HEXFET N-channel in a SOT-23 — what the 29 mOhm at 4.5 V means
The IRLML6344TRPBF: N-channel HEXFET, 30 V Vdss, 5 A Id, 29 mOhm Rds(on) at 4.5 V, in a SOT-23 package.
Logic-level gate: driven straight from 3.3 V logic
The drive voltage range is specified from 2.5 V (minimum for rated Rds(on)) to 4.5 V (maximum Rds(on) test condition).
SOT-23 rework — lift the part, not the pad
The TO-236-3 / SC-59 / SOT-23-3 package has three visible leads. No hidden thermal pad.
The part is ROHS3 compliant. For current designs, there is no urgency to qualify a second source — though the HEXFET family includes several pin-compatible 30 V N-channel options if dual-sourcing becomes a requirement later.