Diotec

Diotec Semiconductor is a German discrete-semiconductor specialist, and the profiles here span its four core lines: axial-lead rectifiers, small-signal and Schottky diodes, through-hole transistors and surface-mount transistors. The rectifier line covers the 1N4002 (100 V), 1N4003 (200 V), 1N4004 (400 V), 1N4005 (600 V), 1N4006 (800 V) and 1N4007 (1000 V) general-purpose diodes (all DO-41), the 1N5408 3 A / 1000 V rectifier in DO-201 for higher-current bridge stages, and the UF5408 ultrafast rectifier (3 A, 1000 V, trr 75 ns, DO-201) for switching supplies. The small-signal line adds the BAT54 Schottky switching diode (SOT-23). The TO-92 transistors are the 2N3904, the 2N4401 (40 V, 600 mA) with its PNP complement 2N4403, the BC546B (65 V), BC547B (45 V) and BC549C (30 V) NPN types with PNP complements BC557B and BC548B — and the surface-mount line adds the MMBT3904, MMBT3906, MMBT2222A and MMBT4401 in SOT-23. Confirm the complete part number against the BOM before quoting.

Sourcing notes for Diotec parts. Always quote the complete manufacturer ordering code — package, temperature grade, speed or accuracy grade, and packing (reel, tube or tray) all change availability and price, and suffixes are where most mismatches happen. Check the lifecycle status on the manufacturer site before committing to a multi-year build; parts flagged not-recommended or obsolete need a last-time-buy plan or a verified alternate lined up early. With every offer, request traceability documents — date code, lot code and original packing — and confirm the inspection steps your supplier applies to high-risk lots.