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Insulators – Aluminum Oxide
Aluminum Oxide
Aluminum oxide has unique thermal conductivity qualities
and features low loss factors at high frequencies. It has high
compressive strength, high volume resistivity, low thermal
expansion and resists radiation.
Aluminum oxide insulating washers have a dielectric strength
of approximately 21.7 x 10 3 volts/mm for .76mm material (550
volts/mil for 0.030 inch material) and 16.9 x 10 3 volts/mm for
1.57mm material (430 volts/mil for 0.062 inch material). The
thermal conductivity of aluminum oxide is 15.06W/(m°C) at 75°C.
PROPERTY
A1203
Dielectric constant 25?°C (77°F)
Dissipation factor 25°C (77°F)
Electrical resistivity 25°C (77°F)
Dielectric strength (AC)
CHEMICAL – TYPICAL VALUE
94% nominal
ELECTRICAL
8.9 (1MHz)
8.9 (10GHz)
0.0001 (MHz)
0.0010 (10GHz)
>10 14 ohm-cm
8.66 x 10 3 volts/mm (6.35mm thick)
TEST METHOD
Spectrographic analysis
(100%-% by wt. of total
metallic impurity)
ASTM D150-70
ASTM D2520-70
ASTM D150-70
ASTM D2520-70
ASTM D1829-66
ASTM D116-69
[220 volts/mil (0.250” thick)]
16.73 x 10 3 volts/mm (1.27mm thick)
[425 volts/mil (0.050” thick)]
28.35 x 10 3 volts/mm (0.25mm thick)
[720 volts/mil (0.010” thick)]
PHYSICAL
Density
Hardness
Flexural strength 25°C (77°F)
Modules of elasticity
Poisson’s ratio
Tensile strength 25°C (77°F)
Compressive strength 25°C (77°F)
Coefficient of thermal expansion
Thermal conductivity
Specific heat (100°C)
Melting point
Maximum temperature for
continuous use
3.62 g/cm 3 (226 lb/ft 3 )
78 (Rockwell 45 N)
MECHANICAL
3.17 x 10 8 Pa (minimum) [46.00 psi (minimum)]
3.52 x 10 8 Pa (typical) [51,000 psi (typical)]
2.83 x 10 11 Pa (41 x 10 6 psi)
0.21
1.93 x 10 8 Pa (28,000 psi)
2.10 x 10 9 Pa (305,000 psi)
THERMAL
7.9 x 10 6 /°C (4.4 x 10 6 /°F)
18.01 W/(m°C) @ 25°C
14.24 W/(m°C) @ 100°C
79.56 W/(m°C) @ 400°C
8.79 x 10 4 KJ/kg°C [2.1 x 10 4 Btu/lb °F]
>3600°C (6512°F)
1700°C (3100°F)
ASTM C20-70
ASTM E18-67
ACMA Test #2
ASTM C623-69T
ASTM C623-69T
ACMA Test #4
ASTM C528-63T
ASTM C372-56
ASTM C408-58
ASTM C351-61
Aluminum Oxide for TO-3
ORDERING INFORMATION
3.68
(0.145)
DIA TYP (4)
1.83
(0.072)
"A"
"C" RAD
TYP (2)
Part number Thickness
“A” Dim
“B” Dim
“C” Dim
“D” Dim
“E” Dim
4103G*
4104G*
1.91 (0.075)
1.78 (0.070)
39.70 (1.563)
44.45 (1.750)
26.67 (1.050)
31.75 (1.250)
13.34 (0.525) 4.75 (0.187) 30.40 (1.197)
15.88 (0.625) 7.16 (0.282) 30.15 (1.187)
5.46
(0.215)
10.92
(0.430)
"B"
"D"
RAD
TYP (2)
15.09
(0.594)
"E"
Aluminum Oxide Ceramic for TO-220
ORDERING INFORMATION
"C"
"D"
Part number
Thickness
“A” Dim
“B” Dim
“C” Dim
“D” Dim
“E” Dim
4169G*
1.57 (0.062)
19.30 (0.760) 13.97 (0.550) 4.78 (0.188)
6.98 (0.275)
3.68 (0.145)
4170G**
4171G**
4177G**
1.78 (0.070)
1.78 (0.070)
1.78 (0.070)
19.30 (0.760) 13.97 (0.550) 4.78 (0.188)
16.51 (0.650) 12.70 (0.500) 4.32 (0.170)
17.45 (0.687) 14.27 (0.562) 5.54 (0.218)
6.98 (0.275)
6.35 (0.250)
7.14 (0.281)
3.68 (0.145)
3.81 (0.150)
3.18 (0.125)
"E"
DIA
"A"
"B"
Aluminum Oxide Ceramic for TO-218, TO-247, and TO-3P
ORDERING INFORMATION
"B"
"D"
Part number
Thickness
“A” Dim
“B” Dim
“C” Dim
“D” Dim
“E” Dim
4180G*
1.78 (0.070) 23.24 (0.915)
18.80 (0.740) 6.98 (0.275)
9.40 (0.370)
3.96 (0.156)
"A"
"C"
"E"
AMERICA
USA Tel: +1 (603) 224-9988 email: info@aavid.com
ASIA
Singapore Tel: +65 6362 8388 email: sales@aavid.com.sg
104
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
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