ADSP-BF531/ADSP-BF532/ADSP-BF533
Table 37. Thermal Characteristics for BC-160 Package
Parameter Condition Typical Unit
THERMAL CHARACTERISTICS
To determine the junction temperature on the application
printed circuit board, use:
JA
0 Linear m/s Airflow
27.1
23.85
22.7
7.26
0.14
0.26
0.35
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
TJ = TCASE + JT PD
JMA
JMA
JC
1 Linear m/s Airflow
2 Linear m/s Airflow
Not Applicable
where:
TJ = Junction temperature (°C).
T
CASE = Case temperature (°C) measured by customer at top
JT
JT
JT
0 Linear m/s Airflow
1 Linear m/s Airflow
2 Linear m/s Airflow
center of package.
JT = From Table 37 through Table 39.
PD = Power dissipation (see the power dissipation discussion
and the tables on 24 for the method to calculate PD).
Values of JA are provided for package comparison and printed
circuit board design considerations. JA can be used for a first
order approximation of TJ by the equation:
Table 38. Thermal Characteristics for ST-176-1 Package
Parameter Condition Typical Unit
JA
0 Linear m/s Airflow
34.9
33.0
32.0
0.50
0.75
1.00
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
TJ = TA + JA PD
JMA
JMA
JT
JT
JT
1 Linear m/s Airflow
2 Linear m/s Airflow
0 Linear m/s Airflow
1 Linear m/s Airflow
2 Linear m/s Airflow
where:
TA = ambient temperature (°C).
In Table 37 through Table 39, airflow measurements comply
with JEDEC standards JESD51–2 and JESD51–6, and the junc-
tion-to-board measurement complies with JESD51–8. The
junction-to-case measurement complies with MIL-STD-883
(Method 1012.1). All measurements use a 2S2P JEDEC test
board.
Table 39. Thermal Characteristics for B-169 Package
Parameter Condition Typical Unit
JA
0 Linear m/s Airflow
22.8
20.3
19.3
10.39
0.59
0.88
1.37
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
Thermal resistance JA in Table 37 through Table 39 is the figure
of merit relating to performance of the package and board in a
convective environment. JMA represents the thermal resistance
under two conditions of airflow. JT represents the correlation
JMA
JMA
JC
1 Linear m/s Airflow
2 Linear m/s Airflow
Not Applicable
between TJ and TCASE
.
JT
JT
JT
0 Linear m/s Airflow
1 Linear m/s Airflow
2 Linear m/s Airflow
Rev. H
| Page 50 of 64 | January 2011
ROCHESTER [ Rochester Electronics ]
