3M™ Electrically Conductive Adhesive Transfer Tape (ECATT) 9703 is a pressure sensitive adhesive (PSA)
transfer tape with anisotropic electrical conductivity. The PSA matrix is filled with conductive particles which
allow interconnection between substrates through the adhesive thickness (the “Z-axis”) but are spaced far
enough apart for the product to be electrically insulating in the plane of the adhesive. The PSA tack properties
and lack of any thermal curing make 3M ECATT 9703 easy to use in assembly operations.
3M ECATT 9703 electrically connects and mechanically bonds medium pitch flexible circuits with other
flexible circuits (flex), rigid printed circuit boards (PCB) or LCD screens. 3M ECATT 9703 is electrically
conductive and offers good adhesion to common PCB substrates such as copper, gold, FR-4 epoxy, DuPont™
Kapton™ polyimide and polyester films. Stable electrical performance in any flexible circuit interconnection
application may require mechanical reinforcement (clamping).
3M ECATT 9703 also electrically connects and mechanically bonds EMI/RFI shield and gaskets to metal
frames and enclosures. The low contact resistance and tape construction result in good EMI performance.
3M ECATT 9703 can be applied as die cut parts or in roll form and has good adhesion to common EMI/RFI
substrates such as aluminum, stainless steel, and smooth gasket materials.
Product Construction
Property
Adhesive Type
Release Liner
Approximate Thickness
Adhesive
Liner
2 mil (50 µm)
4 mil (100 µm)
Value
Filled Acrylic Pressure Sensitive
Silicone Treated Polycoated Kraft Paper
3M
™
Electrically Conductive Adhesive Transfer Tape 9703
Typical Physical Properties and Performance Characteristics
Note:
The following technical information and data should be considered representative or typical only and
should not be used for specification purposes.
Adhesive Properties:
Peel Adhesion to Stainless Steel:
Tested in accordance with a modified ASTM D3330 test method, 12 ipm peel rate, 1 in. width, 2 mil PET backing, 180 degree)
Dwell Time @ Room Temperature
23°C
1 Hour
29 oz./in. (3.2 N/cm)
24 Hours
32 oz./in. (3.5 N/cm)
Note: Peel
values will often be higher than noted above when using a non-PET backing. Different backing types effect the
backing modulus, thickness and stiffness and these differences directly effect the peel test result value. As an example, a
2 mil aluminum backing will change the test value of the peel adhesion as the peel back angle at the interface will change
due to the backing stiffness. A 2 mil aluminum backing would generally increase the peel values.
Temperature Performance
1
Application Use Temperatures:
-40 to +85°C in a properly designed end use application. See Note 1.
Application Storage Temperatures:
See “Shelf Life and Storage” comments. End user needs to qualify converted material for a
broader storage environmental range.
See also the Application section of this document
125°C, 24 hrs, 2 x 10
-6
Torr vacuum
Total Mass Loss (TML)
Collected Volatile Condensable Materials (CVCM)
Outgassing:
(NASA SP-R-0022 or ASTM E595)
0.7%
0.01%
Electrical Properties:
Insulation Resistance
2,3
Contact Resistance
1
Minimum Gap
4
Minimum Overlap Area
5
Apparent Thermal Conductivity
6
3.4 x 10
14
ohms/square (estimated based on 3M™ Electrically Conductive Adhesive
Transfer Tape 9703)
< 0.3 ohms (3M Test Method, Gold PI Flex onto Gold PCB, RT Initial R, 6 mm
2
)
15 mil (0.4 mm)
5000 mil
2
(3.2 mm
2
)
0.16-0.20 W/mK
1.
