{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43MN121K03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43MN121K03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43MN121K03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43MN121K03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series, Drum Core Wirewound Inductor, 120 µH, ±10%, 150 mA, 3 Ohm DCR, Unshielded, 1812 (4532 Metric), Tape & Reel.","salesMarkdown":"## 120 µH wirewound for filter and bias-T applications The Murata LQH43MN121K03L is a drum-core wirewound inductor in the LQH43 series, offering 120 µH inductance with ±10% tolerance in an 1812 (4532 Metric) surface-mount package. Rated for 150 mA continuous current with a maximum DC resistance of 3 Ohm, it is suited for power supply filtering, DC-DC converter output chokes, and bias-T circuits where the inductance value and current rating align with the rail budget. ## Self-resonant frequency and Q factor — where the inductor behaves The self-resonant frequency (SRF) is 6.2 MHz, meaning the inductor's impedance peaks and its inductive behavior transitions to capacitive above that frequency — keep the operating frequency well below 6.2 MHz to avoid unexpected filtering roll-off or resonance. Q factor is specified at 40 measured at 796 kHz, indicating moderate energy efficiency at that test frequency; the actual Q varies with frequency and is highest near the SRF, but the 796 kHz point gives a reference for filter insertion loss in the low-MHz range. The unshielded drum-core construction means the magnetic field extends outside the component — adjacent traces or other inductors on the same board may couple, so maintain spacing or orient orthogonal to sensitive circuits. ## Temperature range and board-fit for the 1812 footprint Operating temperature range is -40°C to +85°C, covering industrial and commercial environments but not extended automotive under-hood or high-temperature power supply sections where ambient exceeds 85°C.","metaTitle":"Murata LQH43MN121K03L Inductor, 120 µH, 150 mA, 1812","metaDescription":"Murata LQH43MN121K03L drum core wirewound inductor, 120 µH, 150 mA, 3 Ohm DCR, 1812 package, active production. 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)","Ratings":"-","Q @ Freq":"40 @ 796kHz","Shielding":"Unshielded","Tolerance":"±10%","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":"LQH43MN","DC Resistance (DCR)":"3Ohm Max","Current Rating (Amps)":"150 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"1812","Frequency - Self Resonant":"6.2MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 MHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.2225","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d1493e4ce66984c31e9b5c6bbb04d9e5.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the current rating and DC resistance of LQH43MN121K03L?","answer":"The inductor is rated for 150 mA continuous current with a maximum DC resistance of 3 Ohm. The 3 Ohm DCR will produce a voltage drop of 0.45 V at full rated current, which should be factored into the circuit's headroom budget."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43MN121K03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43MN121K03L 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}}