{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43MN271K03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43MN271K03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43MN271K03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43MN271K03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series, Drum Core Wirewound Inductor, 270 µH, ±10%, 100 mA, 6.8 Ohm DCR, Unshielded, 1812 (4532 Metric), Surface Mount, Tape & Reel.","salesMarkdown":"## 270 µH unshielded wirewound — the DC resistance tells the story The LQH43MN271K03L is a drum-core ferrite inductor from Murata's LQH43 series, wound on a ferrite core and housed in a standard 1812 (4532 metric) surface-mount package. It delivers 270 µH ±10% at 1 MHz test frequency, with a DC resistance of 6.8 Ohm max — that DCR is the number that governs conduction loss in the circuit. Rated for 100 mA continuous current, the part is sized for low-to-moderate current branches in power supply filters, decoupling networks, and signal conditioning paths where the inductance value matters more than the current handling. Unshielded construction means the magnetic field couples into adjacent traces and components — keep sensitive analog or RF routing clear of the inductor's footprint on the PCB. ## Frequency ceiling and Q factor The self-resonant frequency is 4 MHz — above this point the inductor behaves capacitively, so the effective inductance rolls off. For a 270 µH part, the SRF is the practical upper bound for the operating frequency in a filter or resonant tank. Q factor is 40 at 796 kHz, which is typical for a ferrite-core wirewound in this inductance range. The Q peaks near the test frequency and drops off on either side; at frequencies well below 796 kHz the reactance is small relative to the DCR, so the Q falls. The ferrite core material's permeability shifts with temperature, so the inductance value drifts across the range — budget this into the circuit tolerance stack-up. No shielding means the inductor's magnetic field extends beyond the package boundary. In a dense layout, maintain clearance to adjacent inductors and sensitive traces, or plan for a shielded alternative if cross-coupling becomes an issue during EMC testing.","metaTitle":"Murata LQH43MN271K03L 270µH Drum Core Inductor, 100 mA","metaDescription":"Murata LQH43MN271K03L 270 µH ±10% unshielded wirewound inductor, 1812 SMD, 100 mA, 6.8 Ohm DCR. Active production, tape and reel. Quoted 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)","Ratings":"-","Q @ Freq":"40 @ 796kHz","Shielding":"Unshielded","Tolerance":"±10%","Inductance":"270 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)":"6.8Ohm Max","Current Rating (Amps)":"100 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"1812","Frequency - Self Resonant":"4MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 MHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.2225","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d1493e4ce66984c31e9b5c6bbb04d9e5.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the self-resonant frequency and why does it matter?","answer":"The self-resonant frequency is 4 MHz. Above this frequency the inductor behaves as a capacitor, so the effective inductance drops sharply. For filter or decoupling applications, keep the operating frequency well below the SRF to maintain the intended inductance value."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43MN271K03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43MN271K03L 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}}