# T491A225M020AT

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

T491A225M020AT 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 |
|---|---|---|---|---|---|---|---|
| Capacitance tolerance (M = ±20%) |  | -20 |  | 20 | % | Part number suffix M = ±20% | 2 |
| Rated voltage |  |  |  | 20 | VDC | Rated voltage at 85°C (020 = 20 VDC) | 10 |
| DC leakage |  |  |  | 0.5 | µA | at +20°C, maximum at 5 minutes, rated voltage | 10 |
| Dissipation factor (DF) | DF |  |  | 6 | % | at +20°C, 120 Hz, maximum | 10 |
| ESR | ESR |  |  | 6 | Ω | at +20°C, 100 kHz, maximum | 10 |
| Maximum allowable ripple current (rms) |  |  |  | 104 | mA | at +25°C, 100 kHz, maximum | 10 |
| Maximum allowable ripple current (rms) |  |  |  | 94 | mA | at +85°C, 100 kHz, maximum | 10 |
| Maximum allowable ripple current (rms) |  |  |  | 42 | mA | at +125°C, 100 kHz, maximum | 10 |
| Maximum power dissipation (Pmax), case A | Pmax |  |  | 75 | mW | at 25°C with +20°C rise, case A 3216-18 | 14 |
| Operating temperature range |  | -55 |  | 125 | °C | Operating temperature range | 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 |
| Capacitance change at −55°C | ΔC/C | -10 |  | 10 | % | Relative to +25°C initial limit (IL), −55°C | 3 |
| Capacitance change at +85°C | ΔC/C | -10 |  | 10 | % | Relative to +25°C initial limit (IL), +85°C | 3 |
| Capacitance change at +125°C | ΔC/C | -20 |  | 20 | % | Relative to +25°C initial limit (IL), +125°C | 3 |
| Dissipation factor at +85°C | DF |  |  | 1.5 | x IL | Multiple of initial limit at +85°C (temperature stability) | 3 |
| Dissipation factor at +125°C | DF |  |  | 1.5 | x IL | Multiple of initial limit at +125°C (temperature stability) | 3 |
| DC leakage at +85°C | DCL |  |  | 10 | x IL | Multiple of initial limit at +85°C (temperature stability) | 3 |
| DC leakage at +125°C | DCL |  |  | 12 | x IL | Multiple of initial limit at +125°C (temperature stability) | 3 |
| Endurance capacitance change | ΔC/C | -10 |  | 10 | % | 85°C at rated voltage 2,000 h, or 125°C at 2/3 rated voltage 2,000 h | 3 |
| Storage life capacitance change | ΔC/C | -10 |  | 10 | % | 125°C at 0 V, 2,000 h | 3 |
| Thermal shock capacitance change | ΔC/C | -5 |  | 5 | % | MIL-STD-202 Method 107 Cond. B, −55°C to 125°C, 1,000 cycles | 3 |
| Surge capacitance change | ΔC/C | -5 |  | 5 | % | 85°C, 1.32 × rated voltage, 1,000 cycles (125°C, 1.2 ×) | 3 |
| Rated capacitance | C |  | 2.2 |  | µF | Part number 225 = 2.2 µF, measured at 120 Hz/25°C | 10 |

## CAD (KiCad official)

- Symbol: `T491A225M020AT`
- Footprint: `Capacitor_Tantalum_SMD:CP_EIA-3216-18_Kemet-A`
- 3D model: CASE-A-3216-18(mm) (KiCad packages3D, STEP)
- 3D model files: `t491a225m020at-etched.step` / `t491a225m020at-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `t491a225m020at.step` / `t491a225m020at.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/8588876839133175808) (23 pp, sha256 `271b6cea80c8b55f`, retrieved 2026-10-13, 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/t491a225m020at-datasheet.pdf)