{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MAX639CSA+","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"MAX639CSA","canonicalUrl":"https://icboms.com/analog-devices/MAX639CSA","factsUrl":"https://icboms.com/api/mcp/products/MAX639CSA%2B","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices MAX639CSA+ step-down buck regulator, 225 mA output, 4V to 11.5V input range, adjustable (1.3V) or fixed 5V output, 8-SOIC surface-mount package, tube.","salesMarkdown":"The MAX639CSA+ is a step-down (buck) switching regulator from Analog Devices, delivering up to 225 mA from a 4 V to 11.5 V input rail. The output can be set to a fixed 5 V or adjusted down to 1.3 V using an external resistor divider — useful for powering mixed-logic rails from a single unregulated supply. It does not integrate a synchronous rectifier, so the freewheeling diode must be added externally — a Schottky with low forward drop keeps efficiency up at the 225 mA ceiling. ## Operating temperature and package constraints The 8-SOIC (0.154\" wide, 3.90 mm) package is a common footprint that routes easily on a two-layer board with the inductor and output capacitor placed close to the switch node.","metaTitle":"MAX639CSA+ Analog Devices Buck Regulator, 225mA, 8-SOIC","metaDescription":"Analog Devices MAX639CSA+ step-down buck regulator, 225 mA output, 4V to 11.5V input, adjustable/fixed 1.3V/5V output. Active, ROHS3 compliant. 8-SOIC package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Package":"Tube","Function":"Step-Down","Topology":"Buck","Output Type":"Adjustable (Fixed)","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Current - Output":"225mA","Number of Outputs":"1","Output Configuration":"Positive","Operating Temperature":"0°C ~ 70°C (TA)","Synchronous Rectifier":"No","Voltage - Input (Max)":"11.5V","Voltage - Input (Min)":"4V","Voltage - Output (Max)":"11.5V","Supplier Device Package":"8-SOIC","Voltage - Output (Min/Fixed)":"1.3V (5V)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$8.32","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$8.32000","currency":"USD"},{"qty":10,"price":"$7.51300","currency":"USD"},{"qty":25,"price":"$7.16400","currency":"USD"},{"qty":100,"price":"$6.22040","currency":"USD"},{"qty":250,"price":"$5.94080","currency":"USD"},{"qty":500,"price":"$5.41664","currency":"USD"},{"qty":1000,"price":"$4.71771","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/567c182e6cb8d6b2f9c07a9bf0a80671.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What package does the MAX639CSA+ come in?","answer":"It is supplied in an 8-SOIC surface-mount package (0.154\" body width, 3.90 mm) in tube packaging."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/MAX639CSA","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/MAX639CSA when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}