VSC7182 datasheet(16/18 Pages) VITESSE

16 / 18 page

VITESSE

SEMICONDUCTOR CORPORATION

Advance Product Information

VSC7182

Quad Transceiver

for Gigabit Ethernet and Fibre Channel

Page 16

G52307-0, Rev 2.2

10/10/00

Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com

Internet: www.vitesse.com

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

The VSC7182 is designed to operate with a case temperature up to 100oC. In order to comply with this tar-

get, the user must guarantee that the case temperature specification of 100oC is not violated. With the thermal

resistances shown in Table 8, the VSC7182 can operate in still air ambient temperatures of 40oC [40oC =

100oC - 2.5W * 24oC/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

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.

Symbol

Description

Value

Units

Thermal resistance from junction-to-case

4.3

oC/W

Thermal resistance from case-to-ambient in still air including conduction

through the leads.

oC/W

ca-100

Thermal resistance from case-to-ambient with 100 LFM airflow

oC/W

ca-200

Thermal resistance from case-to-ambient with200 LFM airflow

18.5

oC/W

ca-400

Thermal resistance from case-to-ambient with 400 LFM airflow

oC/W

ca-600

Thermal resistance from case-to-ambient with 600 LFM airflow

oC/W

Die

Adhesive

Copper Heat Spreader

Encapsulant

Eutectic Solder Balls

Wirebond

Polyimide Dielectric

Die Attach Epoxy

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