EP2C5T144I8N Datasheet, PDF (450/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

Thermal Resistance
Thermal
Resistance
Thermal resistance values for Cyclone II devices are provided for a board
meeting JEDEC specifications and for a typical board. The values
provided are as follows:
■ θ_JA (° C/W) Still Air—Junction-to-ambient thermal resistance with
no airflow when a heat sink is not being used.
■ θ_JA (° C/W) 100 ft./minute—Junction-to-ambient thermal resistance
with 100 ft./minute airflow when a heat sink is not being used.
■ θ_JA (° C/W) 200 ft./minute—Junction-to-ambient thermal resistance
with 200 ft./minute airflow when a heat sink is not being used.
■ θ_JA (° C/W) 400 ft./minute—Junction-to-ambient thermal resistance
with 400 ft./minute airflow when a heat sink is not being used.
■ θ_JC (° C/W)—Junction-to-case thermal resistance for device.
■ θ_JB (° C/W)—Junction-to-board thermal resistance for specific board
being used.
Table 15–2 provides θ_JA (junction-to-ambient thermal resistance) values
and θ_JC (junction-to-case thermal resistance) values for Cyclone II devices
on a board meeting JEDEC specifications for thermal resistance
calculation. The JEDEC board specifications require two signal and two
power/ground planes and are available at www.jedec.org.
Table 15–2. Thermal Resistance of Cyclone II Devices for Board Meeting JEDEC Specifications (Part 1 of 2)
Device
EP2C5
EP2C8
EP2C15
EP2C20
EP2C35
Pin
Count
Package
144 TQFP
208 PQFP
256 FineLine BGA
144 TQFP
208 PQFP
256 FineLine BGA
256 FineLine BGA
484 FineLine BGA
240 PQFP
256 FineLine BGA
484 FineLine BGA
484 FineLine BGA
484 Ultra FineLine BGA
672 FineLine BGA
θ_{J A} (° C/W)
Still Air
31
30.4
30.2
29.8
30.2
27
24.2
21
26.6
24.2
21
19.4
20.6
18.6
θ_{J A} (° C/W) θ_{J A} (° C/W) θ_{J A} (° C/W)
100 ft./min. 200 ft./min. 400 ft./min.
29.3
27.9
25.5
29.2
27.3
22.3
26.1
23.6
21.7
28.3
26.9
24.9
28.8
26.9
21.7
23
20.5
18.5
20
17.8
16
17
14.8
13.1
24
21.4
17.4
20
17.8
16
17
14.8
13.1
15.4
13.3
11.7
16.6
14.5
12.8
14.6
12.6
11.1
θ_{J C}
(° C/W)
10
5.5
8.7
9.9
5.4
7.1
5.5
4.2
4.2
5.5
4.2
3.3
5
3.1
15–2
Cyclone II Device Handbook, Volume 1
Altera Corporation
February 2007