# MVR1812-390G

**DOWO** · Varistors · 1812

MVR1812-390G from DOWO, in a 1812. 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 | 1 | passive | Terminal 1 of an unpolarised resistor; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised resistor; either orientation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | DOWO |
| Package | 1812 |
| Category | Circuit Protection |
| 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 |
|---|---|---|---|---|---|---|---|
| Varistor voltage (measured at 1mA DC) | VB | 35 | 39 | 42 | V | Measured at 1mA DC | 1 |
| Maximum allowable continuous DC voltage | VDC |  |  | 30 | V |  | 1 |
| Maximum allowable continuous AC voltage | VRMS |  |  | 24 | V | AC voltage at 50~60Hz | 1 |
| Typical capacitance value tolerance |  | -40 |  | 40 | % | Typical capacitance value tolerance (printed ±40 %) | 1 |
| Typical capacitance value | C |  | 950 |  | pF | Measured at f=1MHz, Vrms=0.5V | 1 |
| Maximum clamping voltage | VC |  |  | 65 | V | Measured at 10A by 8/20µs pulse | 1 |
| Rated peak single pulse transient current | I P |  |  | 500 | A | Measured by 8/20µs pulse | 1 |
| Maximum energy absorption | E |  |  | 5 | J | 10/1000µs | 1 |
| Response time | T rise |  |  | 5 | ns | Printed as <5 ns | 1 |
| Leakage current at VDC (initial state) | IL |  |  | 50 | µA | Leakage current at VDC (At initial state) | 1 |
| Leakage current at VDC (after reliability test) | ILA |  |  | 100 | µA | Leakage current at VDC (After reliability Test) | 1 |
| Operating ambient temperature |  | -40 |  | 125 | ℃ |  | 1 |
| Storage temperature |  | -40 |  | 125 | ℃ |  | 1 |
| Varistor voltage change after high temperature storage |  | -10 |  | 10 | % | 125℃ for 1000 hours, no load | 3 |
| Varistor voltage change after temperature cycle |  | -10 |  | 10 | % | Five temperature cycles between -40℃ and 125℃ | 3 |
| Varistor voltage change after high temperature load |  | -10 |  | 10 | % | 85℃, 1000 hours, maximum allowable voltage applied | 3 |
| Varistor voltage change after damp heat load |  | -10 |  | 10 | % | 40℃, 90 to 95%RH, 1000 hours, maximum allowable voltage applied | 3 |
| Varistor voltage change after low temperature storage |  | -10 |  | 10 | % | -40℃, no load, 1000 hours | 3 |

## CAD (KiCad official)

- Symbol: `MVR1812-390G`
- Footprint: `Resistor_SMD:R_1812_4532Metric`
- 3D model: 1812 (KiCad packages3D, STEP)
- 3D model files: `mvr1812-390g-etched.step` / `mvr1812-390g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mvr1812-390g.step` / `mvr1812-390g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [DOWO datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590921426340040704) (5 pp, sha256 `9ef29e0dc937565f`, retrieved 2026-10-19, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `two-terminal convention` (convention), consensus `off` (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/mvr1812-390g-datasheet.pdf)