BD203 silicon NPN transistor in an (early *) TO-220 package. Package: early TOP-66 (*) Awaiting further info. Status: NOS (New Old Stock) found left on the shelf of a leading UK distributor ! , manufacturer unknown, but will be resolved in time..... Tested components: YES One for the collectors : YES RoHS compliant: no * unusual and obsolete package from 1971 / 72 https://elecena.pl/product/28734596/bd203-silicon-npn-transistor 2025-05-19 https://elecena.pl/product/28734596/bd203-silicon-npn-transistor 2026-02-22