What this reference does on the bench
The LM4050AIM3-3.0-T is a precision micropower shunt voltage reference that holds a 3.0 V output.
RoHS flag — check your BOM compliance
This part is RoHS non-compliant. That is the headline for any BOM that ships into EU or similar regulated markets. If your assembly line is RoHS-only, this variant will not pass incoming inspection; you need the lead-free suffix version in the same family. For a repair or a legacy board that already uses tin-lead solder, the non-compliant finish is actually the correct metallurgy — no risk of tin whiskers from mixing lead-free BGA balls with a tin-lead wave.
Package and handling in the field
SOT-23-3, supplied in Bulk tubes. Three pins, one orientation — the tab is pin 1. You can swap it on site with a standard iron and tweezers; no hot-air station needed. The marking is legible under a loupe, so a field tech can confirm the part without pulling it.