{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43MN181J03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43MN181J03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43MN181J03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43MN181J03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series, Drum Core Wirewound Inductor, 180 µH, ±5%, 120 mA, 4.5 Ohm DCR, Unshielded, 1812 (4532 Metric), Surface Mount.","salesMarkdown":"## 180 µH at 120 mA — what the ratings mean for your filter or decoupling node The LQH43MN181J03L is a drum-core wirewound inductor rated 180 µH ±5% at 120 mA continuous. The 4.5 Ohm max DCR means at full rated current the winding dissipates about 65 mW — negligible for most boards, but if you are running near the current limit in a tight thermal spot, the self-heating shifts the inductance a few percent as the ferrite core warms. Unshielded construction means the stray field couples into nearby traces. Keep a keep-out zone around the 1812 footprint if you have a sensitive analog or RF node within a few millimeters. ## Frequency range — where this inductor actually works The self-resonant frequency is 5 MHz. Above that the inductor behaves capacitively, so the useful band for filtering or energy storage tops out around 2–3 MHz. The Q factor is specified at 796 kHz — 40 minimum — which is decent for a drum-core part in this inductance range and tells you the AC losses are manageable up to a few MHz. Test frequency for the 180 µH value is 1 MHz, right in the middle of the useful range. If your switching regulator runs above 3 MHz, this part is not the right choice — look at the LQH43 series' shielded variants or a ferrite-bead alternative. ## Board-fit and temperature envelope 1812 (4532 metric) footprint, 4.50 mm × 3.20 mm, seated height 2.80 mm. Standard pick-and-place, no special reflow profile beyond the usual for ferrite-core wirewounds.","metaTitle":"Murata LQH43MN181J03L 180 µH Inductor, 120 mA, 1812","metaDescription":"Murata LQH43MN181J03L drum-core wirewound inductor, 180 µH ±5%, 120 mA, 4.5 Ohm DCR, 1812 SMD. Active lifecycle, quoted 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 @ 796kHz","Shielding":"Unshielded","Tolerance":"±5%","Inductance":"180 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":"LQH43MN","DC Resistance (DCR)":"4.5Ohm Max","Current Rating (Amps)":"120 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"1812","Frequency - Self Resonant":"5MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 MHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4500","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d1493e4ce66984c31e9b5c6bbb04d9e5.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the inductance tolerance and current rating?","answer":"180 µH ±5% with a 120 mA continuous current rating. The 4.5 Ohm max DCR is the main thermal constraint — at full current the self-heating is modest, but derate if ambient exceeds 85 °C."},{"question":"What package and footprint does LQH43MN181J03L use?","answer":"Standard 1812 (4532 metric) surface-mount package, 4.50 mm × 3.20 mm, seated height 2.80 mm. Unshielded drum-core construction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43MN181J03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43MN181J03L 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}}