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INA333-HT: Thermal characteristics and Gain setting.

Part Number: INA333-HT
Other Parts Discussed in Thread: INA129-HT, OPA2333-HT, INA128-HT,

Hello,

  • In datasheet it says- It is not recommended to use a gain <100 for high temperature (210°C) applications [Application Information,page 14 ]. I would like to know if i need to add any extra circuit for using Gain (25~30) at 150°C in my design or this chip will straight forward work for me without any additional circuit.

  • Which package has good thermal characteristics JD or HKJ ?  for 150°C Ambient Temperature?

Thanks,

Arif

  • Hello Arif,

    1. In datasheet it says- It is not recommended to use a gain <100 for high temperature (210°C) applications [Application Information,page 14 ]. I would like to know if i need to add any extra circuit for using Gain (25~30) at 150°C in my design or this chip will straight forward work for me without any additional circuit.

    As mentioned in this post, the amplifier tends to become unstable for small gains at temperatures beyond about 125C, hence why this use case is discouraged. The added passives provide stability/compensation to permit the use of high gains at high temperatures, but there is no guarantee the compensation will work under your specified low-gain conditions. You may want to consider exploring other part options, such as the INA128-HT, INA129-HT, or even OPA2333-HT.

    2. Which package has good thermal characteristics JD or HKJ ?  for 150°C Ambient Temperature?

    This depends, both packages are "good". See page 5 in the INA333-HT datasheet for specified thermal resistance values. The JD package has a ~20 mil gap between the package bottom and PCB plane that can be plugged with underfill to improve thermal dissipation beyond the datasheet values (source), although the actual delta will depend on the type of underfill used.

    Cheers,

    Jon

  • Thank you Jon