{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LQH31MN3R9J03L","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"LQH31MN3R9J03L","canonicalUrl":"https://icboms.com/murata-electronics/LQH31MN3R9J03L","factsUrl":"https://icboms.com/api/mcp/products/LQH31MN3R9J03L","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics LQH31 series, Drum Core Wirewound Inductor, 3.9 µH, ±5%, 125 mA, 1.5 Ohm DCR, Unshielded, 1206 (3216 Metric) SMD, Tape & Reel.","salesMarkdown":"## 3.9 µH wirewound inductor for signal filtering and DC-DC input/output The Murata LQH31MN3R9J03L is a 3.9 µH drum core wirewound inductor in the LQH31 series, rated for 125 mA continuous current with a DC resistance of 1.5 Ohm. The 1.5 Ohm DCR means at full rated current the inductor dissipates about 23 mW as heat — negligible in most circuits, but the voltage drop across the winding matters for low-voltage rails where every millivolt counts. Unshielded construction means the magnetic field radiates from the core. Board layout should keep sensitive analog traces, low-level signal lines, or other magnetics at least a few millimeters away to avoid coupling. The ferrite core material gives stable inductance over frequency up to the self-resonant point of 35 MHz. ## Frequency response and Q factor — where this inductor works best With a Q factor of 35 at 8 MHz and a self-resonant frequency of 35 MHz, this inductor is well-suited for filtering and impedance matching in the low-MHz range — think EMI filter output stages, LC tank circuits below 10 MHz, or DC-DC converter input/output filters switching in the hundreds of kHz to low MHz. Above 35 MHz the inductor becomes capacitive and loses its inductive behavior. The inductance is tested at 1 MHz, which is the standard test frequency for this value range. The ±5% tolerance gives tighter control than the ±10% or ±20% grades common on power inductors — useful when the inductance value directly sets a filter cutoff or oscillator frequency. ## Package and board assembly — 1206 SMD, tape and reel The 1206 footprint is widely supported by pick-and-place equipment and reflow profiles; no special nozzle or handling required. Operating temperature range is -40°C to +85°C, covering commercial and most industrial indoor environments. Not rated for extended automotive under-hood temperatures or high-humidity outdoor exposure without conformal coating consideration.","metaTitle":"Murata LQH31MN3R9J03L 3.9 µH Inductor, 125 mA, 1206","metaDescription":"Murata LQH31MN3R9J03L drum core wirewound inductor, 3.9 µH ±5%, 125 mA, 1.5 Ohm DCR, 1206 SMD. Active production. 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":"LQH31","Package":"Tape & Reel (TR)","Ratings":"-","Q @ Freq":"35 @ 8MHz","Shielding":"Unshielded","Tolerance":"±5%","Inductance":"3.9 µH","Mounting Type":"Surface Mount","Package / Case":"1206 (3216 Metric)","Product Status":"Active","Material - Core":"Ferrite","lifecycle_stage":"unknown","Size / Dimension":"0.126\\\" L x 0.063\\\" W (3.20mm x 1.60mm)","Base Product Number":"LQH31MN","DC Resistance (DCR)":"1.5Ohm","Current Rating (Amps)":"125 mA","Height - Seated (Max)":"0.079\\\" (2.00mm)","Operating Temperature":"-40°C~85°C","Supplier Device Package":"1206 (3216 Metric)","Frequency - Self Resonant":"35MHz","Current - Saturation (Isat)":"-","Inductance Frequency - Test":"1 MHz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.3152","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/23793266b202ae546e5047be20f0e556.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the inductance and current rating of LQH31MN3R9J03L?","answer":"The inductor is 3.9 µH with ±5% tolerance and a rated current of 125 mA. DC resistance is 1.5 Ohm. These ratings make it suitable for signal filtering and low-current DC-DC converter applications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/LQH31MN3R9J03L","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/LQH31MN3R9J03L 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}}