datecode on LTC4040EUFD#PBF

Question

Hello,

We have recently received LTC4040EUFD#PBF.

The seller announces a 2013 date code.

On the new version of our board, the component does not seem to work: ( 0V on IGate pin, voltage on PFI slightly lower than expected, 1.2V on fault pin ).

The design of this board is very similar to the old version. (The old version, with an LTC4040EUFD#PBF too, works): Same schematics, same component references, minor routing differences.

So my assumptions are:
- the components we bought are not what we expected.
- there have been changes between the 2013 version and the current version
- minor routing differences prevent the component from working.

As the date code is quite old, I wonder if there are any changes between the 2013 components and the newer component (soldered onto our old component). Both components are LTC4040EUFD#PBF.

The markings on the 2013 component are:

3E
4040
N5889

On our old board (the working one), the markings on the components are:

8C
4040
N3208

Is there a change in the components between the 2013 version and the current version?

FCO_ereca · Accepted Answer

Thank you for your reply.

There is no doubt that the components we bought were fake: The LTC4040 were released in 2015. So a component with a 2013 date code is a counterfeit.

With the LTC4040s now available, we replaced our components on the new board with a new component. This works.

ron.p · Answer

Hi FCO_ereca, 
 There is a revision history on page 25 of the datasheet. Based on these changes, there should be no major differences on the LTC4040. What you can do is try to swap the parts of the old board to the new board. If it doesn't work, you may be right that there could be problems on the routing of the new board. If it works, make sure that you get your parts from authorized distributors.

Electronic Design Services - PartnerZone

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datecode on LTC4040EUFD#PBF

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