EP2C35 datasheet(2/7 Pages) ALTERA

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DS-CYTHRML-3.0

Altera Corporation

Altera Device Package Information Data Sheet

Cyclone III

Devices

Thermal resistance values for Cyclone III devices are provided for a board

meeting JEDEC specifications and for a typical board. The JEDEC board

specifications require two signals and two power/ground planes and are

available at www.jedec.org. The values are described in Tables 1

through 4.

Table 2 provides

θJA (junction-to-ambient thermal resistance) values and

θJC (junction-to-case thermal resistance) values for Cyclone III devices on

a board meeting JEDEC specifications for thermal resistance calculation.

Table 1. Thermal Resistance Values for Cyclone III Devices

Value

Description

θJA (C/W) Still Air

Junction-to-ambient thermal resistance (

θJA) with no airflow when a heat sink

is not being used.

θJA (C/W) 100 ft./minute

Junction-to-ambient thermal resistance with 100 ft./minute airflow when a

heat sink is not being used.

θJA (C/W) 200 ft./minute

Junction-to-ambient thermal resistance with 200 ft./minute airflow when a

heat sink is not being used.

θJA (C/W) 400 ft./minute

Junction-to-ambient thermal resistance with 400 ft./minute airflow when a

heat sink is not being used.

θJC (C/W)

Junction-to-case thermal resistance (

θJC) for device.

θJB (C/W)

Junction-to-board thermal resistance (

θJB) for specific board being used.

Table 2. Thermal Resistance of Cyclone III Devices for Board Meeting JEDEC Specifications (Part 1 of 2)

Device

Package

θJA (°C/W)

Still Air

θJA (°C/W)

100 ft./min.

θJA (°C/W)

200 ft./min.

θJA (°C/W)

400 ft./min.

θJC (°C/W)

EP3C5

E144

17.5

15.4

8.4

F256

32.4

28.9

25.5

11.7

U256

32.5

29.1

27.2

25.6

12.2

M164

38.2

31.5

29.6

27.9

11.6

EP3C10

E144

17.5

15.4

8.4

F256

32.4

28.9

25.5

11.7

U256

32.5

29.1

27.2

25.6

12.2

M164

38.2

31.5

29.6

27.9

11.6

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