# 04661.75NRHF

**Littelfuse** · Disposable Fuses · 1206

04661.75NRHF from Littelfuse, in a 1206. 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 tin-plated end termination of the non-polarized 0.75 A fast-acting fuse (rated 63 V, 50 A interrupting at 63 V AC/DC); interchangeable with the other terminal. |
| 2 | 2 | passive | Other tin-plated end termination of the non-polarized 0.75 A fast-acting fuse (rated 63 V, 50 A interrupting at 63 V AC/DC); interchangeable with the other terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | 1206 |
| 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 |
|---|---|---|---|---|---|---|---|
| Opening time at 100% of ampere rating |  | 4 |  |  | hours | 25°C | 1 |
| Opening time at 200% of ampere rating |  |  |  | 5 | sec | 25°C | 1 |
| Opening time at 300% of ampere rating |  |  |  | 0.2 | sec | 25°C | 1 |
| Insulation resistance (after opening) |  | 10000 |  |  | ohms | After opening | 3 |
| Maximum voltage rating |  |  |  | 63 | V |  | 1 |
| Interrupting rating |  |  |  | 50 | A | @63 V AC/DC, measured at rated voltage | 1 |
| Ampere rating |  |  | 1.75 |  | A |  | 1 |
| Nominal cold resistance |  |  | 0.038 |  | Ohms | Measured at 10% of rated current, 25ºC (electrical specification note 1) | 1 |
| Nominal melting I2t |  |  | 0.1835 |  | A2sec |  | 1 |
| Nominal voltage drop |  |  | 80.73 |  | mV |  | 1 |
| Nominal power dissipation |  |  | 0.1413 |  | W |  | 1 |
| Operating temperature |  | -55 |  | 90 | °C | Consult temperature re-rating curve; 25% standard re-rating applies for continuous operation | 3 |
| Peak reflow temperature (Pb-free) | TP |  |  | 260 | °C | Pb-free reflow; do not exceed 260°C; tolerance +0/-5 °C | 2 |
| Wave solder temperature |  |  |  | 260 | °C | Wave soldering, 10 seconds max. | 2 |

## CAD (KiCad official)

- Symbol: `04661.75NRHF`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `04661-75nrhf-etched.step` / `04661-75nrhf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `04661-75nrhf.step` / `04661-75nrhf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Littelfuse datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588903736684634112) (3 pp, sha256 `59e7ee52ef17c1fe`, retrieved 2026-10-19, 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/04661-75nrhf-datasheet.pdf)