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1N4148: Fast Switching Diode — Datasheet & Buying Guide
1N4148 guide: 100V fast switching diode, DO-35, applications, equivalents and sourcing.
1N4148 guide: 100V fast switching diode, DO-35, applications, equivalents and sourcing.
The 1N4148 is the classic fast switching diode for signal applications. This guide covers its specs, uses and buying advice.
By Vigny (深圳市华芯购电子有限公司) · Published 2026-09-27 · Data verified 2026-09-29 · Sources: manufacturer datasheets & HuaXinGou stock verification
The 1N4148 is a 100V, 200mA fast switching diode with a reverse recovery time of about 4ns. It comes in DO-35 glass package and is manufactured by many brands.
It is used in signal clamping, logic circuits, flyback suppression for relays, rectification in small supplies and general-purpose switching.
1N4148W (SOD-123 SMD), 1N914, BAV99 (dual) and BAT54 (Schottky) are common substitutions depending on package and speed needs.
Because 1N4148 is cheap and ubiquitous, source from reputable distributors to avoid recycled parts. HuaXinGou provides original stock with batch traceability.
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