{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43NN121K03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43NN121K03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43NN121K03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43NN121K03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series, Drum Core Wirewound Inductor, 120 µH, ±10 %, 150 mA, 3 Ω DCR, Unshielded, 1812 (4532 Metric) SMD.","salesMarkdown":"## Unshielded drum core — the field leaks The LQH43NN121K03L is a drum-core wirewound inductor with a ferrite core and no magnetic shield — the stray field couples into adjacent PCB traces, so a keep-out zone under and around the part is needed on the layout. Inductance is 120 µH measured at 1 MHz, with a self-resonant frequency of 6.2 MHz — above that frequency the parasitic capacitance turns the inductor capacitive, so the part is only useful as an inductor below 6.2 MHz. ## Q factor and where it peaks Q factor is 40 at 796 kHz — this is the frequency where the inductor's energy storage efficiency peaks; at the self-resonant frequency the Q drops to near-zero as the parasitic capacitance takes over. The 150 mA current rating is the DC bias current at which the inductance typically drops 10 % — the saturation current is higher but not separately quoted in the datasheet; the part derates above 85 °C ambient.","metaTitle":"Murata LQH43NN121K03L 120 µH Wirewound Inductor, 150 mA","metaDescription":"Murata LQH43NN121K03L drum-core wirewound inductor, 120 µH, 150 mA, 3 Ω DCR, 1812 SMD. Active production. Quoted to order against RFQ.","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) Cut Tape (CT)","Ratings":"-","Q @ Freq":"40 @ 796kHz","Shielding":"Unshielded","Tolerance":"±10%","Inductance":"120 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":"LQH43NN","DC Resistance (DCR)":"3Ohm Max","Current Rating (Amps)":"150 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C ~ 105°C","Supplier Device Package":"1812 (4532 Metric)","Frequency - Self Resonant":"6.2MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 MHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.2818","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d0d6b1d39c76e30b3c05600906460c39.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the self-resonant frequency of LQH43NN121K03L?","answer":"The self-resonant frequency is 6.2 MHz — above this frequency the inductor behaves capacitively and is no longer useful as an inductor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43NN121K03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43NN121K03L 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}}