{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"AT21CS01-STUM16-T","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"AT21CS01-STUM16-T","canonicalUrl":"https://icboms.com/microchip/AT21CS01-STUM16-T","factsUrl":"https://icboms.com/api/mcp/products/AT21CS01-STUM16-T","rawCanonicalId":null},"summary":{"shortDescription":"Microchip AT21CS01-STUM16-T, 1Kbit serial EEPROM, Non-Volatile, I²C / Single-Wire interface, 125 kbps clock, 1.7V–3.6V supply, SOT-23-3 package, -40°C to 85°C.","salesMarkdown":"## 1 Kbit EEPROM with dual-interface flexibility The Microchip AT21CS01-STUM16-T is a 1 Kbit serial EEPROM that speaks both I²C and a proprietary Single-Wire protocol, packing 128 x 8 organization into a SOT-23-3 package. ## Dual-protocol bus — I²C and Single-Wire The AT21CS01 supports both I²C and a single-pin Single-Wire interface, letting you share the same part across designs that use either bus. On an I²C bus it behaves as a standard slave; in Single-Wire mode it uses only one GPIO and a ground reference, freeing a pin on a cramped MCU. The 125 kbps clock rate is adequate for configuration reads or periodic sensor-log retrieval — not for streaming, but fine for the 128-byte array it manages. The 1.7 V minimum supply lets it run directly from a Li-ion cell near end-of-discharge without a boost regulator. The 5 ms write cycle is the same for a single byte or a full page — budget that latency in any write-heavy routine.","metaTitle":"Microchip AT21CS01-STUM16-T EEPROM, 1Kbit I²C/Single-Wire","metaDescription":"Microchip AT21CS01-STUM16-T 1Kbit EEPROM with I²C and Single-Wire interface, 125 kbps clock, 1.7V–3.6V supply, -40°C to 85°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Technology":"EEPROM","Memory Size":"1Kbit","Memory Type":"Non-Volatile","Memory Format":"EEPROM","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","Clock Frequency":"125 kbps","lifecycle_stage":"eol_hot","Memory Interface":"I²C, Single Wire","Voltage - Supply":"1.7V ~ 3.6V","Memory Organization":"128 x 8","Operating Temperature":"-40°C ~ 85°C (TC)","Supplier Device Package":"SOT-23-3","Write Cycle Time - Word, Page":"5ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6625","stockQuantity":0,"priceTiers":[{"qty":5000,"price":"$0.66250","currency":"USD"}]},"links":{"datasheetUrl":"https://ww1.microchip.com/downloads/aemDocuments/documents/MPD/ProductDocuments/DataSheets/AT21CS01-AT21CS11-Serial-EEPROM-Unique-ID-Data-DS20005857.pdf","sourceUrl":null},"ai":{"faq":[{"question":"How many bytes does the AT21CS01 store?","answer":"The AT21CS01 stores 1 Kbit organized as 128 x 8 bits, or 128 bytes."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/AT21CS01-STUM16-T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/AT21CS01-STUM16-T 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}}