component

1SMB5945B

Public Made by Adom

by adom

BORN Zener Diodes, SMB(DO-214AA). 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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1SMB5945B

BORN · Zener Diodes · SMB(DO-214AA)

1SMB5945B from BORN, 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, marked by the color band on the SMB (DO-214AA) body; for 1SMB5945B the Zener voltage is 64.6 V min to 71.4 V max at IZT = 5.5 mA, and maximum DC Zener current is 22 mA.
2 A passive Anode terminal of the Zener diode; the datasheet gives a maximum forward voltage of 1.2 V at IF = 200 mA and 3 W power dissipation at TL = 75°C.

Key specifications

Parameter Value
Manufacturer BORN
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 VZ 64.6 71.4 V IZT=5.5 mA 3
Test current IZT 5.5 mA 3
Dynamic impedance ZZT 120 Ω 3
Knee impedance ZZK 1700 Ω IZK=0.25 mA 3
Reverse current IR 1 µAdc VR=51.7 V 3
Max DC current IZM 22 mA 3
Power Dissipation PD 3 W TL=75°C 1
Thermal Resistance Junction To Ambient Air RθJA 100 °C/W 1
Thermal Resistance Junction To Leads RθJL 25 °C/W 1
Storage Temperature Range TSTG -55 150 °C 1
Operating Junction Temperature Range TJ -55 150 °C 1
Forward Voltage VF 1.2 V IF=200 mA 1

CAD (KiCad official)

  • Symbol: 1SMB5945B
  • Footprint: Diode_SMD:D_SMB
  • 3D model: SMB(DO-214AA) (KiCad packages3D, STEP)
  • 3D model files: 1smb5945b-etched.step / 1smb5945b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1smb5945b.step / 1smb5945b.glb are the bare package body.

Provenance

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

  • Datasheet: BORN datasheet (5 pp, sha256 d157179bacadcf36, 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