{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCA2129T/Q900/2,51","brand":"NXP Semiconductors","brandSlug":"nxp","productSlug":"PCA2129T-Q900-2~651","canonicalUrl":"https://icboms.com/nxp/PCA2129T-Q900-2~651","factsUrl":"https://icboms.com/api/mcp/products/PCA2129T%2FQ900%2F2%2C51","rawCanonicalId":null},"summary":{"shortDescription":"NXP PCA2129T/Q900/2,51 Clock/Calendar RTC, I2C interface, integrated TCXO/crystal, 1.8V–4.2V supply, -40°C to 85°C, 16-SOIC package.","salesMarkdown":"## Real-time clock with integrated TCXO — no external crystal needed The NXP PCA2129T/Q900/2,51 is an I2C real-time clock (RTC) that integrates a temperature-compensated crystal oscillator (TCXO) and crystal on-chip, so you can drop it onto a 16-SOIC footprint without sourcing a separate 32.768 kHz resonator. It keeps time in HH:MM:SS (12/24 hr) and YY-MM-DD-dd formats, with alarm, leap-year compensation, square-wave output, and a watchdog timer built in. The supply range spans 1.8 V to 4.2 V for both the main VDD and the battery backup input, so it runs off a 3.0 V or 3.6 V coin cell as easily as a 3.3 V logic rail. Timekeeping current is a maximum of 1.5 µA at 3.3 V — low enough to keep the calendar alive for years on a CR2032.","metaTitle":"NXP PCA2129T/Q900/2,51 RTC Clock/Calendar, I2C, 1.5µA","metaDescription":"NXP PCA2129T/Q900/2,51 I2C real-time clock with integrated TCXO/crystal, 1.5µA timekeeping at 3.3V, industrial temp range.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Type":"Clock/Calendar","Package":"Tape & Reel (TR); Cut Tape (CT)","Features":"Alarm, Leap Year, Square Wave Output, TCXO/Crystal, Watchdog Timer","Interface":"I2C, 2-Wire Serial","Date Format":"YY-MM-DD-dd","Time Format":"HH:MM:SS (12/24 hr)","Mounting Type":"Surface Mount","Package / Case":"16-SOIC (0.295\\\", 7.50mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"1.8V ~ 4.2V","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"16-SO","Voltage - Supply, Battery":"1.8V ~ 4.2V","Current - Timekeeping (Max)":"1.5µA @ 3.3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.39","priceTiers":[{"qty":1,"price":"$6.39000","currency":"USD"},{"qty":10,"price":"$5.74200","currency":"USD"},{"qty":25,"price":"$5.42800","currency":"USD"},{"qty":100,"price":"$4.70430","currency":"USD"},{"qty":250,"price":"$4.46308","currency":"USD"},{"qty":500,"price":"$4.00472","currency":"USD"},{"qty":1000,"price":"$3.37748","currency":"USD"},{"qty":2000,"price":"$3.20861","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/9f2f7656a1360edc6db49765c1375f0e.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/PCA2129T%2FQ900%2F2%2C51/alternatives.json"},"ai":{"faq":[{"question":"Does PCA2129T/Q900/2,51 have an internal crystal or need an external one?","answer":"It integrates a TCXO and crystal on-chip, so no external 32.768 kHz resonator is needed. The square-wave output and alarm functions are available without adding a crystal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/nxp/PCA2129T-Q900-2~651","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/nxp/PCA2129T-Q900-2~651 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}}