7022BG Datasheet, PDF (103/116 Pages) Aavid, Thermal Division of Boyd Corporation – Channel style heat sink with folded back fins

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
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.
Insulators – Mica and Thermalsil^TM III
FIGURE A
FIGURE B
"D"
DIA
TYP (2)
"C"
DIA
TYP (2)
"A"
1.83
(0.072)
"D"
DIA
10.92
(0.430) ^"B"
"A"
"B"
"C"
30.15
(1.187)
ORDERING INFORMATION
Part number
Description
56-77-9G
Mica
56-03-2G
Mica
53-77-9G
Thermalsil^TM III
53-03-2G
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
Property
Electrical
Dielectric strength
172 X 10³ volts/mm (4500 volts/mil)
0.025 mm to 0.076 mm thick in air (1 to 3 mils thick in air)
Dielectric constant
6.5 to 8.7
Dissipation factor
0.0001-0.0004 @ 10⁶ Hz
Volume resistivity
10¹⁵ ohm-cm
Physical
Modules of elasticity in tension
172 X 10³ Mpa (25 X 10⁶) psi
Tensile strength
310 Mpa (45,000 psi)
Hardness mohs, shore
3.0, 115
Compressive strength
2.21 X 10⁸ Pa (32,000 psi)
Specific gravity
2.9
Thermal
Thermal conductivity
0.528 W/(m °C ) (0.30 Btu/hr-ft °F)
Coefficient of thermal expansion 3.24 X 10^-5 °C (1.8 X 10^-5 °F)
Specific heat
0.084 KJ/Kg °C (0.02 Btu/Lb °F)
Melting point
1275°C (2327 °F)
Max. operating temperature
550 °C (1022 ºF)
TYPICAL PROPERTIES FOR THERMALSIL^TM III
Property
Typical value 25°C
Electrical
Dielectric constant
2.5@50 Hz
2.5@10³ Hz
2.5@10⁶ Hz
Dielectric breakdown voltage 26.3 x 10³ volts/mm (667 volts/mil)
Volume resistivity
5.7 x 10¹⁵ ohm-cm
Dielectric dissipation factor
0.008@50 Hz
0.004 @10³ Hz
0.004 @10⁶ Hz
Physical
Thickness
0.15mm
(0.006 inch)
Color
Gray-Green
Tensile strength
6.1 x 10⁷ Pa (8786 psi)
Hardness, shore A
87
Elongation
2% or less
Thermal
Thermal conductivity
0.92 W/(m °C ) (0.532 Btu/hr. ft °F)
Flame resistance
UL 94V-0
Service temperature
-60°C to 180°C
(-76°F to 356°F)
Test method
ASTM D-150
ASTM D-149
ASTM D-257
ASTM D-150
UL card #E-58126 (S)
www.aavidthermalloy.com
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