{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43MN1R0M03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43MN1R0M03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43MN1R0M03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43MN1R0M03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series, Drum Core Wirewound Inductor, 1 µH, ±20%, 500 mA, 200 mOhm DCR, 1812 (4532 Metric), Unshielded, Ferrite Core.","salesMarkdown":"## 1 µH, 500 mA in a 1812 drum core The Murata LQH43MN1R0M03L is a drum-core wirewound inductor in the LQH43 series, delivering 1 µH at 500 mA from a standard 1812 (4532 Metric) footprint. The 200 mOhm max DCR means the DC winding loss at full rated current is 50 mW — that is the heat the part sheds into the pad and via array, not the core. Unshielded construction means the magnetic field is not contained by a ferrite shield — adjacent traces carrying sensitive analog signals or another inductor should be kept at least one body width away to avoid coupling. ## Self-resonance and Q factor Self-resonant frequency is 120 MHz — the inductor behaves inductively up to that point; above it the inter-winding capacitance dominates and the impedance drops. For a DC-DC converter switching at 500 kHz to 2 MHz, the 120 MHz SRF gives plenty of headroom so the inductor stays inductive across the switching harmonics. Q factor is 20 at 1 MHz. This is a moderate Q typical of a power-grade ferrite drum core — adequate for input/output filtering in a buck or boost stage, but not a tuned-circuit inductor. The 20% tolerance on the 1 µH nominal means the actual inductance can range from 0.8 µH to 1.2 µH; the DC bias current does not significantly shift it because the core is not gapped, but saturation onset starts above the 500 mA rating. ## Active lifecycle, no second-source on record It is suitable for ongoing production and new designs. No pin-compatible second-source or direct replacement is listed on the record; the 1812 footprint and the 1 µH / 500 mA / 200 mOhm DCR window are common enough that a parametric search will find alternatives, but the LQH43 series specific pad layout and height profile (2.80 mm seated) should be confirmed against any candidate. The part ships on Tape & Reel (TR) or Cut Tape (CT) — standard for pick-and-place assembly.","metaTitle":"Murata LQH43MN1R0M03L 1 µH Unshielded Inductor, 500 mA","metaDescription":"Murata LQH43MN1R0M03L drum core wirewound inductor, 1 µH ±20%, 500 mA, 200 mOhm DCR, 1812 SMD. Active lifecycle, 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":"20 @ 1MHz","Shielding":"Unshielded","Tolerance":"±20%","Inductance":"1 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)":"200mOhm 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":"120MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 MHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5500","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d1493e4ce66984c31e9b5c6bbb04d9e5.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What compliance documentation does Murata provide for LQH43MN1R0M03L?","answer":"The part is a standard commercial-grade inductor. Murata typically provides RoHS and REACH compliance declarations for the LQH43 series. No UL or IEC certification is listed on the record for this specific order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43MN1R0M03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43MN1R0M03L 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}}