component
SZ1SMA5918BT3G
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onsemi Zener Diodes, SMA. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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SZ1SMA5918BT3G
onsemi · Zener Diodes · SMA
SZ1SMA5918BT3G 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 (polarity band) of the 5.1 V Zener diode, which is positive for reverse Zener regulation, with VZ 4.84-5.36 V at IZT = 73.5 mA. |
| 2 | ANODE | passive | Anode of the Zener diode; the package style 1 lists it as pin 2, opposite the cathode band. |
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 | 4.84 | 5.1 | 5.36 | V | @ IZT, TA = 25°C | 2 |
| Zener Test Current | IZT | 73.5 | mA | TA = 25°C | 2 | ||
| Maximum Zener Impedance | ZZT | 4 | Ω | @ IZT = 73.5 mA | 2 | ||
| Maximum Zener Impedance (knee) | ZZK | 350 | Ω | @ IZK = 1.0 mA | 2 | ||
| Reverse Leakage Current | IR | 2.5 | µA | @ VR = 2.0 V | 2 | ||
| Maximum DC Zener Current | IZM | 294 | mA | 2 | |||
| Forward Voltage | VF | 1.2 | V | IF = 200 mA, all types | 2 | ||
| Zener Voltage Tolerance | -5 | 5 | % | Note 3: type number indicates a tolerance of ±5% | 2 | ||
| DC Power Dissipation (lead) | PD | 1.5 | W | TL = 75°C, zero lead length, 1 in square copper pad FR-4 | 1 | ||
| Derating above 75°C | 20 | mW/°C | Above TL = 75°C | 1 | |||
| Thermal Resistance, Junction-to-Lead | RθJL | 50 | °C/W | 1 | |||
| DC Power Dissipation (ambient) | PD | 0.5 | W | TA = 25°C, FR-4 board, minimum recommended footprint | 1 | ||
| Derating above 25°C | 4 | mW/°C | Above TA = 25°C | 1 | |||
| Thermal Resistance, Junction-to-Ambient | RθJA | 250 | °C/W | 1 | |||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
SZ1SMA5918BT3G - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
sz1sma5918bt3g-etched.step/sz1sma5918bt3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1sma5918bt3g.step/sz1sma5918bt3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (5 pp, sha256
718bfbda0fd2b50b, retrieved 2026-10-23, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).
# SZ1SMA5918BT3G
**onsemi** · Zener Diodes · SMA
SZ1SMA5918BT3G 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 (polarity band) of the 5.1 V Zener diode, which is positive for reverse Zener regulation, with VZ 4.84-5.36 V at IZT = 73.5 mA. |
| 2 | ANODE | passive | Anode of the Zener diode; the package style 1 lists it as pin 2, opposite the cathode band. |
## 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 | 4.84 | 5.1 | 5.36 | V | @ IZT, TA = 25°C | 2 |
| Zener Test Current | IZT | | 73.5 | | mA | TA = 25°C | 2 |
| Maximum Zener Impedance | ZZT | | | 4 | Ω | @ IZT = 73.5 mA | 2 |
| Maximum Zener Impedance (knee) | ZZK | | | 350 | Ω | @ IZK = 1.0 mA | 2 |
| Reverse Leakage Current | IR | | | 2.5 | µA | @ VR = 2.0 V | 2 |
| Maximum DC Zener Current | IZM | | | 294 | mA | | 2 |
| Forward Voltage | VF | | | 1.2 | V | IF = 200 mA, all types | 2 |
| Zener Voltage Tolerance | | -5 | | 5 | % | Note 3: type number indicates a tolerance of ±5% | 2 |
| DC Power Dissipation (lead) | PD | | | 1.5 | W | TL = 75°C, zero lead length, 1 in square copper pad FR-4 | 1 |
| Derating above 75°C | | | 20 | | mW/°C | Above TL = 75°C | 1 |
| Thermal Resistance, Junction-to-Lead | RθJL | | 50 | | °C/W | | 1 |
| DC Power Dissipation (ambient) | PD | | | 0.5 | W | TA = 25°C, FR-4 board, minimum recommended footprint | 1 |
| Derating above 25°C | | | 4 | | mW/°C | Above TA = 25°C | 1 |
| Thermal Resistance, Junction-to-Ambient | RθJA | | 250 | | °C/W | | 1 |
| Operating and Storage Temperature Range | TJ, Tstg | -65 | | 150 | °C | | 1 |
## CAD (KiCad official)
- Symbol: `SZ1SMA5918BT3G`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `sz1sma5918bt3g-etched.step` / `sz1sma5918bt3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sz1sma5918bt3g.step` / `sz1sma5918bt3g.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/sz1sma5918bt3-d.pdf) (5 pp, sha256 `718bfbda0fd2b50b`, retrieved 2026-10-23, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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](docs/sz1sma5918bt3g-datasheet.pdf)