# Samsung CL21A X5R MLCC (0805)

**Samsung Electro-Mechanics** · Multilayer ceramic capacitor, X5R · 0805 (2012 metric)

Samsung CL21A multilayer ceramic capacitors in 0805 with X5R dielectric: the bulk decoupling values. As with every class II ceramic, the effective capacitance falls with DC bias, so derate by the bias curve in the datasheet.

**Part numbers:** every value's LCSC, Mouser and DigiKey number is in the table below ("not listed" means that distributor has no listing for it). The symbol, the 3D model and the sidebar show one of them, `CL21A106KAYNNNE` (10 µF), the value used most on the AM/FM board. `samsung-cl21a-x5r-0805-values.kicad_sym` has a symbol for every value with its part numbers as properties.

## Part numbers

Every row uses the same footprint, symbol and 3D model (same case size and land pattern). Values and ratings are from the LCSC parametric listing (2026-10-08); the linked datasheet is the source of truth.

| Part number | Capacitance | Tolerance | Voltage Rating | Dielectric / TC | LCSC | Mouser | DigiKey | Datasheet |
|---|---|---|---|---|---|---|---|---|
| `CL21A106KAYNNNE` | 10uF | ±10% | 25V | X5R | [C15850](https://www.lcsc.com/product-detail/C15850.html) | [187-CL21A106KAYNNNE](https://www.mouser.com/en/ProductDetail/Samsung-Electro-Mechanics/CL21A106KAYNNNE?qs=yOVawPpwOwmTXAd4dJtNjA%3D%3D) | [1276-2891-2-ND](https://www.digikey.com/en/products/detail/samsung-electro-mechanics/CL21A106KAYNNNE/3888549) | [PDF](docs/datasheets/CL21A106KAYNNNE.pdf) |
| `CL21A226MAQNNNE` | 22uF | ±20% | 25V | X5R | [C45783](https://www.lcsc.com/product-detail/C45783.html) | [187-CL21A226MAQNNNE](https://www.mouser.com/en/ProductDetail/Samsung-Electro-Mechanics/CL21A226MAQNNNE?qs=yOVawPpwOwn5SPpGykCwnw%3D%3D) | [1276-2908-2-ND](https://www.digikey.com/en/products/detail/samsung-electro-mechanics/CL21A226MAQNNNE/3888566) | [PDF](docs/datasheets/CL21A106KAYNNNE.pdf) |

Other values used on the AM/FM board already had their own pages: [CL21A475KAQNNNE](https://wiki.adom.inc/adom/cl21a475kaqnnng) (4.7 µF).

## Verification

A person checks each page against its datasheet and signs it off here; the badge turns amber if a checked file changes.

::adom-verified{src="/adom/samsung-cl21a-x5r-0805/render/verification.json"}

## CAD

| File | What it is |
|---|---|
| `samsung-cl21a-x5r-0805.kicad_sym` | KiCad symbol for `CL21A106KAYNNNE`, the representative value, with MPN, manufacturer and distributor numbers as properties |
| `samsung-cl21a-x5r-0805-values.kicad_sym` | KiCad symbols for all 2 values, one per part number, each with its own MPN, LCSC, Mouser and DigiKey properties |
| `samsung-cl21a-x5r-0805.kicad_mod` | KiCad footprint: `Capacitor_SMD:C_0805_2012Metric`, KiCad official, CC-BY-SA 4.0 |
| `samsung-cl21a-x5r-0805.step` / `samsung-cl21a-x5r-0805.glb` | 3D model, Z-up, seated on z = 0: KiCad packages3D (tag 10.0.6), C_0805_2012Metric.step |
| `samsung-cl21a-x5r-0805.lbr` | Fusion 360 / EAGLE library: one deviceset per part (2), each with its own MPN, manufacturer and LCSC / Mouser / DigiKey attributes |
| `altium/Adom_samsung_cl21a_x5r_0805.SchLib` / `.PcbLib` | Altium library pair (adom-lbr, no Altium needed): 2 components, parameters carry the part numbers; `altium/*.adom-lbr.json` is the canonical hub each was built from |

## Provenance

- **Datasheet (CL21A106KAYNNNE):** [docs/datasheets/CL21A106KAYNNNE.pdf](docs/datasheets/CL21A106KAYNNNE.pdf), sha256 `96baebe4bd0ce363`, retrieved 2026-10-08 from LCSC
- **Specs:** each row names its source: the manufacturer datasheet (with page) or the LCSC parametric listing (retrieved 2026-10-08).
- **Distributor numbers:** looked up 2026-10-08 with adom-parts-search (Mouser, DigiKey, JLCPCB), exact part number and manufacturer only.
- **CAD:** footprint `Capacitor_SMD:C_0805_2012Metric`; 3D: KiCad packages3D (tag 10.0.6), C_0805_2012Metric.step.

## Related

- Used on the [AM/FM Receiver Molecule](https://wiki.adom.inc/adom/amfm-receiver-molecule).