# C2Q 300

**Bel Fuse** · Disposable Fuses · 0603

C2Q 300 from Bel Fuse, in a 0603. 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 | Fuse terminal 1 (Ag/Ni/Sn termination) of the 300mA, 0603 very fast-acting chip fuse; the fuse is non-polarized and rated 32V AC / 63V DC. |
| 2 | 2 | passive | Fuse terminal 2 (Ag/Ni/Sn termination) of the 300mA, 0603 very fast-acting chip fuse; the fuse is non-polarized and interchangeable with terminal 1, with 35A interrupting rating at 32V AC and 50A at 63V DC. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Bel Fuse |
| Package | 0603 |
| 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 |
|---|---|---|---|---|---|---|---|
| Blow time at 200% of rated current, maximum |  |  |  | 5 | sec | Testing current 200% of In | 1 |
| Blow time at 300% of rated current, maximum |  |  |  | 0.2 | sec | Testing current 300% of In | 1 |
| Blow time at 100% of rated current, minimum |  | 4 |  |  | Hrs | Testing current 100% of In | 1 |
| Voltage rating, AC |  |  |  | 32 | V AC | Ampere range 250mA-4A (applies to C2Q 300) | 1 |
| Voltage rating, DC |  |  |  | 63 | V DC | Ampere range 250mA-4A (applies to C2Q 300) | 1 |
| Interrupting rating (short circuit), AC |  |  |  | 35 | A | @ 32V AC, ampere range 250mA-4A | 1 |
| Interrupting rating (short circuit), DC |  |  |  | 50 | A | @ 63V DC, ampere range 250mA-4A | 1 |
| Insulation resistance after opening |  | 10000 |  |  | ohms | After opening, MIL-STD-202G Method 302, Test Condition A | 3 |
| Operating temperature |  | -55 |  | 125 | ℃ |  | 3 |
| IR reflow peak temperature | Tp |  |  | 260 | ℃ | Lead-free IR reflow, IPC/JEDEC J-STD-020D | 3 |
| Ampere rating |  |  | 300 |  | mA | Catalog C2Q 300 | 2 |
| Nominal cold resistance |  |  | 0.54 |  | ohms | Nominal cold resistance | 2 |
| Nominal volt-drop |  |  | 0.217 |  | V | @100% In | 2 |
| Nominal melting I²T |  |  | 3e-05 |  | A² Sec | @10 In | 2 |
| Nominal power dissipation |  |  | 0.07 |  | W | @100% In | 2 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | Terminations : Ag / Ni / Sn (100% Lead-free) Element Cover Coating : Lead-free Glass | 1 |

## CAD (KiCad official)

- Symbol: `C2Q 300`
- Footprint: `Fuse:Fuse_0603_1608Metric`
- 3D model: 0603 (KiCad packages3D, STEP)
- 3D model files: `c2q-300-etched.step` / `c2q-300-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `c2q-300.step` / `c2q-300.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Bel Fuse datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603010904389283840) (4 pp, sha256 `3f6e9730715cb576`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/c2q-300-datasheet.pdf)