# SZMM3Z20VT1GX

**Nexperia** · Zener Diodes · SOD-323

SZMM3Z20VT1GX from Nexperia, in a SOD-323. 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; the marking bar on the package indicates the cathode. |
| 2 | A | passive | Anode of the Zener diode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOD-323 |
| 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 |
|---|---|---|---|---|---|---|---|
| Working voltage (min) | VZ | 18.86 |  |  | V | IZ = 5 mA (Table 8 column header); Tj = 25 °C unless otherwise specified | 4 |
| Working voltage (max) | VZ |  |  | 21.08 | V | IZ = 5 mA (Table 8 column header); Tj = 25 °C unless otherwise specified | 4 |
| Tolerance series |  | -5 |  | 5 | % | Printed as 'Approximately ± 5 %' (Features and benefits) | 1 |
| Total power dissipation | Ptot |  |  | 300 | mW | Tamb = 25 °C; device mounted on FR4 PCB, single-sided copper, standard footprint | 3 |
| Non-repetitive peak reverse power dissipation | PZSM |  |  | 40 | W | tp = 100 µs; square wave; Tamb = 25 °C; prior to surge | 3 |
| Differential resistance | rdiff |  |  | 0.05 | Ω | IZ = 5 mA (Table 8 column header) | 4 |
| Temperature coefficient (min) | SZ | 14.4 |  |  | mV/K | IZ = 5 mA (Table 8 column header) | 4 |
| Temperature coefficient (max) | SZ |  |  | 18 | mV/K | IZ = 5 mA (Table 8 column header) | 4 |
| Reverse current | IR |  |  | 100 | µA | IZ = 0.5 mA; VR = 15.0 V | 4 |
| Reverse current | IR |  |  | 20 | µA | IZ = 5 mA; VR = 15.0 V | 4 |
| Diode capacitance | Cd |  |  | 88 | pF | f = 1 MHz; VR = 0 V | 4 |
| Forward voltage | VF |  |  | 0.9 | V | IF = 10 mA; pulse test tp ≤ 300 µs; δ ≤ 0.02 | 3 |
| Forward voltage | VF |  |  | 1.1 | V | IF = 100 mA; pulse test tp ≤ 300 µs; δ ≤ 0.02 | 3 |
| Forward current | IF |  |  | 200 | mA |  | 3 |
| Junction temperature | Tj |  |  | 150 | °C |  | 3 |
| Ambient temperature | Tamb | -55 |  | 150 | °C |  | 3 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 3 |
| Thermal resistance junction to ambient | Rth(j-a) |  |  | 415 | K/W | in free air; device mounted on FR4 PCB, single-sided copper, standard footprint | 3 |
| Thermal resistance junction to solder point | Rth(j-sp) |  |  | 110 | K/W | soldering point of cathode tab | 3 |
| Nominal working voltage | VZ |  | 20 |  | V | Nominal voltage of SZMM3Z20VT1G (type designation 20V) | 2 |

## CAD (KiCad official)

- Symbol: `SZMM3Z20VT1GX`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `szmm3z20vt1gx-etched.step` / `szmm3z20vt1gx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `szmm3z20vt1gx.step` / `szmm3z20vt1gx.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Nexperia datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590469082035761152) (12 pp, sha256 `97ec17023363288c`, retrieved 2026-10-23, 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/szmm3z20vt1gx-datasheet.pdf)