# BLM31KN102SZ1L

**Murata Electronics** · Ferrite Beads · 1206

BLM31KN102SZ1L from Murata Electronics, in a 1206. 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 | 1206 |
| 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 | % |  | 1 |
| DC resistance (initial values) |  |  |  | 0.075 | Ω | Initial values; DC Resistance (Ω max.) | 1 |
| DC resistance (after testing) |  |  |  | 0.09 | Ω | Values after testing; DC Resistance (Ω max.) | 1 |
| Rated current |  |  |  | 2000 | mA | at 85°C (Note1) | 1 |
| Rated current |  |  |  | 1400 | mA | at 125°C (Note1, derated) | 1 |
| Operating temperature |  | -55 |  | 125 | °C |  | 1 |
| Storage temperature |  | -55 |  | 125 | °C |  | 1 |
| Impedance change (Table A after testing) |  | -50 |  | 50 | % | at 100MHz; after testing, Table A | 2 |
| Impedance change (Table B after testing) |  | -30 |  | 30 | % | at 100MHz; after testing, Table B | 3 |
| Impedance |  |  | 1000 |  | Ω | at 100MHz, under standard testing condition | 1 |

## CAD (KiCad official)

- Symbol: `BLM31KN102SZ1L`
- Footprint: `Inductor_SMD:L_1206_3216Metric`
- 3D model: 1206 (KiCad packages3D, STEP)
- 3D model files: `blm31kn102sz1l-etched.step` / `blm31kn102sz1l-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `blm31kn102sz1l.step` / `blm31kn102sz1l.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/8589837788826013696) (9 pp, sha256 `f47c8f2380bd025e`, retrieved 2026-10-18, 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/blm31kn102sz1l-datasheet.pdf)