Post Go back to editing

AD820 Junction temperature

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) .

So please let me cralify the junction temeprature of AD820.

Internal Power Dissipation at datasheet
8-Lead PDIP (N) 1.6 W
8-Lead SOIC_N (R) 1.0 W
8-Lead MSOP (RM) 0.8 W

Regards,

Terumasa

Parents
  • 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

Reply
  • 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

Children
No Data