component
1SMA5939BT3G
Public Made by Adomby adom
onsemi Zener Diodes, SMA. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdown1SMA5939BT3G
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1sma5939bt3g.step/1sma5939bt3g.glbare 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, primaryclaude-haiku-5-5(text), consensusclaude-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).