Dear support team,
We are using 2.5V 0.1% reference in the many of our products. A few month ago we received the PCB assembly which is operated differently to the all previous batches. We investigate this isuue and found out a strange ripple on the reference output voltage. Please see below the x-ray picture of the old 2010 part, which was still leaded. You can see distinctly the wire bondig connection to the die.
On the next picture there is the part from the year 2018 we have in our stock. It is possible to see the wire bonding connetcion also.
And on the last picture is the stange part we found on the subcontractor assemply. The wires maybe extrimely thin as we cannot recognize them on the picture. The 2.5V refernce voltage exist. The marking on the all parts is R2A.
The questions are:
1) Did you change the production technology for this part since 2010?
2) Is the last part looks good to you?
3) Can the higher impedance of the wire connection will be the reason of the high (5-10mV) ripple modulation on the reference voltage?
BR,
Arie Zillbershtein
