HMC441 Datasheet, PDF (7/8 Pages) Hittite Microwave Corporation – GaAs PHEMT MMIC MEDIUM POWER AMPLIFIER, 6.0 - 18.0 GHz

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MICROWAVE CORPORATION
HMC441
GaAs PHEMT MMIC MEDIUM
POWER AMPLIFIER, 6.0 - 18.0 GHz
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Mounting & Bonding Techniques for Millimeterwave GaAs MMICs
The die should be attached directly to the ground plane eutectically or with conductive epoxy (see HMC general Han-
dling, Mounting, Bonding Note).
50 Ohm Microstrip transmission lines on 0.127mm (5 mil) thick alumina thin film substrates are recommended for
bringing RF to and from the chip (Figure 1). If 0.254mm (10 mil) thick alumina thin film substrates must be used, the
die should be raised 0.150mm (6 mils) so that the surface of the die is coplanar with the surface of the substrate. One
way to accomplish this is to attach the 0.102mm (4 mil) thick die to a 0.150mm (6 mil) thick molybdenum heat spreader
(moly-tab) which is then attached to the ground plane (Figure 2).
Microstrip substrates should brought as close to the die as possible in order to minimize bond wire length. Typical die-
to-substrate spacing is 0.076mm to 0.152 mm (3 to 6 mils).
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