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LQFP 144 PD
98ASS23177W
LQFP 176 PD
98ASS23479W
MAPBGA 252 PD
98ASA00468D
MAPBGA 292 ED
98ASA00261D
20 Thermal characteristics
The following tables describe the thermal characteristics of the device.
Junction temperature is a function of die size, on-chip power dissipation, package thermal
resistance, mounting side (board) temperature, ambient temperature, air flow, power
dissipation or other components on the board, and board thermal resistance.
Table 56. Thermal characteristics for the 144-pin LQFP package
Rating
Conditions
Symbol
Value
Unit
Junction to Ambient Natural Convection
Single layer board (1s)
R
θ
JA
41.3
°C/W
Junction to Ambient Natural Convection
,
,
Four layer board (2s2p)
R
θ
JA
33.0
°C/W
Junction to Ambient (@200 ft/min)
,
Single layer board (1s)
R
θ
JMA
32.4
°C/W
Junction to Ambient (@200 ft/min)
,
Four layer board (2s2p)
R
θ
JMA
26.7
°C/W
Junction to Board
—
R
θ
JB
21.5
°C/W
—
R
θ
JC
7.0
°C/W
Natural Convection
ψ
JT
0.25
°C/W
Junction to Package Lead
Natural Convection
ψ
JB
16.5
°C/W
1. Junction temperature is a function of die size, on-chip power dissipation, package thermal resistance, mounting site
(board) temperature, ambient temperature, air flow, power dissipation of other components on the board, and board
thermal resistance.
2. Per SEMI G38-87 and JEDEC JESD51-2 with the single layer board horizontal.
3. Per JEDEC JESD51-6 with the board horizontal.
4. Thermal resistance between the die and the printed circuit board per JEDEC JESD51-8. Board temperature is measured
on the top surface of the board near the package.
5. Thermal resistance between the die and the case top surface as measured by the cold plate method (MIL SPEC-883
Method 1012.1).
6. Thermal characterization parameter indicating the temperature difference between package top and the junction
temperature per JEDEC JESD51-2.
7. Thermal characterization parameter indicating the temperature difference between package bottom center and the junction
temperature per JEDEC JESD51-12.
Table 57. Thermal characteristics for the 176-pin LQFP package
Rating
Conditions
Symbol
Value
Unit
Junction to Ambient Natural Convection
Single layer board (1s)
R
θ
JA
49.9
°C/W
Junction to Ambient Natural Convection
,
,
Four layer board (2s2p)
R
θ
JA
33.8
°C/W
Table continues on the next page...
Thermal characteristics
SPC5746R Microcontroller Data Sheet, Rev. 6, 06/2017
NXP Semiconductors
87