component

1SMB5939BT3G

Public Made by Adom

by adom

onsemi Zener Diodes, SMB. 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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1SMB5939BT3G

onsemi · Zener Diodes · SMB

1SMB5939BT3G from onsemi, 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 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 onsemi
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 VZ 37.05 39 40.95 V @ IZT = 9.6 mA (for this part) 3
Zener voltage tolerance (type number designation) -5 5 % Type numbers indicate a tolerance of ±5% 3
Maximum Zener Impedance ZZT 45 ohm @ IZT = 9.6 mA 3
Maximum Zener Impedance ZZK 900 ohm @ IZK = 0.25 mA 3
Reverse Leakage Current IR 1 µA @ VR = 29.7 V 3
Maximum DC Zener Current IZM 38 mA(dc) 3
Reverse Zener test current IZT 9.6 mA Test current for VZ, ZZT 3
Forward Voltage VF 1.5 V @ IF = 200 mA(dc), for all types 3
Maximum Steady State Power Dissipation @ TL = 75°C PD 3 W Measured at zero lead length; derate 25 mW/°C above 75°C 1
Maximum Steady State Power Dissipation @ TA = 25°C PD 550 mW FR-4 board, recommended footprint (Note 1); derate 4.4 mW/°C above 25°C 1
Thermal Resistance Junction-to-Lead RJL 40 °C/W Junction-to-lead 1
Thermal Resistance Junction-to-Ambient RJA 226 °C/W Junction-to-ambient (Note 1) 1
Operating and Storage Temperature Range TJ, Tstg -65 150 °C 1

CAD (KiCad official)

  • Symbol: 1SMB5939BT3G
  • Footprint: Diode_SMD:D_SMB
  • 3D model: SMB (KiCad packages3D, STEP)
  • 3D model files: 1smb5939bt3g-etched.step / 1smb5939bt3g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1smb5939bt3g.step / 1smb5939bt3g.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (6 pp, sha256 e95f4deeabd8ea97, retrieved 2026-10-29, tier: manufacturer)
  • 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