VSC7186 Datasheet, PDF (14/16 Pages) Vitesse Semiconductor Corporation – Quad Transceiver for Gigabit Ethernet

VITESSE
SEMICONDUCTOR CORPORATION
Quad Transceiver
for Gigabit Ethernet
Advance Product Information
VSC7186
Package Thermal Characteristics
The VSC7186 is packaged in a 23 mm BGA package with 1.27mm eutectic ball spacing. The construction
of the package is shown below.
Figure 6: Package Cross Section
Copper Heat Spreader
Adhesive
Die Attach Epoxy
Die
Wirebond
Polyimide Dielectric
Encapsulant
Eutectic Solder Balls
The VSC7186 is designed to operate with a case temperature up to 100^oC. In order to comply with this tar-
get, the user must guarantee that the case temperature specification of 100^oC is not violated. With the Thermal
Resistances shown below, the VSC7186 can operate in still air ambient temperatures of 40^oC [ 40^oC = 100^oC
- 2.5W * 24^oC/W ]. If the ambient air temperature exceeds these limits then some form of cooling through a
heatsink or an increase in airflow must be provided.
Table 7: Thermal Resistance
Symbol
θ_jc
θ_ca
θ_ca-100
θ_ca-200
θ_ca-400
θ_ca-600
Description
Thermal resistance from junction to case
Thermal resistance from case to ambient in still air including
conduction through the leads.
Thermal resistance from case to ambient with 100 LFM airflow
Thermal resistance from case to ambient with200 LFM airflow
Thermal resistance from case to ambient with 400 LFM airflow
Thermal resistance from case to ambient with 600 LFM airflow
Value
4.3
24
21
18.5
17
15
Units
o_C/W
o_C/W
o_C/W
o_C/W
o_C/W
o_C/W
Moisture Sensitivity Level
This device is rated at with a Moisture Sensitivity Level 3 rating. Refer to Application Note AN-20 for
appropriate handling procedures.
Page 14
 VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: [phone]
G52306-0, Rev. 2.0
3/27/00