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SMB3Z19A
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XCH(旭昌辉) , SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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SMB3Z19A
XCH(旭昌辉) · IC · SMB
SMB3Z19A from XCH(旭昌辉), 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 end marked by the color band; the datasheet gives a Zener voltage of 19.0 V (18.05 V min to 19.95 V max) for the SMB3Z19A. |
| 2 | A | passive | Anode, the end opposite the color band; the datasheet gives a maximum forward voltage of 1.2 V at 200 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | XCH(旭昌辉) |
| Package | SMB |
| Category | |
| 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 MIN / AVE / MAX) | VZ | 18.05 | 19 | 19.95 | V | @IZT 7.0 mA | 3 |
| Zener impedance (ZZT MAX) | ZZT | 40 | Ω | @IZT 7.0 mA | 3 | ||
| Zener impedance (ZZK MAX) | ZZK | 750 | Ω | @IZK 0.25 mA | 3 | ||
| Reverse leakage current (IR MAX) | IR | 0.5 | uA | @VR 14.4 V | 3 | ||
| Maximum DC zener current (IZM) | IZM | 142 | mA | 3 | |||
| Maximum forward voltage | VF | 1.2 | V | at IF = 200 mA | 1 | ||
| DC power dissipation | PD | 3 | W | at TL = 75 °C (note 1) | 1 | ||
| Junction temperature range | TJ | -55 | 150 | ℃ | 1 | ||
| Storage temperature range | TSTG | -55 | 150 | ℃ | 1 |
CAD (KiCad official)
- Symbol:
SMB3Z19A - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
smb3z19a-etched.step/smb3z19a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smb3z19a.step/smb3z19a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: XCH(旭昌辉) datasheet (3 pp, sha256
f7084c044e53fbe6, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).
# SMB3Z19A
**XCH(旭昌辉)** · IC · SMB
SMB3Z19A from XCH(旭昌辉), 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 end marked by the color band; the datasheet gives a Zener voltage of 19.0 V (18.05 V min to 19.95 V max) for the SMB3Z19A. |
| 2 | A | passive | Anode, the end opposite the color band; the datasheet gives a maximum forward voltage of 1.2 V at 200 mA. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | XCH(旭昌辉) |
| Package | SMB |
| Category | |
| 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 MIN / AVE / MAX) | VZ | 18.05 | 19 | 19.95 | V | @IZT 7.0 mA | 3 |
| Zener impedance (ZZT MAX) | ZZT | | | 40 | Ω | @IZT 7.0 mA | 3 |
| Zener impedance (ZZK MAX) | ZZK | | | 750 | Ω | @IZK 0.25 mA | 3 |
| Reverse leakage current (IR MAX) | IR | | | 0.5 | uA | @VR 14.4 V | 3 |
| Maximum DC zener current (IZM) | IZM | | | 142 | mA | | 3 |
| Maximum forward voltage | VF | | | 1.2 | V | at IF = 200 mA | 1 |
| DC power dissipation | PD | | | 3 | W | at TL = 75 °C (note 1) | 1 |
| Junction temperature range | TJ | -55 | | 150 | ℃ | | 1 |
| Storage temperature range | TSTG | -55 | | 150 | ℃ | | 1 |
## CAD (KiCad official)
- Symbol: `SMB3Z19A`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)
- 3D model files: `smb3z19a-etched.step` / `smb3z19a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smb3z19a.step` / `smb3z19a.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [XCH(旭昌辉) datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603010741012213760) (3 pp, sha256 `f7084c044e53fbe6`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/smb3z19a-datasheet.pdf)