{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43NN4R7K03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43NN4R7K03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43NN4R7K03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43NN4R7K03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series drum-core wirewound inductor, LQH43NN4R7K03L, 4.7 µH ±10%, 500 mA, 400 mΩ DCR, unshielded, 1812 (4532 Metric) SMD.","salesMarkdown":"## What this 4.7 µH wirewound inductor does on the board The LQH43NN4R7K03L is a drum-core, wirewound inductor from Murata's LQH43 series, built on a ferrite core and unshielded. Its 4.7 µH inductance at 1 MHz test frequency and 500 mA current rating suit it for DC-DC converter input/output filtering, power-line smoothing, and low-frequency noise suppression in surface-mount designs. The unshielded construction means the magnetic field is not contained within a ferrite shield — adjacent traces or components within a few millimeters may couple noise, so layout spacing and orientation matter more than with a shielded part. ## Q factor and self-resonant frequency — filter bandwidth limits With a Q of 30 at 1 MHz and a self-resonant frequency of 38 MHz, this inductor behaves as a pure inductance up to roughly 10 MHz; above that, parasitic capacitance between windings begins to dominate, and the impedance peak near 38 MHz marks the upper frequency limit for effective filtering. For a buck converter switching at 500 kHz to 2 MHz, the inductor's impedance remains inductive with low AC losses, but for a 10 MHz switching regulator the margin to self-resonance is only about 4×, which may introduce ringing or efficiency degradation. Murata lists the LQH43NN4R7K03L as Active on its lifecycle status — no PCN or last-time-buy notice has been issued. This inductor is suitable for both new product introductions and ongoing production without obsolescence-driven redesign. The 1812 (4532 Metric) footprint and tape-and-reel packaging (cut tape available) keep it compatible with standard pick-and-place assembly.","metaTitle":"Murata LQH43NN4R7K03L 4.7 µH Unshielded Wirewound Inductor","metaDescription":"Murata LQH43NN4R7K03L drum-core wirewound inductor, 4.7 µH ±10%, 500 mA, 400 mΩ 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":"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":"LQH43NN","DC Resistance (DCR)":"400mOhm 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":"38MHz","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":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43NN4R7K03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43NN4R7K03L 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}}