SI5341 Datasheet, PDF (21/56 Pages) Silicon Laboratories – LOW-JITTER, 10-OUTPUT, ANY-FREQUENCY, ANY-OUTPUT CLOCK GENERATOR

Si5341/40
Table 13. Thermal Characteristics
Parameter
Symbol
Test Condition^*
Value
Units
Si5341 — 64QFN
Thermal Resistance
_JA
Still Air
22
Junction to Ambient
Air Flow 1 m/s
19.4
°C/W
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
Si5340–44QFN
Thermal Resistance
_JA
Still Air
22.3
Junction to Ambient
Air Flow 1 m/s
19.4
°C/W
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
*Note: Based on PCB Dimension: 3” x 4.5”, PCB Thickness: 1.6 mm, PCB Land/Via under GND pad: 36, Number of Cu
Layers: 4
Rev. 1.0
21