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Hello

Could you  teach me about the junction temperature of AD820 because AD820 datasheet does not describe the junction ?

I think that the junction temperature is 150 degree celcius  as other parts and is it correct ?

Datasheet describes the internal power dissipation at absolute maximum rate.

These are  below and I think that these are defined at 0 degree celcius.

But, maximum junction temperature is 160 degree celicus at SOIC.   ( 1.0W  *160 degree celcius/W) .

Internal Power Dissipation at datasheet

Regards,

Terumasa

• Hi Terumasa,

In computing for the junction temperature of a device you can use the formula:

Power dissipation is given by the formula:

Assuming quiescent condition and no load is connected, junction temperature of your device at room temp. are:

PD @ Vsy = +/-15V, Isy = 900uA
PD = 27mW

TJ(PDIP) = 25C + (90 C/W x 27mW)

= 27.43C

TJ(SOIC) = 25C + (160 C/W x 27mW)

= 29.32C

TJ(MSOP) = 25C + (190 C/W x 27mW)

= 30.13C

If you want to learn more about absolute maximum ratings and thermal resistances you can refer to this Technical Article.

Regards,
Goz

• Hi Terumasa,

Junction temperature range is limited to -65C to 150C to avoid violating the absolute maximum ratings. The formulas above can help you in calculating whether you are operating within the range.

May I know why you needed the information?

Regards,
Goz

• Helloi Gauzz,

Could you teach me about the maximum junction temperature of AD820  ?

This is not described in the datasheet.

Alomost all of parts is desribed as 150 degree celcius but AD820 is not descibed.