INA201-Q1: Parameter change estimation for a 10 year mission life and internal reference tolerance

Mehmet Durna

Part Number: INA201-Q1

Dear All,

My problem is, for my worst-case analysis, I need to calculate the estimated change in the following parameters for INA201AQDGKRQ1:

1. Total error at the output of the amplifier. The tool at the product page gives an error of 5.736% for 85C, 32V (CM), 3.5A, 5VDC (supply) conditions. I need an estimate of this after 10 years 100% duty 85C operation.

2. The tolerance of the internal reference voltage of 0.6V after 10 years, 100% duty operation under 85C.

For the first item, I have a gut-feeling that, it can be extrapolated by using Arrhenius equations since the part is qualified to AEC-Q100, it is tested for 125C operations for 1000hrs. However I am not sure about this method.

For the second item, I could not even find a beginning-of-life tolarance for 0.6V tolerance.

I appreciate all kinds of helps.

Best regards,

Mehmet

over 4 years ago

0 Javier Contreras4 over 4 years ago

TI__Mastermind 26485 points

Hello Mehmet,

I need to look into this a bit more and make sure I know the correct answer and what specifically I can share. This applies to 1 and 2.

About the starting point for the 0.6V tolerance it really combined with the offset of the comparator. I grabbed a screen shot of datasheet for your convenience.

0 Mehmet Durna over 4 years ago in reply to Javier Contreras4

Prodigy 90 points

Dear Javier,

Many thanks for this information. I will use this data as the operating margin for comparator. I assume this is guaranteed for 1000hrs at 125C. Is it advisable to extrapolate this tolerance to 10years according to squareroot of operation time?

I appreciate for your helps.

Best regards,

Mehmet DURNA

0 Javier Contreras4 over 4 years ago in reply to Mehmet Durna

TI__Mastermind 26485 points

Hello Mehmet,

The assumption that the qualification does the 1000 hrs at 125C is done. This does not tell you the shift just that the device meets the specifications. This will not give you a shift of the data. So you could not extrapolate an error form this with running constantly at 85C.

I am sorry but this data you are looking for is not available. This is not to say this will work in your application.

0 Mehmet Durna over 4 years ago in reply to Javier Contreras4

Prodigy 90 points

Dear Javier,

Many thanks for your helps and insights given.

Best regards,

Mehmet

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INA201-Q1: Parameter change estimation for a 10 year mission life and internal reference tolerance