# BLM15AX121SN1D11

**Murata Electronics** · Ferrite Beads · 0402

BLM15AX121SN1D11 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 of the chip ferrite bead, 120 ohm ±25% at 100 MHz, rated current 700 mA at 85°C and 600 mA at 125°C. Electrodes are interchangeable, with no polarity. |
| 2 | 2 | passive | Second terminal of the chip ferrite bead, in series with terminal 1 (equivalent circuit is an inductor in series with a resistor), DC resistance 0.13 ohm max at 85°C and 0.18 ohm max at 125°C. |

## 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 |  | -25 |  | 25 | % | At 100MHz; printed ±25% for BLM15AX121SN1D11 | 3 |
| Impedance change after tests |  | -30 |  | 30 | % | At 100MHz, after mechanical and environmental tests (Sec. 7-2, 7-3); the ±40% limit applies to BLM15PD only | 4 |
| Rated current |  |  |  | 700 | mA |  | 3 |
| DC resistance, initial |  |  |  | 0.13 | Ω | Initial values column; digital multimeter, excluding substrate and wire resistance | 3 |
| DC resistance, after testing |  |  |  | 0.18 | Ω | After Testing values column (heading as printed) | 3 |
| Impedance (nominal) |  |  | 120 |  | Ω | At 100MHz, standard testing condition | 3 |
| Operating temperature |  | -55 |  | 125 | °C | Operating temperature | 3 |
| Storage temperature |  | -55 |  | 125 | °C | Storage temperature (printed under Rating) | 3 |
| Reflow standard profile peak temperature tolerance |  | -3 |  | 3 | °C | Standard profile, peak 245°C ±3°C, 2 reflow cycles | 8 |
| Reflow limit profile peak temperature |  |  |  | 260 | °C | Limit profile, 10 s, 2 reflow cycles | 8 |
| Time above 220°C during reflow |  | 30 |  | 60 | s | Standard profile, heating above 220°C | 8 |
| Limit profile time above 230°C during reflow |  |  |  | 60 | s | Limit profile, heating above 230°C, 60 s max | 8 |
| Pre-heating temperature difference |  |  |  | 150 | °C | Between solder and ferrite surface during pre-heating | 8 |
| Cooling temperature difference after soldering |  |  |  | 100 | °C | Cooling into solvent after soldering | 8 |
| Rework soldering iron tip temperature |  |  |  | 350 | °C | Soldering iron tip temperature, 3 s, 2 times max | 8 |
| Cleaning temperature |  |  |  | 60 | °C | Cleaning temperature limit; 40°C max for IPA | 10 |

## CAD (KiCad official)

- Symbol: `BLM15AX121SN1D11`
- Footprint: `Inductor_SMD:L_0402_1005Metric`
- 3D model: 0402 (KiCad packages3D, STEP)
- 3D model files: `blm15ax121sn1d11-etched.step` / `blm15ax121sn1d11-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `blm15ax121sn1d11.step` / `blm15ax121sn1d11.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/8757979366549016576) (11 pp, sha256 `f97878af8b79f2dc`, retrieved 2026-10-23, 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/blm15ax121sn1d11-datasheet.pdf)