VSC7123QU 查看數據表（PDF） - Vitesse Semiconductor
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VSC7123QU Datasheet PDF : 18 Pages
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VELOCITYTM
VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
VSC7123
10-Bit Transceiver for Fibre
Channel and Gigabit Ethernet
Package Thermal Considerations
The VSC7123 is packaged in a 14mm, thermally-enhanced PQFP with an internal heat spreader a 10 mm,
thermally enhanced PQFP and a 10mm cavity-down, exposed pad TQFP. These packages use industry-standard
EIAJ footprints, but have been enhanced to improve thermal dissipation. The construction of the packages is
shown in Figure 10.
Figure 10: PQFP Package Cross Section
Plastic Molding Compound
Internal Heat Spreader
Insulator
Lead
Bond Wire
Die
Table 6: Thermal Resistance
Symbol
θjc
θca
θca-100
θca-200
θca-400
θca-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 with 200 LFM airflow
Thermal resistance from case-to-ambient with 400 LFM airflow
Thermal resistance from case-to-ambient with 600 LFM airflow
10mm
PQFP
10
50
41
37
32
28
14mm
PQFP
9.5
29
26
24
21
18
10mm
TQFP
7.0
40
38
35
33
30
Units
oC/W
oC/W
oC/W
oC/W
oC/W
oC/W
The VSC7123 is designed to operate with a case temperature up to 95oC. The user must guarantee that the
case temperature specification is not violated. With the thermal resistances shown in Table 7, the 10mm
thermally-enhanced PQFP package can operate in still air ambient temperatures of 50oC [50oC = 95oC - 0.9W *
50 C/W]. The 14mm thermally-enhanced PQFP package can operate in still air ambient temperatures of 69oC
[69oC = 95oC - 0.9W * 29 C/W]. The TQFP package can operate in a still air ambient temperature of 59oC
[59oC = 95oC - 0.9W * 40 C/W]. If the ambient air temperature exceeds these limits, a form of cooling through
a heatsink or an increase in airflow must be provided.
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.
G52212-0, Rev 4.3
03/25//01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
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