{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"KVX38S2-23-0","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"KVX38S2-23-0","canonicalUrl":"https://icboms.com/microchip/KVX38S2-23-0","factsUrl":"https://icboms.com/api/mcp/products/KVX38S2-23-0","rawCanonicalId":null},"summary":{"shortDescription":"KVX38S2-23-0, single silicon varactor diode, 32pF capacitance at 3V, Q 200 at 4V/50MHz, 27V peak reverse, SOT-23-3 package, -55°C to 125°C, active lifecycle.","salesMarkdown":"The KVX38S2-23-0 is a single silicon varactor (tuning) diode in a SOT-23-3 surface-mount package. It is designed for voltage-controlled tuning in RF circuits — VCOs, phase-locked loops, and filter banks — where a variable capacitance controlled by a DC bias voltage is needed. The key parameters that define its tuning range are the 32 pF capacitance at 3 V and the 27 V peak reverse voltage, which together set the capacitance swing available for the application. ## 32 pF at 3 V — the tuning capacitance that sets the frequency range At a reverse bias of 3 V and a test frequency of 1 MHz, the KVX38S2-23-0 measures 32 pF. This is the capacitance value you use when calculating the resonant frequency of the LC tank in a VCO or the cutoff in a tunable filter. The 27 V peak reverse rating tells you the maximum bias voltage you can apply, which determines how far the capacitance can be reduced (typically to a few picofarads at high bias). For a design targeting a specific frequency band, the 32 pF at 3 V is the starting point for the tuning curve. A Q (quality factor) of 200 at 4 V reverse bias and 50 MHz tells you the varactor has low series resistance and will not heavily damp the resonator. In a VCO tank circuit, a Q of 200 keeps the phase noise low and the oscillator stable. If the Q were significantly lower, the tank would lose energy each cycle, widening the oscillator's spectral line. For a 50 MHz IF filter or a VCO in that range, this Q is adequate for most commercial and industrial designs. ## Temperature range and package — built for harsh environments The SOT-23-3 package (also known as TO-236-3 or SC-59) is a standard three-lead surface-mount footprint that reflows easily and fits compact RF layouts. The device is ROHS3 compliant. For a BOM line, this removes the supply risk of an obsolete part.","metaTitle":"KVX38S2-23-0 Varactor Diode, 32pF at 3V, SOT-23-3","metaDescription":"KVX38S2-23-0 single silicon varactor diode, 32pF at 3V, Q 200 at 4V/50MHz, 27V peak reverse. Active, ROHS3, SOT-23-3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"Package":"Bulk","Q @ Vr, F":"200 @ 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":"$6.14","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$6.14000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/921ee0eff5f56dfc0cc916dfbcda2b2d.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the capacitance of KVX38S2-23-0 at 3V?","answer":"At a reverse bias of 3 V and a test frequency of 1 MHz, the capacitance is 32 pF."},{"question":"What is the Q factor of KVX38S2-23-0?","answer":"The Q factor is 200 at a reverse bias of 4 V and a test frequency of 50 MHz."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/KVX38S2-23-0","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/KVX38S2-23-0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}