# MM1Z5236B

**ST Semtech** · Zener Diodes · SOD-123

MM1Z5236B from ST Semtech, in a SOD-123. 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 | Cathode | passive | Cathode terminal of the silicon planar Zener diode, shown as pin 1 in the SOD-123 PINNING table and outline drawing. |
| 2 | Anode | passive | Anode terminal of the silicon planar Zener diode, shown as pin 2 in the SOD-123 top view and PINNING table. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ST Semtech |
| Package | SOD-123 |
| 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 (VZT, pulsed) | VZT | 7.13 |  | 7.88 | V | at IZT = 20 mA, pulsed 20 ms | 2 |
| Nominal zener voltage | Vznom |  | 7.5 |  | V |  | 2 |
| Dynamic impedance (zener test current) | ZZT |  |  | 6 | Ω | at IZT = 20 mA | 2 |
| Dynamic impedance (knee current) | ZZK |  |  | 500 | Ω | at IZK = 0.25 mA | 2 |
| Reverse current | IR |  |  | 3 | µA | at VR = 6 V | 2 |
| Forward voltage | VF |  |  | 0.9 | V | at IF = 10 mA | 1 |
| Zener voltage tolerance |  | -5 |  | 5 | % | approximately ±5% (family tolerance per Features) | 1 |
| Power dissipation (total) | Ptot |  |  | 500 | mW | Ta = 25℃ | 1 |
| Junction temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage temperature range | TStg | -55 |  | 150 | ℃ |  | 1 |
| Thermal resistance junction to ambient air | RθJA |  |  | 350 | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `MM1Z5236B`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `mm1z5236b-etched.step` / `mm1z5236b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mm1z5236b.step` / `mm1z5236b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ST Semtech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586185925461725184) (4 pp, sha256 `a80b873003c5c24a`, retrieved 2026-10-20, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/mm1z5236b-datasheet.pdf)