Original question:
Hi ,
Im doing reliability analysis for our project. Need to calculation operating /junction temperature of the device.
Considering TA-65C
Rja-615C/W
Ipp=1A
VC=7.38V VCLAMP=(VBREAKDOWN+IPP*RDYN)
Ppp=7.38W
with above consideration the junction temperature is 4538,which is unrealistic.Can you please help to correct the issue
Hi Subathra,
The formula for junction temperature is Tj = TA + RθJA * PDEV, where:
Tj = junction temperature
TA = ambient temperature
RθJA = thermal resistance from junction to ambient
PDEV = power consumed by device
PDEV will be equal to the breakdown voltage (Vb) times the current at the breakdown voltage (1 mA = Ib)
Vb for TPD1E10B06 is 6V, meaning PDEV = 6 V * 0.001 A = 0.006 W
RθJA = 615.5 C/W
RθJA * PDEV = 615.5 C/W * 0.006 W = 3.693 C
Therefore, Tj = TA + 3.693, meaning Tj = 65 + 3.693 -> Tj = 68.693.
In addition, the datasheet specifies the operating and storage temperature ranges for this diode, shown below:
Please let me know if you have any questions!
Best Regards,
Josh Prushing
