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LM34: Erratic output on LM34

Part Number: LM34

We have been using a LM34 for the past 30 years as a temperature sensor in a device we manufacture. We have not had any issues until recently. The issue is that  1-2% of the sensors  will work fine then swing widely from low to high and they return to normal in most cases.  Has any seen this before or no of any issues with any batches of product?