{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"11LC040-I/P","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"11LC040-I-P","canonicalUrl":"https://icboms.com/microchip/11LC040-I-P","factsUrl":"https://icboms.com/api/mcp/products/11LC040-I%2FP","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 11LC040-I/P EEPROM, 4Kbit, Single Wire Interface, 2.5V-5.5V, -40°C to 85°C, 8-DIP (0.300\", 7.62mm), Tube.","salesMarkdown":"## 4Kbit EEPROM with a single-wire bus — what that means for pin-constrained designs The Microchip 11LC040-I/P is a 4Kbit serial EEPROM organized as 512 x 8 bits, communicating over a single-wire interface that requires only one I/O pin on the host controller plus power and ground. For a through-hole design where every GPIO on a legacy MCU is already allocated, this frees up a port pin compared to a two-wire I²C or three-wire SPI part. ## Single-wire protocol — bus timing and host-side overhead The single-wire interface runs at 100 kHz clock frequency. The host manages the bus timing in firmware — a bit-banged GPIO routine or a dedicated UNI/O® peripheral handles the start condition, device addressing, and data transfer. Because the bus is half-duplex and the host generates the clock, the firmware overhead is higher than a hardware I²C peripheral. For applications that write infrequently — calibration constants, serial numbers, or configuration tables — the 5 ms write latency is acceptable. For high-speed data logging, a SPI EEPROM would be a better fit. ## Through-hole 8-DIP — breadboard, socket, or soldered The 8-DIP (0.300\", 7.62mm) package with through-hole mounting makes the 11LC040-I/P breadboard-friendly during prototyping and field-serviceable when socketed. The tube packaging delivers the parts in a rigid anti-static carrier — suitable for manual assembly or low-volume pick-and-place with a DIP feeder. No reel or tape packaging is available for this variant. ## Active lifecycle and compliance documentation For compliance documentation, Microchip provides the standard datasheet, ROHS certificate of compliance, and material declaration. No UL, IEC, or AEC-Q qualification is listed for this part — it is a commercial/industrial-grade EEPROM, not automotive-qualified.","metaTitle":"Microchip 11LC040-I/P EEPROM, 4Kbit, Single Wire, 8-DIP","metaDescription":"Microchip 11LC040-I/P 4Kbit EEPROM, single-wire interface, 2.5V-5.5V supply, -40°C to 85°C, 8-DIP package. Active lifecycle, ROHS3 compliant. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tube","Technology":"EEPROM","Memory Size":"4Kbit","Memory Type":"Non-Volatile","Memory Format":"EEPROM","Mounting Type":"Through Hole","Package / Case":"8-DIP (0.300\\\", 7.62mm)","Clock Frequency":"100 kHz","lifecycle_stage":"eol_hot","Memory Interface":"Single Wire","Voltage - Supply":"2.5V ~ 5.5V","Memory Organization":"512 x 8","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"8-PDIP","Write Cycle Time - Word, Page":"5ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.39","priceTiers":[{"qty":1,"price":"$0.39000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/7e0bb80ac6f9ae234873f64c6baf4f4d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/11LC040-I%2FP/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to the 11LC040-I/P?","answer":"The AT24C08D-PUM from Microchip is a 8Kbit I²C EEPROM in the same 8-DIP package. However, it uses a two-wire I²C interface, not the single-wire UNI/O® protocol of the 11LC040-I/P. The pinout and bus protocol are different — the 11LC040-I/P cannot drop into a board designed for the AT24C08D-PUM without a firmware rewrite and a pin reassignment."},{"question":"What compliance documentation does Microchip provide for the 11LC040-I/P?","answer":"Microchip provides a ROHS3 compliance certificate and a material declaration for the 11LC040-I/P. No UL, IEC, or AEC-Q automotive qualification is listed. The standard datasheet covers electrical characteristics, timing diagrams, and application notes for the single-wire interface."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/11LC040-I-P","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/11LC040-I-P 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}}