component

1SMB5349B

Public Made by Adom

by adom

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

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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1SMB5349B

YFW · Zener Diodes · SMB

1SMB5349B from YFW, in a SMB. 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 Cathode passive Cathode of the zener diode; operated at positive reverse voltage for regulation (zener voltage 3.3V to 200V series, 12 V for 1SMB5349B).
2 Anode passive Anode of the zener diode; maximum forward voltage 1.2 V at IF = 1.0 A.

Key specifications

Parameter Value
Manufacturer YFW
Package SMB
Category Diodes
Pins 2

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 tolerance (suffix B) VZ -5 5 % Suffix B indicates ±5% tolerance 2
Nominal zener voltage VZ 12 V @ IZT 2
Maximum zener impedance ZZT 2.5 Ω @ IZT = 100 mA 2
Maximum zener impedance at knee ZZK 125 Ω @ IZK = 1.0 mA 2
Maximum reverse leakage current IR 2 μA @ VR = 9.1 V 2
Maximum zener current IZM 395 mA 2
Maximum surge current IZSM 7.5 A Non-recurrent half-sine wave, 8.3 ms 2
Maximum regulator voltage ΔVZ 0.25 V 2
Maximum forward voltage VF 1.2 V IF = 1.0 A 1
Power dissipation PD 5 W TL = 25 °C 1
Operating and storage temperature range TJ, TSTG -65 150 °C 1
Thermal resistance, junction to ambient RθJA 90 °C/W Mounted on FR4 PC board (1 oz Cu) with recommended footprint 1
Thermal resistance, junction to lead RθJL 25 °C/W Mounted on FR4 PC board (1 oz Cu) with recommended footprint 1
Test current IZT 100 mA 2

CAD (KiCad official)

  • Symbol: 1SMB5349B
  • Footprint: Diode_SMD:D_SMB
  • 3D model: SMB (KiCad packages3D, STEP)
  • 3D model files: 1smb5349b-etched.step / 1smb5349b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1smb5349b.step / 1smb5349b.glb are the bare package body.

Provenance

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

  • Datasheet: YFW datasheet (3 pp, sha256 24001c3c727b3300, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-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