Maxim DS33R11 Thermal Characteristics -3. Thermal Characteristics, Theta-JA vs. Airflow

DS33R11 Ethernet Mapper with Integrated T1/E1/J1 Transceiver

13.1Thermal Characteristics Table 13-3. Thermal Characteristics

PARAMETER	MIN	TYP	MAX
Ambient Temperature (Note 1)	-40°C		+85°C
Junction Temperature (Note 2)			+125°C
Theta-JA (θJA) in Still Air for 256-Pin		+20.3°C/W
27mm BGA (Notes 2, 3)

Note 1: The package is mounted on a four-layer JEDEC standard test board.

Note 2: Value guaranteed by design (GBD).

Note 3: Theta-JA (θJA) is the junction to ambient thermal resistance, when the package is mounted on a four-layer JEDEC standard test board.

Table 13-4. Theta-JA vs. Airflow

AIR FLOW	THETA-JA
	256-PIN (27mm) BGA
0m/s (Note 1)	20.3°C/W
1m/s (Note 1)	17.9°C/W
2.5m/s (Note 1)	16.9°C/W

Note 1: Value guaranteed by design (GBD).

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