{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43MN4R7K03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43MN4R7K03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43MN4R7K03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43MN4R7K03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series drum core wirewound inductor, LQH43MN4R7K03L, 4.7 µH ±10%, 500 mA, 400 mOhm DCR, unshielded, 1812 (4532 Metric) SMD.","salesMarkdown":"## 4.7 µH at 500 mA — DC bias and power rail filter fit The LQH43MN4R7K03L is a 4.7 µH drum core wirewound inductor rated for 500 mA continuous current. At that DC bias the 400 mOhm maximum DCR drops about 200 mV and dissipates 100 mW — well within the 85°C ambient limit for a ferrite-core part in a 1812 footprint. Its 38 MHz self-resonant frequency means the inductor behaves inductively up to about 10–15 MHz in practice; above that the winding capacitance starts to dominate. For a buck converter switching at 1–2 MHz the SRF gives plenty of margin. ## Unshielded construction — layout awareness This is an unshielded drum core (ferrite core, wirewound on a bobbin). The stray magnetic field extends beyond the component body — keep sensitive analog traces, RF front-ends, or other magnetics at least 3–5 mm away on the same layer. The Q factor is 30 at 1 MHz, a moderate figure typical of ferrite-core wirewounds in this size. The AC resistance at the switching frequency will be higher than the 400 mOhm DC value; budget the additional copper loss if the ripple current is a significant fraction of the 500 mA rating. ## 1812 SMD footprint and temperature grade Standard reflow profile for a ferrite-core part — no special bake-out required unless the tape has been exposed to high humidity. The ferrite core material is stable across this range; the inductance shift with temperature is typically less than ±5%.","metaTitle":"Murata LQH43MN4R7K03L 4.7 µH Inductor, 500 mA, 1812","metaDescription":"Murata LQH43MN4R7K03L drum core wirewound inductor, 4.7 µH ±10%, 500 mA, 400 mOhm DCR, 38 MHz SRF, 1812 SMD. Active production. 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) Cut Tape (CT)","Ratings":"-","Q @ Freq":"30 @ 1MHz","Shielding":"Unshielded","Tolerance":"±10%","Inductance":"4.7 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)":"400mOhm Max","Current Rating (Amps)":"500 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"1812","Frequency - Self Resonant":"38MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 MHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5100","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d1493e4ce66984c31e9b5c6bbb04d9e5.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy LQH43MN4R7K03L and how is it quoted?","answer":"The LQH43MN4R7K03L is an active Murata part sourced through independent and authorized distribution."},{"question":"What is the self-resonant frequency of LQH43MN4R7K03L?","answer":"The self-resonant frequency is 38 MHz. The inductor is inductive up to roughly one-third of that frequency; above 10–15 MHz the parasitic capacitance begins to dominate the impedance."},{"question":"Is LQH43MN4R7K03L shielded or unshielded?","answer":"It is unshielded. The open drum core radiates a stray magnetic field, so keep sensitive circuitry and other magnetics at a distance on the PCB layout."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43MN4R7K03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43MN4R7K03L 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}}