MPC8343VRAGDB datasheet(69/79 Pages) FREESCALE

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MPC8343EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 10

Freescale Semiconductor

Thermal

that the thermocouple junction rests on the package. A small amount of epoxy is placed over the

thermocouple junction and over about 1 mm of wire extending from the junction. The thermocouple wire

is placed flat against the package case to avoid measurement errors caused by cooling effects of the

thermocouple wire.

20.2.4

Heat Sinks and Junction-to-Case Thermal Resistance

Some application environments require a heat sink to provide the necessary thermal management of the

device. When a heat sink is used, the thermal resistance is expressed as the sum of a junction-to-case

thermal resistance and a case-to-ambient thermal resistance:

RθJA = RθJC + RθCA

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.

The thermal performance of devices with heat sinks 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.

Table 60 shows heat sink thermal resistance for PBGA of the MPC8343EA.

Table 60. Heat Sink and Thermal Resistance of MPC8343EA (PBGA)

Heat Sink Assuming Thermal Grease

Air Flow

× 29 mm PBGA

Thermal Resistance

AAVID 30

× 30 × 9.4 mm pin fin

Natural convection

13.5

AAVID 30

× 30 × 9.4 mm pin fin

1 m/s

9.6

AAVID 30

× 30 × 9.4 mm pin fin

2 m/s

8.8

AAVID 31

× 35 × 23 mm pin fin

Natural convection

11.3

AAVID 31

× 35 × 23 mm pin fin

1 m/s

8.1

AAVID 31

× 35 × 23 mm pin fin

2 m/s

7.5

Wakefield, 53

× 53 × 25 mm pin fin

Natural convection

9.1

Wakefield, 53

× 53 × 25 mm pin fin

1 m/s

7.1

Wakefield, 53

× 53 × 25 mm pin fin

2 m/s

6.5

MEI, 75

× 85 × 12 no adjacent board, extrusion

Natural convection

10.1

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