Circuit Protection

The Frequency Response Effects of Internal Component Configuration on Multiple Ceramic Dielectric System Written By: S. Pala | R. Demcko | M. Berolini Abstract: The purpose of this paper is to discuss the frequency response effects of internal designs within ceramic systems. Those effects will be related to component performance parameters for devices used to suppress ESD and control EMI in high speed data lines, which are prone to be damaged by ESD. As communication speed increase, systems become more complicated and performance standards tighten, options to improve EMI/RFI performance becomes of great importance. Long term EMI performance and reliability are of particular importance in automotive, medical and aviation application sectors. A performance comparison will be made between single element

SMT Process Characteristics of AVX TransGuards Written By: Ron Demcko Abstract: TransGuards are uniquely suited for wide-scale usage in SMT applications. TransGuards exhibit many advantages when used in SMT assemblies. This paper is a general guideline aimed at familiarizing users with the characteristics of soldering multilayer SMT ZnO TransGuards.

LCD Driver Circuit EMI Filtering Options Written By: Ron Demcko Abstract: A review of EMI filter component options, comparing product performance, device characteristics and related factors (eg PCB board area, placement cost, etc.).

How to Choose the Correct Accu-Guard Fuse for Circuit Protection Written By: Irina Daynov | Barry Breen Abstract: The ACCU-GUARD is designed to meet the need of electronic circuits for a small, accurate surface mount fuse. This article presents design guidelines for achieving optimal protection of circuits with ACCU-GUARD. All major parameters are described including operating temperature, circuit voltage, fault current, steady state current and current pulses (Joule integral).

Capacitor Selection and EMI Filtering Written By: Jeffrey Cain | Steve Makl Abstract: MLCCs are an inexpensive, yet effective, method for reducing the noise on both power/ground systems and signal lines themselves. Choosing the proper capacitance value such that the impedance is minimized at the frequency of interest also makes a difference.

AVX Staticguard Performance Comparison to SOT-23 SMT Diodes Written By: Ron Demcko Abstract: AVX StaticGuard is designed to provide transient protection for MSI to VLSI CMOS circuitry. This article presents performance characteristics of low energy MLV transient voltage suppressors relative to low energy silicon diodes. All major parameters are described, including leakage current, clamping voltage, capacitance, peak current and repetitive strike performance. AVX StaticGuard is shown to have superior performance to SOT 23 diodes in transient suppression applications.

AVX EMI Solutions Written By: Ron Demcko | Chris Mello | Brian Ward Abstract: EMC compatibility is becoming a key design parameter for a most designers of electronic systems. This paper compares the efficiency and effectiveness of various EMI filter options available to designers. Integrated Thick Film LC T filters are shown to be a cost effective method to improve board level EMC performance while shrinking system design size and keeping costs minimized. A general recap of EMI sources is given as well as a brief recap of PCB layout and optimization rules.

A Multilayer Approach to Transient Voltage Supressors Written By: John Maxwell | Ning Chan | Allen Templeton Abstract: Improvements in integrated circuits have resulted in increased speed and increased ESD sensitivity. New systems require external protection more than ever before but advances in surface mount technology and product miniaturization place severe size constraints on protection components. Advances in ceramics now allow transient voltage suppressors to be built with multilayer structures resulting in improved electrical performance and in smaller sizes than comparable disc configurations. Clamping voltage and peak current performances approaching zener diode transient suppressors are achieved in the common 1206 (3.2 x 1.6mm) chip size, one third the size of SMT disc varistors or SMT zener diode supressors.