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B32572 Datasheet(PDF) 11 Page - TDK Electronics

Part No. B32572
Description  Film Capacitors Metallized Polyester Film Capacitors (MKT)
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Manufacturer  TDK [TDK Electronics]
Direct Link  http://www.tdk.com
Logo TDK - TDK Electronics

B32572 Datasheet(HTML) 11 Page - TDK Electronics

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General notes on soldering
Permissible heat exposure loads on film capacitors are primarily characterized by the upper cate-
gory temperature Tmax. Long exposure to temperatures above this type-related temperature limit
can lead to changes in the plastic dielectric and thus change irreversibly a capacitor's electrical
characteristics. For short exposures (as in practical soldering processes) the heat load (and thus
the possible effects on a capacitor) will also depend on other factors like:
Pre-heating temperature and time
Forced cooling immediately after soldering
Terminal characteristics:
diameter, length, thermal resistance, special configurations (e.g. crimping)
Height of capacitor above solder bath
Shadowing by neighboring components
Additional heating due to heat dissipation by neighboring components
Use of solder-resist coatings
The overheating associated with some of these factors can usually be reduced by suitable coun-
termeasures. For example, if a pre-heating step cannot be avoided, an additional or reinforced
cooling process may possibly have to be included.
EPCOS recommends the following conditions:
Pre-heating with a maximum temperature of 110
Temperature inside the capacitor should not exceed the following limits:
MKT 160
When SMD components are used together with leaded ones, the leaded film capacitors should
not pass into the SMD adhesive curing oven. The leaded components should be assembled af-
ter the SMD curing step.
Leaded film capacitors are not suitable for reflow soldering.
Uncoated capacitors
For uncoated MKT capacitors with lead spacings
≤10 mm (B32560/B32561) the following mea-
sures are recommended:
pre-heating to not more than 110
°C in the preheater phase
rapid cooling after soldering
B32572, B32573
Ignition (stacked) SilverCapTM
Page 11 of 19
Please read Cautions and warnings and
Important notes at the end of this document.

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