VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Datasheet
Quad Transceiver for
Gigabit Ethernet and Fibre Channel
VSC7139
Pin
Name
Description
B9,F17,G3,K3,
K14,K15,L3,P6,
P8,P10,P12
R6,R10,R12,T2T
6,T8,T10,T12T1
5,U1,U2,U8,U9,
U12,U15
VSS
Ground
U16, U17
Package Thermal Characteristics
The VSC7139 is packaged in a 23 mm 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
Die
Wirebond
Die Attach Epoxy
Adhesive
Polyimide Dielectric
Encapsulant
Eutectic Solder Balls
o
The VSC7139 is designed to operate with a case temperature up to 100 C. In order to comply with this tar-
o
get, the user must guarantee that the case temperature specification of 100 C is not violated. With the Thermal
o
o
Resistances shown in Table 8, the VSC7139 can operate in still air ambient temperatures of 56.75 C [ 56.75 C
o
o
= 100 C - 2.5W * 17.3 C/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 8: Thermal Resistance
Symbol
θjc
Description
Thermal resistance from junction to case
Value
Units
1.0
oC/W
oC/W
oC/W
oC/W
oC/W
oC/W
θca
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
17.3
15.7
14.5
13.0
12.0
θca-100
θca-200
θca-400
θca-600
Moisture Sensitivity Level
This device is rated at a Moisture Sensitivity Level 3 rating with maximum floor life of 168 hours at 30ºC,
60% relative humidity. Please refer to Application Note AN-20 for appropriate handling procedures.
G52196-0, Rev 3.3
5/14/01
Page 15
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