Compare the candidate package with the outline, pin count and polarity mark on the actual board.
SMD Marking
L21
Possible components matching this marking.A marking is not a guaranteed identification by itself.
2possible components
LOWambiguity level
Filters2 candidates
Narrow the list using the package, manufacturer or component family printed on the board.
2 possible components
Results are ordered by the available marking evidence.
1 BAS 312 evidence sources Vishay smd2 DIODE HIGH2 sources SMD, Dual | Si-DiManufacturer hint: Vishay 2 BAS 312 evidence sources Philips Semiconductors / Thomson Semiconducteurs / Valvo / National Semiconductor / Unknown manufacturer (CDI) / Fairchild Semiconductor smd2 DIODE HIGH2 sources SMD, Dual General purpose controlled diode, 90V avalanche diode | Si-DiManufacturer hint: Philips Semiconductors / Thomson Semiconducteurs / Valvo / National Semiconductor / Unknown manufacturer (CDI) / Fairchild Semiconductor
Safe identification
How to verify this result
Check the official datasheet for pinout, voltage, current and thermal ratings—not only the marking.
Do not treat a short marking, a low-confidence candidate or a family match as a drop-in replacement.