FG256 datasheet(31/108 Pages) ACTEL

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SX-A Family FPGAs

v5.3

2-11

Thermal Characteristics

Introduction

The temperature variable in Actel Designer software refers to the junction temperature, not the ambient, case, or

board temperatures. This is an important distinction because dynamic and static power consumption will cause the

chip's junction to be higher than the ambient, case, or board temperatures. EQ 2-9 and EQ 2-10 give the relationship

between thermal resistance, temperature gradient and power.

EQ 2-9

EQ 2-10

Where:

–

----------------

–

------------------

JA = Junction-to-air thermal resistance

JC = Junction-to-case thermal resistance

= Junction temperature

TA = Ambient temperature

TC = Ambient temperature

= total power dissipated by the device

Table 2-12 • Package Thermal Characteristics

Package Type

Count

Units

Still Air

1.0 m/s

200 ft./min.

2.5 m/s

500 ft./min.

Thin Quad Flat Pack (TQFP)

100

33.5

27.4

°C/W

Thin Quad Flat Pack (TQFP)

144

33.5

25.7

°C/W

Thin Quad Flat Pack (TQFP)

176

24.7

19.9

°C/W

Plastic Quad Flat Pack (PQFP)1

208

26.1

22.5

20.8

°C/W

Plastic Quad Flat Pack (PQFP) with Heat Spreader2

208

3.8

16.2

13.3

11.9

°C/W

Plastic Ball Grid Array (PBGA)

329

17.1

13.8

12.8

°C/W

Fine Pitch Ball Grid Array (FBGA)

144

3.8

26.9

22.9

21.5

°C/W

Fine Pitch Ball Grid Array (FBGA)

256

3.8

26.6

22.8

21.5

°C/W

Fine Pitch Ball Grid Array (FBGA)

484

3.2

14.7

13.6

°C/W

Notes:

1. The A54SX08A PQ208 has no heat spreader.

2. The SX-A PQ208 package has a heat spreader for A54SX16A, A54SX32A, and A54SX72A.

FG256 Datasheet(PDF) 31 Page - Actel Corporation

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