Technical Data October, 2009 3M XYZ / Isotropic Electrically Conductive Adhesive Transfer Tape 9709S / 9709 SL Product Description 3M Electrically Conductive Adhesive Transfer Tape 9709S is a pressure sensitive adhesive (PSA) transfer tape with isotropic electrical conductivity. The PSA matrix is filled with conductive fillers which allow interconnection between substrates through the adhesive thickness (the Z-axis) and also provides electrical conductivity in the plane of the adhesive (X-Y Axis). The PSA tack and adhesion properties allow for room temperature application and assembly processes. Tape 9709S has inherent EMI shielding capability. Tape 9709S provides an electrical connection and adhesively bonds EMI/RFI shields and gaskets to metal frames and enclosures. The low contact resistance and tape construction result in good EMI performance. Tape 9709S can be applied as die cut parts or in roll form. Tape 9709S offers good XYZ electrical conductivity performance with good adhesion. As Tape 9709S has inherent EMI shielding performance, it can enhance existing shielding solutions, offer new design options and improve Faraday gage designs. Tape 9709S can offer lower contact resistance to hard surfaces or surfaces with oxide layers, such as to stainless steel as compared to the Tape 9709. As each application is unique, it is important for users of the Tape 9709S to evaluate which will work best given their product design. In some designs, Tape 9709 may perform effectively equivalently to Tape 9709S in EMI shielding as a final design is electromagnetic interference compatibility (EMC) tested as a completed assembly. 3M Electrically Conductive Adhesive Transfer Tape 9709SL is a premium low release liner version of Tape 9709S. The Tape 9709S standard release liners (PET/PET) offer good release properties from many common surfaces. In applications where very low liner release is desired, the Tape 9709SL version offers a set of premium low release liners (PET/PCK Paper). As in all conductive PSA applications, stable electrical performance in any electrical connection application may require added mechanical reinforcement (clamping or compressing) in the bond area. Construction Property Value Adhesive Type Filled Acrylic Pressure Sensitive Release Liner Tape 9709S Std PET/PET Liners Tape 9709SL Premium Low Release PET/PCK Paper Liner Approximate Thickness Adhesive 2 mil (50 m) Tape 9709S Liner(s) 2 mil (50 m) / 1.5 mil (35 m) Tape 9709SL Premium 2 mil (50 m) PET / Low Release Liner(s) 4 mil (100 m) PCK Paper Note: Tapes 9709S and 9709SL: Tight Side / Easy Side Release 3 3M XYZ / Isotropic Electrically Conductive Adhesive Transfer Tape 9709S / 9709SL 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: (Test Method is based on a modified ASTM D3330, 12 ipm peel rate, 1 in. width, 2 mil PET backing, 180 degree) Dwell Time Room Temperature 1 Hour 24 Hours 23C 29 oz./in. (3.2 N/cm) 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. 1 Temperature Performance Application Use Temperatures: -40 to +85C Varies with application design. See Note 1. See also the Application section of this document Shelf Life and Storage Tape in roll form: Shelf life 24 months from the date of manufacture when stored in original cartons at 21C (70F) and 50% relative humidity. Electrical Properties: 3 2 Current Carrying Capacity Estimated: 1.0 Amps/in Z-Axis Resistance 1 Hr dwell, <0.5 ohms 1,2,4,5 2mm x 5mm contact area Minimum Overlap Area Application dependent Thermal Performance: Apparent Thermal Conductivity 0.6 - 0.7 W/mk 1. Application use temperature range of the 3M XYZ/Isotropic Electrically Conductive Adhesive Transfer Tape 9709S and 9709SL may be increased or have improved reliability with the use of a mechanical clamping system as determined by the end use customer. The temperature use range is dictated by two primary items: Temperature performance of the acrylic adhesive (generally in the range of -40C to about 95C 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 good performance of the Tape 9709S and 9709SL 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, etc. (See section on mechanical clamping for added information). 2. Two wire resistance measurement (a 4 wire test would generally be lower). The Z axis test uses a test PCB with gold traces or pads that are 2mm wide. The ECATT tape is laminated to a polyimide or PET flex with a gold plating. The ECATT is laminated to the flex to cover about 50% of the flex surface. The flex/ECATT is bonded to the PCB gold pad and the opposite (non- ECATT end) is placed into contact with another gold PCB trace to make an electrical contact. Contact R is measured between the two PCB pads of the flex to infer a relative contact R of the ECATT product based on this test method and surfaces used. 3. Estimated. Customers are required to qualify the maximum current capability for their application. 4. Minimum suggested conductor overlap area (pad area) in the interconnection of individual circuit lines to ensure Z-Axis conduction must be optimized for each application and environmental and mechanical design conditions. 5. Z & XY conductivity end use and testing results will vary based on many factors such as, but not limited to: End use design, environmental conditions, aging environment, test methods, interface material types & compatibility, product lot to lot & with-in lot variability, XY span, surface features & topagraphy, area, surface preparation, etc. Available Sizes Slit Tape Width Standard Length Maximum Length 1.0 to 12 inch 36 yds. 108 yds. (25 mm to 354 mm) (32.9 m) (98.8 m) Normal Slitting Tolerance 0.065 in. (0.8 mm) (2)