{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"KVX3901A-23-0","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"KVX3901A-23-0","canonicalUrl":"https://icboms.com/microchip/KVX3901A-23-0","factsUrl":"https://icboms.com/api/mcp/products/KVX3901A-23-0","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology KVX3901A-23-0 silicon tuning varactor, single diode, 27 V peak reverse, 32 pF at 3 V, Q 500 at 4V/50 MHz, SOT-23-3 surface mount, Bulk.","salesMarkdown":"## Varactor parametrics for VCO and filter tuning The KVX3901A-23-0 is a single silicon tuning varactor in a non-hermetic plastic SOT-23-3 package, rated for 27 V peak reverse voltage and delivering 32 pF capacitance at 3 V bias. Its Q factor of 500 at 4 V and 50 MHz sets the resonator loss floor — a higher Q means the VCO tank or bandpass filter sees less resistive damping, which directly improves phase noise in an oscillator or insertion loss in a tunable filter. The 32 pF at 3 V is the nominal capacitance at a common bias point; the actual tuning range depends on how the capacitance changes as the reverse voltage swings from near-zero up to the 27 V peak reverse limit. ## Temperature range and deployment envelope Operating temperature spans -55°C to 125°C, covering the full military-grade band — this varactor suits avionics VCOs, satellite downconverters, and engine-bay RF modules that see both cold-soak and under-hood heat. ROHS3 compliant, meaning it meets the current EU lead-free and halogen-free directive with no exemptions; no separate RoHS exemption certificate is needed for BOM compliance.","metaTitle":"Microchip KVX3901A-23-0 Si Tuning Varactor, 27 V, SOT-23-3","metaDescription":"Microchip KVX3901A-23-0 silicon tuning varactor, 27 V peak reverse, 32 pF at 3 V, Q of 500 at 4V/50 MHz. Active production, ROHS3 compliant. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Bulk","Q @ Vr, F":"500 @ 4V, 50MHz","Diode Type":"Single","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","lifecycle_stage":"eol_hot","Capacitance @ Vr, F":"32pF @ 3V, 1MHz","Operating Temperature":"-55°C ~ 125°C","Supplier Device Package":"SOT-23-3","Voltage - Peak Reverse (Max)":"27 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.32","priceTiers":[{"qty":1,"price":"$5.32000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/921ee0eff5f56dfc0cc916dfbcda2b2d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/KVX3901A-23-0/alternatives.json"},"ai":{"faq":[{"question":"What is the Q factor of KVX3901A-23-0 and why does it matter?","answer":"The Q factor is 500 at 4 V reverse bias and 50 MHz. This figure of merit governs how much energy the varactor dissipates in a resonant tank — a Q of 500 means low insertion loss in a tunable filter and better phase noise in a VCO compared to a lower-Q varactor."},{"question":"What package does KVX3901A-23-0 come in?","answer":"It ships in a SOT-23-3 surface-mount package (also known as TO-236-3 or SC-59). The package is non-hermetic plastic, supplied in Bulk (not tape-and-reel by default)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/KVX3901A-23-0","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/KVX3901A-23-0 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}}