Datasheet HMC634 (Analog Devices) - 8

HMC634
v01.0308
GaAs PHEMT MMIC DRIVER AMPLIFIER, 5 - 20 GHz 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 Handling, Mounting, Bonding Note). 0.102mm (0.004”) Thick GaAs MMIC 2 50 Ohm Microstrip transmission lines on 0.127mm (5 mil) thick alumina Ribbon Bond thin fi lm substrates are recommended for bringing RF to and from the chip 0.076mm (Figure 1). If 0.254mm (10 mil) thick alumina thin fi lm substrates must be (0.003”) IP used, the die should be raised 0.150mm (6 mils) so that the surface of H the die is coplanar with the surface of the substrate. One way to accom- plish this is to attach the 0.102mm (4 mil) thick die to a 0.150mm (6 mil) RF Ground Plane thick molybdenum heat spreader (moly-tab) which is then attached to the - C ground plane (Figure 2). S Microstrip substrates should brought as close to the die as possible in R order to minimize bond wire length. Typical die-to-substrate spacing is 0.127mm (0.005”) Thick Alumina Thin Film Substrate IE 0.076mm to 0.152 mm (3 to 6 mils). Figure 1. IF
Handling Precautions
L 0.102mm (0.004”) Thick GaAs MMIC P Follow these precautions to avoid permanent damage. M
Storage:
All bare die are placed in either Waffle or Gel based ESD protec- Ribbon Bond tive containers, and then sealed in an ESD protective bag for shipment. 0.076mm Once the sealed ESD protective bag has been opened, all die should be (0.003”) K A stored in a dry nitrogen environment.
Cleanliness:
Handle the chips in a clean environment. DO NOT attempt OC to clean the chip using liquid cleaning systems. RF Ground Plane
Static Sensitivity:
Follow ESD precautions to protect against ESD BL strikes. 0.150mm (0.005”) Thick Moly Tab IN
Transients:
Suppress instrument and bias supply transients while bias 0.254mm (0.010” Thick Alumina A is applied. Use shielded signal and bias cables to minimize inductive Thin Film Substrate pick-up. Figure 2.
General Handling:
Handle the chip along the edges with a vacuum collet or with a sharp pair of bent tweezers. The & G surface of the chip has fragile air bridges and should not be touched with vacuum collet, tweezers, or fi ngers. R
Mounting
E The chip is back-metallized and can be die mounted with AuSn eutectic preforms or with electrically conductive epoxy. IV The mounting surface should be clean and fl at. R Eutectic Die Attach: A 80/20 gold tin preform is recommended with a work surface temperature of 255 °C and a tool D temperature of 265 °C. When hot 90/10 nitrogen/hydrogen gas is applied, tool tip temperature should be 290 °C. DO NOT expose the chip to a temperature greater than 320 °C for more than 20 seconds. No more than 3 seconds of scrubbing should be required for attachment. Epoxy Die Attach: Apply a minimum amount of epoxy to the mounting surface so that a thin epoxy fi llet is observed around the perimeter of the chip once it is placed into position. Cure epoxy per the manufacturer’s schedule.
Wire Bonding
Ball or wedge bond with 0.025mm (1 mil) diameter pure gold wire. Thermosonic wirebonding with a nominal stage temperature of 150 °C and a ball bonding force of 40 to 50 grams or wedge bonding force of 18 to 22 grams is recom- mended. Use the minimum level of ultrasonic energy to achieve reliable wirebonds. Wirebonds should be started on the chip and terminated on the package or substrate. All bonds should be as short as possible <0.31mm (12 mils). Information furnis F heod r pri by An ce, de alog Devi lcievs eir s y b , a eliev nd to pla ed to be accu ce o rate anrder d relia sbl, pl e. H ease co owever, no For price, delivery, and to place orders: Analog Devices, Inc., responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other ntact Hittite Microwave Corporation: One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106 20 Alpha Road, Chelmsford, MA 01824 Phone: 978 rights of third parties that may result from its use. Specifications subject to change without notice. No Pho - n25 e 0 : 7 - 81 3 - 3 32 4 9-3 F 470 ax: 978 0 • Orde - r o 25 nlin 0- e a 3 t 373 license is granted by implication or otherwise under any patent or patent rights of Analog Devices. www.analog.com
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