The final assembly must be tested to verify that the 3M™ Electrically Conductive Adhesive Transfer Tape 9703 can achieve the desired performance in
the assembly’s end use application environmental conditions (temperature, humidity, temperature cycling, shock, application assembly design, assembly
variation, etc.). 3M ECATT 9703 may achieve the -40 to +85°C temperature range (or broader temperature range excursions) in an end use application
if the final assembly design is designed so that the conductive particles remain in sufficient mechanical contact between surfaces to achieve the desired
contact resistance. Some type of mechanical bond line compression design as determined by the end use customer (clip, clamp, screw, compressed foam,
etc.) that will apply a constant minimum pressure across the bond line may be required to meet the desired end use environmental ranges and contact
resistance specification. The temperature use range is dictated by two primary items: Temperature performance of the acrylic adhesive (generally in the
range of -40°C to about 95°C depending on other environmental conditions) as it supports the conductive particles in the adhesive/ particle matrix and the
potential movement of the conductive fillers in the adhesive system in an end use application design. Items contributing to the performance of the Tape
9703 for resistance level performance include, but are not limited to: assembled bond line force (constant force present across the bond line after assembly
and over the life of the product), types of substrates bonding, surface features in bonded area, environmental conditions, (temperature, humidity, CTE,
shock, environmental cycling, etc.), assembly surfaces and 3M ECATT 9703 compatibility, 3M ECATT 9703 filler and assembly surfaces galvanic potential
compatibility, etc. (See section on mechanical clamping for added information).
2.
Tested in accordance with ASTM D-257 test method.
3.
Estimate based on 3M™ Electrically Conductive Adhesive Transfer Tape 9703 test data.
4.
Minimum free space between adjacent conductors suggested to ensure electrical isolation. Customers may qualify finer pitch performance in their
applications.
5.
Minimum recommended conductor overlap area (pad area) in the interconnection of individual circuit lines to ensure Z-Axis conductio.
6.
Tested in accordance with a modified ASTM D5470 thermal test method.
(2)
3M
™
Electrically Conductive Adhesive Transfer Tape 9703
Available Sizes
Slit Tape Width
0.25 to 0.5 inch
(6.9 to 13 mm)
0.5 to 12 inch*
(13 to 354 mm)
Normal Slitting Tolerance
*Contact
your 3M Technical Service Engineer for rolls wider than 12 inches.
Standard Length
36 yds.
(32.9 m)
36 yds.
(32.9 m)
0.03125 in.
(0.8 mm)
Maximum Length
36 yds.
(32.9 m)
108 yds.
(98.8 m)
Application Techniques
Bonding
• To obtain maximum adhesion, the bonding surfaces must be clean and dry.
• Pressure must be applied to the bond line after assembly to wet the substrates with 3M™ Electrically
Conductive Adhesive Transfer Tape (ECATT) 9703 and to engage the conductive particles with the
substrates to make electrical connection. Mechanical pressure (roller, metal bar) or finger pressure at 15 psi
(0.10 Mpa) or greater is suggested. Heat may be applied simultaneously to improve wetting and final bond
strength.
• 3M ECATT 9703 should be applied between 60°F - 158°F (15°C - 70°C). Tape application below 50°F
(10°C) is not recommended because the adhesive will be too firm to wet the surface of the substrate,
resulting in low adhesion.
• Adhesion builds with time, up to 24 hours may be required to reach final adhesion values.
Mechanical Clamping
To assure electrical resistance stability of 3M ECATT 9703 in any flexible circuit interconnection application,
a mechanical clamp or other compressive force (i.e. foam strip held in compression over bond area.) should
be considered in the design of the application. Any stress inherent in the assembly design (i.e. tensile, shear,
cleavage) or temperature excursions (encountered through normal product use) applied to the bond area
could result in an electrical open in the bonded circuit over time when no clamp or mechanism for maintaining
a constant compressive forces is used. A well designed mechanical clamp will reduce the environmental
stress on the bond line and improve the electrical reliability of the bond. In addition, the temperature operating
range for the adhesive can be improved with a properly designed mechanical clamping system to ensure
the conducting particles in the 3M ECATT 9703 maintain electrical contact. Several types of mechanical
clamps have been used successfully including foam strips attached to lids or cases and screw-attached plastic
clamps. Contact your 3M Technical Service Engineer for further information about mechanical clamping.
(3)
3M
™
Electrically Conductive Adhesive Transfer Tape 9703
Application Techniques
(continued)
Temperature Performance
The electrical performance of 3M™ Electrically Conductive Adhesive Transfer Tape (ECATT) 9703 is more
sensitive to temperature than the peel performance. 3M ECATT 9703 is not recommended for high or low
temperature excursions where the electrical performance might be compromised, even if holding power is
not affected. The user is responsible for the temperature performance qualification of 3M ECATT 9703 in
their design. Contact your 3M Technical Service Representative for further information about the temperature
performance of 3M ECATT 9703.
