{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43NN390K03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43NN390K03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43NN390K03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43NN390K03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series drum core wirewound inductor, LQH43NN390K03L, 39 µH ±10%, 240 mA, unshielded, 1812 (4532 Metric) SMD.","salesMarkdown":"## Parametric fit for DC-DC input and output filtering The LQH43NN390K03L is a 39 µH drum-core wirewound inductor in Murata's LQH43 series, rated for 240 mA continuous current with a maximum DC resistance of 1.4 Ohm. This combination suits low-to-moderate current power rail filtering or energy storage in step-down converters where the inductor sees a DC bias below 240 mA. The unshielded construction means the magnetic field radiates beyond the component body — keep sensitive analog traces or high-impedance nodes at least a few millimeters away on the PCB layout to avoid coupling. ## Thermal and frequency limits The self-resonant frequency of 11 MHz defines the upper bound for inductive behavior; above this frequency the component behaves capacitively, so it is not suitable for switching converters running above roughly 2-3 MHz where the fundamental switching frequency and its harmonics approach SRF. The Q factor of 35 at 1 MHz indicates moderate AC loss — adequate for general-purpose filtering but not optimized for high-Q resonant tank circuits. ## Sourcing and lifecycle position No pin-compatible alternative is documented within the LQH43 family for this exact inductance and current rating.","metaTitle":"Murata LQH43NN390K03L Inductor, 39 µH, 240 mA, 1812","metaDescription":"Murata LQH43NN390K03L drum core wirewound inductor, 39 µH ±10%, 240 mA rated current, 1.4 Ohm DCR, 1812 SMD. Active lifecycle, sourced 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":"35 @ 1MHz","Shielding":"Unshielded","Tolerance":"±10%","Inductance":"39 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)":"1.4Ohm Max","Current Rating (Amps)":"240 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C ~ 105°C","Supplier Device Package":"1812 (4532 Metric)","Frequency - Self Resonant":"11MHz","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 self-resonant frequency and why does it matter?","answer":"The self-resonant frequency is 11 MHz. Above this frequency the inductor behaves capacitively, so it should not be used in switching converters where the fundamental or harmonics exceed roughly 2-3 MHz to avoid unexpected resonance."},{"question":"What compliance documentation does Murata provide for this inductor?","answer":"Murata typically provides RoHS and REACH compliance declarations for the LQH43 series. No UL or IEC certification is listed in the available specifications for this part."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43NN390K03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43NN390K03L 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}}