{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43NN4R7M03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43NN4R7M03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43NN4R7M03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43NN4R7M03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series, Drum Core Wirewound Inductor, 4.7 µH, ±20%, 500 mA, Unshielded, 1812 (4532 Metric), Surface Mount.","salesMarkdown":"## Power rail filter and DC-DC output inductor The Murata LQH43NN4R7M03L is a 4.7 µH drum core wirewound inductor in the LQH43 series, rated for 500 mA continuous current with a maximum DC resistance of 400 mOhm. The 4.7 µH value at 500 mA makes it a candidate for output filtering in low-power DC-DC converters or as a supply rail decoupling choke where the load current stays under the rating. Its self-resonant frequency of 38 MHz means the inductor remains inductive well above the switching frequencies of typical buck converters in the 100 kHz to 2 MHz range, so the effective inductance at the switching frequency is close to the nominal 4.7 µH. ## DC resistance and conduction loss budget With a DCR of 400 mOhm max, the I²R loss at the full 500 mA rating is 100 mW. In a compact 1812 package without airflow, that self-heating raises the internal temperature above ambient, so the 105 °C operating limit should be derated when the inductor is placed near other heat sources on the board. The Q factor of 30 at 1 MHz gives a measure of the AC losses in the ferrite core and winding at that frequency. For tuned or resonant circuits operating near 1 MHz, the Q value affects the bandwidth and insertion loss; for a simple filter choke the DCR dominates the loss budget. ## Unshielded ferrite core and PCB layout The unshielded construction means the magnetic field radiates from the component. In a dense layout, keep sensitive analog traces or high-impedance nodes at least a few millimeters away from the inductor body to avoid coupling noise into adjacent circuitry. The 1812 (4532 Metric) footprint is a standard chip size with wide second-source availability. ## Active production and ordering Operating temperature range spans -40 °C to 105 °C, covering industrial and commercial environments. The ferrite core material is stable across this band, though inductance shifts slightly with temperature per the core's characteristic curve.","metaTitle":"Murata LQH43NN4R7M03L Inductor, 4.7 µH, 500 mA, 1812","metaDescription":"Murata LQH43NN4R7M03L drum core wirewound inductor, 4.7 µH ±20%, 500 mA rated current, 400 mOhm DCR max, 1812 SMD. Active lifecycle, available 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":"±20%","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":[{"question":"What is the inductance and current rating of LQH43NN4R7M03L?","answer":"The inductance is 4.7 µH with ±20% tolerance, and the rated current is 500 mA. The DC resistance is 400 mOhm maximum."},{"question":"Is LQH43NN4R7M03L shielded or unshielded?","answer":"It is an unshielded drum core inductor with a ferrite core. The magnetic field radiates from the component, so PCB layout should account for potential coupling to nearby traces."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43NN4R7M03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43NN4R7M03L 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}}