# MMBZ5243B

**Slkor(SLKORMICRO Elec.)** · Zener Diodes · SOT-23

MMBZ5243B from Slkor(SLKORMICRO Elec.), in a SOT-23. 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 | A | passive | Anode of the zener diode, shown as pin 1 in the connection diagram; device is 13V nominal (12.35V to 13.65V at IZT=9.5mA). |
| 2 | NC | unconnected | No connection, marked 2 NC in the connection diagram. |
| 3 | K | passive | Cathode of the zener diode, shown as pin 3 in the connection diagram; maximum reverse leakage 0.5µA at VR=9.9V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Slkor(SLKORMICRO Elec.) |
| Package | SOT-23 |
| Category | Diodes |
| Pins | 3 |

## 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 | 12.35 | 13 | 13.65 | V | @IZT=9.5mA | 2 |
| Zener Test Current | IZT |  | 9.5 |  | mA |  | 2 |
| Maximum Zener Impedance | ZZT |  |  | 13 | Ω | @IZT=9.5mA | 2 |
| Maximum Zener Impedance (knee) | ZZK |  |  | 600 | Ω | @IZK=0.25mA | 2 |
| Maximum Reverse Leakage Current | IR |  |  | 0.5 | μA | VR=9.9V | 2 |
| Reverse Voltage for Leakage | VR |  | 9.9 |  | V |  | 2 |
| Forward Voltage | VF |  |  | 0.9 | V | IF=10mA | 1 |
| Power Dissipation | Pd |  |  | 350 | mW | Ta=25℃ | 1 |
| Thermal Resistance, Junction to Ambient Air | RθjA |  |  | 357 | ℃/W |  | 1 |
| Operating and Storage Temperature Range | Tj, Tstg | -65 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `MMBZ5243B`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmbz5243b-etched.step` / `mmbz5243b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbz5243b.step` / `mmbz5243b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Slkor(SLKORMICRO Elec.) datasheet](docs/mmbz5243b-datasheet.pdf) (4 pp, sha256 `8096af577e1c32df`, retrieved 2026-10-22, 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/mmbz5243b-datasheet.pdf)