component

1SMB5949BT3G

Public Made by Adom

by adom

FUXINSEMI Zener Diodes, SMB(DO-214AA). Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, 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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1SMB5949BT3G

FUXINSEMI · Zener Diodes · SMB(DO-214AA)

1SMB5949BT3G from FUXINSEMI, in a SMB(DO-214AA). 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 K passive Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint.
2 A passive Anode.

Key specifications

Parameter Value
Manufacturer FUXINSEMI
Package SMB(DO-214AA)
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 (5% tolerance, suffix B) VZ 95 100 105 V @ IZT 3.7 mA 2
Zener voltage tolerance (suffix B) -5 5 % Suffix B indicates 5% tolerance 2
Zener impedance ZZT 250 Ω @ IZT 3.7 mA 2
Zener impedance at knee ZZK 3100 Ω @ IZK 0.25 mA 2
Reverse leakage current IR 1 µA @ VR 76 V 2
Maximum zener current IZM 15 mA 2
Maximum forward voltage VF 1.5 V IF = 200 mA 1
Maximum steady state power dissipation PD 3 W TL = 75°C, measured at zero lead length 1
Derate above 75 °C 40 mW/°C Above TL = 75°C 1
Thermal resistance, junction to lead RθJL 25 °C/W 1
Maximum steady state power dissipation at Ta PD 550 mW Ta = 25 °C, measured at zero lead length 1
Derate above 25 °C 4.4 mW/°C Above Ta = 25°C 1
Thermal resistance, junction to ambient RθJA 226 °C/W 1
Junction temperature range TJ -65 150 °C 1
Storage temperature range Tstg -65 150 °C 1

CAD (KiCad official)

  • Symbol: 1SMB5949BT3G
  • Footprint: Diode_SMD:D_SMB
  • 3D model: SMB(DO-214AA) (KiCad packages3D, STEP)
  • 3D model files: 1smb5949bt3g-etched.step / 1smb5949bt3g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1smb5949bt3g.step / 1smb5949bt3g.glb are the bare package body.

Provenance

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

  • Datasheet: FUXINSEMI datasheet (4 pp, sha256 470df46c5bbb123a, retrieved 2026-10-21, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary cathode-band convention (convention), consensus off (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