LM74: LM74 temperature sensor accuracy issue

Eddie Chou

Part Number: LM74

Hi Team,

My customer happened LM74 accuracy issue, they test LM74 at ambient 25 degree but LM74 output value is higher than sensor case and PCB (under sensor) 2.5 deg. customer working temperature range is (-10˚C to +65 ˚C) and the accuracy should under 1.25 degree.

Does 2.5 degree higher than test temperature is normal?

Thanks & Regards

Eddie

over 3 years ago

0 Josh Wyatt over 3 years ago

TI__Guru* 91086 points

Eddie -

That measurement (+2.5C) would exceed the part spec in that operating range - would you please help get the details of how they arrived at this conclusion and would you please get the schematic and layout of the customer implementation for us?

0 Josh Wyatt over 3 years ago in reply to Josh Wyatt

TI__Guru* 91086 points

Eddie -

closing this post, as you moved this to email, due to the confidential nature of the customer drawings.

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LM74: LM74 temperature sensor accuracy issue