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REF5010AIDR , OPA277UA

We have ordered the below mentioned part from TI website and  received part with on part differ .

 

Can you please let me know what is the “K” and “A” represents In the MPN ?

 

AVALON PART #

MPN

MFR

REMARKS

B191-028-4017-00

OPA277UA

TEXAS INSTRUMENTS

ON PART DIFFER (RECEIVED  OPA277UK ) ORIGINAL(OPA277UA)

 

Same issue in this part which we have ordered in The mouser .

 

 

AVALON PART #

MPN

MFR

REMARKS

B191-028-4027-00

REF5010AIDR

TEXAS INSTRUMENTS

ON PART MARKING DIFFER (RECVD ON PART=REF 5010 K) : (IN DATA SHEET= REF 5010 A)