2018 07:26:33 GMT

SCHURTER erweitert seine erfolgreiche MGA / MGA-S Linie von SMD-Keramiksicherungen der Dimension 1206 um eine Aviatik-Version, die Zinn-Whisker frei ist und trotzdem vollständig auf eine bleihaltige Beschichtung verzichtet.

Kristalline Zinn-Dendriten und Zinn-Whisker stellen in der hochverdichteten Elektronik ein erhebliches Risiko für Kurschlüsse dar. Zinn-Dendriten entstehen während dem galvanischen Beschichtungsprozess, indem sich an den Endkappen und am Gehäuse Zinnauswüchse formieren. Lediglich eine aufwändige Inspizierung und Reinigung gemäss MIL-PRF 23419 kann das Problem beseitigen. Zinn-Whisker hingegen entstehen unvorhergesehen und vor allem nach dem galvanischen Beschichtungsprozess. Der zugrundeliegende physikalische Prozess ist noch nicht vollkommen geklärt, jedoch wurde das Problem bis anhin mit der Beimischung von Blei umgangen.

Blei ist jedoch ein mittlerweile vielerorts unerwünschtes Element (RoHS-Richtlinien). Aus diesem Grund hat SCHURTER die erfolgreiche SMD-Dünnfilm-Sicherungsfamilie MGA um eine neue Variante erweitert. Neben der klassischen MGA und der ESA-zertifizierten Raumfahrtsicherung MGA-S gibt es neu die Aviatik-Version MGA-A. Sie verzichtet komplett auf eine bleihaltige Beschichtung und setzt an dessen Stelle auf Gold. Vergoldete Endkappen bieten weder Whisker noch Dendriten irgendeine Angriffsfläche. Somit ist die neue MGA-A nochmals einen Tick sicherer in der Anwendung, was besonders in der hochsensiblen Aviatik-Industrie aber auch in der industriell betriebenen Raumfahrtindustrie von grösster Bedeutung ist.

Der technische Aufbau entspricht jenem der Raumfahrtsicherung MGA-S. Das heisst: hermetische dichte, ultrarobuste Konstruktion, die sich bestens zum Vergiessen für den Einsatz in eigensicheren Anwendungen nach ATEX und IECEx-Anforderungen eignet. Trotz kleinster Abmessungen (Dimension 1206) verfügt die MGA-A über ein besonders hohes Ausschaltvermögen von bis zu 300 A bei 125 VDC und lässt sich in einem breiten Temperaturbereich von -55 °C bis +125 °C einsetzen.

Die neue MGA-A von SCHURTER eignet sich für alle Anwendungen, bei denen höchste Anforderungen an Zuverlässigkeit und Verfügbarkeit gestellt werden.

Unbändiger Leistungshunger

vonarbes — Mon, 27 Aug 2018 07:16:52 GMT

Maximalen Komfort und höchste Sicherheit wünscht sich jeder Automobilist. Hierfür wird immer mehr Elektronik ins Fahrzeug gepackt. Dies führt zu einer sich ständig erhöhenden Leistungsdichte mit nicht unerheblichem thermischem Gefahrenpotential. Mit Thermosicherungen begegnet SCHURTER dieser Gefahr.

Thermosicherungen werden zum sicheren und einmaligen Trennen von Stromkreisen verwendet, wenn eine vorgegebene zulässige Betriebstemperatur überschritten wird. Sie verhindern dadurch einen möglichen Brand auch nach Jahren des zuverlässigen Betriebs. Die häufigsten Anwendungen finden sich in unbeaufsichtigter Leistungselektronik zum Absichern von Netzgeräten, Elektromotoren, Lüftern und vielem anderem mehr. Um welche Wärmequelle es sich aber handelt, spielt eigentlich keine Rolle. Jede Anwendung, in welcher übermässige Wärme entstehen kann, bietet Potential für eine Thermosicherung.

Solving High Performance Circuit Protection Needs in Space-constrained, High Density Electronics

rscasny — Fri, 06 Jan 2017 20:52:26 GMT

Solving High Performance Circuit Protection Needs in Space-constrained, High Density Electronics

And as equipment shrinks, the reality is that there is a finite amount of space on the printed circuit board (PCB). This means designers must constantly seek circuit solutions that provide the effective overvoltage protection they need to maintain the highest reliability, but this protection cannot be at the cost of valuable PCB space. To help OEMs overcome their shrinking application space challenges while still maintaining superior protection capabilities, Bourns engineers took an innovative approach to gas discharge tube (GDT) design.

