SM SERIES SURFACE MOUNT “DROP-ON” FILTERS
SM filters achieve true “drop-on” surface mount performance without sacrificing
electrical characteristics. The uniquepackage design installs onto microstrip
or into other substrate configurations. The filter body acts as an electrical
barrier,effectively isolating the input and output. Resulting isolation
values can be as large as 80 dB but will not be lower than 60 dB if the
substrate provides ground over the filter body contact surface. Higher
isolation can be achieved if contact is also provided to the top of the
filter.
The RF pins are solder plated Kovar, while the ground pins are silver
plated soft copper. Thus, the ground pins can absorb thermal differences
and deformation which occur during installation. Both RF and ground pins
meet MIL solderability requirements. The packages are finished with silver
plating to MIL-QQ-365 but are available with Rhodium or Gold flash to guarantee
long life and attractive cosmetics.
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Bandpass, Bandstop, Highpass , Lowpass
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0.150” thickness (SM-1 series) to
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0.400” thickness (SM-4 series)
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High isolation when installed into circuit board (at least 60 dB)
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Pins “flex” to absorb temperature differentials
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Pins meet MIL solderability
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Surface finish enables good grounding
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Packages are sealed and com- pensated to comply with full MIL environmental
range
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Efficient High-Q circuits include lumped and evanescent designs (Q from
80 to 500)
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Bandwidths to 80%
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10 MHz to 10 GHz
DIMENSIONS (Inches)
“A” dimension is approximate and is given in terms of N, the number of
sections.
Tolerances: A, B, C, F are +/- .01 ; D, E
are +/- .005
|
A LENGTH |
B THICKNESS |
C WIDTH |
D |
E |
F |
| SM-1 |
.25N |
.15 |
.40 |
A-.16 |
.260 |
.20 |
| SM-2 |
.25N |
.27 |
.60 |
A-.16 |
.440 |
.30 |
| SM-3 |
.25N |
.30 |
.45 |
A-.16 |
.290 |
.23 |
| SM-4 |
.25N |
.40 |
.75 |
A-.16 |
.590 |
.38 |
Other package sizes, pin configurations and text fixtures are available.