The following table(s) show the thermal resistance characteristics for the HTQFP–PTP mechanical package.
Table 8-2 Thermal Resistance Characteristics (HTQFP Package) [PTP]
NO. |
CHARACTERISTIC |
°C/W(1) |
°C/W(2) |
°C/W(3) |
°C/W(4) |
AIR FLOW (m/s)(5) |
1 |
RΘJC |
Junction-to-case |
7.8 |
9.4 |
8.6 |
10.1 |
N/A |
2 |
RΘJB |
Junction-to-board |
6.2 |
9.9 |
7.1 |
10.6 |
N/A |
3 |
RΘJA |
Junction-to-free air |
21.3 |
27.9 |
23.2 |
30.6 |
0.00 |
4 |
RΘJMA |
Junction-to-moving air |
14.3 |
20.2 |
|
22.6 |
0.50 |
5 |
13.1 |
18.6 |
|
21.0 |
1.00 |
6 |
12.1 |
17.4 |
|
19.6 |
2.00 |
7 |
11.2 |
16.2 |
|
18.2 |
4.00 |
8 |
PsiJT |
Junction-to-package top |
0.5 |
0.7 |
|
0.8 |
0.00 |
9 |
0.6 |
0.9 |
|
1.0 |
0.50 |
10 |
0.7 |
1.0 |
|
1.1 |
1.00 |
11 |
0.8 |
1.1 |
|
1.3 |
2.00 |
12 |
1.0 |
1.3 |
|
1.5 |
4.00 |
13 |
PsiJB |
Junction-to-board |
6.3 |
9.5 |
|
10.8 |
0.00 |
14 |
5.9 |
8.8 |
|
9.9 |
0.50 |
15 |
5.9 |
8.7 |
|
9.8 |
1.00 |
16 |
5.8 |
8.6 |
|
9.7 |
2.00 |
17 |
5.8 |
8.5 |
|
9.6 |
4.00 |
(1) Simulation data, using a model of a JEDEC defined 2S2P system with a 12mmx12mm copper pad on the top and bottom copper layers connected with an 8x8 thermal via array and soldered to the package thermal pad. Power dissipation of 1W assumed, 70C Ambient temp assumed. Signal layer copper coverage 20%, inner layer copper coverage 90%. Actual performance will change based on environment as well as application. For more information, see these EIA/JEDEC standards – EIA/JESD51-2, Integrated Circuits Thermal Test Method Environment Conditions - Natural Convection (Still Air) and JESD51-7, High Effective Thermal Conductivity Test Board for Leaded Surface Mount Packages.
(2) Simulation data, using the same model but with 1oz (35um) top and bottom copper thickness and 0.5oz (18um) inner copper thickness. Power dissipation of 1W and ambient temp of 70C assumed.
(3) Simulation data, 1S1P PCB model with 12x12mm copper pad on the top layer soldered to device thermal pad and connected to the bottom copper layer (90% copper) with an 8x8 thermal via array. Power dissipation of 1W and ambient temp of 70C assumed. Copper thickness 2oz (70um) top and bottom.
(4) Simulation data, 1S1P PCB model with 12x12mm copper pad on the top layer soldered to device thermal pad and connected to the bottom copper layer (90% copper) with an 8x8 thermal via array. Power dissipation of 1W and ambient temp of 70C assumed. Copper thickness 1oz (35um) top and bottom.
(5) m/s = meters per second