{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43NN270J03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43NN270J03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43NN270J03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43NN270J03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series drum core wirewound inductor, 27 µH, ±5% tolerance, 300 mA rated current, 1.1 Ω max DCR, unshielded, 1812 (4532 Metric) SMD package.","salesMarkdown":"## Active production, 27 µH wirewound for power and signal filtering The Murata LQH43NN270J03L is an active-production drum core wirewound inductor in the LQH43 series, offering 27 µH inductance with ±5% tolerance in a standard 1812 (4532 Metric) surface-mount package. Rated for 300 mA continuous current with a maximum DC resistance of 1.1 Ω, this unshielded inductor suits low-to-moderate current filtering in DC-DC converter output stages, power supply rails, and signal conditioning circuits where the 27 µH value provides adequate ripple attenuation. ## What the 27 µH and 300 mA ratings mean for your board The 27 µH inductance at 1 MHz test frequency with a self-resonant frequency of 14 MHz means this inductor behaves as an inductor well into the low-MHz switching range — above 14 MHz the parasitic capacitance dominates and the impedance starts dropping, so keep the switching frequency below that ceiling for predictable filtering. The 300 mA current rating is the DC bias current at which the inductance typically drops by 10% due to core saturation — derate for ambient temperature above 85°C and for AC ripple current, which adds core heating beyond the DC heating from the 1.1 Ω DCR. A Q factor of 35 at 1 MHz indicates moderate energy efficiency at that frequency — acceptable for general-purpose filtering but not optimal for high-Q resonant tank circuits where you would typically look for Q above 50. ## Temperature range and unshielded construction Operating from -40°C to +105°C, the ferrite core material maintains stable inductance across the industrial temperature band — the core permeability drops above 100°C, so inductance may shift a few percent near the upper limit. Being unshielded, this inductor radiates a magnetic field that can couple into adjacent traces or components — keep sensitive analog or RF circuitry at least 5 mm away, or use a shielded variant from the same LQH43 family if cross-coupling becomes an issue in layout.","metaTitle":"Murata LQH43NN270J03L 27 µH Inductor, 300 mA, 1812","metaDescription":"Murata LQH43NN270J03L drum core wirewound inductor, 27 µH ±5%, 300 mA, 1.1 Ω DCR, unshielded, 1812 SMD, -40 to +105°C. Active production, 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":"35 @ 1MHz","Shielding":"Unshielded","Tolerance":"±5%","Inductance":"27 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)":"1.1Ohm Max","Current Rating (Amps)":"300 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C ~ 105°C","Supplier Device Package":"1812 (4532 Metric)","Frequency - Self Resonant":"14MHz","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 closest pin-compatible alternative to LQH43NN270J03L?","answer":"Within the same LQH43 series, the shielded variant LQH43MN270J03L offers the same 27 µH inductance and 1812 footprint with magnetic shielding, at the cost of a slightly higher DCR and lower saturation current. For a drop-in replacement with identical inductance and current rating, the unshielded LQH43NN270J03L is the direct choice."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43NN270J03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43NN270J03L 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}}