VSC7182 Datasheet, PDF (16/18 Pages) Vitesse Semiconductor Corporation – Quad Transceiver for Gigabit Ethernet and Fibre Channel

® VITESSE
SEMICONDUCTOR CORPORATION
Quad Transceiver
for Gigabit Ethernet and Fibre Channel
Advance Product Information
VSC7182
Package Thermal Characteristics
The VSC7182 is packaged in a 23mm BGA package with 1.27mm eutectic ball spacing. The construction
of the package is shown in Figure 6.
Figure 6: Package Cross Section
Copper Heat Spreader
Adhesive
Die Attach Epoxy
Die
Wirebond
Polyimide Dielectric
Encapsulant
Eutectic Solder Balls
The VSC7182 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 in Table 8, the VSC7182 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, some form of cooling through a
heatsink or an increase in airflow must be provided.
Table 8: 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 16
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]
Internet: www.vitesse.com
G52307-0, Rev 2.2
10/10/00