# T491A225K035AT

**KEMET** · Tantalum Capacitors · CASE-A-3216-18(mm)

T491A225K035AT from KEMET, in a CASE-A-3216-18(mm). 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 | + | passive | Anode (+) terminal, marked on the body by a polarity stripe and bevelled edge; it must not be reverse-biased beyond 15% of rated voltage at 25°C, 5% at 85°C and 1% at 125°C (transient only). |
| 2 | - | passive | Cathode (-) terminal at the end opposite the polarity stripe; for the 35 VDC rated T491A225K035AT, the recommended maximum application voltage is 50% of VR from -55°C to 85°C and 33% of VR from 85°C to 125°C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KEMET |
| Package | CASE-A-3216-18(mm) |
| Category | Capacitors |
| Pins | 2 |

## Electrical characteristics

Limits from the LCSC catalog entry for this part (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Capacitance |  |  | 2.2 |  | µF | nominal, catalog attribute (LCSC C122264) | catalog |
| Tolerance |  | -10 |  | 10 | % | catalog attribute (LCSC C122264) | catalog |
| Operating temperature |  | -55 |  | 125 | °C | catalog description (LCSC C122264) | catalog |

## CAD (KiCad official)

- Symbol: `T491A225K035AT`
- Footprint: `Capacitor_Tantalum_SMD:CP_EIA-3216-18_Kemet-A`
- 3D model: CASE-A-3216-18(mm) (KiCad packages3D, STEP)
- 3D model files: `t491a225k035at-etched.step` / `t491a225k035at-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `t491a225k035at.step` / `t491a225k035at.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KEMET datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8566229303105765376) (23 pp, sha256 `e42028e879801428`, retrieved 2026-10-12, 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/t491a225k035at-datasheet.pdf)