component
SMB3Z39A
Public Made by Adomby adom
XCH(旭昌辉) , SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSMB3Z39A
XCH(旭昌辉) · IC · SMB
SMB3Z39A 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; it goes positive relative to the anode in Zener (reverse) operation, with VZ of 39 V nominal (37.05 to 40.95 V) for SMB3Z39A. |
| 2 | A | passive | Anode, the terminal opposite the color-band end; the device is rated 3.0 W DC power dissipation at TL = 75 °C and VF max 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 (nominal, average) | VZ | 37.05 | 39 | 40.95 | V | @IZT | 3 |
| Maximum Zener impedance (ZZT) | ZZT | 28 | Ω | @IZT | 3 | ||
| Maximum Zener impedance (ZZK) | ZZK | 1000 | Ω | @IZK | 3 | ||
| Maximum reverse leakage current | IR | 0.5 | uA | @VR, VR = 29.7 V | 3 | ||
| Maximum DC Zener current | IZM | 69 | mA | 3 | |||
| Maximum forward voltage | VF | 1.2 | V | at IF = 200mA | 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:
SMB3Z39A - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
smb3z39a-etched.step/smb3z39a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smb3z39a.step/smb3z39a.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).