# MMBZ5237BS-7-F

**Diodes Incorporated** · Zener Diodes · SOT-363

MMBZ5237BS-7-F from Diodes Incorporated, in a SOT-363. 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 | A1 | passive | Anode of Zener diode 1 (dual isolated 200mW Zener, VZ nominal 8.2V at IZT = 20mA for MMBZ5237BS). |
| 2 | NC | unconnected | No connect pin, not internally connected to either Zener diode. |
| 3 | C2 | passive | Cathode of Zener diode 2 (dual isolated 200mW Zener, VZ nominal 8.2V at IZT = 20mA for MMBZ5237BS). |
| 4 | A2 | passive | Anode of Zener diode 2 (dual isolated 200mW Zener, VZ nominal 8.2V at IZT = 20mA for MMBZ5237BS). |
| 5 | NC | unconnected | No connect pin, not internally connected to either Zener diode. |
| 6 | C1 | passive | Cathode of Zener diode 1 (dual isolated 200mW Zener, VZ nominal 8.2V at IZT = 20mA for MMBZ5237BS). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-363 |
| Category | Diodes |
| Pins | 6 |

## 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 (nominal 8.2 V) | VZ | 7.79 | 8.2 | 8.61 | V | @ IZT = 20 mA; short pulse test (Note 5) | 2 |
| Maximum Zener impedance | ZZT |  |  | 8 | Ω | @ IZT = 20 mA, f = 1 kHz (Note 6) | 2 |
| Maximum Zener impedance at knee | ZZK |  |  | 500 | Ω | @ IZK = 0.25 mA | 2 |
| Maximum reverse leakage current | IR |  |  | 3 | μA | @ VR = 6.5 V | 2 |
| Power dissipation | PD |  |  | 200 | mW | Mounted on FR4 PC board with recommended pad layout (Note 1) | 1 |
| Forward voltage | VF |  |  | 0.9 | V | @ IF = 10 mA | 1 |
| Operating and storage temperature range | TJ, TSTG | -65 |  | 150 | °C |  | 1 |
| Thermal resistance, junction to ambient air | RθJA |  | 625 |  | °C/W | Mounted on FR4 PC board with recommended pad layout (Note 1) | 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 |  | tin | • Terminals: Solderable per MIL-STD-202, Method 208 • Lead Free Plating (Matte Tin Finish annealed over Alloy 42 | 1 |

## CAD (KiCad official)

- Symbol: `MMBZ5237BS-7-F`
- Footprint: `Package_TO_SOT_SMD:SOT-363_SC-70-6`
- 3D model: SOT-363 (KiCad packages3D, STEP)
- 3D model files: `mmbz5237bs-7-f-etched.step` / `mmbz5237bs-7-f-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbz5237bs-7-f.step` / `mmbz5237bs-7-f.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Diodes Incorporated datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8560094961862533120) (4 pp, sha256 `b594a591fc6c585d`, 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/mmbz5237bs-7-f-datasheet.pdf)