{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"DS1390U-33+","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"DS1390U-33","canonicalUrl":"https://icboms.com/analog-devices/DS1390U-33","factsUrl":"https://icboms.com/api/mcp/products/DS1390U-33%2B","rawCanonicalId":null},"summary":{"shortDescription":"Maxim Integrated DS1390U-33+, SPI Real-Time Clock/Calendar, 10-uMAX/uSOP, 2.97V–5.5V supply, -40°C to 85°C, alarm, trickle-charger, square-wave output.","salesMarkdown":"## SPI RTC with battery backup and trickle-charger The Maxim Integrated DS1390U-33+ is a SPI-bus real-time clock/calendar in a 10-pin uMAX/uSOP surface-mount package. It tracks time in HH:MM:SS:hh (12/24 hr) and date in YY-MM-DD-dd format, with an integrated alarm, square-wave output, and a trickle-charger for backup battery maintenance. Rated for -40°C to 85°C operation, this part fits industrial control, outdoor telecom, and factory-automation panels where the RTC must keep time through power loss and temperature swings. ## Lifecycle and compliance It is ROHS3 compliant.","metaTitle":"DS1390U-33+ Real Time Clock, SPI, Industrial Temp, 10-uMAX","metaDescription":"Maxim DS1390U-33+ SPI RTC: Clock/Calendar, alarm, trickle-charger, 2.97V–5.5V supply, -40°C to 85°C. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Type":"Clock/Calendar","Package":"Tube","Features":"Alarm, Leap Year, Square Wave Output, Trickle-Charger","Interface":"SPI","Date Format":"YY-MM-DD-dd","Time Format":"HH:MM:SS:hh (12/24 hr)","Mounting Type":"Surface Mount","Package / Case":"10-TFSOP, 10-MSOP (0.118\\\", 3.00mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"2.97V ~ 5.5V","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"10-uMAX/uSOP","Voltage - Supply, Battery":"1.3V ~ 5.5V","Current - Timekeeping (Max)":"175µA @ 2.97V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.15","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$5.15000","currency":"USD"},{"qty":10,"price":"$4.62100","currency":"USD"},{"qty":25,"price":"$4.36880","currency":"USD"},{"qty":100,"price":"$3.78630","currency":"USD"},{"qty":250,"price":"$3.59216","currency":"USD"},{"qty":500,"price":"$3.22322","currency":"USD"},{"qty":1000,"price":"$2.71839","currency":"USD"},{"qty":2500,"price":"$2.58247","currency":"USD"}]},"links":{"datasheetUrl":"https://www.analog.com/media/en/technical-documentation/data-sheets/DS1390-DS1394.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What SPI modes does the DS1390U-33+ support?","answer":"The DS1390U-33+ uses an SPI interface. The datasheet details the supported modes and timing; typical SPI RTCs from Maxim operate in mode 0 or mode 3. Verify the exact mode against the timing diagram for your MCU's SPI peripheral."},{"question":"Is DS1390U-33+ a drop-in replacement for DS1390U-33?","answer":"The DS1390U-33+ is the ROHS3-compliant version of the DS1390U-33. Pinout and footprint are identical; the only difference is the lead-free finish. It is a drop-in replacement for existing designs using the non-RoHS variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/DS1390U-33","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/DS1390U-33 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}}