Products / Interface Materials / Pads Pads In-Sil-8 RoHS Compliant! T-gardTM 500 RoHS Compliant! ThermalsilTMIIIRoHS Compliant! Thermal interface pads are thicker than double-sided tapes, but can be provided without adhesive if removal of the pad may be necessary. Pads can also be either electrically conductive or isolating. Performance of the interface pad is dependent on maintenance of correct, constant mounting pressure. In-Sil-8 Standard Pads When you need thermal conductance and electrical isolation in one package, In-Sil-8 Pads offer you the best of both. These silicone-based insulators come with thermally conductive fillers to isolate up to 6000 volts AC. In-Sil-8 pads withstand the rigors of assembly, harsh environments, and aging under continuous use. You'll save time with these cost-effective pads too: installation is 4 times faster than mica and grease, and they won't contaminate solder baths. Order In-Sil-8 Pads with or without pressure-sensitive adhesive, and in standard or custom shapes. Ordering Information In-Sil-8 pads have 12 digit ordering numbers. The 1st - 4th digits are listed in this chart, the 5th & 6th digits indicate standard configurations, and the last 6 digits are F00000. The 5th and 6th digit ordering codes along with the part dimensions are listed in the code column on the standard pads page. Part Numbers 1886 1887 1888 1889 (With adhesive factory (1896) (1897) (1898) (1899) applied to one side) Color Grey Rust Grey Grey Thickness (inch) 0.006 0.009 0.007 0.009 Thickness (mm) 0.15 0.23 0.18 0.23 0.33 1.25 0.77 0.50 1.50 1.16 Thermal Res. (C/W) TO-3 TO-220 TO-218 0.40 1.40 0.93 0.21 0.63 0.49 Breakdown Voltage 6000 5000 4000 5000 Dielectric Constant 5.5 4.5 5.5 5.5 T-gardTM 500 T-gardTM 500 is the recommended replacement for A-Dux T-gardTM500 is a medium thermal performance insulator pad consisting of a ceramic filled high temperature silicone rubber coated on electrical grade fiberglass. T-gardTM 500 is designed for applications that require additional thickness to prevent electrical shorts from stamped aluminum heatsinks used in switching mode power supplies (SMPS) and debris from aluminum castings used in automotive motor controls. T-gardTM 500 is used in applications that require interface of 2.5C/watt or higher on a TO-220 mounted @ 50 psi pressure. Electrical Properties Properties Test Method Metric Values Imperial Values Dielectric with stand voltage ASTM D149 4,500 volts AC 4,500 volts AC Dielectric Breakdown voltage ASTM D149 >6,000 volts AC >6,000 volts AC Volume Resistivity ASTM D257 >1012 ohm-cm >1012 ohm-in Dielectric Constant @ 1 MHz ASTM D257 3.3 3.3 Electrical RTI Temperature rating UL 746D 150C 302F Total Thermal Resistance Pressure, psi (kPa) Units 10 (69) 25 (172) 50 (345) 100 (689) 200 (1379) 400 (2758) Modified ASTM D5470 Cin2/ watt 0.6 0.55 0.45 0.40 0.35 0.35 Modified ASTM D5470 Ccm2/ watt 3.9 3.2 2.9 2.6 2.3 2.3 TO-220 C/ watt 2.9 2.6 2.4 2.2 2.0 2.0 Mechanical Properties Properties Test Method Thickness Metric Values Imperial Values 0.23 mm 0.009 inch Hardness ASTM D2240 85 Shore A 85 Shore A Tensile Strength ASTM D412 1.3 kpsi 9 mPa Elongation @45 to Warp/Fill ASTM D412 20% 20% Elongation along width or length ASTM D412 5% 5% Mechanical RTI Temperature rating UL 746D 150C 302F Dark Pink Dark Pink V-0 V-0 Color UL Flammability Rating UL 94 In-Sil-8 Standard sizes The standard sizes listed on this page are examples of some of the widely used hole patterns for In-Sil-8 Pads. Other shapes and hole patterns are available. For TO-3 For TO-66 Codes "A" Dim "B" Dim "C" Dim "D" Dim Codes "A" Dim "B" Dim "C" Dim "D" Dim 23 1.593 1.100 .156 .062 11 1.312 .762 .140 .062 05 1.650 1.140 .140 .093 30 1.250 .700 .140 .062 02 1.780 1.250 .140 .093 04 1.650 1.140 .122 .062 24 1.700 1.187 .156 .062 07 1.780 1.250 .165 .094 For TIP Packages For TO-220, TO-218 & TO-247 Codes "A" Dim "B" Dim "C" Dim "D" Dim Codes "A" Dim "B" Dim "C" Dim "D" Dim 65 1.260 .787 .984 .142 60 .437 .312 .140 .122 53 .865 .650 .650 .140 51 .687 .562 .218 .125 73 .984 .787 .708 .142 35 .710 .500 .160 .141 58 .750 .500 .187 .125 54 .750 .500 .187 .147 61 .750 .410 .225 .156 90 .860 .740 .200 .160 For Stud Mounted Devices Codes "A" Dim "B" Dim DO-4 22 20 DO-5 21 25 .625 .510 .200 .200 .800 1.000 .260 .260 To order a part with a factory applied pad, indicate the appropriate ordering code in the 8th position of the part number. The shape and hole pattern of the heat sink will determine the shape and hole pattern of the pad. If you are ordering a heat sink which mounts a semiconductor on both sides, the ordering code for two pads should be used. 8th position ordering codes 0 = No Pads 3 = One In-Sil-8 Pad 4 = Two In-Sil-8 Pads For TO-3 For TO-218 For TO-220