# T491B475K010AT

**KEMET** · Tantalum Capacitors · CASE-B-3528-21(mm)

T491B475K010AT from KEMET, in a CASE-B-3528-21(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-B-3528-21(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 |
|---|---|---|---|---|---|---|---|
| Nominal capacitance (rated cap, 4.7 µF for code 475) | C |  | 4.7 |  | µF | Rated capacitance at 120 Hz/25°C, case B/3528-21, 10 VDC | 7 |
| Capacitance tolerance (K = ±10%) | ΔC/C | -10 |  | 10 | % | K tolerance per part-number code K in T491B475K010AT | 2 |
| Rated DC voltage | VR |  |  | 10 | V | Rated voltage at 85°C (code 010 = 10 VDC) | 7 |
| Maximum power dissipation (case B) | Pmax |  |  | 85 | mW | At 25°C with +20°C rise; must be reduced with increasing ambient temperature | 14 |
| Capacitance change vs temperature (−55°C) | ΔC/C | -10 |  | 10 | % | Relative to +25°C initial limit (IL); temperature stability step test | 3 |
| Capacitance change vs temperature (+85°C) | ΔC/C | -10 |  | 10 | % | Relative to +25°C initial limit (IL); temperature stability step test | 3 |
| Capacitance change vs temperature (+125°C) | ΔC/C | -20 |  | 20 | % | Relative to +25°C initial limit (IL); temperature stability step test | 3 |
| Dissipation factor vs temperature (+85°C) | DF |  |  | 1.5 | x IL | Multiple of initial limit at +85°C; temperature stability step test | 3 |
| Dissipation factor vs temperature (+125°C) | DF |  |  | 1.5 | x IL | Multiple of initial limit at +125°C; temperature stability step test | 3 |
| DC leakage vs temperature (+85°C) | DCL |  |  | 10 | x IL | Multiple of initial limit at +85°C; temperature stability step test | 3 |
| DC leakage vs temperature (+125°C) | DCL |  |  | 12 | x IL | Multiple of initial limit at +125°C; temperature stability step test | 3 |
| DC leakage current | DCL |  |  | 0.5 | µA | At +20°C, rated voltage, maximum after 5 minutes (table row for 4.7 µF/10 V B case) | 7 |
| Dissipation factor | DF |  |  | 6 | % | At +20°C, 120 Hz, maximum (table row for 4.7 µF/10 V B case) | 7 |
| Equivalent series resistance | ESR |  |  | 3.5 | Ω | At +20°C, 100 kHz, maximum (table row for 4.7 µF/10 V B case) | 7 |
| Maximum allowable ripple current (rms) | Irms |  |  | 156 | mA | 100 kHz, at +25°C ambient (table row for 4.7 µF/10 V B case) | 7 |
| Maximum allowable ripple current (rms) | Irms |  |  | 140 | mA | 100 kHz, at +85°C ambient (table row for 4.7 µF/10 V B case) | 7 |
| Maximum allowable ripple current (rms) | Irms |  |  | 62 | mA | 100 kHz, at +125°C ambient (table row for 4.7 µF/10 V B case) | 7 |
| Operating temperature range | TA | -55 |  | 125 | °C | Operating temperature range for the T491 series; maximum operating temp 125°C in table row | 2 |
| Recommended maximum application voltage | VApp |  |  | 50 | % of VR | Ambient −55°C to 85°C | 14 |
| Recommended maximum application voltage | VApp |  |  | 33 | % of VR | Ambient 85°C to 125°C | 14 |
| Reflow temperature | TReflow |  |  | 260 | °C | Maximum reflow temperature shown in ratings table header (≤ 260 °C) | 5 |

## CAD (KiCad official)

- Symbol: `T491B475K010AT`
- Footprint: `Capacitor_Tantalum_SMD:CP_EIA-3528-21_Kemet-B`
- 3D model: CASE-B-3528-21(mm) (KiCad packages3D, STEP)
- 3D model files: `t491b475k010at-etched.step` / `t491b475k010at-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `t491b475k010at.step` / `t491b475k010at.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/8588929938561118208) (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/t491b475k010at-datasheet.pdf)