{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43NN3R9M03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43NN3R9M03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43NN3R9M03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43NN3R9M03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series drum-core wirewound inductor, unshielded, 3.9 µH ±20%, 500 mA, 380 mOhm DCR, 1812 (4532 Metric) SMD package.","salesMarkdown":"## 3.9 µH drum-core wirewound for power-line filtering The Murata LQH43NN3R9M03L is a drum-core wirewound inductor in the LQH43 series, unshielded, with a ferrite core. It delivers 3.9 µH ±20% inductance at 1 MHz test frequency, rated for 500 mA continuous current with a maximum DC resistance of 380 mOhm. The 500 mA current rating and 380 mOhm DCR mean this part suits low-to-moderate current power-supply filtering or decoupling where the voltage drop across the inductor stays under 190 mV at full load. The self-resonant frequency of 41 MHz sets the upper limit for effective filtering — above that the inductor behaves capacitively. ## 1812 SMD package and rework considerations The unshielded drum-core construction means the magnetic field extends beyond the body — keep sensitive traces or components at least one package width away to avoid coupling. Pin 1 orientation is marked by a dot on the body — verify polarity if the layout uses the dot for consistent pick-and-place.","metaTitle":"Murata LQH43NN3R9M03L Inductor, 3.9 µH, 500 mA, 1812","metaDescription":"Murata LQH43NN3R9M03L drum-core wirewound inductor, 3.9 µH ±20%, 500 mA, 380 mOhm DCR, 1812 SMD. Active production, sourced per 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":"20 @ 1MHz","Shielding":"Unshielded","Tolerance":"±20%","Inductance":"3.9 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)":"380mOhm Max","Current Rating (Amps)":"500 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C ~ 105°C","Supplier Device Package":"1812 (4532 Metric)","Frequency - Self Resonant":"41MHz","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":"Where can I buy LQH43NN3R9M03L and how is it quoted?","answer":"Submit an RFQ for a firm offer."},{"question":"What is the self-resonant frequency and Q factor of this inductor?","answer":"The self-resonant frequency is 41 MHz, and the Q factor is 20 measured at 1 MHz."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43NN3R9M03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43NN3R9M03L 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}}