{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43NN391K03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43NN391K03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43NN391K03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43NN391K03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series drum core wirewound inductor, 390 µH, ±10%, 90 mA, unshielded, 1812 (4532 Metric) SMD.","salesMarkdown":"## Parametric fit for a 390 µH line This Murata LQH43NN391K03L is a drum core, wirewound inductor offering 390 µH inductance with ±10% tolerance. The 90 mA current rating sets the DC bias ceiling — above that the inductance rolls off as the core approaches saturation, so budget derating for ripple current in a buck converter or inrush in a filter stage. Maximum DC resistance is 9.7 Ohm, which at 90 mA dissipates about 78 mW — fine for a standard 1812 footprint but worth checking against the board's thermal budget if the inductor sits near a hot component or in a high-ambient enclosure. The self-resonant frequency is 3.3 MHz, and Q is 40 at 796 kHz, so this part is best suited for low-frequency filtering or energy storage below 1 MHz where the Q factor matters for efficiency. ## Board-level integration and environment The unshielded construction means magnetic flux radiates — keep sensitive traces or low-level analog circuits at least a few millimeters away to avoid coupling. The ferrite core material maintains inductance stability across this band, but DCR increases with temperature — expect about 10% rise at 85°C ambient. ## Supply and lifecycle posture The 1812 footprint is widely second-sourced across Murata's LQH43 family and other manufacturers, so qualifying an alternate for dual-source risk mitigation is straightforward.","metaTitle":"Murata LQH43NN391K03L Inductor, 390 µH, 90 mA, 1812","metaDescription":"Murata LQH43NN391K03L drum core wirewound inductor, 390 µH ±10%, 90 mA rated current, 9.7 Ohm DCR, 1812 SMD, active production. Request a quote.","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":"390 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)":"9.7Ohm Max","Current Rating (Amps)":"90 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C~105°C","Supplier Device Package":"1812 (4532 Metric)","Frequency - Self Resonant":"3.3MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 MHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6000","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d0d6b1d39c76e30b3c05600906460c39.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the inductance and current rating of LQH43NN391K03L?","answer":"390 µH ±10% with a 90 mA DC current rating. The 9.7 Ohm maximum DCR sets the I²R loss at full current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43NN391K03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43NN391K03L 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}}