{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43NN271J03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43NN271J03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43NN271J03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43NN271J03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series, Drum Core Wirewound Inductor, 270 µH, ±5%, 100 mA, Unshielded, 1812 (4532 Metric) SMD, Ferrite Core.","salesMarkdown":"The LQH43NN271J03L is a drum-core wirewound inductor from Murata's LQH43 series, in the standard 1812 (4532 Metric) SMD footprint. Its 270 µH inductance and 100 mA current rating place it in the mid-value filtering range for DC-DC converter output stages or signal-line chokes where the load current stays under 100 mA. ## DCR and Q — the efficiency trade-off DC resistance is 6.8 Ω maximum — at the full 100 mA rating, the I²R loss is 68 mW, which heats the part above ambient. The Q factor is 40 at 796 kHz, meaning the inductive reactance is 40 times the effective series resistance at that frequency; efficiency is best near the test frequency and drops as you move away from it. Self-resonant frequency is 4 MHz — above that point the inductor's parasitic capacitance dominates and the impedance becomes capacitive. Keep the switching frequency or the noise frequency of interest well below 4 MHz to stay in the inductive region. ## Unshielded construction — layout matters The part is unshielded, so the magnetic field radiates from the drum core. In a dense PCB layout, keep the inductor away from sensitive analog traces, low-level signal paths, or other magnetics to avoid coupling. If crosstalk is a concern, a shielded ferrite-bead or shielded inductor from the same series is a better fit. Operating temperature range is -40°C to +105°C, which covers most industrial and automotive cabin environments. The ferrite core material maintains inductance stability across that band, though the DCR increases with temperature.","metaTitle":"Murata LQH43NN271J03L 270 µH Unshielded Inductor, 100 mA","metaDescription":"Murata LQH43NN271J03L drum-core wirewound inductor, 270 µH ±5%, 100 mA, 6.8 Ω DCR, 1812 SMD. Active production.","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":"40 @ 796kHz","Shielding":"Unshielded","Tolerance":"±5%","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":"LQH43NN","DC Resistance (DCR)":"6.8Ohm Max","Current Rating (Amps)":"100 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C ~ 105°C","Supplier Device Package":"1812 (4532 Metric)","Frequency - Self Resonant":"4MHz","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 compliance documentation does Murata provide for LQH43NN271J03L?","answer":"The evidence does not list specific compliance documentation (RoHS, REACH, UL, IEC) for this part. Typical Murata inductors in the LQH43 series are RoHS-compliant, but confirm the specific certification at time of order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43NN271J03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43NN271J03L 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}}