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1SMB3EZ5.1
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SUNMATE Elec Zener Diodes, SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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1SMB3EZ5.1
SUNMATE Elec · Zener Diodes · SMB
1SMB3EZ5.1 from SUNMATE Elec, 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 terminal, identified by the cathode band or notch; the Zener voltage for the 5.1 V type is 5.1 V at IZT = 147 mA. |
| 2 | A | passive | Anode terminal, opposite the cathode band; maximum forward voltage is 1.5 V at IF = 200 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | SUNMATE Elec |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener Impedance at IZT | ZZT | 3.5 | Ω | @ IZT = 147 mA | 2 | ||
| Zener Impedance at IZK | ZZK | 550 | Ω | @ IZK = 1.0 mA | 2 | ||
| Maximum Reverse Leakage Current | IR | 5 | μA | @ VR = 1.0 V | 2 | ||
| Maximum DC Zener Current | IZM | 520 | mA | 2 | |||
| DC Power Dissipation | PD | 3 | Watts | TL = 75 °C (Note1) | 1 | ||
| Maximum Forward Voltage | VF | 1.5 | Volts | IF = 200 mA | 1 | ||
| Thermal Resistance Junction to Ambient Air | RθJA | 60 | K / W | Note2 | 1 | ||
| Junction Temperature Range | TJ | -55 | 175 | °C | 1 | ||
| Storage Temperature Range | Ts | -55 | 175 | °C | 1 | ||
| Nominal Zener Voltage | VZ | 5.1 | V | @ IZT = 147 mA | 2 | ||
| Zener Test Current | IZT | 147 | mA | 2 |
CAD (KiCad official)
- Symbol:
1SMB3EZ5.1 - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
1smb3ez5-1-etched.step/1smb3ez5-1-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1smb3ez5-1.step/1smb3ez5-1.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: SUNMATE Elec datasheet (3 pp, sha256
c7ffa07f96057398, retrieved 2026-10-22, tier: lcsc) - 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).
# 1SMB3EZ5.1
**SUNMATE Elec** · Zener Diodes · SMB
1SMB3EZ5.1 from SUNMATE Elec, 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 terminal, identified by the cathode band or notch; the Zener voltage for the 5.1 V type is 5.1 V at IZT = 147 mA. |
| 2 | A | passive | Anode terminal, opposite the cathode band; maximum forward voltage is 1.5 V at IF = 200 mA. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | SUNMATE Elec |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener Impedance at IZT | ZZT | | | 3.5 | Ω | @ IZT = 147 mA | 2 |
| Zener Impedance at IZK | ZZK | | | 550 | Ω | @ IZK = 1.0 mA | 2 |
| Maximum Reverse Leakage Current | IR | | | 5 | μA | @ VR = 1.0 V | 2 |
| Maximum DC Zener Current | IZM | | | 520 | mA | | 2 |
| DC Power Dissipation | PD | | | 3 | Watts | TL = 75 °C (Note1) | 1 |
| Maximum Forward Voltage | VF | | | 1.5 | Volts | IF = 200 mA | 1 |
| Thermal Resistance Junction to Ambient Air | RθJA | | | 60 | K / W | Note2 | 1 |
| Junction Temperature Range | TJ | -55 | | 175 | °C | | 1 |
| Storage Temperature Range | Ts | -55 | | 175 | °C | | 1 |
| Nominal Zener Voltage | VZ | | 5.1 | | V | @ IZT = 147 mA | 2 |
| Zener Test Current | IZT | | 147 | | mA | | 2 |
## CAD (KiCad official)
- Symbol: `1SMB3EZ5.1`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)
- 3D model files: `1smb3ez5-1-etched.step` / `1smb3ez5-1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1smb3ez5-1.step` / `1smb3ez5-1.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [SUNMATE Elec datasheet](docs/1smb3ez5-1-datasheet.pdf) (3 pp, sha256 `c7ffa07f96057398`, retrieved 2026-10-22, tier: lcsc)
- **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/1smb3ez5-1-datasheet.pdf)