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1SMA5939BT3G

Public Made by Adom

by adom

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

componentdiodes1sma5939bt3gfactory-2.0.0extractor-text
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1SMA5939BT3G

onsemi · Zener Diodes · SMA

1SMA5939BT3G 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 on the SMA body (Style 1: pin 1 is the cathode polarity band), and the Zener regulating terminal of the device.
2 ANODE passive Anode terminal, the terminal opposite the cathode band on the SMA package (Style 1: pin 2 is the anode).

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 37.05 39 40.95 V @ IZT = 9.6 mA 2
Maximum zener impedance ZZT 45 Ω @ IZT = 9.6 mA 2
Maximum zener impedance ZZK 900 Ω @ IZK = 0.25 mA 2
Reverse leakage current IR 0.5 µA @ VR = 29.7 V 2
Maximum DC zener current IZM 38 mA(dc) 2
Forward voltage VF 1.2 V @ IF = 200 mA, all types 2
Zener voltage tolerance designation -5 5 % Note 3: type number indicates ±5% tolerance 2
DC power dissipation at TL PD 1.5 W TL = 75°C, measured zero lead length (Note 1) 1
DC power dissipation at TA PD 0.5 W TA = 25°C (Note 2) 1
Operating and storage temperature range TJ, Tstg -65 150 °C 1
Thermal resistance, junction-to-lead RJL 50 °C/W Measured zero lead length (Note 1) 1
Thermal resistance, junction-to-ambient RJA 250 °C/W FR-4 board, minimum recommended footprint (Note 2) 1

CAD (KiCad official)

  • Symbol: 1SMA5939BT3G
  • Footprint: Diode_SMD:D_SMA
  • 3D model: SMA (KiCad packages3D, STEP)
  • 3D model files: 1sma5939bt3g-etched.step / 1sma5939bt3g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1sma5939bt3g.step / 1sma5939bt3g.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (6 pp, sha256 f462474d29a69587, 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