{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BLM15EX121SN1D","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"BLM15EX121SN1D","canonicalUrl":"https://icboms.com/murata-electronics/BLM15EX121SN1D","factsUrl":"https://icboms.com/api/mcp/products/BLM15EX121SN1D","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics EMIFIL®, BLM15 series ferrite bead, BLM15EX121SN1D, 120 Ohms @ 100 MHz, 1.8 A, 75 mOhm DCR, 1-line, 0402 SMD.","salesMarkdown":"## 120 Ohms at 100 MHz, 1.8 A — the supply-line decoupling gate The BLM15EX121SN1D is a single-line ferrite bead from Murata's EMIFIL® BLM15 series, packaged in 0402 (1005 metric) for surface-mount assembly. Its 120 Ohms impedance at 100 MHz targets noise suppression on power and signal lines where the DC resistance (75 mOhm max) and current rating (1.8 A) limit the voltage drop and thermal rise in the trace. ## 1.8 A continuous, 75 mOhm DCR — the voltage-budget check Rated for 1.8 A continuous current, the 75 mOhm max DCR produces a 135 mV voltage drop at full load. The operating temperature range spans -55 °C to 125 °C, covering industrial and automotive underhood environments. The impedance curve shifts with temperature; at 125 °C the ferrite's permeability drops, reducing the effective suppression at the target frequency by roughly 20 % — a margin to budget for if the bead is the sole filter element in a high-temperature location.","metaTitle":"BLM15EX121SN1D Murata Ferrite Bead, 120 Ohms @ 100 MHz","metaDescription":"Murata BLM15EX121SN1D ferrite bead, 120 Ohms @ 100 MHz, 1.8 A, 75 mOhm DCR, 0402 SMD. Active production. Sourced to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["EMI Filters & Ferrite Beads"],"specifications":{"Mfr":"Murata Electronics","Series":"EMIFIL®, BLM15","Package":"Tape & Reel (TR) Cut Tape (CT)","Ratings":"-","Filter Type":"Power, Signal Line","Height (Max)":"0.022\\\" (0.55mm)","Mounting Type":"Surface Mount","Package / Case":"0402 (1005 Metric)","Product Status":"Active","Number of Lines":"1","lifecycle_stage":"unknown","Size / Dimension":"0.039\\\" L x 0.022\\\" W (1.00mm x 0.55mm)","Base Product Number":"BLM15EX","Current Rating (Max)":"1.8A","Impedance @ Frequency":"120 Ohms @ 100 MHz","Operating Temperature":"-55°C ~ 125°C","DC Resistance (DCR) (Max)":"75mOhm"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.1700","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the DC resistance of BLM15EX121SN1D?","answer":"Maximum DC resistance is 75 mOhm, which at the rated 1.8 A current produces a 135 mV drop. This is the key parameter for supply-rail voltage budget calculations."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/BLM15EX121SN1D","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/BLM15EX121SN1D 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}}