{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BLM15PX121SZ1D","brand":"Murata Electronics","brandSlug":"murata-electronics","productSlug":"BLM15PX121SZ1D","canonicalUrl":"https://icboms.com/murata-electronics/BLM15PX121SZ1D","factsUrl":"https://icboms.com/api/mcp/products/BLM15PX121SZ1D","rawCanonicalId":null},"summary":{"shortDescription":"Murata Electronics EMIFIL®, BLM15 series ferrite bead, BLM15PX121SZ1D, 0402 (1005 metric), 120 Ohms @ 100 MHz, 2 A, 55 mOhm DCR, AEC-Q200.","salesMarkdown":"## Power-line ferrite bead, 0402, AEC-Q200 The BLM15PX121SZ1D is a single-line ferrite bead from Murata's EMIFIL® BLM15 series, packaged in a 0402 (1005 metric) surface-mount body. AEC-Q200 qualification places this bead in the automotive-grade bin: it is tested for the thermal cycling, moisture resistance, and mechanical shock profiles required in under-hood and chassis-mounted electronics. The -55 to 125 °C operating range covers the full automotive temperature envelope with margin. ## What the 120 Ohm impedance and 2 A rating mean for the BOM The 120 Ohm impedance at 100 MHz is the bead's peak suppression point — it attenuates conducted noise in the 30-300 MHz band where switching regulators and digital clocks radiate. Below 10 MHz the bead behaves as a low-resistance conductor; above 300 MHz the impedance rolls off as parasitic capacitance dominates. The 2 A current rating is the DC bias limit before the ferrite material saturates and the impedance collapses. Derate this for ambient temperatures above 85 °C — at 125 °C the bead's self-heating plus ambient reduces the effective current ceiling by roughly 30 %, so a 1.4 A continuous load is a safer design-in for high-temp applications. It is a current-design-in part, not a last-time-buy scavenge.","metaTitle":"Murata BLM15PX121SZ1D Ferrite Bead, 120 Ohm @ 100 MHz, 2A","metaDescription":"Murata BLM15PX121SZ1D EMIFIL ferrite bead, 120 Ohm @ 100 MHz, 2 A, 55 mOhm DCR, 0402, AEC-Q200. Active production, quoted to order.","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":"AEC-Q200","Filter Type":"Power 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":"BLM15PX","Current Rating (Max)":"2A","Impedance @ Frequency":"120 Ohms @ 100 MHz","Operating Temperature":"-55°C ~ 125°C","DC Resistance (DCR) (Max)":"55mOhm"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.1100","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/47421877a8ccd614873519959a109225.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/murata-electronics/BLM15PX121SZ1D","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/murata-electronics/BLM15PX121SZ1D 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}}