Rework
Mechanically separate the parts using torque for rigid parts and peel for flexible ones. Remove the adhesive
by rubbing it off with a Scotch-Brite
®
Hand Pad, clean up the site and apply new adhesive. The force needed
to separate the parts and/or remove the adhesive can be reduced by softening the adhesive by heating 158°F
- 212°F (70°C - 100°C) or using solvents.*
*Note:
When using solvents, be sure to follow the manufacturer’s precautions and directions for use
when handling such materials.
General Information
3M ECATT 9703 is part of a family of anisotropic (Z-Axis) conductive tapes and thermoset films. For
applications where mechanical clamping is not desired, or where improved electrical, thermal and mechanical
performance is required, these alternative products should be considered.
Application Ideas
3M™
Electrically Conductive Adhesive Transfer Tape (ECATT) 9703 is ideal for interconnection of flexible
circuits with other flexible circuits (flex), rigid printed circuit boards (PCB) or LCD screens. Applications include
polyester flex circuit splicing, keyboard manufacturing, LCD assembly and many others. 3M ECATT 9703 is
also ideal for EMI/RFI shield and gasket attachment applications. Applications include EMI shields for displays
and gasket attachment to EMI/RFI cabinets and enclosures.
(4)
3M
™
Electrically Conductive Adhesive Transfer Tape 9703
Certificate of Analysis (COA):
The 3M Certificate of Analysis (COA) for this product is established when the product becomes commercially
available from 3M. The Technical Data Sheet (TDS) technical information, test methods and data should be
considered representative or typical only and should not be used for specification purposes. The Technical
Data Sheet (TDS) information is based on a limited set of test results and do not reflect the COA specification
limits. Final product specifications and associated manufacturing facility testing methods used for the
commercialized product are outlined in the products Certificate of Analysis (COA) that is provided upon
request or with the products shipment.
The COA contains the 3M specifications and test methods for the products performance limits that the
product will be supplied against. The 3M product is supplied to 3M COA test specifications and the COA
test methods. Inquire with 3M for the COA for this product.
Storage and Shelf Life
The shelf life of 3M™ Electrically Conductive Adhesive Transfer Tape 9703 is 24 months from the shipment
date from the manufacturing location when stored in original packaging at 21°C (70°F) and 50% relative
humidity.
Safety Data Sheet: Consult
Safety Data Sheet before use.
Regulatory:
For regulatory information about this product, contact your 3M representative.
Technical Information: The
technical information, recommendations and other statements contained in this document are based upon
tests or experience that 3M believes are reliable, but the accuracy or completeness of such information is not guaranteed.
Product Use: Many
factors beyond 3M’s control and uniquely within user’s knowledge and control can affect the use and performance
of a 3M product in a particular application. Given the variety of factors that can affect the use and performance of a 3M product, user
is solely responsible for evaluating the 3M product and determining whether it is fit for a particular purpose and suitable for user’s
method of application.
Warranty, Limited Remedy, and Disclaimer: Unless
an additional warranty is specifically stated on the applicable 3M product
packaging or product literature, 3M warrants that each 3M product meets the applicable 3M product specification at the time 3M ships
the product. 3M MAKES NO OTHER WARRANTIES OR CONDITIONS, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
ANY IMPLIED WARRANTY OR CONDITION OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR ANY IMPLIED
WARRANTY OR CONDITION ARISING OUT OF A COURSE OF DEALING, CUSTOM OR USAGE OF TRADE. If the 3M product does
not conform to this warranty, then the sole and exclusive remedy is, at 3M’s option, replacement of the 3M product or refund of the
purchase price.
Limitation of Liability:
Except where prohibited by law, 3M will not be liable for any loss or damage arising from the 3M product,
whether direct, indirect, special, incidental or consequential, regardless of the legal theory asserted, including warranty, contract,
negligence or strict liability.
Electronics Materials Solutions Division
3M Center, Building 224-3N-11
St. Paul, MN 55144-1000
1-800-251-8634 phone
651-778-4244 fax
www.3M.com/electronics
3M is a trademark of 3M Company.
Scotch-Brite is a registered trademark of 3M Company.
DuPont and Kapton are trademarks of E. I. du Pont de
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