# BLM18DN221SZ1D

**Murata Electronics** · Ferrite Beads · 0603

BLM18DN221SZ1D from Murata Electronics, in a 0603. 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 | First electrode of the single-circuit ferrite bead, which is non-polarized and rated 1A at 85°C and 650mA at 125°C with 0.21Ω max DC resistance. |
| 2 | 2 | passive | Second electrode of the single-circuit ferrite bead, which has 220Ω ±25% impedance at 100MHz and 650Ω ±30% at 1GHz. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Murata Electronics |
| Package | 0603 |
| 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 (max.) |  |  |  | 0.21 | Ω |  | 2 |
| Impedance (at 100MHz) Tolerance |  | -25 |  | 25 | % | at 100MHz | 2 |
| Impedance (at 1GHz) Tolerance |  | -30 |  | 30 | % | at 1GHz | 2 |
| Operating Temperature Range |  | -55 |  | 125 | ℃ |  | 2 |
| Length Tolerance (nominal 1.6mm) |  | -0.15 |  | 0.15 | mm |  | 2 |
| Width Tolerance (nominal 0.8mm) |  | -0.15 |  | 0.15 | mm |  | 2 |
| Thickness Tolerance (nominal 0.8mm) |  | -0.15 |  | 0.15 | mm |  | 2 |
| Impedance (at 100MHz) |  |  | 220 |  | Ω | at 100MHz | 2 |
| Impedance (at 1GHz) |  |  | 650 |  | Ω | at 1GHz | 2 |
| Rated Current |  |  | 1 |  | A | at 85℃ | 2 |
| Rated Current |  |  | 650 |  | mA | at 125℃ | 2 |
| Length |  |  | 1.6 |  | mm |  | 2 |
| Width |  |  | 0.8 |  | mm |  | 2 |
| Thickness |  |  | 0.8 |  | mm |  | 2 |

## CAD (KiCad official)

- Symbol: `BLM18DN221SZ1D`
- Footprint: `Inductor_SMD:L_0603_1608Metric`
- 3D model: 0603 (KiCad packages3D, STEP)
- 3D model files: `blm18dn221sz1d-etched.step` / `blm18dn221sz1d-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `blm18dn221sz1d.step` / `blm18dn221sz1d.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/8590449024705585152) (3 pp, sha256 `c2f1bf0b9279f08a`, retrieved 2026-11-08, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (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/blm18dn221sz1d-datasheet.pdf)