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PEH200UM4330MB2 Datasheet(PDF) 11 Page - Kemet Corporation |
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PEH200UM4330MB2 Datasheet(HTML) 11 Page - Kemet Corporation |
11 / 13 page 11 © KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com A4034_PEH200 • 3/30/2016 Screw Terminal Aluminum Electrolytic Capacitors – PEH200 Series, +85°C Extended cathode Anode foil Cathode foil Tissues Foil tabs Aging Etching Forming Winding Decking Impregnation Assembly Testing Sleeving Packing Construction Data The manufacturing process begins with the anode foil being electrochemically etched to increase the surface area and then “formed” to produce the aluminum oxide layer. Both the anode and cathode foils are then interleaved with absorbent paper and wound into a cylinder. During the winding process, aluminum tabs are attached to each foil to provide the electrical contact. The deck, complete with terminals, is attached to the tabs and then folded down to rest on top of the winding. The complete winding is impregnated with electrolyte before being housed in a suitable container, usually an aluminum can, and sealed. Throughout the process, all materials inside the housing must be maintained at the highest purity and be compatible with the electrolyte. Each capacitor is aged and tested before being sleeved and packed. The purpose of aging is to repair any damage in the oxide layer and thus reduce the leakage current to a very low level. Aging is normally carried out at the rated temperature of the capacitor and is accomplished by applying voltage to the device while carefully controlling the supply current. The process may take several hours to complete. Damage to the oxide layer can occur due to variety of reasons: • Slitting of the anode foil after forming • Attaching the tabs to the anode foil • Minor mechanical damage caused during winding A sample from each batch is taken by the quality department after completion of the production process. This sample size is controlled by the use of recognized sampling tables defined in BS 6001. The following tests are applied and may be varied at the request of the customer. In this case the batch, or special procedure, will determine the course of action. Electrical: • Leakage current • Capacitance • ESR • Impedance • Tan Delta Mechanical/Visual: • Overall dimensions • Torque test of mounting stud • Print detail • Box labels • Packaging, including packed quantity |
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