Can you please provide the following information for the OPA2141AID part?
The maximum allowable power dissipation in OPA2141AID package is such as not to exceed the max junction temperature, Tj, of 150C - see below.
To calculate the actual junction temperature, you need to use the thermal resistance table (see below) which for OPA2141 SO-8 (D) package specifies junction-to-ambient thermal resistance of 160C/W, multiply it by the power dissipation inside the package, and add it to ambient temperature.
Since max output current (short-circuit) specified for OPA2141 is +36mA/-30mA (see below), you need to use it as the worst-case to calculate the max power dissipation;
For example, using OPA2141AID with +/-18V supplies at ambient 25C with input above ground and output shorted to mid-supply (GND) would result in:
Pmax=36mA*18V = 648mW and
Tj=25C+0.648W*160C/W=~129C junction temperature
while shorting the output to the negative rail would result in:
Tj=25C+36mA*36V*160C/W=~232C thus, exceeding the maximum rated junction temperature of 150C.
The last but not the least critical spec of OPA2141AID package - its weight is 79mg.
Marek LisSr Application EngineerPrecision Analog - Burr-Brown ProductsTexas Instruments - Tucson
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