This white paper will cover the basics of conventional GDT technology that include how its size and dimensions are critical to its handling of surge energy. Its overall size, however, many times is an obstacle in meeting smaller design requirements. It will then present a breakthrough design methodology to squeeze the GDT to significantly reduce the GDT’s height, weight and overall volume. Also highlighted will be the various space-saving advantages designers can achieve with Bourns’ new extremely compact GDT devices.

bourns-tcs-high-speed-protectors-(hsps)-in-vdsl-applications-white-paper.pdf

rscasny — Fri, 06 Jan 2017 20:48:46 GMT

Robust Protection and Excellent Signal Quality for Gigabit Ethernet Applications Using Transient Current Suppressor(TCS[emoticon:7d377b609b6f44bf9290e3d8a0b9a733]) Technology

Bourns_Primary-Secondary_Telecom_WhtPpr.pdf

rscasny — Fri, 06 Jan 2017 20:41:48 GMT

Revised Standards Provide Design Options for Primary and Secondary Protection

Telecommunications networks are subject to surges from lightning or power line faults, and the effects of these can be extremely detrimental to systems and equipment. The equipment in a telecommunications network needs to be protected from fault voltages and currents induced onto the conductors. Standards provide equipment test requirements guidelines and often are separated into two main classifications: primary and secondary. Standards such as ITU-T and Telcordia GR-1089-CORE, Issue 6, contain tests in which equipment is tested with the primary protector in place. With vast differences distinguishing one telecommunication network from the next, standards provide a basis for equipment suppliers and customers alike to select the surge

protection criteria that best suits their specific network application. The Alliance for Telecommunications Industry Solutions (ATIS) recently has updated its coordination document “Electrical Coordination of Primary and Secondary Surge Protection for Use in Telecommunications” (ATIS-0600338.2010) to aid in suitable design.

This paper discusses how to ensure system coordination by designing with various series coordination elements as presented in the updated ATIS document. Various system coordination styles and protection technology options will be presented with an emphasis on current-type coordination.

Bourns_FLAT_Surge_Arrestor_White_Paper.pdf

rscasny — Fri, 06 Jan 2017 20:37:42 GMT

Solving High Performance Circuit Protection Needs in Space-constrained, High Density Electronics

Smaller, more sensitive electronics applications are the result of continued demands for higher density and higher performance designs. While the features and capabilities of increasingly integrated applications have advanced substantially, these compact, and thus more sensitive designs, are now more susceptible to damage and unscheduled downtime from transient threats such as lightning and other high voltage surges. And as equipment shrinks, the reality is that there is a finite amount of space on the printed circuit board (PCB). This means designers must constantly seek circuit solutions that provide the effective overvoltage protection they need to maintain the highest reliability, but this protection cannot be at the cost of valuable PCB space. To help OEMs overcome their shrinking application space challenges while still maintaining superior protection capabilities, Bourns engineers took an innovative approach to gas discharge tube (GDT) design.

Bourns_LSP_White_Paper.pdf

rscasny — Fri, 06 Jan 2017 20:21:28 GMT

New Open LED Shunt Protection (LSP) Devices

Help Prevent High Reliability LED Lighting Application Failures

As LEDs continue to penetrate a wide range of diverse market sectors and become the preferred means of lighting, the requirement for circuit protection cannot be ignored. In many illumination applications, multiple LEDs are connected in series strings to achieve light output comparable to their incandescent or fluorescent counterparts. Some solid-state lighting luminaires are configured in series strings of twenty or more LEDs. In these configurations, one open-circuit LED can cause the entire LED string to go dark, resulting in reduced performance, possible maintenance calls, and costly warranty returns.

As an innovator in circuit protection technology, Bourns has a long history of developing reliable solutions for a broad range of markets and applications. In working with its customers, Bourns realized a critical need for circuit protection in LED designs that would help them to be more robust and could be integrated with the least amount of impact on the design. Adding Bourns[emoticon:6abd1cb2558648488dbea31d006afc59] LSP Series shunt protectors to an LED design allows the healthy LEDs in the string to remain illuminated by shunting current around the inoperable open circuit LED. The new Bourns[emoticon:6abd1cb2558648488dbea31d006afc59] LSP Series of open LED shunt protectors is an effective solution for a variety of LED lighting applications including street lighting, high reliability lighting fixtures and backlight signage systems.

This paper was developed to help designers understand common threats to LED lighting systems, and provides the best design practices to implement Bourns[emoticon:6abd1cb2558648488dbea31d006afc59] LSP devices as an effective circuit protection solution in LED lighting applications.

Bourns_Reliable_Protection_for_Automotive_WhitePaper.pdf

rscasny — Fri, 06 Jan 2017 19:58:32 GMT

Employing Reliable Protection Methods for Automotive Electronics

Automotive systems continue to become more sophisticated with the introduction of new, modified and improved features every year. Each feature must be powered, protected and connected to its respective interface within the overall automotive system. Direct current (DC) to DC converters are necessary to convert the main 12 V automotive battery supply to a range of voltage levels required for operation of these various features. DC-DC converters are used to provide DC power to heavy loads in hybrid and electric vehicles, and for lighting, displays, infotainment and any other electronics in all types of vehicles. Once powered and operating, the automotive electronics are subject to various transient events and must be tested to ensure they comply with standards such as ISO 7637. With protection in place, the electronics can be connected to the system using various standard interfaces such as CANbus. It is important to ensure the system reliability of these interfaces in terms of Electromagnetic Compatibility (EMC) and Common Mode Noise (CMN). The protection of the system has to be re-examined after all interfaces are in place to ensure adequate isolation and protection. Finally, Electrostatic Discharge (ESD) considerations must be made since the electronics are subject to ESD events beginning as early as circuit assembly and continuing throughout the lifetime of the vehicle.

