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Insulators – Mica and Thermalsil
TM
III
Mica and Thermalsil
TM
III
ORDERING INFORMATION
Part number Description Device "A" Dim "B" Dim "C" Dim "D" Dim Figure
56-77-9G Mica TO-220 18.42 (0.725) 13.21 (0.520) 4.32 (0.170) 2.92 (0.115) B
56-03-2G Mica TO-3 42.04 (1.655) 27.00 (1.063) 3.96 (0.156) 1.57 (0.062) A
53-77-9G Thermalsil
TM
III TO-220 18.42 (0.725) 13.21 (0.520) 4.32 (0.170) 2.92 (0.115) B
53-03-2G Thermalsil
TM
III TO-3 42.04 (1.655) 27.00 (1.063) 3.96 (0.156) 1.57 (0.062) A
Property
Electrical
Dielectric strength 172 X 10
3
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 @ 10
6
Hz
Volume resistivity 10
15
ohm-cm
Physical
Modules of elasticity in tension 172 X 10
3
Mpa (25 X 10
6
) psi
Tensile strength 310 Mpa (45,000 psi)
Hardness mohs, shore 3.0, 115
Compressive strength 2.21 X 10
8
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 MICA INSULATORS
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.
FIGURE A
FIGURE B
"B"
30.15
(1.187)
10.92
(0.430)
"A"
1.83
(0.072)
"C"
DIA
TYP (2)
"D"
DIA
TYP (2)
"A"
"B"
"C"
"D"
DIA
Property Typical value 25°C Test method
Electrical
Dielectric constant
2.5@50 Hz ASTM D-150
2.5@10
3
Hz
2.5@10
6
Hz
Dielectric breakdown voltage 26.3 x 10
3
volts/mm (667 volts/mil) ASTM D-149
Volume resistivity 5.7 x 10
15
ohm-cm ASTM D-257
Dielectric dissipation factor 0.008@50 Hz ASTM D-150
0.004 @10
3
Hz
0.004 @10
6
Hz
Physical
Thickness 0.15mm
(0.006 inch)
Color Gray-Green
Tensile strength 6.1 x 10
7
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 UL card #E-58126 (S)
Service temperature -60°C to 180°C
(-76°F to 356°F)
TYPICAL PROPERTIES FOR THERMALSIL
TM
III