{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"DS1308U-33+","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"DS1308U-33","canonicalUrl":"https://icboms.com/analog-devices/DS1308U-33","factsUrl":"https://icboms.com/api/mcp/products/DS1308U-33%2B","rawCanonicalId":null},"summary":{"shortDescription":"Maxim Integrated DS1308U-33+, Clock/Calendar RTC, I²C/2-Wire Serial, 56B NVSRAM, 3V to 5.5V supply, -40°C to 85°C, 8-uMAX/uSOP package.","salesMarkdown":"## What this RTC brings to the board The Maxim Integrated DS1308U-33+ is a serial real-time clock that tracks time in HH:MM:SS (12/24 hr) and date in YY-MM-DD-dd format, with leap-year compensation built in. It communicates over an I²C (2-wire) serial interface, making it a straightforward add-on for any microcontroller with an I²C port. The part includes 56 bytes of NVSRAM for storing configuration or calibration data, and a programmable square-wave output that can serve as a system tick or alarm indicator. The supply range spans 3V to 5.5V on the main rail, so it works equally well in 3.3V or 5V logic systems without a level shifter. A separate battery-backup input accepts 1.3V to 5.5V, allowing a coin cell or supercapacitor to keep the clock running during main power loss. Timekeeping current draws between 125µA and 200µA at 3V to 5.5V — modest enough for battery-backed designs, though not the ultra-low-power tier of dedicated RTCs with sub-µA sleep modes. The operating temperature range of -40°C to 85°C qualifies it for industrial environments: outdoor telecom cabinets, factory-floor controllers, HVAC systems, and automotive cabin applications. The 8-uMAX/uSOP package (3mm body width) fits tight layouts and is rework-friendly under hot air — the exposed pad is small, so a standard 260°C profile lifts the part cleanly without cooking adjacent components. ## Package and mounting The DS1308U-33+ comes in an 8-uMAX/uSOP (also known as 8-MSOP with 0.118\" / 3.00mm width). It is a surface-mount part, and the small body means low thermal mass — a hot-air station at 300°C to 320°C with moderate airflow will reflow the solder in about 5 seconds. ## Lifecycle and sourcing posture The DS1308U-33+ is listed as Active (current production) and ROHS3 compliant.","metaTitle":"DS1308U-33+ RTC Clock/Calendar I2C 8-uMAX, -40°C to 85°C","metaDescription":"Maxim DS1308U-33+ real-time clock with I2C interface, 56B NVSRAM, square wave output. Industrial temp range -40°C to 85°C. Active, ROHS3.","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":"Leap Year, NVSRAM, Square Wave Output","Interface":"I²C, 2-Wire Serial","Date Format":"YY-MM-DD-dd","Memory Size":"56B","Time Format":"HH:MM:SS (12/24 hr)","Mounting Type":"Surface Mount","Package / Case":"8-TSSOP, 8-MSOP (0.118\\\", 3.00mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"3V ~ 5.5V","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"8-uMAX/uSOP","Voltage - Supply, Battery":"1.3V ~ 5.5V","Current - Timekeeping (Max)":"125µA ~ 200µA @ 3V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.46","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$5.46000","currency":"USD"},{"qty":10,"price":"$4.90400","currency":"USD"},{"qty":25,"price":"$4.63600","currency":"USD"},{"qty":100,"price":"$4.01780","currency":"USD"},{"qty":250,"price":"$3.81176","currency":"USD"},{"qty":500,"price":"$3.42026","currency":"USD"},{"qty":1000,"price":"$2.88456","currency":"USD"},{"qty":2500,"price":"$2.74033","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/82ade77f112c11cc79b8093a9c750bc1.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can DS1308U-33+ replace DS1307?","answer":"The DS1308U-33+ is a newer, pin-compatible upgrade to the DS1307 in many designs, offering the same I²C interface and 56-byte NVSRAM, but with a wider supply range (3V to 5.5V vs 5V only) and a smaller 8-uMAX package option. Verify the footprint matches your layout: the DS1307 typically comes in 8-DIP or 8-SOIC, while the DS1308U-33+ is in 8-uMAX/uSOP (3mm width). If your board uses a 3.3V rail, the DS1308U-33+ is a direct drop-in after adjusting the footprint."},{"question":"What is the timekeeping current of DS1308U-33+?","answer":"Timekeeping current is 125µA to 200µA maximum over the full supply range of 3V to 5.5V."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/DS1308U-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/DS1308U-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}}