# BLM15KD121SN1D11

**Murata Electronics** · Ferrite Beads · 0402

BLM15KD121SN1D11 from Murata Electronics, in a 0402. 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 | 1 | passive | Terminal 1 of an unpolarised inductor or ferrite bead; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised inductor or ferrite bead; either orientation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Murata Electronics |
| Package | 0402 |
| Category | Filters |
| 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 |
|---|---|---|---|---|---|---|---|
| Impedance tolerance at 100MHz |  | -25 |  | 25 | % | Impedance 120±25% at 100MHz | 3 |
| DC resistance (initial values) |  |  |  | 0.07 | Ω | Initial values, max. | 3 |
| DC resistance (after testing) |  |  |  | 0.085 | Ω | After testing, max. | 3 |
| Rated current at 85°C |  |  |  | 1500 | mA | at 85°C; derated per note *1 above 85°C | 3 |
| Rated current at 125°C |  |  |  | 930 | mA | at 125°C | 3 |
| Impedance change at 100MHz |  | -30 |  | 30 | % | After mechanical and environmental tests (BLM15PD excepted) | 4 |
| Operating temperature |  | -55 |  | 125 | °C |  | 3 |
| Storage temperature |  | -55 |  | 125 | °C |  | 3 |
| Impedance (nominal) |  |  | 120 |  | Ω | at 100MHz, standard testing condition | 3 |

## CAD (KiCad official)

- Symbol: `BLM15KD121SN1D11`
- Footprint: `Inductor_SMD:L_0402_1005Metric`
- 3D model: 0402 (KiCad packages3D, STEP)
- 3D model files: `blm15kd121sn1d11-etched.step` / `blm15kd121sn1d11-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `blm15kd121sn1d11.step` / `blm15kd121sn1d11.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Murata Electronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757979382855929856) (11 pp, sha256 `f97878af8b79f2dc`, retrieved 2026-10-17, 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/blm15kd121sn1d11-datasheet.pdf)