{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43MN3R9M03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43MN3R9M03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43MN3R9M03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43MN3R9M03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series, Drum Core Wirewound Inductor, 3.9 µH, ±20%, 500 mA, 380 mOhm DCR, Unshielded, 1812 (4532 Metric), Surface Mount.","salesMarkdown":"## 3.9 µH drum core wirewound in 1812 The Murata LQH43MN3R9M03L is a 3.9 µH drum core wirewound inductor in the LQH43 series, built on a ferrite core and terminated for surface-mount reflow assembly in the 1812 (4532 Metric) footprint. Rated for 500 mA DC with a maximum DCR of 380 mOhm, the I²R loss at full current is about 95 mW — well within the 85°C ambient ceiling for an unshielded part in free air. ## Self-resonant frequency and Q factor The self-resonant frequency is 41 MHz, meaning the inductor behaves inductively up to that point; above it the parasitic capacitance dominates and the impedance rolls off. Q factor is 20 at 1 MHz, typical for a ferrite-core wirewound in this inductance range — adequate for filtering and DC-DC output stages where the switching frequency sits well below 41 MHz.","metaTitle":"LQH43MN3R9M03L Murata 3.9 µH Inductor, 500 mA, 1812","metaDescription":"Murata LQH43MN3R9M03L drum core wirewound inductor, 3.9 µH ±20%, 500 mA, 380 mOhm DCR, 1812 SMD. Active production, 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":"20 @ 1MHz","Shielding":"Unshielded","Tolerance":"±20%","Inductance":"3.9 µH","Mounting Type":"Surface Mount","Package / Case":"1812 (4532 Metric)","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)":"380mOhm 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":"41MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 MHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.2172","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d1493e4ce66984c31e9b5c6bbb04d9e5.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to LQH43MN3R9M03L?","answer":"The LQH43 series shares the same 1812 footprint, but a parametric search for 3.9 µH ±20%, 500 mA, unshielded wirewound in 1812 will yield functionally equivalent parts from other manufacturers — pin compatibility depends on the specific pad layout and height clearance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43MN3R9M03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43MN3R9M03L 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}}