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1998 Mar 23 2
Philips Semiconductors
RF transmitting transistor and
power amplifier fundamentals RF and microwave
transistor packages
material since it combines good thermal conductivity
(250 W/mK) with good electrical isolation. A disadvantage
of BeO is that it is toxic. So, in line with Philips’ policy to
eliminate toxic and environmentally harmful substances
from its products, packages with aluminiumnitride (AIN)
heat-spreaders have been developed - the slightly lower
thermal conductivity of AIN being compensated for by
using thinner ceramic.
The first ceramic packages incorporated a copper stud or
flange brazed to the bottom of the heat-spreader. Since
there is considerable mismatch between the thermal
coefficients of expansion (TCE) of copper and beryllia, the
contact area must be limited to prevent the heat-spreader
from cracking. Larger (higher power) packages (e.g.
SOT121 and SOT171) were therefore designed using a
copper pedestal to which the heat-spreader was attached
(brazed) with the die on top. The pedestal allows a larger
heat-spreader (and hence die) to be used whilst
maintaining the metal-to-ceramic contact area well below
the practical limit. Even with this design, however, the size
of the heat-spreader is limited as only the region directly
above the pedestal has a low thermal resistance, and thus
conducts heat effectively. Those areas of a transistor die
and heat-spreader extending beyond the top of the
pedestal have a higher thermal resistance. Nevertheless,
since such packages can be mounted directly onto a
heatsink in the application, the power handling, though still
restricted, is much better than that of the standard design.
This type of package (with or without pedestal) is sealed by
epoxy-glueing a ceramic cap to the top of the package.
Though forming a high-quality reliable seal, epoxy resin
does not provide a hermetic barrier. To ensure that the
package is completely sealed and that there are no
pinholes in the epoxy, the packages are tested for gross
leaks. Note that all epoxy glues start to degrade at
temperatures close to 300 °C and, for long-term stability,
standard ceramic packages should not be exposed to
temperatures above about 150 °C. Short exposure to
higher temperatures is allowed (e.g. during reflow
soldering). In addition, during fluxing and cleaning,
minimize exposure to liquids, for example by dipping.
Though not strictly hermetic, all of Philips’ standard
ceramic packages contain glass-passivated transistor
dies. Effectively isolating the die from its surroundings,
glass passivation contributes to extremely high levels of
transistor reliability.
4.4 Ceramic packages with special flange
materials
As indicated above, the size of ceramic packages with
copper flanges is limited by the different TCEs of copper
and ceramic. This limitation was overcome by replacing
the copper by a material with a much lower TCE.
Nowadays, two materials are commonly used which
combine a much lower TCE with a still acceptable thermal
conductance:
– A tungsten-copper alloy (e.g. SOT262), and
– A copper-molybdenum-copper sandwich (e.g.
SOT468).
These materials allow the contact area between flange
and ceramic to be much larger while the ceramic can be
even thinner without increased risk of cracking. Since
these materials are at present very expensive, packages
with a copper flange remain in widespread use. For
improved RF grounding at high frequencies, flanged
packages with through-plated holes in the ceramic have
been developed.
Fig.4-2 Construction of a typical ceramic
package with flange.
handbook, halfpage
copper flange
ceramic heatspreader
die
metal bridge
connecting both
outer emitter leads
ceramic cap
epoxy glue
base
lead collector
lead
pedestal
leadframe connection
between both
outer emitter leads
soldered or
brazed region
MGM652