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B32912B3154M289 Datasheet(PDF) 10 Page - EPCOS |
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B32912B3154M289 Datasheet(HTML) 10 Page - EPCOS |
10 / 14 page Topic Safety information Reference chapter "Mounting guidelines" Soldering Do not exceed the specified time or temperature limits during soldering. 1 "Soldering" Cleaning Use only suitable solvents for cleaning capacitors. 2 "Cleaning" Embedding of capacitors in finished assemblies When embedding finished circuit assemblies in plastic resins, chemical and thermal influences must be taken into account. Caution: Consult us first, if you also wish to embed other uncoated component types! 3 "Embedding of capacitors in finished assemblies" Design of EMI Capacitors EPCOS EMI capacitors use polypropylene (PP) film metalized with a thin layer of Zinc (Zn). The following key points have made this design suitable to IEC/UL testing, holding a minimum size. Overvoltage AC capability with very high temperature Endurance test of IEC60384-14 (3rd edition, 2005-07) / UL60384-14 (1st edition, 2009-04) must be performed at 1.25 × V R at maximum temperature, during 1000 hours, with a capacitance drift less than 10%. Higher breakdown voltage withstanding if compared to other film metallizations, like Aluminum. IEC60384-14 (3rd edition, 2005-07) / UL60384-14 (1st edition, 2009-04) establishes high voltage tests performed at 4.3 × V R 1 minute, impulse testing at 2500 V for C= 1 µF and active flammability tests. Damp heat steady state: 40 °C/ 93% RH / 56 days. (without voltage or current load) Effect of humidity on capacitance stability Long contact of a film capacitor with humidity can produce irreversible effects. Direct contact with liquid water or excess exposure to high ambient humidity or dew will eventually remove the film metallization and thus destroy the capacitor. Plastic boxed capacitors must be properly tested in the final application at the worst expected conditions of temperature and humidity in order to check if any parameter drift may provoke a circuit malfunction. In case of penetration of humidity through the film, the layer of Zinc can be degraded, specially under AC operation (change of polarity), accelerated by the temperature, provoking an increment of the serial resistance of the electrode and eventually a reduction of the capacitance value. For DC operation, the parameter drift is much less. Plastic boxes and resins can not protect 100% against humidity. Metal enclosures, resin potting or coatings or similar measures by customers in their applications will offer additional protection against humidity penetration. B32911 ... B32916 X1 / 330 V AC Page 10 of 14 Please read Cautions and warnings and Important notes at the end of this document. |
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