# MA3075WALT1G

**onsemi** · ESD Protection Devices · SOT-23

MA3075WALT1G from onsemi, 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 | CATHODE | passive | Cathode of the first of the two unidirectional zener junctions; the dual common-anode design protects two separate lines in one package. |
| 2 | CATHODE | passive | Cathode of the second of the two unidirectional zener junctions; the dual common-anode design protects two separate lines in one package. |
| 3 | ANODE | passive | Common anode shared by both zener junctions, which provides transient overvoltage and ESD protection for two lines. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOT-23 |
| Category | Circuit Protection |
| 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 | 7.2 | 7.5 | 7.9 | V | IZ = 5 mA | 2 |
| Temperature Coefficient of Zener Voltage | SZ | 2.5 | 4 | 5.3 | mV/°C | IZ = 5 mA | 2 |
| Operating Resistance | RZK |  |  | 120 | Ω | IZ = 0.5 mA | 2 |
| Operating Resistance | RZ |  | 6 | 15 | Ω | IZ = 5 mA | 2 |
| Reverse Current | IR1 |  |  | 1 | µA | VR = 5 V | 2 |
| Reverse Current | IR2 |  |  | 60 | µA | VR = 6.5 V | 2 |
| Forward Voltage | VF |  | 0.8 | 0.9 | V | IF = 10 mA | 2 |
| Terminal Capacitance | Ct |  | 80 |  | pF | VR = 0 V | 2 |
| Peak Power Dissipation | Ppk |  |  | 15 | W | @ 100 µs, non-repetitive (Note 1) | 1 |
| Steady State Power Dissipation | PD |  |  | 225 | mW | Mounted on FR-5 board (Note 2); derate 1.8 mW/°C above 25°C | 1 |
| Thermal Resistance, Junction-to-Ambient | RθJA |  |  | 556 | °C/W |  | 1 |
| Operating Junction and Storage Temperature Range | TJ, Tstg | -55 |  | 150 | °C |  | 1 |
| ESD Discharge, Human Body Model | VPP |  |  | 16 | kV | MIL STD 883C Method 3015-6 | 1 |
| ESD Discharge, Air Discharge | VPP |  |  | 30 | kV | IEC61000-4-2, Air Discharge | 1 |
| ESD Discharge, Contact Discharge | VPP |  |  | 30 | kV | IEC61000-4-2, Contact Discharge | 1 |

## CAD (KiCad official)

- Symbol: `MA3075WALT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ma3075walt1g-etched.step` / `ma3075walt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ma3075walt1g.step` / `ma3075walt1g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/ma3075walt1-d.pdf) (6 pp, sha256 `d8d89188efed525f`, retrieved 2026-11-04, tier: manufacturer)
- **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/ma3075walt1g-datasheet.pdf)