{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43NN121J03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43NN121J03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43NN121J03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43NN121J03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series drum core wirewound inductor, 120 µH, ±5%, 150 mA, unshielded, 1812 (4532 Metric) SMD package.","salesMarkdown":"## 120 µH wirewound in 1812 — DC bias and AC loss trade-offs The LQH43NN121J03L is a drum-core wirewound inductor from Murata's LQH43 series, delivering 120 µH ±5% in the standard 1812 (4532 Metric) SMD footprint. The 150 mA current rating is the DC bias limit before inductance begins to roll off — stay below this for the full 120 µH value. 3 Ω max DCR sets the I²R self-heating floor: at 150 mA the copper loss is 67.5 mW, which raises the internal temperature above the 105 °C max ambient. The unshielded construction means the external field couples into adjacent traces — keep sensitive analog or RF routing at least one part-width away. ## Q factor and self-resonant frequency — the usable band Q is 40 at 796 kHz, placing the peak efficiency in the low hundreds of kHz — typical for buck converters switching at 200–500 kHz. Above 6.2 MHz the inductor becomes capacitive; the self-resonant frequency sets the hard ceiling for the application. The 1 MHz test frequency for inductance means the 120 µH value is characterised near the top of the useful range. Ferrite core material gives stable inductance from -40 °C to 105 °C, with permeability dropping off above the Curie point.","metaTitle":"Murata LQH43NN121J03L 120 µH Unshielded Inductor, 150 mA","metaDescription":"Murata LQH43NN121J03L drum core wirewound inductor, 120 µH ±5%, 150 mA rated current, 3 Ω max DCR, 1812 SMD. 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":"40 @ 796kHz","Shielding":"Unshielded","Tolerance":"±5%","Inductance":"120 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)":"3Ohm Max","Current Rating (Amps)":"150 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C ~ 105°C","Supplier Device Package":"1812 (4532 Metric)","Frequency - Self Resonant":"6.2MHz","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/d0d6b1d39c76e30b3c05600906460c39.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the maximum DC current before the inductance drops?","answer":"The rated current is 150 mA — this is the DC bias at which the inductance typically falls by 10 % from the nominal 120 µH value."},{"question":"What compliance documentation does Murata provide for LQH43NN121J03L?","answer":"The part is RoHS-compliant and REACH-compliant per Murata's standard material declarations. No UL or IEC certification is listed for this component."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43NN121J03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43NN121J03L 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}}