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Diodes
7 components in this category · Sourced from authorized channels · 24-hour quotes
Diodes are the simplest and most ubiquitous semiconductor device — they conduct current in one direction and block it in the other. The 1N4148 is the universal high-speed switching diode, found in virtually every electronic design ever built: freewheel protection on relays, signal clipping and clamping, voltage doublers, ESD steering, and reverse-polarity protection. Rated for 100 V reverse voltage, 200 mA forward current and 4 ns reverse recovery, it is available in through-hole DO-35 glass and surface-mount SOD-123, SOD-323 and MELF packages. Fully second-sourced across Nexperia, onsemi, Vishay, Diodes Inc, ST and ROHM, with pricing so competitive that counterfeit risk is low when buying from authorized channels.
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Diodes – Frequently Asked Questions
1N4148 vs 1N4001 — can they be interchanged?
Not usually. The 1N4001 is a 50 V / 1 A rectifier with 30 µs reverse recovery — 7,500× slower than the 1N4148. Use 1N4001 for mains rectification and slow switching; use 1N4148 for signal applications, high-speed switching and small flyback duties. The 1N4148 cannot handle 1 A continuous; the 1N4001 cannot switch cleanly above 1 kHz.
Can I use the 1N4148 as a flyback diode on a relay?
Yes, for small relays with coil current under 100 mA (like 5 V signal relays). For larger relays (12 V, 200+ mA), use a 1N4001 or a Schottky SS34 to handle the initial surge current when the magnetic field collapses.
Is the 1N4148 a Schottky diode?
No — it is a standard PN junction silicon diode with 1 V forward drop at 10 mA. Schottky equivalents include the BAT54 (30 V, 200 mA, 0.25 V forward drop) and 1N5817 (20 V, 1 A, 0.45 V forward drop). Use Schottky when you need lower forward voltage or faster recovery, but note that Schottkys have much higher reverse leakage current.
What package should I choose for surface-mount assembly?
SOD-123 (1N4148W) is the most common SMT package — same footprint as many other small-signal diodes, easy to hand-solder and reflow. SOD-323 (1N4148WS) is smaller for high-density boards. MELF (LL4148) is cylindrical and used in some legacy designs. For new designs, standardize on SOD-123.
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