89H48H12G3YCHLG IDT, 89H48H12G3YCHLG Datasheet - Page 20

• Manufacturer Part Number: 89H48H12G3YCHLG
• Description: Peripheral Drivers & Components - PCIs
• Manufacturer: IDT

Specifications of 89H48H12G3YCHLG

• Rohs: yes

Thermal Considerations
tion that is relevant to the thermal performance of the PES48H12G2 switch.
IDT 89HPES48H12G2 Data Sheet
This section describes thermal considerations for the PES48H12G2 (27mm
Note: It is important for the reliability of this device in any user environment that the junction temperature not exceed the T
specified in Table 17. Consequently, the effective junction to ambient thermal resistance (
maintained below the value determined by the formula:
Given that the values of T
achieve the desired
provided in Table 17), thermal resistance of the chosen adhesive (
circuit board (number of layers and size of the board). It is strongly recommended that users perform their own thermal analysis for their own
board and system design scenarios.
θ
Symbol
JA(effective)
T
T
A(max)
J(max)
θ
θ
P
JB
JC
θ
JA
= (T
J(max)
Effective Thermal Resistance, Junction-to-Ambient
θ
- T
JA
Thermal Resistance, Junction-to-Board
Thermal Resistance, Junction-to-Case
A(max)
is left up to the board or system designer, but in general, it can be achieved by adding the effects of
Table 17 Thermal Specifications for PES48H12G2, 27x27 mm FCBGA676 Package
J(max)
Power Dissipation of the Device
)/P
Junction Temperature
Ambient Temperature
, T
Parameter
A(max)
, and P are known, the value of desired
20 of 44
θ
CS
Value
2
12.44
14.6
0.15
125
), that of the heat sink (
7.8
6.4
2.7
FCBGA676 package). The data in Table 17 below contains informa-
70
85
θ
JA
Units
becomes a known entity to the system designer. How to
Watts
o
o
o
o
o
C/W
C/W
C/W
C/W
C/W
o
o
o
C
C
C
θ
JA
) for the worst case scenario must be
θ
SA
Maximum for commercial-rated products
Maximum for industrial-rated products
), amount of airflow, and properties of the
Conditions
1 m/S air flow
2 m/S air flow
Zero air flow
Maximum
Maximum
November 28, 2011
J(max)
θ
JC
(value
value