component
1SMA5939BT3G-MS
Public Made by Adomby adom
MSKSEMI Zener Diodes, SMA. 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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1SMA5939BT3G-MS
MSKSEMI · Zener Diodes · SMA
1SMA5939BT3G-MS from MSKSEMI, 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 | 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 | MSKSEMI |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse Zener Voltage | VZ | 37.05 | 39 | 40.95 | V | @ IZT | 3 |
| Maximum Zener Impedance | ZZT | 45 | Ω | @ IZT | 3 | ||
| Maximum Zener Impedance | ZZK | 900 | Ω | @ IZK | 3 | ||
| Reverse Leakage Current | IR | 0.5 | μA | @ VR | 3 | ||
| Maximum DC Zener Current | IZM | 38 | mA(dc) | 3 | |||
| Forward Voltage | VF | 1.2 | V | @ IF = 200 mA | 3 | ||
| Zener voltage tolerance (type number designation) | -5 | 5 | % | Type number indicates ±5% tolerance (Note 3) | 3 | ||
| DC Power Dissipation | PD | 1.5 | W | TL = 75°C, measured zero lead length (Note 1) | 2 | ||
| DC Power Dissipation | PD | 0.5 | W | TA = 25°C (Note 2) | 2 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 2 | ||
| Thermal Resistance, Junction-to-Lead | RθJL | 50 | °C/W | 2 | |||
| Thermal Resistance, Junction-to-Ambient | RθJA | 250 | °C/W | 2 |
CAD (KiCad official)
- Symbol:
1SMA5939BT3G-MS - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
1sma5939bt3g-ms-etched.step/1sma5939bt3g-ms-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1sma5939bt3g-ms.step/1sma5939bt3g-ms.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MSKSEMI datasheet (7 pp, sha256
84b58db054664c6f, retrieved 2026-10-15, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarycathode-band convention(convention), consensusoff(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).
# 1SMA5939BT3G-MS
**MSKSEMI** · Zener Diodes · SMA
1SMA5939BT3G-MS from MSKSEMI, 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 | 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 | MSKSEMI |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse Zener Voltage | VZ | 37.05 | 39 | 40.95 | V | @ IZT | 3 |
| Maximum Zener Impedance | ZZT | | | 45 | Ω | @ IZT | 3 |
| Maximum Zener Impedance | ZZK | | | 900 | Ω | @ IZK | 3 |
| Reverse Leakage Current | IR | | | 0.5 | μA | @ VR | 3 |
| Maximum DC Zener Current | IZM | | | 38 | mA(dc) | | 3 |
| Forward Voltage | VF | | | 1.2 | V | @ IF = 200 mA | 3 |
| Zener voltage tolerance (type number designation) | | -5 | | 5 | % | Type number indicates ±5% tolerance (Note 3) | 3 |
| DC Power Dissipation | PD | | | 1.5 | W | TL = 75°C, measured zero lead length (Note 1) | 2 |
| DC Power Dissipation | PD | | | 0.5 | W | TA = 25°C (Note 2) | 2 |
| Operating and Storage Temperature Range | TJ, Tstg | -65 | | 150 | °C | | 2 |
| Thermal Resistance, Junction-to-Lead | RθJL | | | 50 | °C/W | | 2 |
| Thermal Resistance, Junction-to-Ambient | RθJA | | | 250 | °C/W | | 2 |
## CAD (KiCad official)
- Symbol: `1SMA5939BT3G-MS`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `1sma5939bt3g-ms-etched.step` / `1sma5939bt3g-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1sma5939bt3g-ms.step` / `1sma5939bt3g-ms.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [MSKSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603115129127260160) (7 pp, sha256 `84b58db054664c6f`, retrieved 2026-10-15, tier: lcsc)
- **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](docs/1sma5939bt3g-ms-datasheet.pdf)