Thermally
Conductive KC TM substrates is the best
state-of-the-art solution for transferring excess heat from electronic
devices to a heat sink. Various elastic
substrates are efficient for low power
applications. In all other cases, it is strongly recommended to use ceramics.
KC TM
substrates are based on aluminum oxide (Al2O3), which
greatly surpasses elastic materials (such as mica silicates, etc) in thermal conductivity and provides the best
performance for electronic devices, regardless of their power.
KC TM
substrates made from aluminum nitride (AlN) are noted for their outstanding thermal conductivity,
comparable to the conductivity of beryllium oxide-based ceramics, which are
potentially carcinogenic. They are not
only cheaper and safer than modern beryllium ceramics, but also exceed
their price / quality ratio.
Table
of comparative materials
|
Substrate Material / thickness |
Thermal
conductivity (W/m*K) |
Thermal
resistance (K/W) |
Improved efficiency/ratio |
|
Mica 0,05
mm |
0,7 |
0,170 |
1,4 |
||
Nomakon 0,2 mm |
2 |
0,240 |
1 |
||
KC TM
Ceramics |
Al2O3 |
Al2O3 0,25 mm |
25 |
0,03 |
8,6 |
Al2O3 0,4
mm |
25 |
0,040 |
5 |
||
Al2O3 0,63 mm |
25 |
0,060 |
3,3 |
||
Al2O3 1,0
mm |
25 |
0,100 |
2 |
||
AlN |
AlN 0,25mm |
180 |
0,004 |
60 |
|
AlN 0,5 mm |
180 |
0,007 |
30 |
||
AlN 1,0 mm |
180 |
0,014 |
15 |
||
AlN 2,0 mm |
180 |
0,028 |
7,5 |
Aluminum Oxide (Al2O3) substrate
with T=0,25 mm exceeds thermal
conductivity scale of elastic substrate by almost 10 times; that of mica silicate –
by 6 times.
KC TM
substrates have much better finishing
surface than in stamped substrates
and can be produced
in thickness range up to 0.25 mm.
There exists a concern among engineers
regarding the fragility of ceramic substrates. However, KC TM
ceramic
substrates of 0.25 mm and thinner are
able to bend slightly, and are not very sensitive to possible unevenness in
heat sink surfaces to which they are to be applied. KC TM
substrates can withstand any reasonable pressure - they can be broken, but
not crushed!
The high thermal conductivity of KC
TM substrates enables their use at greater thickness without critical
deterioration of thermal resistance. This can reduce stray capacitance between
the device and the heat sink, which is critical in devices such as
low-frequency power amplifiers. 1-mm thick aluminum nitride based KC TM substrate
reduces stray capacitance by 20 times
and has 10 times lower minimal thermal resistance compared to an
analogous mica substrate.
The
guaranteed dielectric strength of
KC TM substrates is at least 16 kV / mm for AlN and over 20kV/mm
for Al2O3, which is almost two twice higher than in machine-stamped ceramic
substrates.
Aluminum Nitride substrates:
Aluminum Oxide substrates:
Gratify your appliances with KC TM ceramics and solve
the question of "thermal
conductivity + Quality vs. Price" once and
for all!