component

BZX84C3V9

Public Made by Adom

by adom

FOSAN Zener Diodes, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BZX84C3V9

FOSAN · Zener Diodes · SOT-23

BZX84C3V9 from FOSAN, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 A passive Anode of the zener diode per the internal configuration drawing; BZX84C3V9 has VZ 3.9 V nominal (3.7-4.1 V) at IZ=5 mA.
2 NC unconnected Not connected internally; shown as an open terminal in the SOT-23 internal configuration drawing.
3 K passive Cathode of the zener diode per the internal configuration drawing; maximum power dissipation 300 mW at Ta=25℃ and forward current 250 mA max.

Key specifications

Parameter Value
Manufacturer FOSAN
Package SOT-23
Category Diodes
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Zener voltage VZ 3.7 3.9 4.1 V Iz=5 mA 2
Reverse leakage current IR 3 μA VR=1 V 2
Zener dynamic impedance ZZT 90 ohm Iz=5 mA 2
Zener knee impedance ZZK 600 ohm Iz=1.0 mA 2
Power dissipation PD 300 mW Ta=25℃ 1
Forward current IF 250 mA 1
Forward voltage VF 0.9 V IF=10 mA 1
Junction temperature TJ 125 ℃ 1
Storage temperature Tstg -55 125 ℃ 1

CAD (KiCad official)

  • Symbol: BZX84C3V9
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: bzx84c3v9-etched.step / bzx84c3v9-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bzx84c3v9.step / bzx84c3v9.glb are the bare package body.

Provenance

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

  • Datasheet: FOSAN datasheet (4 pp, sha256 120764175fb24186, retrieved 2026-10-16, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF