component
1SMB5946BT3G
Public Made by Adomby adom
onsemi Zener Diodes, SMB. 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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1SMB5946BT3G
onsemi · Zener Diodes · SMB
1SMB5946BT3G from onsemi, in a SMB. 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 | onsemi |
| Package | SMB |
| 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 (nominal 75 V, 5% type) | VZ | 71.25 | 75 | 78.75 | V | @ IZT = 5 mA; TL = 30°C; nominal measured at 25°C | 3 |
| Type number tolerance | -5 | 5 | % | Type numbers indicate ±5% (Note 2) | 3 | ||
| Maximum Zener Impedance | ZZT | 140 | ohm | @ IZT = 5 mA; AC = 0.1 IZ(dc), 60 Hz | 3 | ||
| Maximum Zener Impedance | ZZK | 2000 | ohm | @ IZK = 0.25 mA; AC = 0.1 IZ(dc), 60 Hz | 3 | ||
| Maximum DC Zener Current | IZM | 20 | mA(dc) | 3 | |||
| Maximum Steady State Power Dissipation | PD | 3 | W | TL = 75°C, measured at zero lead length; derate 25 mW/°C above 75°C | 1 | ||
| Maximum Steady State Power Dissipation (ambient) | PD | 550 | mW | TA = 25°C, FR-4 board, recommended footprint (Note 1); derate 4.4 mW/°C above 25°C | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Reverse Leakage Current | IR | 1 | µA | @ VR = 56 V | 3 | ||
| Thermal Resistance, Junction-to-Lead | RθJL | 40 | °C/W | Measured at zero lead length | 1 | ||
| Thermal Resistance, Junction-to-Ambient | RθJA | 226 | °C/W | FR-4 board, recommended footprint (Note 1) | 1 |
CAD (KiCad official)
- Symbol:
1SMB5946BT3G - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
1smb5946bt3g-etched.step/1smb5946bt3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1smb5946bt3g.step/1smb5946bt3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (6 pp, sha256
e95f4deeabd8ea97, retrieved 2026-10-22, tier: manufacturer) - 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).
# 1SMB5946BT3G
**onsemi** · Zener Diodes · SMB
1SMB5946BT3G from onsemi, in a SMB. 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 | onsemi |
| Package | SMB |
| 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 (nominal 75 V, 5% type) | VZ | 71.25 | 75 | 78.75 | V | @ IZT = 5 mA; TL = 30°C; nominal measured at 25°C | 3 |
| Type number tolerance | | -5 | | 5 | % | Type numbers indicate ±5% (Note 2) | 3 |
| Maximum Zener Impedance | ZZT | | | 140 | ohm | @ IZT = 5 mA; AC = 0.1 IZ(dc), 60 Hz | 3 |
| Maximum Zener Impedance | ZZK | | | 2000 | ohm | @ IZK = 0.25 mA; AC = 0.1 IZ(dc), 60 Hz | 3 |
| Maximum DC Zener Current | IZM | | | 20 | mA(dc) | | 3 |
| Maximum Steady State Power Dissipation | PD | | | 3 | W | TL = 75°C, measured at zero lead length; derate 25 mW/°C above 75°C | 1 |
| Maximum Steady State Power Dissipation (ambient) | PD | | | 550 | mW | TA = 25°C, FR-4 board, recommended footprint (Note 1); derate 4.4 mW/°C above 25°C | 1 |
| Operating and Storage Temperature Range | TJ, Tstg | -65 | | 150 | °C | | 1 |
| Reverse Leakage Current | IR | | 1 | | µA | @ VR = 56 V | 3 |
| Thermal Resistance, Junction-to-Lead | RθJL | | 40 | | °C/W | Measured at zero lead length | 1 |
| Thermal Resistance, Junction-to-Ambient | RθJA | | 226 | | °C/W | FR-4 board, recommended footprint (Note 1) | 1 |
## CAD (KiCad official)
- Symbol: `1SMB5946BT3G`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)
- 3D model files: `1smb5946bt3g-etched.step` / `1smb5946bt3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1smb5946bt3g.step` / `1smb5946bt3g.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/1smb5946bt3-d.pdf) (6 pp, sha256 `e95f4deeabd8ea97`, retrieved 2026-10-22, tier: manufacturer)
- **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/1smb5946bt3g-datasheet.pdf)