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1N4148

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Diodes Inc fast switching diode, DO-35. 100 V, 300 mA, 4 ns recovery. The through-hole 1N4148W. Datasheet-verified.

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1N4148

Diodes Incorporated · Small-signal switching diode · DO-35

The 1N4148 is the standard small-signal fast switching diode, in the axial DO-35 glass package, one of the most-used diodes ever made. It blocks 100 V, passes up to 300 mA, and recovers in about 4 nanoseconds, which is what makes it fast enough for logic, clamping, small rectification, steering, and flyback snubbing on tiny loads. It is the through-hole version of the surface-mount 1N4148W (SOD-123). The banded end is the cathode (pin 1).

Pinout

Pin Name Type Function
1 K passive Cathode terminal of the diode, identified by the printed band on the glass body (Polarity: Cathode Band). Blocks reverse current up to VR = 75V DC (VRM = 100V non-repetitive).
2 A passive Anode terminal of the diode. Conventional forward current flows into this lead toward the cathode; VF typ 0.62V min to 1.0V max at IF = 10mA (1N4148).

Key specifications

Parameter Value
Type Fast switching diode
Reverse voltage (VRRM) 100 V
Forward current (IF avg) 300 mA
Reverse recovery (trr) 4 ns
Forward voltage (VF) ~0.72 V at 10 mA
Peak surge (IFSM) 2 A
Marking band = cathode (pin 1)
Package DO-35 (axial glass)

Ordering variants

  • 1N4148-T (DO-35)
  • 1N4148TR (DO-35, tape & reel)

CAD (KiCad official)

  • Symbol: Diode:1N4148
  • Footprint: Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal
  • 3D model: DO-35 (KiCad packages3D)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Diodes Incorporated datasheet (2 pp, sha256 5549ceb4097e1393, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF