# MMBZ5235B

**Changjing** · Zener Diodes · SOT-23

MMBZ5235B from Changjing, 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 | Zener diode anode; the symbol on page 1 shows pin 1 on the anode side of the diode, which has a 6.8V nominal Zener voltage (6.46V to 7.14V) at IZT = 20mA. |
| 2 | NC | unconnected | Not connected; the page 1 symbol shows pin 2 as an isolated terminal with no connection to the diode. |
| 3 | K | passive | Zener diode cathode; the symbol on page 1 shows pin 3 on the bar side of the diode, with a power dissipation limit of 300mW. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| 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 | 6.46 | 6.8 | 7.14 | V | IZT = 20 mA; short test pulse (Note 1) | 2 |
| Maximum Zener impedance | ZZT |  |  | 5 | Ω | @ IZT = 20 mA; f = 1 kHz (Note 2) | 2 |
| Maximum Zener impedance (knee) | ZZK |  |  | 750 | Ω | @ IZK = 0.25 mA | 2 |
| Maximum reverse leakage current | IR |  |  | 3 | µA | @ VR = 5.0 V | 2 |
| Forward voltage | VF |  |  | 0.9 | V | @ IF = 10 mA | 1 |
| Power dissipation | PD |  |  | 300 | mW |  | 1 |
| Thermal resistance, junction to ambient | RθJA |  |  | 417 | ℃/W | Junction to ambient | 1 |
| Operation junction and storage temperature range | TJ,TSTG | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `MMBZ5235B`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmbz5235b-etched.step` / `mmbz5235b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbz5235b.step` / `mmbz5235b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603030408636887040) (5 pp, sha256 `eab0dbad2cbe9e7d`, retrieved 2026-10-19, 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/mmbz5235b-datasheet.pdf)