VSC7133 データシートの表示（PDF） - Vitesse Semiconductor

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VSC7133

10-bit Transceiver for Fibre Channel and Gigabit Ethernet

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

Advance Product Information

VSC7133

10-bit Transceiver for Fibre

Channel and Gigabit Ethernet

Thermal Considerations

The VSC7133 is packaged in a 10mm, thermally enhanced PQFP with an internal heat spreader. These

packages use industry-standard EIAJ footprints, but have been enhanced to improve thermal dissipation. The

construction of the packages are shown below.

Figure 10: 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

10

50

41

37

32

28

Units

oC/W

oC/W

oC/W

oC/W

oC/W

oC/W

The VSC7133 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 above, the 10mm Thermally

Enhanced PQFP can operate in still air ambient temperatures of 50oC [50oC = 95oC - 0.9W * 50]. If the ambient

air temperature exceeds these limits then some form of cooling through a heatsink or an increase in airflow must

be provided.

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.

G52187-0 Rev. 2.4

1/17/00

© VITESSE SEMICONDUCTOR CORPORATION

741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896

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