component
SMB5349A
Public Made by Adomby adom
XCH(旭昌辉) , SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
| Name | Last updated |
|---|---|
| docs | 3d ago |
| viewers | 3d ago |
| package.json | 3d ago |
| page.json | 3d ago |
| README.md | 3d ago |
| smb5349a-etched.glb | 3d ago |
| smb5349a-etched.step | 3d ago |
| smb5349a-hero.glb | 3d ago |
| smb5349a-hero.overlay.json | 3d ago |
| smb5349a.glb | 3d ago |
| smb5349a.kicad_mod | 3d ago |
| smb5349a.kicad_sym | 3d ago |
| smb5349a.lbr | 3d ago |
| smb5349a.step | 3d ago |
SMB5349A
XCH(旭昌辉) · IC · SMB
SMB5349A 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 in zener (reverse) operation, and this part has a nominal 12.0 V zener voltage (11.40 to 12.60 V). |
| 2 | A | passive | Anode, the end opposite the color band; it is the forward-conduction terminal, with 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 (nominal, typ = VZ AVE) | VZ | 11.4 | 12 | 12.6 | V | 3 | |
| Zener voltage tolerance (A suffix) | -5 | 5 | % | Standard tolerance on nominal zener voltage, per remark | 3 | ||
| Maximum zener impedance | ZZT | 100 | Ω | @IZT 2.5 mA | 3 | ||
| Maximum zener impedance (knee) | ZZK | 125 | Ω | @IZK 1.00 mA | 3 | ||
| Maximum reverse leakage current | IR | 2 | μA | @VR 9.1 V | 3 | ||
| Maximum DC zener current | IZM | 395 | mA | 3 | |||
| DC power dissipation | PD | 5 | W | TL = 75 °C | 1 | ||
| Maximum forward voltage | VF | 1.2 | V | if=200mA | 1 | ||
| Junction temperature range | TJ | -55 | 150 | ℃ | 1 | ||
| Storage temperature range | TSTG | -55 | 150 | ℃ | 1 | ||
| Typical thermal resistance, junction to ambient | RθJA | 65 | ℃/W | Junction to ambient, mounted on 0.3" x 0.3" (8.0 mm x 8.0 mm) copper pad areas | 1 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper | （2）Thermal resistance from junction to ambient and from junction to lead mounted on P. 0.3" x 0.3" (8.0 mm x 8.0 mm) copper pad areas. | 1 |
CAD (KiCad official)
- Symbol:
SMB5349A - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
smb5349a-etched.step/smb5349a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smb5349a.step/smb5349a.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
cc44843246128500, retrieved 2026-10-20, 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).