component
SZ1SMB5918BT3G
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.
main
SZ1SMB5918BT3G
onsemi · Zener Diodes · SMB
SZ1SMB5918BT3G 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 5.1 V, ±5%) | VZ | 4.84 | 5.1 | 5.36 | V | @ IZT = 73.5 mA; TL = 30°C unless otherwise noted | 3 |
| Zener voltage tolerance (type number designation) | -5 | 5 | % | Type numbers indicate ±5% tolerance | 3 | ||
| Maximum Zener impedance | ZZT | 4 | Ω | @ IZT; AC 0.1 IZ(dc) at 60 Hz | 3 | ||
| Maximum Zener impedance | ZZK | 350 | Ω | @ IZK; AC 0.1 IZ(dc) at 60 Hz | 3 | ||
| Maximum DC Zener current | IZM | 294 | mA(dc) | 3 | |||
| Maximum steady state power dissipation | PD | 3 | W | @ TL = 75°C; measured at zero lead length | 1 | ||
| Maximum steady state power dissipation | PD | 550 | mW | @ TA = 25°C; FR-4 board, recommended footprint (Note 1) | 1 | ||
| Operating and storage temperature range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Zener test current | IZT | 73.5 | mA | Test current for VZ and ZZT | 3 | ||
| Zener test current at knee | IZK | 1 | mA | Test current for ZZK | 3 | ||
| Reverse leakage current | IR | 5 | A | @ VR = 2 V | 3 | ||
| Reverse voltage (leakage test) | VR | 2 | V | Test voltage for IR | 3 | ||
| Power derating above TL = 75°C | PD | 25 | mW/°C | Derate above 75°C | 1 | ||
| Power derating above TA = 25°C | PD | 4.4 | mW/°C | Derate above 25°C | 1 | ||
| Thermal resistance, junction-to-lead | RJL | 40 | °C/W | Measured at zero lead length | 1 | ||
| Thermal resistance, junction-to-ambient | RJA | 226 | °C/W | FR-4 board, recommended footprint (Note 1) | 1 |
CAD (KiCad official)
- Symbol:
SZ1SMB5918BT3G - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
sz1smb5918bt3g-etched.step/sz1smb5918bt3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1smb5918bt3g.step/sz1smb5918bt3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (7 pp, sha256
a7347185b46458b7, retrieved 2026-10-16, 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).
# SZ1SMB5918BT3G
**onsemi** · Zener Diodes · SMB
SZ1SMB5918BT3G 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 5.1 V, ±5%) | VZ | 4.84 | 5.1 | 5.36 | V | @ IZT = 73.5 mA; TL = 30°C unless otherwise noted | 3 |
| Zener voltage tolerance (type number designation) | | -5 | | 5 | % | Type numbers indicate ±5% tolerance | 3 |
| Maximum Zener impedance | ZZT | | | 4 | Ω | @ IZT; AC 0.1 IZ(dc) at 60 Hz | 3 |
| Maximum Zener impedance | ZZK | | | 350 | Ω | @ IZK; AC 0.1 IZ(dc) at 60 Hz | 3 |
| Maximum DC Zener current | IZM | | | 294 | mA(dc) | | 3 |
| Maximum steady state power dissipation | PD | | | 3 | W | @ TL = 75°C; measured at zero lead length | 1 |
| Maximum steady state power dissipation | PD | | | 550 | mW | @ TA = 25°C; FR-4 board, recommended footprint (Note 1) | 1 |
| Operating and storage temperature range | TJ, Tstg | -65 | | 150 | °C | | 1 |
| Zener test current | IZT | | 73.5 | | mA | Test current for VZ and ZZT | 3 |
| Zener test current at knee | IZK | | 1 | | mA | Test current for ZZK | 3 |
| Reverse leakage current | IR | | 5 | | A | @ VR = 2 V | 3 |
| Reverse voltage (leakage test) | VR | | 2 | | V | Test voltage for IR | 3 |
| Power derating above TL = 75°C | PD | | 25 | | mW/°C | Derate above 75°C | 1 |
| Power derating above TA = 25°C | PD | | 4.4 | | mW/°C | Derate above 25°C | 1 |
| Thermal resistance, junction-to-lead | RJL | | 40 | | °C/W | Measured at zero lead length | 1 |
| Thermal resistance, junction-to-ambient | RJA | | 226 | | °C/W | FR-4 board, recommended footprint (Note 1) | 1 |
## CAD (KiCad official)
- Symbol: `SZ1SMB5918BT3G`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)
- 3D model files: `sz1smb5918bt3g-etched.step` / `sz1smb5918bt3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sz1smb5918bt3g.step` / `sz1smb5918bt3g.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590448108623859712) (7 pp, sha256 `a7347185b46458b7`, retrieved 2026-10-16, 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/sz1smb5918bt3g-datasheet.pdf)