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Conductive Adhesives - The High Tech Solution in Medical Electronics

Publisher: All Flex, Inc.

Format: PDF
Date: 2007-11-28

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All Flex, Inc.
White Papers

Overview:
This paper reviews the progress made in PTF technology with a focus on conductive adhesives and their use in medical solutions. It explains the additive method of applying conductors over subtrates in PTF circuits, and attributes the growth of PTF circuits to the rise of SMT. The features and applications of building block materials of PTF technology such as substrate, conductive inks, dielectrics, conductive adhesives, and non-conductive adhesives or encapsulants are outlined along with PTF processes such as fabrication, screen printing, curing, blanking, PTF assembly, and testing. Tape Automated Bonding (TAB) and Flip Chip or Direct Chip Attach package technology used in medical electronics are explained. Application of PTF circuits in blood oxygen sensors, stress sensor, RFID products are described, and the RFID technology is explained. The process of using isotropic and anisotropic conductive adhesive for flip-chip assembly is detailed. Advantages and limitations are also highlighted with case histories used for examples.

TABLE OF CONTENTS
1.	Introduction	2-3
2.	Polymer Thick Film Basics	3-6
2.1	Substrate	4
2.2	Inks	4
2.3	Dielectrics	4
2.4	Joining Materials - Conductive Adhesives	4-5
2.5	PTF Processes	5-6
3.	Micro Packaging Assembly with Conductive Adhesives	6-7
3.1	TAB (Tape Automated Bonding)	6
3.2	Flip Chip Technology	6-7
4.	Application and Case Histories	7
4.1	Blood Oxygen Sensors	7-8
4.2	Stress Sensor	9
4.3	RFID products & Markets	10
4.4	Building RFIDs	10-11
4.5	Isotropic Conductive Adhesive (ICA) Assembly	11-12
4.6	Anisotropic Conductive Adhesive (ICA) Assembly	12
5.	Conclusions & Summary	13
6.	Figures
6.1	PTF Products- PFC	3
6.2	PTF Products- PFC	3
6.3	Flip Chip from IBM	6
6.4	FC on PTF-Flex PVC	7
6.5	Poly-Flex Circuits/Nellcore Corp.	8
6.6	Blood Oxygen Sensor in Use	8
6.7	Stress Sensor	9
6.8	Sensor with Adhesively-Bonded Component	9
6.9	Printed Antenna PFC	11-12
6.10	Polymer Dip Chip	12
6.11	ACA	13