HMC347(V02) 데이터 시트보기 (PDF) - Hittite Microwave
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HMC347 Datasheet PDF : 6 Pages
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MICROWAVE CORPORATION
v02.0404
HMC347
GaAs MMIC SPDT NON-REFLECTIVE
SWITCH, DC - 20.0 GHz
Assembly Diagram
7
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 bring-
ing 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).
7 - 30
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