V18AUMLA1812WH データシートの表示（PDF） - Littelfuse, Inc
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V18AUMLA1812WH Datasheet PDF : 9 Pages
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AUML Varistor Series
Soldering Recommendations
The principal techniques used for the soldering of components in surface
mount technology are Infra Red (IR) Reflow, Vapour Phase Reflow, and
Wave Soldering. When wave soldering, the suppressor is attached to the
circuit board by means of an adhesive. The assembly is then placed on a
conveyor and run through the soldering process to contact the wave.
With IR and Vapour Phase Reflow, the device is placed in a solder paste
on the substrate. As the solder paste is heated, it reflows and solders the
unit to the board.
The recommended solder is a 62/36/2 (Sn/Pb/Ag), 60/40 (Sn/Pb), or
63/37 (Sn/Pb). Littelfuse also recommends an RMA solder flux.
Wave soldering is the most strenuous of the processes. To avoid the
possibility of generating stresses due to thermal shock, a preheat stage
in the soldering process is recommended, and the peak temperature of
the solder process should be rigidly controlled.
When using a reflow process, care should be taken to ensure that the chip
is not subjected to a thermal gradient steeper than 4 degrees per second;
the ideal gradient being 2 degrees per second. During the soldering
process, preheating to within 100 degrees of the solders peak temperature
is essential to minimize thermal shock. Examples of the soldering condi-
tions for the AUML Series of suppressors are given in the tables below.
Once the soldering process has been completed, it is still necessary to
ensure that any further thermal shocks are avoided. One possible cause of
thermal shock is hot printed circuit boards being removed from the solder
process and subjected to cleaning solvents at room temperature. The
boards must be allowed to gradually cool to less than 50oC before cleaning.
Termination Options
Littelfuse offers two types of electrode termination finish for the Multilayer
product series:
1. Silver/Platinum (standard)
2. Silver/Palladium (optional)
Previous
Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressor
3
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