{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH43NN330K03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH43NN330K03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH43NN330K03L","factsUrl":"https://icboms.com/api/mcp/products/LQH43NN330K03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH43 series, Drum Core Wirewound Inductor, 33 µH, ±5%, 270 mA, 1.2 Ohm DCR, Unshielded, 1812 (4532 Metric) SMD.","salesMarkdown":"## Inductance and current rating for DC-DC filtering The LQH43NN330K03L is a 33 µH drum-core wirewound inductor rated for 270 mA DC current. At that bias the inductance holds within tolerance; push beyond 270 mA and the ferrite core begins to saturate, dropping the effective inductance and raising ripple current in a buck output stage. Maximum DC resistance is 1.2 Ohm, which at 270 mA produces about 87 mW of I²R loss — negligible for most power rails but worth derating if the inductor sits in a confined enclosure above 85°C ambient. ## Frequency limits and Q factor Self-resonant frequency is 12 MHz. Above that the parasitic capacitance across the winding dominates and the part behaves capacitively — keep the switching frequency or the fundamental ripple frequency below 12 MHz for inductive behaviour. Q factor is 35 at 1 MHz, typical for a ferrite-core wirewound in this inductance range. The Q peak sits near the SRF; if the circuit operates far below 1 MHz the AC losses increase and the effective inductance shifts slightly. ## Package and reflow profile The unshielded construction means the magnetic field extends outside the body — keep sensitive traces or other magnetics at least one package width away to avoid coupling. Supplied on tape and reel in cut-tape quantities. The ferrite core is brittle; avoid excessive board flex near the part after reflow.","metaTitle":"Murata LQH43NN330K03L 33 µH Unshielded Inductor, 270 mA","metaDescription":"Murata LQH43NN330K03L drum core wirewound inductor, 33 µH ±5%, 270 mA, 1.2 Ohm DCR, 1812 SMD, -40°C to +105°C. Active part, 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":"35 @ 1MHz","Shielding":"Unshielded","Tolerance":"±5%","Inductance":"33 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)":"1.2Ohm Max","Current Rating (Amps)":"270 mA","Height - Seated (Max)":"0.110\\\" (2.80mm)","Operating Temperature":"-40°C ~ 105°C","Supplier Device Package":"1812 (4532 Metric)","Frequency - Self Resonant":"12MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 MHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.2818","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d0d6b1d39c76e30b3c05600906460c39.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to LQH43NN330K03L in the LQH43 family?","answer":"The LQH43 series includes multiple inductance values in the same 1812 footprint. A direct pin-compatible alternative would be another LQH43 part with the same package and the inductance value your circuit requires. The LQH43NN330K03L is the 33 µH ±5% variant; if the tolerance or inductance needs to change, stay within the LQH43 series for footprint compatibility."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH43NN330K03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH43NN330K03L 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}}