Products / Interface Materials / Pads
Pads
In-Sil-8 RoHS Compliant!
T-gardTM 500 RoHS Compliant!
Thermalsilâ„¢IIIRoHS 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
(With adhesive factory
applied to one side)
1886
(1896) 1887
(1897) 1888
(1898) 1889
(1899)
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
Thermal Res. (°C/W)
TO-3
TO-220
TO-218
0.40
1.40
0.93
0.21
0.63
0.49
0.33
1.25
0.77
0.50
1.50
1.16
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 2.5ºC/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 150ºC 302ºF
Total Thermal Resistance
Pressure,
psi (kPa) Units 10
(69) 25
(172) 50
(345) 100
(689) 200
(1379) 400
(2758)
Modified
ASTM
D5470
ºC-
in2/
watt 0.6 0.55 0.45 0.40 0.35 0.35
Modified
ASTM
D5470
ºC-
cm2/
watt 3.9 3.2 2.9 2.6 2.3 2.3
TO-220 ºC/
watt 2.9 2.6 2.4 2.2 2.0 2.0
Mechanical Properties
Properties Test
Method Metric
Values Imperial Values
Thickness 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 @45º to Warp/Fill ASTM D412 20% 20%
Elongation along width or
length ASTM D412 5% 5%
Mechanical RTI Temperature
rating UL 746D 150ºC 302ºF
Color Dark Pink Dark Pink
UL Flammability Rating UL 94 V-0 V-0
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
23 1.593 1.100 .156 .062
05 1.650 1.140 .140 .093
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
Codes "A" Dim "B" Dim "C" Dim "D" Dim
11 1.312 .762 .140 .062
30 1.250 .700 .140 .062
For TIP Packages For TO-220, TO-218 & TO-247
Codes "A" Dim "B" Dim "C" Dim "D" Dim
65 1.260 .787 .984 .142
53 .865 .650 .650 .140
73 .984 .787 .708 .142
Codes "A" Dim "B" Dim "C" Dim "D" Dim
60 .437 .312 .140 .122
51 .687 .562 .218 .125
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 .625
.510 .200
.200
DO-5 21
25 .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
