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VJ2220Y104 Datasheet(PDF) 8 Page - Vishay Siliconix |
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VJ2220Y104 Datasheet(HTML) 8 Page - Vishay Siliconix |
8 / 10 page www.vishay.com For technical questions, contact: mlcc.specials@vishay.com Document Number: 45046 104 Revision: 28-Oct-08 VJ OMD - X7R Vishay Vitramon Surface Mount Multilayer Ceramic Chip Capacitor Solutions for Boardflex Sensitive Applications BOARDFLEX SENSITIVE APPLICATIONS - SOLUTION: A predominant failure mode in multilayer ceramic chip capacitors is cracking caused by board flexure. Cracks can then create a path for current to pass from one electrode through the dielectric to an opposing electrode or from the terminations at one end of the MLCC through the dielectric to an opposing electrode. This may subsequently result in capacitance loss, leakage - low Insulation Resistance (IR) - and/or more seriously, high current shorts. A short circuit condition in the surface mounted capacitors can cause further failures of downstream components. Vishay’s Open Mode Design Capacitors (VJ OMD - Cap series) reduce the risk of these destructive conditions through MLCC designs that prevent board flexure cracks reaching the opposing electrode. VJ OMD - Cap MLCCs reduce the risk of early field failures associated with board flex cracks. However, it is important to note that even in the open mode designs the presence of flexure related cracks can cause capacitance loss leading to localized stresses on the parts. eventually, depending on the application environment, including such factors and high voltage pulse frequency and thermal cycling this may lead to internal breakdown of the component. POLYMER TERMINATION Polymer termination provides additional protection against board flexure damage by absorbing greater mechanical and thermal stresses. Componenets can be packaged, transported, stored and handled the same standard terminated product. Wave and reflow soldering of MLCC does not require modification to equipment and/or process. Polymer termination greatly reduces the risk of mechanical cracking however it does not completely eliminate. STANDARD TERMINATION Exposed Electrodes = Electrical Short OMD CAP PLUS POLYMER TERMINATION No Exposed Electrodes = No Electrical Short BEND TEST RESULTS 2220 CASE SIZE 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 Log. (Polymer Termination) Standard Termination Polymer Termination Log. (Standard Termination) BOARD FLEXURE in mm 0 % 10 % 20 % 30 % 40 % 50 % 60 % 70 % 80 % 90 % 100 % |
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