SI5347 Datasheet, PDF (20/59 Pages) Silicon Laboratories – DUAL/QUAD DSPLL ANY-FREQUENCY, ANY-OUTPUT JITTER ATTENUATORS

Si5347/46
Table 13. Thermal Characteristics
Parameter
Symbol
Test Condition¹
Value
Unit
Si5347–64QFN
Thermal Resistance
Junction to Ambient
_JA
Still Air
Air Flow 1 m/s
22
°C/W
19.4
Air Flow 2 m/s
18.3
Thermal Resistance
_JC
9.5
Junction to Case
Thermal Resistance
_JB
9.4
Junction to Board
_JB
9.3
Thermal Resistance
_JT
0.2
Junction to Top Center
Si5346–44QFN
Thermal Resistance
Junction to Ambient
_JA
Still Air
Air Flow 1 m/s
22.3
°C/W
19.4
Air Flow 2 m/s
18.4
Thermal Resistance
_JC
10.9
Junction to Case
Thermal Resistance
_JB
9.3
Junction to Board
_JB
9.2
Thermal Resistance
_JT
0.23
Junction to Top Center
Notes:
1. Based on PCB Dimension: 3” x 4.5”, PCB Thickness: 1.6 mm, PCB Land/Via under GNP pad: 36, Number of Cu
Layers: 4
20
Rev. 1.1