# PTZ20B-MS

**MSKSEMI** · Zener Diodes · SMA

PTZ20B-MS from MSKSEMI, in a SMA. 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; for PTZ20B-MS the Zener voltage is 20.0 V min to 22.4 V max at IZT = 20 mA. |
| 2 | A | passive | Anode, the end opposite the color band; maximum power dissipation is 1.0 W at 25 °C ambient. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | SMA |
| 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 | VZ | 20 | 20.82 | 22.4 | V | IZT = 20 mA, Ta = 25 °C | 3 |
| Maximum Zener Impedance | ZZ |  |  | 14 | Ω | IZ = 20 mA | 3 |
| Maximum Reverse Current | IR |  |  | 10 | μA | VR = 15.0 V | 3 |
| Typical Temperature Coefficient |  |  | 17.4 |  | mV/ºC | IZ = 20 mA | 3 |
| Power Dissipation | PD |  |  | 1 | W | Rating at 25 °C ambient temperature | 2 |
| Junction Temperature | TJ |  |  | 150 | ºC |  | 2 |
| Storage Temperature Range | TSTG | -55 |  | 150 | ºC |  | 2 |
| Zener Test Current | IZT |  | 20 |  | mA | Test current for VZ | 3 |

## CAD (KiCad official)

- Symbol: `PTZ20B-MS`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `ptz20b-ms-etched.step` / `ptz20b-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ptz20b-ms.step` / `ptz20b-ms.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](docs/ptz20b-ms-datasheet.pdf) (5 pp, sha256 `b667407134cededf`, retrieved 2026-10-22, tier: lcsc)
- **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/ptz20b-ms-datasheet.pdf)