Sourcing and lifecycle — active, automotive-grade, no LTB risk
No last-time-buy or end-of-life notices are on record. For a BOM freeze in a production program, this part carries no near-term obsolescence risk. The AEC-Q100 qualification and automotive series designation mean the part is manufactured on a line that maintains long-term supply commitments typical of automotive-grade products.
Closest functional alternative — LM53625LQURNLRQ1
When sourcing this part, the closest functional second-source candidate in the same family is the LM53625LQURNLRQ1. Both are AEC-Q100 qualified synchronous buck regulators in a wettable-flank QFN package. The LM53625 is fixed-output (5 V) and rated for 2.5 A, with a slightly higher input minimum of 3.9 V and a wider junction temperature range up to 150°C. The LMR33630APCQRNXRQ1 offers an adjustable output and 3 A capability. If your design requires an adjustable rail or the full 3 A, the LMR33630APCQRNXRQ1 is the correct choice; for a fixed 5 V, 2.5 A application with higher temperature tolerance, the LM53625LQURNLRQ1 is a valid drop-in after layout review (pinout may differ — verify the footprint).