MPC8321EVRADDC datasheet(74/82 Pages) FREESCALE

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MPC8323E PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 4

Freescale Semiconductor

Thermal

where:

RθJA = junction-to-ambient thermal resistance (°C/W)

RθJC = junction-to-case thermal resistance (°C/W)

RθCA = case-to-ambient thermal resistance (°C/W)

RθJC is device related and cannot be influenced by the user. The user controls the thermal environment to

change the case-to-ambient thermal resistance, RθCA. For instance, the user can change the size of the heat

sink, the air flow around the device, the interface material, the mounting arrangement on printed-circuit

board, or change the thermal dissipation on the printed-circuit board surrounding the device.

To illustrate the thermal performance of the devices with heat sinks, the thermal performance has been

simulated with a few commercially available heat sinks. The heat sink choice is determined by the

application environment (temperature, air flow, adjacent component power dissipation) and the physical

space available. Because there is not a standard application environment, a standard heat sink is not

required.

Accurate thermal design requires thermal modeling of the application environment using computational

fluid dynamics software which can model both the conduction cooling and the convection cooling of the

air moving through the application. Simplified thermal models of the packages can be assembled using the

junction-to-case and junction-to-board thermal resistances listed in the thermal resistance table. More

detailed thermal models can be made available on request.

Heat sink vendors include the following list:

Aavid Thermalloy

603-224-9988

80 Commercial St.

Concord, NH 03301

Internet: www.aavidthermalloy.com

Alpha Novatech

408-567-8082

473 Sapena Ct. #12

Santa Clara, CA 95054

Internet: www.alphanovatech.com

International Electronic Research Corporation (IERC) 818-842-7277

413 North Moss St.

Burbank, CA 91502

Internet: www.ctscorp.com

Millennium Electronics (MEI)

408-436-8770

Loroco Sites

671 East Brokaw Road

San Jose, CA 95112

Internet: www.mei-thermal.com

Tyco Electronics

800-522-2800

Chip Coolers™

P.O. Box 3668

Harrisburg, PA 17105-3668

Internet: www.chipcoolers.com

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