{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY8C9540A-24PVXI","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY8C9540A-24PVXI","canonicalUrl":"https://icboms.com/infineon/CY8C9540A-24PVXI","factsUrl":"https://icboms.com/api/mcp/products/CY8C9540A-24PVXI","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies CY8C9540A-24PVXI I2C port expander, 40 I/O, 100 kHz clock, 3V-5.25V supply, 48-BSSOP package, Tube.","salesMarkdown":"## Active production — still a valid BOM line The CY8C9540A-24PVXI: ROHS3 compliance is confirmed, clearing EU and global regulatory requirements without a separate exemption review. ## 40 I/O over a single I2C bus This is a 40-pin I2C port expander that communicates at 100 kHz — the bus clock sets the throughput ceiling for reading or writing all 40 I/O lines in a single transaction cycle. Each I/O can sink 25 mA or source 10 mA, enough to drive indicator LEDs, optocoupler inputs, or small signal relays without external buffer transistors on every channel. Outputs are open-drain, so the expander can wire-OR multiple interrupt lines on the same bus node — useful in a multi-sensor panel where any device can flag the host. ## On-chip blocks that save board space Integrated EEPROM stores configuration and pin states across power cycles, eliminating an external serial EEPROM for non-volatile settings. The built-in POR (power-on reset) and WDT (watchdog timer) mean the expander self-resets on brownout and can monitor host health without a separate supervisor IC. PWM outputs on selected pins allow direct LED dimming or buzzer tone generation — no dedicated PWM controller needed for simple indicator loads. Shipped in Tube format, so prototype and low-volume builds get the parts in a rigid carrier without reel fees.","metaTitle":"CY8C9540A-24PVXI I2C Port Expander, 40 I/O, 48-SSOP, Active","metaDescription":"Infineon CY8C9540A-24PVXI I2C port expander with 40 I/O, 100 kHz clock, 3-5.25V supply. Active production, ROHS3 compliant. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Memory (DRAM / SRAM / Flash / EEPROM)"],"specifications":{"Package":"Tube","Features":"EEPROM, POR, PWM, WDT","Interface":"I²C","Output Type":"Open Drain","Mounting Type":"Surface Mount","Number of I/O":"40","Package / Case":"48-BSSOP (0.295\\\", 7.50mm Width)","Clock Frequency":"100 kHz","lifecycle_stage":"eol_hot","Interrupt Output":"Yes","Voltage - Supply":"3V ~ 5.25V","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"48-SSOP","Current - Output Source/Sink":"10mA, 25mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$10.8","stockQuantity":19,"priceTiers":[{"qty":1,"price":"$10.80000","currency":"USD"},{"qty":10,"price":"$9.92200","currency":"USD"},{"qty":25,"price":"$9.51080","currency":"USD"},{"qty":100,"price":"$8.37970","currency":"USD"},{"qty":250,"price":"$7.96840","currency":"USD"},{"qty":500,"price":"$7.45430","currency":"USD"},{"qty":1000,"price":"$6.83740","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/b2c3a9c82d2ffb2e7807e5f4897818a8.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY8C9540A-24PVXI","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY8C9540A-24PVXI 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}}