component
SMB5351A
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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Contents
README
markdownSMB5351A
XCH(旭昌辉) · IC · SMB
SMB5351A 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 is positive relative to the anode in zener operation, with VZ 14.0 V nominal (13.30 to 14.70 V) for the SMB5351A. |
| 2 | A | passive | Anode, the end opposite the color band; forward voltage is at most 1.2 V at IF=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 |
|---|---|---|---|---|---|---|---|
| Nominal zener voltage | VZ | 13.3 | 14 | 14.7 | V | 3 | |
| Zener voltage tolerance (suffix A) | VZ | -5 | 5 | % | standard tolerance on nominal zener voltage | 3 | |
| Maximum zener impedance | ZZT | 100 | Ω | @IZT = 2.5 mA | 3 | ||
| Maximum zener impedance | ZZK | 75 | Ω | @IZK = 1.00 mA | 3 | ||
| Maximum reverse leakage current | IR | 1 | µA | @VR = 10.6 V | 3 | ||
| Maximum DC zener current | IZM | 340 | mA | 3 | |||
| Maximum forward voltage | VF | 1.2 | V | if=200mA | 1 | ||
| DC power dissipation | PD | 5 | W | TL = 75 °C (note 1) | 1 | ||
| Junction temperature range | TJ，TSTG | -55 | 150 | ℃ | 1 | ||
| Storage temperature range | TJ，TSTG | -55 | 150 | ℃ | 1 | ||
| Typical thermal resistance, junction to ambient | RθJA | 65 | ℃/W | junction to ambient, mounted on 0.3 in x 0.3 in copper pads (note 2) | 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:
SMB5351A - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
smb5351a-etched.step/smb5351a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smb5351a.step/smb5351a.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 2026-11-07, 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).