# 1206TD-20A

**prosemi** · Disposable Fuses · 1206

1206TD-20A from prosemi, 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 terminal of the non-polarized 1206TD-20A chip fuse, 20.0 A rating, typical cold resistance 0.0027 ohm, typical voltage drop 0.089 V at rated current. |
| 2 | 2 | passive | Second terminal of the non-polarized 1206TD-20A chip fuse, in series with pin 1, operating temperature -55 to 125°C, one-time positive disconnect. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | prosemi |
| 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 |
|---|---|---|---|---|---|---|---|
| Ampere Rating | In |  | 20 |  | A | Part 1206TD-20A rated current | 1 |
| Typical Cold Resistance |  |  | 0.0027 |  | Ohms | Measured at <10% of rated current, 25°C ambient | 1 |
| Typical Melting I2t | I2t |  | 52 |  | A Sec | Measured at 10In current | 1 |
| Typical Voltage Drop | VF |  | 0.089 |  | V | Measured at rated current after temperature has stabilized | 1 |
| Opening time at 100% of amp rating |  | 4 |  |  | hours | 0.75~30A, 100% of Amp Rating | 1 |
| Opening time at 350% of amp rating |  |  |  | 5 | s | 6~30A, 350% of Amp Rating | 1 |
| Opening time at 1000% of amp rating |  | 0.2 |  | 20 | ms | 0.75~30A, 1000% of Amp Rating | 1 |
| Operating temperature |  | -55 |  | 125 | °C | Operating Temperature | 2 |
| Preheat temperature window (Tsmin to Tsmax) | Ts | 150 |  | 200 | °C | IR reflow profile, preheat | 2 |
| Preheat time (Tsmin to Tsmax) | ts | 60 |  | 120 | s | IR reflow profile, preheat | 2 |
| Average ramp-up rate (Tsmax to Tp) |  |  |  | 3 | °C/s | IR reflow profile | 2 |
| Liquidous temperature | TL |  | 217 |  | °C | IR reflow profile | 2 |
| Time at liquidous | tL | 60 |  | 150 | s | IR reflow profile | 2 |
| Peak temperature | Tp |  | 260 |  | °C | IR reflow profile, +0/-5°C | 2 |
| Time within 5°C of actual peak temperature | tp | 10 |  | 30 | s | IR reflow profile | 2 |
| Average ramp-down rate (Tp to Tsmax) |  |  |  | 6 | °C/s | IR reflow profile | 2 |
| Time 25°C to peak temperature |  |  |  | 8 | min | IR reflow profile | 2 |
| Wave soldering time |  |  |  | 10 | s | Wave soldering at 260°C | 2 |
| Infrared reflow time |  |  |  | 30 | s | Infrared reflow at 260°C | 2 |

## CAD (KiCad official)

- Symbol: `1206TD-20A`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `1206td-20a-etched.step` / `1206td-20a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1206td-20a.step` / `1206td-20a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [prosemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590182934243549184) (3 pp, sha256 `040c3168e91fc117`, 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/1206td-20a-datasheet.pdf)