# 0458003.DR

**Littelfuse** · Disposable Fuses · 1206

0458003.DR 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 | Fuse terminal 1 (gold-plated brass end cap, non-polarized); 3 A rating, 75 V max, 50 A @ 75 VDC interrupting rating, nominal cold resistance 0.049 ohm. |
| 2 | 2 | passive | Fuse terminal 2 (gold-plated brass end cap, non-polarized); interchangeable with terminal 1, in series with the protected current path. |

## 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 |
|---|---|---|---|---|---|---|---|
| Insulation resistance (after opening) |  | 10000 |  |  | ohm | after opening; MIL-STD-202 Method 302, Test Condition A | 3 |
| Opening time at 100% of ampere rating |  | 4 |  |  | hours | 100% of ampere rating | 1 |
| Opening time at 250% of ampere rating |  |  |  | 5 | s | 250% of ampere rating | 1 |
| Operating temperature |  | -55 |  | 125 | °C | with proper derating | 3 |
| Max voltage rating |  |  |  | 75 | V |  | 1 |
| Interrupting rating |  |  |  | 50 | A | @ 75VDC (also printed: 50A @ 48VAC) | 1 |
| Peak reflow temperature | TP |  |  | 260 | °C | Pb-free reflow; do not exceed 260°C | 2 |
| Nominal cold resistance |  |  | 0.049 |  | ohm | cold resistance measured at less than 10% of rated current at 25°C | 1 |
| Nominal melting I2t | I2t |  | 2.289 |  | A2sec | stated for 8 msec opening time | 1 |
| Ampere rating |  |  | 3 |  | A |  | 1 |

## CAD (KiCad official)

- Symbol: `0458003.DR`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `0458003-dr-etched.step` / `0458003-dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `0458003-dr.step` / `0458003-dr.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/8588917186027270144) (3 pp, sha256 `4e4a9ebaffcd9cc5`, 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/0458003-dr-datasheet.pdf)