Datasheet

2007 Microchip Technology Inc. DS22070A-page 23
MCP1824/MCP1824S
5.3.1.2 Junction Temperature Estimate
To estimate the internal junction temperature, the
calculated temperature rise is added to the ambient or
offset temperature. For this example, the worst-case
junction temperature is estimated below:
5.3.1.3 Maximum Package Power
Dissipation at 60°C Ambient
Temperature
From this table, you can see the difference in maximum
allowable power dissipation between the SOT-223-5
package and the SOT-23-5 package.
T
J
=T
JRISE
+ T
A(MAX)
T
J
= 19.1°C + 60.0°C
T
J
=79.1°C
SOT-223-5 (62°C/W Rθ
JA
):
P
D(MAX)
= (125°C – 60°C) / 62°C/W
P
D(MAX)
= 1.048W
SOT-23-5 (256°C/Watt Rθ
JA
):
P
D(MAX)
= (125°C – 60°C)/ 256°C/W
P
D(MAX)
= 0.254W