# CI05S120E3

**Tokmas** · SiC Diodes · TO-252

CI05S120E3 from Tokmas, in a TO-252. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | NC | unconnected | No connection. Pin 1 of the TO-252 package is not internally bonded and should be left floating or tied to the cathode plane for mechanical support only. |
| 2 | K | passive | Cathode. Internally connected to the tab (pin 4). Reverse blocking up to VRRM = 1200 V; forward current up to IF = 5 A at TC = 161 °C. |
| 3 | A | passive | Anode. Forward voltage VF ≈ 1.4 V typ at IF = 5 A, TJ = 25 °C. Majority-carrier SiC Schottky junction, so no reverse recovery charge. |
| 4 | K | passive | Cathode / thermal tab. Electrically identical to pin 2; provides the primary heat-dissipation path to the PCB (RθJC = 1.5 °C/W). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Tokmas |
| Package | TO-252 |
| Category | Silicon Carbide (SiC) Devices |
| Pins | 4 |

## Ordering variants

Same part, different packaging or reel option.

- `CI05S120E3`

## CAD (KiCad official)

- Symbol: `CI05S120E3`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252 (KiCad packages3D, STEP)
- 3D model files: `ci05s120e3-etched.step` / `ci05s120e3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ci05s120e3.step` / `ci05s120e3.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Tokmas datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590168719415672832) (5 pp, sha256 `7cf586a44ce51303`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ci05s120e3-datasheet.pdf)