{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BB172X","brand":"NXP Semiconductors","brandSlug":"nxp","productSlug":"BB172X","canonicalUrl":"https://icboms.com/nxp/BB172X","factsUrl":"https://icboms.com/api/mcp/products/BB172X","rawCanonicalId":null},"summary":{"shortDescription":"NXP BB172X VHF varactor diode, single, surface mount SOD-323, capacitance ratio 15 (C1/C28), 2.754pF @ 28V, 1MHz, 32 V peak reverse, -55°C to 125°C.","salesMarkdown":"## VHF varactor for VCO and filter tuning The BB172X is a single VHF varactor diode in a SOD-323 surface-mount package, designed for voltage-controlled oscillator (VCO) and filter tuning applications where a predictable capacitance-versus-voltage characteristic is needed. Its capacitance ratio of 15 gives a tuning range that covers VHF bands without needing a multi-diode stack, simplifying the bias network and board layout. With a peak reverse voltage rating of 32 V, the diode supports tuning voltages up to that level, which sets the upper frequency limit in the LC tank. ## Capacitance ratio and tuning range — what matters for the VCO The capacitance ratio is measured as the capacitance at 1 V reverse bias divided by the capacitance at 28 V reverse bias, both at 1 MHz. A ratio of 15 means the diode can vary its capacitance by a factor of 15 over that bias range, which directly translates to the frequency tuning range of the resonant circuit. The capacitance at 28 V is 2.754 pF.","metaTitle":"BB172X VHF Varactor Diode, 15 Capacitance Ratio, SOD-323","metaDescription":"Single VHF varactor diode in SOD-323, capacitance ratio 15 (C1/C28), 32 V peak reverse, -55°C to 125°C. Active, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":[],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Diode Type":"Single","Mounting Type":"Surface Mount","Package / Case":"SC-76, SOD-323","lifecycle_stage":"eol_hot","Capacitance Ratio":"15","Capacitance @ Vr, F":"2.754pF @ 28V, 1MHz","Operating Temperature":"-55°C ~ 125°C (TJ)","Supplier Device Package":"SOD-323","Capacitance Ratio Condition":"C1/C28","Voltage - Peak Reverse (Max)":"32 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.54","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.54000","currency":"USD"},{"qty":10,"price":"$0.44100","currency":"USD"},{"qty":100,"price":"$0.30040","currency":"USD"},{"qty":500,"price":"$0.22528","currency":"USD"},{"qty":1000,"price":"$0.16897","currency":"USD"},{"qty":3000,"price":"$0.15489","currency":"USD"},{"qty":6000,"price":"$0.14840","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/bc315c309da8e7a9cdd6bbb0d27e0a64.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the capacitance ratio of BB172X?","answer":"The capacitance ratio is 15, measured as C1/C28 at 1 MHz. This means the capacitance at 1 V reverse bias is 15 times the capacitance at 28 V reverse bias, giving a useful tuning range for VHF VCO and filter circuits."},{"question":"Does BB172X come in tape and reel packaging?","answer":"Yes, it is available in Tape & Reel (TR) and also Cut Tape (CT) options for prototyping or small-batch assembly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/nxp/BB172X","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/nxp/BB172X when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}