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Soft substrates are used in applications where packaged parts are soldered to the board. In some applications wirebonding can be done to soft substrates.
|
Manufacturer and material
|
Symbol
or
formula
|
Relative dielectric constant
|
Tolerance on dielectric constant
+/-
|
Diss-ipation factor
tan
|
Temp. coefficient of (ppm/C)
|
Mass density
(gr/cc)
|
Specific heat
(J/g/°C)
|
Thermal conduc-
tivity (W/m°C)
|
Coefficient of thermal expansion PPM/°C
x/y/z
|
|
Bakelite
|
|
4.8 |
|
|
|
|
|
|
|
|
Rogers
Duroid 5870
|
PTFE/
Random glass |
2.33 |
0.02 |
0,0012 |
-115 |
2.2 |
0.96 |
0.26 |
22/28/173 |
|
Rogers
Duroid 5880
|
PTFE/
Random glass |
2.2 |
0.02 |
0.0012 |
-129 |
2.2 |
0.96 |
0.26 |
31/48/237 |
|
Rogers
Duroid 6002
|
PTFE/
Random glass |
2.94
|
0.04 |
0.0012
|
0 |
2.1
|
0.93 |
0.44
|
16/16/24
|
Rogers
Duroid 6006 |
PTFE/
Random glass |
6 |
0.15 |
0.0027 |
-350 |
2.7 |
0.97 |
0.48 |
38/42/24 |
| RogersDuroid 6010 |
PTFE/
Random glass |
10.2-10.8 |
0.25 |
0.0023 |
-390 |
2.9 |
1 |
0.41 |
24/24/24 |
| FR-4 |
glass/ epoxy |
4.8 |
|
0.022 |
|
|
|
0.16 |
|
|
Polyethylene
|
|
2.25
|
|
|
|
|
|
|
|
Polyflon
CuFlon |
PTFE |
2.1 |
|
0.00045 |
|
|
|
|
12.9 |
| Polyflon PolyGuide |
polyolefin |
2.32 |
|
0.0005 |
|
|
|
|
108 |
Polyflon
Norclad |
thermoplastic |
2.55 |
|
0.0011 |
|
|
|
|
53 |
|
Polyflon Clad Ultem
|
thermoplastic
|
3.05
|
|
0.003
|
|
1.27
|
|
|
56
|
| PTFE |
PTFE |
2.1 |
|
0.0002 |
|
2.1 |
0.96 |
0.2 |
|
|
Rexolite
No. 1422
|
|
2.55
|
|
|
|
|
|
|
|
Rogers
R/flex 3700 |
Thermally stable thermoplastic |
2.0 |
|
0.002 |
|
|
|
|
8 |
|
Rogers
RO3003
|
PTFE ceramic
|
3
|
0.04 |
0.0013
|
13 |
2.1
|
0.93 |
0.5
|
17/17/24
|
|
Rogers
RO3006
|
PTFE ceramic
|
6.15
|
0.15 |
0.0025
|
-169 |
2.6
|
0.93 |
0.61
|
17/17/24
|
|
Rogers
RO3010
|
PTFE ceramic
|
10.2
|
0.3 |
0.0035
|
-295 |
3
|
0.93 |
0.66
|
17/17/24
|
|
Rogers
RO3203
|
PTFE ceramic
|
3.02 |
|
|
|
|
|
|
|
|
Rogers
RO3210
|
PTFE ceramic
|
10.2 |
|
|
|
|
|
|
|
|
Rogers
RO4003
|
Thermoset plastic ceramic glass |
3.38 |
0.05 |
0.0027 |
40 |
1.79 |
|
0.64 |
11/14/46 |
|
Rogers
RO4350B
|
Thermoset plastic ceramic glass |
3.48 |
0.05 |
0.004 |
50 |
1.86 |
|
0.62 |
14/16/50 |
|
Rogers
RO4403
|
Thermoset plastic ceramic glass |
3.17 |
|
|
|
|
|
|
|
| Teflon |
|
2.1 |
|
0.0001 |
|
2.13-2.22 |
|
|
|
|
Rogers
TMM 3
|
ceramic/ thermos |
3.27 |
0.032 |
0.002 |
37 |
1.78 |
0.87 |
0.7 |
15/15/23 |
|
Rogers
TMM 4
|
ceramic/ thermoset plastic |
4.5 |
0.045 |
0.002 |
0 |
2.07 |
0.83 |
0.7 |
16/16/21 |
|
Rogers
TMM 6
|
ceramic/ thermoset |
6 |
0.08 |
0.0023 |
-11 |
2.37 |
0.78 |
0.72 |
18/18/26 |
|
Rogers
TMM 10
|
ceramic/ thermoset |
9.2 |
0.23 |
0.0022 |
-38 |
2.77 |
0.74 |
0.76 |
21/21/20 |
|
Rogers
TMM 10i
|
ceramic/ thermoset |
9.8 |
0.245 |
0.002 |
-43 |
2.77 |
0.72 |
0.76 |
19/19/20 |
| Ultralam 2000 |
glass reinforced |
2.24-2.6 |
-.04 |
0.0019 |
-100 |
|
|
|
9.5/9.5/120 |