# SMBJ5348B

**Slkor(SLKORMICRO Elec.)** · Zener Diodes · SMB

SMBJ5348B from Slkor(SLKORMICRO 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, marked by the color band on the package; the 5 W zener (SMBJ5348B, VZ 11 V at IZT 125 mA) is reverse biased with this pin positive. |
| 2 | A | passive | Anode, the unmarked end of the package; forward voltage is 1.2 V max at IF=1.0 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Slkor(SLKORMICRO 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 voltage tolerance (B suffix) | VZ | -5 |  | 5 | % | suffix B selected type, @IZT | 3 |
| Maximum zener impedance | ZZT |  |  | 2.5 | Ω | @IZT | 2 |
| Maximum zener impedance (knee) | ZZK |  |  | 125 | Ω | @IZK = 1 mA | 2 |
| Maximum reverse leakage current | IR |  |  | 5 | μA | @VR = 8 V | 2 |
| Maximum DC zener current | IZM |  |  | 430 | mA | @50℃ | 2 |
| Forward voltage | VF |  |  | 1.2 | V | IF=1.0A | 1 |
| Power dissipation | Pt |  |  | 5 | W | TL=75℃ | 1 |
| Thermal resistance, junction to ambient | Rθ(ja) |  | 20 |  | ℃/W | mounted on 5×5mm copper pad at lead ends | 1 |
| Operating and storage temperature range | TJ,TSTG | -55 |  | 150 | ℃ |  | 1 |
| Nominal zener voltage | VZ |  | 11 |  | V | @IZT | 2 |
| Zener test current | IZT |  | 125 |  | mA |  | 2 |

## CAD (KiCad official)

- Symbol: `SMBJ5348B`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)
- 3D model files: `smbj5348b-etched.step` / `smbj5348b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smbj5348b.step` / `smbj5348b.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Slkor(SLKORMICRO Elec.) datasheet](docs/smbj5348b-datasheet.pdf) (5 pp, sha256 `42869e8f1e6e687c`, retrieved 2026-10-23, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/smbj5348b-datasheet.pdf)