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P.F.D., Inc.
1. SOLDERING AND THERMAL CONSIDERATIONS
P.F.D., Inc. Ceramic dielectric resonators are suitable for surface
mount soldering via standard production techniques. These components are susceptable
to thermal shock fracture in both heating and cooling. A maximum heating and
cooling rate of 90C per minute is recommended. Limit maximum soldering temperature
to 250C for 1 minute. Resonators may be hand soldered if first pre-heated to
approximate soldering temperature. Mildly activated rosin (RMA) fluxes are
sufficiently active to insure reliable, soldering.
Since copper electrode solubility
is very low, the use of silver bearing solder
alloys to minimize leaching is not required, and maximum soldering time at
temperature is relatively non-critical.
When soldering low frequency, large profile components (8mm and up), an additional
concern is the thermal expansion mis-match between substrate and component.
Contact the factory for thermal expansion data.
2. HANDLING PRECAUTIONS
P.F.D., Inc. Ceramic dielectrics are subject to mechanical damage from
shock to the inherently brittle ceramic. Edge chips may develop, or in severe
cases a crack may be induced, rendering the component inoperative. Small edge
chips or electrode loss extending up to .020" from the open end will have
no effect on operation so long as frequency remains within specification. Any
electrode loss on the closed end will adversely affect performance and should
be limited to .005" maximum. Resonators are supplied to these limits.
3.
ADJUSTING FREQUENCY
Common techniques include removing electrode and /or ceramic dielectric by
grinding a chamfer at or near the unmetallized end to raise the self resonant
frequency. Care must be taken to make clean cuts of electrode material and
to avoid chipping or cracking the edge of the dielectric material. Small adherent
chips may come loose at a later stage of assembly or usage thereby raising
the self resonant frequency of the device. The best results are obtained by
using diamond loaded wheels with the direction of tool rotation such that the
removed material is ejected towards the tab.
Side view of preferred grinding technique:
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4.STORAGE
Silver is subject to tarnishing from sulfur bearing materials. Parts are supplied
with a tarnish inhibiting coating to reduce storage effects. Keep stock in
sealed plastic bags or jars. Tarnished components may require fully activated
rosin (RA) or organic acid (OA) flux to obtain satisfactory soldering.
WORK/SPEC - ORDERING INFORMATION-SAMPLE
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Val Jackson + Associates,
Inc.
818 N. Barr Rd. Port Angeles, WA 98362
Tel: 360.452.7308 • Cell:
831.252.4216 • Fax: 360.452.7306
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