# T491A474K025AT

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

T491A474K025AT 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 | Positive terminal (pad 1 of the CP_ footprint; symbol and 3D mark the + end). |
| 2 | - | passive | Negative terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KEMET |
| Package | CASE-A-3216-18(mm) |
| Category | Capacitors |
| 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 |
|---|---|---|---|---|---|---|---|
| DC leakage current, maximum after 5 minutes | DCL |  |  | 0.5 | µA | at +20°C, maximum/5 minutes, 25 V rating | 11 |
| Dissipation factor, maximum | DF |  |  | 4 | % | at +20°C, 120 Hz | 11 |
| Equivalent series resistance, maximum | ESR |  |  | 13 | Ω | at +20°C, 100 kHz | 11 |
| Maximum allowable ripple current (rms) |  |  |  | 76 | mA | 100 kHz, +25°C | 11 |
| Maximum allowable ripple current (rms) |  |  |  | 68 | mA | 100 kHz, +85°C | 11 |
| Maximum allowable ripple current (rms) |  |  |  | 30 | mA | 100 kHz, +125°C | 11 |
| Capacitance tolerance |  | -10 |  | 10 | % | K suffix (±10%) | 2 |
| Capacitance change with temperature |  | -10 |  | 10 | % | Δ C/C at −55°C vs +25°C initial limit (IL) | 3 |
| Capacitance change with temperature |  | -20 |  | 20 | % | Δ C/C at +125°C vs +25°C initial limit (IL) | 3 |
| Operating temperature range |  | -55 |  | 125 | °C |  | 2 |
| Recommended maximum application voltage |  |  |  | 50 | % of VR | −55°C to 85°C | 14 |
| Recommended maximum application voltage |  |  |  | 33 | % of VR | 85°C to 125°C | 14 |
| Maximum power dissipation (P max) |  |  |  | 75 | mW | Case A 3216-18, at 25°C with +20°C rise | 14 |
| Rated voltage |  |  |  | 25 | VDC | at 85°C | 11 |
| Rated capacitance |  |  | 0.47 |  | µF | 120 Hz/25°C | 11 |

## CAD (KiCad official)

- Symbol: `T491A474K025AT`
- Footprint: `Capacitor_Tantalum_SMD:CP_EIA-3216-18_Kemet-A`
- 3D model: CASE-A-3216-18(mm) (KiCad packages3D, STEP)
- 3D model files: `t491a474k025at-etched.step` / `t491a474k025at-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `t491a474k025at.step` / `t491a474k025at.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/8588930153255092224) (23 pp, sha256 `271b6cea80c8b55f`, retrieved 2026-10-14, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `two-terminal convention` (convention), consensus `off` (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/t491a474k025at-datasheet.pdf)