component

1SMA5940BT3G

Public Made by Adom

by adom

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

componentdiodes1sma5940bt3gfactory-2.0.0extractor-text
Overview Files Discover Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity
main
Download ZIP Propose a change
Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
Name Last commit message Last updated
docs Publish 0.1.0 · Ray 2d ago
viewers 1sma5940bt3g: viewers · Ray 2d ago
1sma5940bt3g-etched.glb Publish 0.1.0 · Ray 2d ago
1sma5940bt3g-etched.step 1sma5940bt3g: factory component page (tier=mfr) · Ray 2d ago
1sma5940bt3g-hero.glb 1sma5940bt3g: hero GLB from the etched model (keeps the MPN mark) · Ray 2d ago
1sma5940bt3g-hero.overlay.json Publish 0.1.0 · Ray 2d ago
1sma5940bt3g.glb Publish 0.1.0 · Ray 2d ago
1sma5940bt3g.kicad_mod Publish 0.1.0 · Ray 2d ago
1sma5940bt3g.kicad_sym Publish 0.1.0 · Ray 2d ago
1sma5940bt3g.lbr Publish 0.1.0 · Ray 2d ago
1sma5940bt3g.step Publish 0.1.0 · Ray 2d ago
package.json Publish 0.1.0 · Ray 2d ago
page.json Set visibility: public · Ray 2d ago
README.md Publish 0.1.0 · Ray 2d ago

1SMA5940BT3G

onsemi · Zener Diodes · SMA

1SMA5940BT3G from onsemi, in a SMA. 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 terminal, identified by the polarity band or molded polarity notch on the SMA package (CASE 403D, STYLE 1, pin 1).
2 ANODE passive Anode terminal of the Zener diode (CASE 403D, STYLE 1, pin 2), opposite the cathode band.

Key specifications

Parameter Value
Manufacturer onsemi
Package SMA
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), 43 V nominal, ±5% part VZ 40.85 43 45.15 V @ IZT = 8.7 mA, TA = 25°C (Note 4: guaranteed at thermal equilibrium) 2
Zener voltage tolerance -5 5 % Type number tolerance designation (Note 3) 2
Maximum Zener impedance ZZT 53 Ω @ IZT = 8.7 mA 2
Maximum Zener impedance ZZK 950 Ω @ IZK = 0.25 mA 2
Reverse leakage current IR 0.5 µA @ VR = 32.7 V 2
Maximum DC Zener current IZM 35 mA(dc) 2
Forward voltage VF 1.2 V @ IF = 200 mA 2
DC power dissipation (lead-referenced) PD 1.5 W TL = 75°C, measured zero lead length (Note 1); derate 20 mW/°C above 75°C 1
DC power dissipation (ambient) PD 0.5 W TA = 25°C (Note 2); derate 4.0 mW/°C above 25°C 1
Operating and storage temperature range TJ, Tstg -65 150 °C 1
Thermal resistance, junction-to-lead RJL 50 °C/W Junction-to-lead, 1 in² copper pad, FR-4 (Note 1) 1
Thermal resistance, junction-to-ambient RJA 250 °C/W Junction-to-ambient, FR-4 minimum recommended footprint (Note 2) 1

CAD (KiCad official)

  • Symbol: 1SMA5940BT3G
  • Footprint: Diode_SMD:D_SMA
  • 3D model: SMA (KiCad packages3D, STEP)
  • 3D model files: 1sma5940bt3g-etched.step / 1sma5940bt3g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1sma5940bt3g.step / 1sma5940bt3g.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (5 pp, sha256 718bfbda0fd2b50b, retrieved 2026-10-21, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-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