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INA125P PDIP package and INA125UA SOIC Package

We  have  tested the given circuit using INA125P DIP package.  At the 16th pin , we got 10V with respect to ground , to power up the load cell. Also we have given the output of the loadcell to pins 6 and 7 of INA125P with a gain resistor of 220ohms and we received the output (at pin 10 ) correctly.  But now we are using INA125UA SOIC package instead of the INA125P .With same circuit given below, INA125UA is giving only 0.22V at 16th pin instead of 10V. So we are not being able to power up the loadcell using INA125UA. Why we are not being able to get 10v at 16th pin of INA125UA using the same circuit. Kindly help us as soon as possible.

  • Hello "Unknown Unknown 26",

    I assume the use of the DIP package initially because you created a prototype on something like a protoboard. I assume you switched to the surface mount device upon designing a PCB. If my assumptions are correct, please post the PCB schematic and layout so we can take a look. Provided my assumptions are correct, please ensure that the device is soldered to the board properly and with the correct orientation.

    Since you have a working prototype of the DIP implementation, another idea is to replace the INA125PA with an INA125UA soldered to an SO16-to-DIP adapter board. Proper operation will ensure that the device is working correctly.