{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"34AA04-I/ST","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"34AA04-I-ST","canonicalUrl":"https://icboms.com/microchip/34AA04-I-ST","factsUrl":"https://icboms.com/api/mcp/products/34AA04-I%2FST","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 34AA04-I/ST serial EEPROM, 4Kbit, I²C interface, 1 MHz clock, 350 ns access, 8-TSSOP package, Tube.","salesMarkdown":"## Active 4Kbit I²C EEPROM — BOM-fit for low-voltage serial storage The 34AA04-I/ST is a 4Kbit serial EEPROM from Microchip Technology, organized as 256 x 8 x 2 banks, communicating over an I²C bus at up to 1 MHz. ## 350 ns access, 5 ms page write — timing for the firmware engineer Read access time is 350 ns — the time from the I²C address byte ACK to the first data bit appearing on SDA. At a 1 MHz bus clock, each bit takes 1 µs, so the access time adds less than one clock cycle of latency. The write cycle time for a page or word is 5 ms — budget this into the firmware write routine; polling the ACK after each write command avoids bus hangs. The part retains data across this band without read-disturb issues common in flash, making it suitable for calibration constants or boot parameters that must survive a cold start. ## 8-TSSOP footprint — layout and supply routing The 34AA04-I/ST comes in an 8-TSSOP package — 0.65 mm pitch, 4.4 mm body width, 3.0 mm body length. The surface-mount footprint is standard for this package family; the narrow pitch keeps board area under 15 mm². Supply decoupling: a 100 nF ceramic cap within 5 mm of pins 4 (VSS) and 8 (VCC) is sufficient given the 1.7V–3.6V range and typical active current under 1 mA. The I²C bus lines (SCL, SDA) are open-drain — pull-up resistors to VCC are required. At 1 MHz bus speed, the RC time constant of the pull-up and bus capacitance limits the maximum trace length; keep the total bus capacitance below 400 pF per the I²C specification for fast mode. ## Second-source cross-reference — AT24C08D-SSHM-B The AT24C08D-SSHM-B is a functional second-source candidate — same I²C interface, same 1 MHz clock, same 8-TSSOP package, same 1.7V supply minimum, and same industrial temperature range. The key difference: the AT24C08D is 8Kbit (double the density) organized as 1K x 8, while the 34AA04 is 4Kbit organized as 256 x 8 x 2. If your BOM uses only the lower 4Kbit address space and the upper address bits are don't-cares, the AT24C08D can drop in without a firmware change — the I²C device address is set by the A0/A1/A2 pins, which are pin-compatible.","metaTitle":"Microchip 34AA04-I/ST 4Kbit I2C EEPROM, 1 MHz, 8-TSSOP","metaDescription":"Active-production 4Kbit I2C EEPROM, 1 MHz clock, 350 ns access, -40 to 85°C, 8-TSSOP. 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","Access Time":"350 ns","Memory Size":"4Kbit","Memory Type":"Non-Volatile","Memory Format":"EEPROM","Mounting Type":"Surface Mount","Package / Case":"8-TSSOP (0.173\\\", 4.40mm Width)","Clock Frequency":"1 MHz","lifecycle_stage":"eol_hot","Memory Interface":"I²C","Voltage - Supply":"1.7V ~ 3.6V","Memory Organization":"256 x 8 x 2","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"8-TSSOP","Write Cycle Time - Word, Page":"5ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.41","stockQuantity":31,"priceTiers":[{"qty":1,"price":"$0.41000","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional second-source for the 34AA04-I/ST?","answer":"The AT24C08D-SSHM-B is a close functional match — same I²C interface, 1 MHz clock, 8-TSSOP package, 1.7V supply, and -40°C to 85°C range. It offers 8Kbit (double the density) organized as 1K x 8. Pin-compatible for the same footprint; firmware may need adjustment if the upper address space or device ID differs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/34AA04-I-ST","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/34AA04-I-ST 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}}