Bourns_CP_Smart_Meter_Power_Comm_White_Paper.pdf

rscasny — Fri, 06 Jan 2017 19:53:07 GMT

Circuit Protection Solutions Optimized for Smart Meter Power, Measurement and Communications Port Protection

The process of generating and distributing energy has been undergoing changes over the past several years and more changes are on the horizon. Generating energy from alternative sources, such as solar power, and spanning to the smart meter at the customer’s location adds to the requirement and design challenge complexities facing engineers. One such challenge is selecting a Photovoltaic (PV) inverter and placing it within a system that delivers the desired quality and reliability. Additionally, the awareness of downtime is greater, so circuit protection solutions must be robust to ensure systems remain unharmed when exposed to overcurrent and overvoltage conditions from transients. The presence of communications ports in smart meters introduces another set of interfaces to protect. Overall, a design paradigm shift required for energy generation and distribution systems can be narrowed down to three main areas within a smart meter: power, measurement and communications.

This paper will introduce a variety of components available to help optimize the circuit protection design in smart meters that includes power circuits, current sensing for measurement and port protection for communications.

Bourns_Smart_Meter_White_Paper.pdf

rscasny — Fri, 06 Jan 2017 19:24:35 GMT

Monitoring and Protecting Smart Meter Circuitry and Communications

The smart grid is the next evolution of the utility framework that converges utility providers, telecommunications infrastructure and information technology. The ultimate goal is to allow seamless communication between utility companies and their end users for a true “end-to-end” smart grid. One of the key application elements of the smart grid is the smart meter located at the end-user’s location that is designed to allow two-way, real-time communication between the utility substation or headquarters and the user. Smart meters are hybrid devices combining measurement, processing, and recording with communication functions. Smart meters are available with numerous communication protocols to transmit resource consumption information via a network back to the local utility company for monitoring and billing purposes also known as telemetering.

White Paper – How to Patent a Product

Former Member — Thu, 06 Mar 2014 12:16:12 GMT

Read this quick and easy guide to get an insight into applying for a patent. You will learn how to avoid expensive fees,when you will need to use a patent and the pros and cons of delaying your application. Find out more here How to Patent a Product - Download Whitepaper | Newbury Electronics

How to CE Mark a Product

Former Member — Thu, 06 Mar 2014 12:02:21 GMT

Read this white paper to find out how you can CE Mark your product. You will learn why CE Marking is easier than you think, an 11 step process to CE Marking your product and how it can benefit your business.

Panasonic Multi-Layer Ceramic Varistors(EZJ series) -Zener diode replacement by MLCV-

Former Member — Wed, 28 Aug 2013 12:14:51 GMT

Panasonic, a worldwide leader in Circuit Protection Products, introduces the EZJ Series of Multi-Layer Ceramic Varistors (MLCV’s).

The EZJ Series is well suited for the protection of sensitive circuitry from ESD damage.

■ Varistor Characteristics and Equivalent Circuit

A Multilayer Varistor does not have an electrical polarity like Zener diodes and is equivalent to total 3 pcs of 2 Zener diodes and 1 capacitor.

■ Replacement of Zener diode

Using a Multilayer Varistor to replace a “Zener diode & Capacitor” saves both the amount of space and number of components used.

The benefits of replacing TVS (Zener diode) to MLCV:

-size/weight reduction,

-lower cost

-good ESD/Surge solution at the same time

Characteristics Comparison MLCV vs. Zener Diode
Characteristics	MLCV	Zener Diode
ESD Suppression	Excellent	Excellent
Deterioration Against ESD	Excellent	Good
Allowable Power	Excellent	Fair
Capacitance Change	Excellent	Poor
Mounting Area	Excellent	Fair

■ Features

• Varistor Voltage: 6.8 to 65 V

• Maximum Allowable Voltage: 3.7 to 40 VDC

• Operating Temperature Range: -40ºC to 85ºC

• Multi-Layer Monolithic Ceramic Construction

• Meets EIC61000-4-2 Level 4 Standard

• Ideal usage for USB 2.0, IEEE1394, and HDMI high speed data busses

• Reflow Soldering

• RoHS Compliant

■ Benefits

• Excellent ESD Suppression

• 8kV Contact Discharge Max ESD

• Use to Protect DC Voltage Lines and Low Speed Signal Lines

• Reduced Component Count and Real Estate Versus Using Zener Diodes

■ Industries

• Automotive

• Communications / Telecommunications

• LED Lighting

• USB

• LCD Panels

• Gaming

• Instrumentation

• Consumer Products

■ Applications

• ESD Protection for IC Inputs

• Bus Lines

• LED’s

SCHURTER: SMD fuse with high breaking capacity

vonarbes — Tue, 09 Apr 2013 09:16:10 GMT

UMT-H

SCHURTER: Multibox Hausanschluss

vonarbes — Tue, 09 Apr 2013 09:10:24 GMT

Vorteil beim Hausanschluss - überzeugend in Design, Ökologie und Innovation