Find equivalent and drop-in replacement parts across 31 semiconductor manufacturers. The definitive archive of manufacturer cross-reference guides, SMD marking codes, and industry-standard equivalence tables — free to download, always available.
The most-searched equivalent-part queries from engineers and buyers on our library this month. Each links to a full replacement table with verified specifications.
NPN power transistor — equivalents include MJ3055, KSE3055, BUX48, and BD249C.
Quad op-amp equivalents: TL074, LM2902, HA17324, MC3403, KA324.
General-purpose NPN: 2N2222, 2N3904, BC337, BC338, KSC945, S8050.
Medium-power NPN equivalents: BD139, MJE3055, KSE13007, TIP31C.
N-channel power MOSFET: STP55NF06, FQP50N06, BUZ71A, IRFZ44N.
Two-, three-, and four-digit SOT-23 and SOT-323 marking codes.
Legacy and current semiconductor manufacturers with dedicated cross-reference guides. Click any brand to view its equivalence tables, marking codes, and product cross-references.
Before ordering a substitute, verify the replacement matches on electrical, mechanical, and thermal parameters. A cross-reference is a starting point — not a guarantee of drop-in compatibility.
Industry-standard ratings for cross-reference matches:
Every cross-reference in this library was published by the original semiconductor manufacturer. For obsolete or hard-to-source parts, Hybrid Electronics maintains excess-inventory stock from OEM/CEM channels — contact our sourcing team for verified alternatives.
Complete archive of every cross-reference, marking-code catalog, and equivalence table in the library. Filter by manufacturer or component category to narrow the list.
| Document | Manufacturer | Category | Type | Size | |
|---|---|---|---|---|---|
| Loading catalog… | |||||
Common questions about finding equivalent semiconductor parts. Answers written by Hybrid Electronics' sourcing team.
A cross-reference is a table that maps one manufacturer's part number to an equivalent or drop-in replacement from another manufacturer. Equivalents are matched on electrical parameters (voltage, current, gain), mechanical parameters (package, pinout), and thermal parameters (junction temperature, thermal resistance). Always verify the replacement's datasheet before designing it in.
Start with the original manufacturer's cross-reference guide — the tables in this library are the most authoritative source. If the manufacturer is defunct (Sescosem, Goldstar semiconductors, older Motorola discretes), consult industry-standard equivalents (NTE, ECG). For hard-to-source obsolete parts, Hybrid Electronics maintains OEM/CEM excess inventory with over 500,000 verified stock lines — request a quote for any part number.
Yes. All 77 documents are free to download without registration. They are archived from original manufacturer publications and are provided as a service to the electronics engineering community.
The guides span the full history of each manufacturer — some go back to the 1980s and 1990s (Sescosem, Motorola discrete, Hitachi transistors). This makes them uniquely valuable for supporting legacy designs, military and aerospace repair, and industrial equipment maintenance where original parts are no longer produced. Always confirm current stock and specifications with Hybrid Electronics before ordering.
Yes. Hybrid Electronics is an independent distributor specializing in obsolete, hard-to-find, and excess-inventory semiconductor components. Submit an RFQ with the part number and we typically respond within four business hours with stock availability, pricing, and lead-time. We source from authorized excess-inventory channels, OEMs, CEMs, and vetted global partners.
A drop-in replacement matches the original on package, pinout, and all electrical specifications within manufacturer tolerance — no board changes required. A functional equivalent performs the same electrical function but may differ in package, pinout, or minor specs (e.g. slightly higher voltage rating). Functional equivalents require engineering review before use.
Our sourcing team maintains OEM/CEM excess inventory across 500,000+ part lines. Submit an RFQ and get verified stock, pricing, and lead-time within 4 business hours.
Request a Quote →