The RD47F is a Zener diode from the * series, designed for voltage regulation and clamping applications. It is, which suits low-volume assembly, lab prototyping, or replenishing a bench stock drawer. The part is marked as RoHS non-compliant, so it contains lead — a consideration for designs that must meet RoHS exemption limits or for legacy BOMs where leaded solder is still the standard.
Because it is RoHS non-compliant, some franchise distributors may limit stocking, but independent distribution covers it readily. For a spare-parts storeroom, this is a part you can keep on the shelf without worrying about a sudden obsolescence notice.