Identify an unknown SMD part: marking code “BLACK”

Packages rarely print the full part number. The marking below is shared by several part numbers — use the package, pin count and the manufacturer family together to narrow it down, then confirm against the datasheet.

19 candidates 19 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BA423AL	PHI	SOD80C	Public marking directory
BAS32L	PHI	SOD80C	Public marking directory
BAS45AL	PHI	SOD80C	Public marking directory
BAV105	PHI	SOD80C	Public marking directory
BB909A	PHI	SOD68 (DO34)	Public marking directory
BB910	PHI	SOD68 (DO34)	Public marking directory
BB911/A	PHI	SOD68 (DO34)	Public marking directory
BY505	PHI	SOD61A	Public marking directory
BY614	PHI	SOD61H2	Public marking directory
BY8424	PHI	SOD61AK	Public marking directory
BYX101G	PHI	SOD88A	Public marking directory
BYX105G	PHI	SOD88A	Public marking directory
BYX90G	PHI	SOD83A	Public marking directory
PMLL4148	PHI	SOD80C	Public marking directory
PMLL4150	PHI	SOD80C	Public marking directory
PMLL4151	PHI	SOD80C	Public marking directory
PMLL4153	PHI	SOD80C	Public marking directory
PMLL4446	PHI	SOD80C	Public marking directory
PMLL4448	PHI	SOD80C	Public marking directory

How we narrow this down

1. Package first — SOT-23 vs SOD-123 vs SC-59 eliminates most candidates immediately.
2. Pin count and body size — a 3-pin SOT-23 LDO cannot be a 6-pin dual transistor.
3. Marking style — laser-marked parts are usually newer production; ink marking often indicates older or second-source vendors.
4. Circuits around it — a part sitting on a rail with an inductor is a regulator, not a diode.
5. Datasheet check — every credible candidate lists its marking scheme in the “marking information” section.

FAQ

• Same code, several parts — which one do I actually have? Compare package + pin count + surrounding circuit; if it still fits two parts, request a sample verification before production.
• Can I substitute between the candidates? No — the same marking may sit on electrically different parts. Always match the electrical spec sheet, not just the marking.
• Where do these mappings come from? Public SMD marking directories and historical stock tables; each row keeps its source so you can trace it.

Other codes starting with “B”

How these mappings are compiled: public SMD marking directories plus our own stock records. Each row keeps its original reference internally, so any mapping can be traced on request. Markings are indicative only — confirm with the physical batch marking and the original datasheet before ordering.