# 1206TD-20AS

**prosemi** · Disposable Fuses · 1206

1206TD-20AS 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 | First end-cap terminal of the 20 A time-delay chip fuse (1206TD-20AS), typical cold resistance 0.0022 ohm, non-polarized and interchangeable with pin 2. |
| 2 | 2 | passive | Second end-cap terminal of the 20 A time-delay chip fuse (1206TD-20AS), typical cold resistance 0.0022 ohm, non-polarized and interchangeable with pin 1. |

## 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 |
|---|---|---|---|---|---|---|---|
| Opening time at 1.0In (6A~40A band) |  | 4 |  |  | hour | Rated current 6A~40A band, at 1.0In; printed as '4 hour min.' | 1 |
| Opening time at 3.5In (6A~40A band) |  |  |  | 5 | s | Rated current 6A~40A band, at 3.5In; printed as '5 sec max.' | 1 |
| Opening time at 10In (6A~40A band) |  | 0.2 |  | 20 | ms | Rated current 6A~40A band, at 10In; printed as '0.2ms, 20ms' | 1 |
| Operating temperature |  | -55 |  | 150 | ℃ | With proper correction factor applied | 2 |
| Ampere rating | In |  | 20 |  | A | Rated current for 1206TD-20AS | 1 |
| Typical cold resistance |  |  | 0.0022 |  | Ohms | Measured at <10% of rated current in ambient temperature of 25℃ | 1 |
| Typical melting I2t | I2t |  | 50 |  | A2Sec | Measured at 10In current | 1 |
| Typical voltage drop |  |  | 0.08 |  | V |  | 1 |

## CAD (KiCad official)

- Symbol: `1206TD-20AS`
- Footprint: `Fuse:Fuse_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `1206td-20as-etched.step` / `1206td-20as-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1206td-20as.step` / `1206td-20as.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/8590182805406842880) (3 pp, sha256 `67b0c0e704a0a3d2`, retrieved 2026-10-17, 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-20as-datasheet.pdf)