# BLM21SP331BH1D

**Murata Electronics** · Ferrite Beads · 0805

BLM21SP331BH1D from Murata Electronics, in a 0805. 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 | 0805 |
| 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 |
|---|---|---|---|---|---|---|---|
| DC Resistance |  |  |  | 0.04 | Ω |  | 3 |
| Operating Temperature Range |  | -55 |  | 150 | ℃ |  | 3 |
| Rated Current |  |  |  | 2.8 | A | at 85℃ | 3 |
| Rated Current |  |  |  | 1.9 | A | at 125℃ | 3 |
| Rated Current |  |  |  | 10 | mA | at 150℃ | 3 |
| Impedance tolerance |  | -25 |  | 25 | % | Impedance at 100MHz | 3 |
| Impedance |  |  | 330 |  | Ω | at 100MHz | 3 |

## CAD (KiCad official)

- Symbol: `BLM21SP331BH1D`
- Footprint: `Inductor_SMD:L_0805_2012Metric`
- 3D model: 0805 (KiCad packages3D, STEP)
- 3D model files: `blm21sp331bh1d-etched.step` / `blm21sp331bh1d-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `blm21sp331bh1d.step` / `blm21sp331bh1d.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/8600385705793507328) (4 pp, sha256 `972b202b58dd086e`, 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/blm21sp331bh1d-datasheet.pdf)