{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43MN390K03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43MN390K03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43MN390K03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43MN390K03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series, Drum Core Wirewound Inductor, 39 µH, ±10%, 240 mA, Unshielded, 1812 (4532 Metric), Surface Mount.","salesMarkdown":"## Drum core wirewound inductor for DC-DC filtering The Murata LQH43MN390K03L is a 39 µH drum core wirewound inductor in the LQH43 series, unshielded, with a ferrite core. The 240 mA current rating and 1.4 Ohm max DCR define its DC bias capability — at full rated current the self-heating from the DCR is about 81 mW, well within the 85°C ambient limit for most power rail filters. ## What the 11 MHz self-resonant frequency means for your filter The self-resonant frequency of 11 MHz sets the upper bound for effective inductive impedance — above this frequency the inductor behaves capacitively. For a buck converter switching at 500 kHz to 2 MHz, the 39 µH value provides adequate ripple attenuation while staying well below the SRF, so the inductor's impedance remains inductive across the switching harmonic band. The Q factor of 35 at 1 MHz indicates moderate energy storage efficiency at that test frequency. In a resonant tank or tuned filter, the 1.4 Ohm DCR contributes to the overall circuit Q; for a simple power rail filter, the DCR matters more for DC voltage drop than for AC losses.","metaTitle":"Murata LQH43MN390K03L Inductor, 39 µH, 240 mA, 1812","metaDescription":"Murata LQH43MN390K03L drum core wirewound inductor, 39 µH ±10%, 240 mA, 1.4 Ohm DCR. Active production, surface mount 1812. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Inductors & Chokes"],"specifications":{"Mfr":"Murata Electronics","Type":"Drum Core, Wirewound","Series":"LQH43","Package":"Tape & Reel (TR)","Ratings":"-","Q @ Freq":"35 @ 1MHz","Shielding":"Unshielded","Tolerance":"±10%","Inductance":"39 µH","Mounting Type":"Surface Mount","Package / Case":"1812 (4532 Metric)","Product Status":"Active","Material - Core":"Ferrite","lifecycle_stage":"unknown","Size / Dimension":"0.177\\\" L x 0.126\\\" W (4.50mm x 3.20mm)","Base Product Number":"LQH43MN","DC Resistance (DCR)":"1.4Ohm Max","Current Rating (Amps)":"240 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"1812","Frequency - Self Resonant":"11MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 MHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.2225","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d1493e4ce66984c31e9b5c6bbb04d9e5.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to LQH43MN390K03L?","answer":"The LQH43 series includes multiple inductance values in the same 1812 footprint. For a 39 µH replacement, any 1812 wirewound inductor with the same inductance, tolerance, and current rating can be a functional alternative, but no official cross-reference is listed by Murata."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43MN390K03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43MN390K03L when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}