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Insulators – Mica and Thermalsil TM III
Mica and Thermalsil TM III
Thermalsil? III provides excellent thermal conductivity
and electrical resistance. It is used as an electrically-isolat-
ing interface material composed of silicone elastomer
binder with a thermally conductive filler. It is reinforced
FIGURE A
FIGURE B
with glass cloth to resist tearing and cut-through due to
burrs on transistors or heat sinks.
Thermalsil? III eliminates the need for grease application
and conforms to mounting surfaces under clamping pres-
sure for optimum heat conduction. The finely woven glass
cloth provides the thinnest possible matrix for enhanced
thermal resistance. Thermalsil? III is available in any con-
figuration with adhesive backing.
Mica insulators provide high maximum operating temper-
atures (550 ° C) and excellent electrical properties.
"D"
DIA
TYP (2)
"C"
DIA
TYP (2)
1.83
(0.072)
"A"
30.15
(1.187)
10.92
(0.430) "B"
"D"
DIA
"C"
"A"
"B"
ORDERING INFORMATION
Part number
56-77-9G
56-03-2G
53-77-9G
53-03-2G
Description
Mica
Mica
Thermalsil TM III
Thermalsil TM III
Device
TO-220
TO-3
TO-220
TO-3
"A" Dim
18.42 (0.725)
42.04 (1.655)
18.42 (0.725)
42.04 (1.655)
"B" Dim
13.21 (0.520)
27.00 (1.063)
13.21 (0.520)
27.00 (1.063)
"C" Dim
4.32 (0.170)
3.96 (0.156)
4.32 (0.170)
3.96 (0.156)
"D" Dim
2.92 (0.115)
1.57 (0.062)
2.92 (0.115)
1.57 (0.062)
Figure
B
A
B
A
TYPICAL PROPERTIES FOR MICA INSULATORS
TYPICAL PROPERTIES FOR THERMALSIL TM III
Property
Electrical
Property
Typical value 25°C
Electrical
Test method
Dielectric strength
172 X 10 3 volts/mm (4500 volts/mil)
Dielectric constant
2.5@50 Hz
ASTM D-150
0.025 mm to 0.076 mm thick in air (1 to 3 mils thick in air)
2.5@10 3 Hz
Dielectric constant
6.5 to 8.7
2.5@10 6 Hz
Dissipation factor
0.0001-0.0004 @ 10 6 Hz
Dielectric breakdown voltage 26.3 x 10 3 volts/mm (667 volts/mil)
ASTM D-149
10 ohm-cm
Volume resistivity
Modules of elasticity in tension
Tensile strength
Hardness mohs, shore
Compressive strength
Specific gravity
Thermal conductivity
Coefficient of thermal expansion
Specific heat
Melting point
Max. operating temperature
15
Physical
172 X 10 3 Mpa (25 X 10 6 ) psi
310 Mpa (45,000 psi)
3.0, 115
2.21 X 10 8 Pa (32,000 psi)
2.9
Thermal
0.528 W/(m °C ) (0.30 Btu/hr-ft °F)
3.24 X 10 -5 °C (1.8 X 10 -5 °F)
0.084 KJ/Kg °C (0.02 Btu/Lb °F)
1275°C (2327 °F)
550 °C (1022 oF)
Volume resistivity
Dielectric dissipation factor
Thickness
Color
Tensile strength
Hardness, shore A
Elongation
Thermal conductivity
Flame resistance
5.7 x 10 15 ohm-cm
0.008@50 Hz
0.004 @10 3 Hz
0.004 @10 6 Hz
Physical
0.15mm
(0.006 inch)
Gray-Green
6.1 x 10 7 Pa (8786 psi)
87
2% or less
Thermal
0.92 W/(m °C ) (0.532 Btu/hr. ft °F)
UL 94V-0
ASTM D-257
ASTM D-150
UL card #E-58126 (S)
Service temperature
-60°C to 180°C
(-76°F to 356°F)
AMERICA
USA Tel: +1 (603) 224-9988 email: info@aavid.com
ASIA
Singapore Tel: +65 6362 8388 email: sales@aavid.com.sg
www.aavidthermalloy.com
EUROPE
Italy Tel: +39 051 764011 email: sales.it@aavid.com
United Kingdom Tel: +44 1793 401400 email: sales.uk@aavid.com
Taiwan Tel: +886 (2) 2698-9888 email: sales@aavid.com.tw
103
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