{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43NN102K03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43NN102K03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43NN102K03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43NN102K03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series drum-core wirewound inductor, LQH43NN102K03L, 1 mH ±10%, 50 mA, 25 Ω DCR, unshielded, 1812 (4532 Metric) SMD.","salesMarkdown":"## 1 mH filter inductor for low-current signal and power paths The Murata LQH43NN102K03L is a 1 mH drum-core wirewound inductor in the LQH43 series, rated for 50 mA continuous with a maximum DC resistance of 25 Ω. At 50 mA the I²R loss is 62.5 mW — the thermal rise stays under 10°C in free air, but a tight layout with adjacent heat sources should budget the self-heating into the local ambient. The unshielded ferrite core means the stray field couples into nearby traces and components — keep a keep-out zone equal to the part height (2.8 mm) on adjacent copper layers to avoid eddy-current losses in ground planes or detuning in adjacent LC tanks. ## Frequency response and Q factor — where this inductor works Self-resonant frequency is 2 MHz; above this the inductor behaves capacitively. The Q factor is 40 at 252 kHz — useful for resonant tank circuits or EMI filtering in the low hundreds of kHz, but the Q drops off above 1 MHz as the core losses dominate. Inductance is tested at 1 kHz, which is the standard low-frequency reference. At the self-resonant frequency the effective inductance drops to zero — a filter designed at 1 MHz sees a fraction of the nominal 1 mH, so the cutoff frequency shifts. Derate the inductance by 20% at 500 kHz for a conservative filter pole calculation.","metaTitle":"Murata LQH43NN102K03L inductor, 1 mH, 50 mA, 1812","metaDescription":"Murata LQH43NN102K03L drum-core wirewound inductor, 1 mH ±10%, 50 mA, 25 Ω DCR, 1812 SMD. Active production, available 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":"40 @ 252kHz","Shielding":"Unshielded","Tolerance":"±10%","Inductance":"1 mH","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)":"25Ohm Max","Current Rating (Amps)":"50 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C~105°C","Supplier Device Package":"1812 (4532 Metric)","Frequency - Self Resonant":"2MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 kHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.3158","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d0d6b1d39c76e30b3c05600906460c39.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the LQH43NN102K03L's type and series?","answer":"Drum Core, Wirewound construction in the LQH43 series from Murata Electronics."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43NN102K03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43NN102K03L 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}}