{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43NN122J03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43NN122J03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43NN122J03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43NN122J03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series, Drum Core Wirewound Inductor, 1.2 mH, ±5%, 45 mA, Unshielded, 1812 (4532 Metric) SMD.","salesMarkdown":"## 1.2 mH drum core wirewound — what the ratings mean for the BOM The Murata LQH43NN122J03L is a drum core, wirewound inductor in the LQH43 series, rated 1.2 mH ±5% at 1 kHz test frequency. The 45 mA DC current rating is the bias current at which inductance typically drops by 10% — stay below this to avoid saturation in a filter or DC-DC output choke. Maximum DC resistance is 30 Ohm, which at 45 mA produces a 61.5 mW I²R loss — negligible in most circuits but worth checking if the inductor sits in a high-ambient enclosure where self-heating compounds the temperature rise. Self-resonant frequency is 1.8 MHz; above that the parasitic capacitance dominates and the part stops behaving as an inductor. The Q factor of 40 at 252 kHz gives a figure of merit for tuned or resonant applications — a higher Q means lower circulating losses at that frequency. ## Package and temperature grade — board-fit and environment The ferrite core is unshielded, so adjacent traces carrying high-frequency or high-current signals may couple magnetically — keep a keep-out zone or orient the inductor orthogonal to nearby magnetics. The ferrite core material has a Curie temperature well above 105°C, so the inductance drop over temperature is dominated by the DC bias, not the thermal profile. Product status is Active per Murata's lifecycle records — no end-of-life or last-time-buy notice on file.","metaTitle":"Murata LQH43NN122J03L Inductor, 1.2 mH, 45 mA, 1812","metaDescription":"Murata LQH43NN122J03L drum core wirewound inductor, 1.2 mH ±5%, 45 mA rated current, 30 Ohm DCR, 1812 SMD package. Active lifecycle, sourced 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":"±5%","Inductance":"1.2 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)":"30Ohm Max","Current Rating (Amps)":"45 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C ~ 105°C","Supplier Device Package":"1812 (4532 Metric)","Frequency - Self Resonant":"1.8MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 kHz"}},"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 closest alternative to LQH43NN122J03L in the same family?","answer":"Within the LQH43 series, other inductance values and tolerances share the same 1812 footprint and ferrite core construction. The deciding factor for a BOM substitution is the exact inductance, current rating, and DCR — no single pin-compatible drop-in is listed as an official cross-reference."},{"question":"What compliance documentation does Murata provide for this inductor?","answer":"Murata Electronics typically supplies RoHS and REACH compliance declarations for the LQH43 series. Specific certificates are available on request at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43NN122J03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43NN122J03L 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}}