# PRG21BC6R8MM1RA

**Murata Electronics** · Resettable Fuses · 0805

PRG21BC6R8MM1RA from Murata Electronics, in a 0805. 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 | One Sn-plated terminal electrode on the BaTiO3 semiconductive ceramic PTC body, rated for this 6.8 ohm MPN at a maximum voltage of DC30V and a maximum current of 5.5A. |
| 2 | 2 | passive | The opposite Sn-plated terminal electrode on the BaTiO3 semiconductive ceramic PTC body, which is non-polar and is used as the second connection of the posistor; the datasheet states the same 30V/5.5A limits for the part. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Murata Electronics |
| Package | 0805 |
| 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 |
|---|---|---|---|---|---|---|---|
| Resistance tolerance |  | -20 |  | 20 | % | Printed ±20% for PRG21BC6R8MM1RA (tolerance code M in part number) | 1 |
| Max. Voltage |  |  |  | 30 | V | Footnote *1 as printed: shall be passed repeatedly when the circuit runs abnormally | 1 |
| Max. Current |  |  |  | 5.5 | A | Footnote *2 as printed: passed continuously without tripping at 25°C, 60°C and 85°C | 1 |
| Resistance at 25°C | R25 |  | 6.8 |  | ohm | At 25°C | 1 |
| Hold Current |  |  | 120 |  | mA | At +25°C | 1 |
| Hold Current |  |  | 80 |  | mA | At +60°C | 1 |
| Hold Current |  |  | 50 |  | mA | At +85°C | 1 |
| Trip Current |  |  | 335 |  | mA | At -20°C | 1 |
| Trip Current |  |  | 320 |  | mA | At -10°C | 1 |
| Trip Current |  |  | 260 |  | mA | At +25°C | 1 |
| Thermal dissipation coefficient of mounting state (rating basis) |  |  | 10 |  | mW/°C | Ratings are valid when the thermal dissipation coefficient of the mounting state is 10 mW/°C; other values may give different ratings | 1 |

## CAD (KiCad official)

- Symbol: `PRG21BC6R8MM1RA`
- Footprint: `Fuse:Fuse_0805_2012Metric`
- 3D model: 0805 (KiCad packages3D, STEP)
- 3D model files: `prg21bc6r8mm1ra-etched.step` / `prg21bc6r8mm1ra-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `prg21bc6r8mm1ra.step` / `prg21bc6r8mm1ra.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Murata Electronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590912163081109504) (7 pp, sha256 `3788dd6dd5891b67`, retrieved 2026-10-17, 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/prg21bc6r8mm1ra-datasheet.pdf)