{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH31MN3R9K03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH31MN3R9K03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH31MN3R9K03L","factsUrl":"https://icboms.com/api/mcp/products/LQH31MN3R9K03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH31 series, Drum Core Wirewound Inductor, 3.9 µH, ±10%, 125 mA, 1.95 Ohm DCR, 1206 (3216 Metric), Unshielded.","salesMarkdown":"## 3.9 µH wirewound in 1206 — the Last Buy window Murata has flagged the LQH31MN3R9K03L as Last Buy — the final production window is open, not closed. Once the last-time-buy date passes, the only channel will be surplus and broker inventory, where date-code provenance and lot traceability become the buyer's own risk. For a BOM that already uses this value, the decision is whether to secure a lifetime buy now or qualify a replacement before the Murata stock dries up. ## 125 mA current ceiling and 1.95 Ohm DCR — the real-world limit Rated for 125 mA continuous, the LQH31MN3R9K03L's DC resistance of 1.95 Ohm max sets the self-heating budget. At full rated current, I²R loss is about 30 mW — within the 1206 body's dissipation capability in still air, but the temperature rise at the core will be higher in a dense layout with restricted airflow. The 35.3 MHz self-resonant frequency means this inductor behaves as an inductor well into the HF band. For a buck converter switching at 500 kHz to 2 MHz, the SRF is comfortably above the switching harmonics, so the impedance stays inductive where it is needed for ripple filtering. The Q of 35 at 8 MHz is typical for a ferrite-core wirewound of this size — adequate for tuned circuits in that range, but not a high-Q part for narrowband RF filtering. ## Unshielded drum core — board layout considerations This is an unshielded drum-core construction with a ferrite core. The open magnetic field means the inductor will couple into adjacent traces and components — keep sensitive analog or RF traces at least one body width away, and avoid running a ground plane directly under the inductor if the field would induce eddy currents that reduce the effective inductance. The 1206 (3216 metric) footprint is standard; the 2.00 mm seated height is low enough for most card-edge or mezzanine clearances.","metaTitle":"Murata LQH31MN3R9K03L 3.9 µH Drum Core Inductor, 125 mA","metaDescription":"Murata LQH31MN3R9K03L 3.9 µH wirewound inductor, 125 mA, 1.95 Ohm DCR, 1206 SMD. Last Buy lifecycle. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Last Buy","categoryPath":["Inductors & Chokes"],"specifications":{"Mfr":"Murata Electronics","Type":"Drum Core, Wirewound","Series":"LQH31","Package":"Tape & Reel (TR); Cut Tape (CT)","Ratings":"-","Q @ Freq":"35 @ 8MHz","Shielding":"Unshielded","Tolerance":"±10%","Inductance":"3.9 µH","Mounting Type":"Surface Mount","Package / Case":"1206 (3216 Metric)","Product Status":"Last Time Buy","Material - Core":"Ferrite","lifecycle_stage":"unknown","Size / Dimension":"0.126\\\" L x 0.063\\\" W (3.20mm x 1.60mm)","Base Product Number":"LQH31MN","DC Resistance (DCR)":"1.95Ohm Max","Current Rating (Amps)":"125 mA","Height - Seated (Max)":"0.079\\\" (2.00mm)","Operating Temperature":"-40°C~85°C","Supplier Device Package":"1206","Frequency - Self Resonant":"35.3MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 MHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7100","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/23793266b202ae546e5047be20f0e556.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest alternative to LQH31MN3R9K03L?","answer":"The LQH31MN3R9K03L is a 3.9 µH, 125 mA, unshielded wirewound in a 1206 package. Any replacement would need to match the inductance, current rating, DCR, and footprint. A direct parametric search across other Murata LQH31 series values or a competitor's 1206 wirewound is the practical path — but no official cross-reference exists."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH31MN3R9K03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH31MN3R9K03L when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}