{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"DS1685E-3+","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"DS1685E-3","canonicalUrl":"https://icboms.com/analog-devices/DS1685E-3","factsUrl":"https://icboms.com/api/mcp/products/DS1685E-3%2B","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices DS1685E-3+ Clock/Calendar RTC, Parallel Interface, 242B NVSRAM, Alarm, Y2K, 2.7V-3.7V, 24-TSSOP, Tube.","salesMarkdown":"## 242B NVSRAM and timekeeping at 2 mA The DS1685E-3+ is a parallel-interface real-time clock from Analog Devices that combines a full calendar (YY-MM-DD-dd) and 12/24-hour timekeeping with 242 bytes of NVSRAM, an alarm comparator, and a programmable square-wave output — all in a 24-TSSOP package. The timekeeping current draw is 2 mA max at 3 V, so the battery-backed supply (2.5 V to 3.7 V) carries the RTC through power-loss events without draining a coin cell faster than the application's shelf-life budget. ## Supply rails and temperature grade The main supply range is 2.7 V to 3.7 V, with a separate battery-backup input accepting 2.5 V to 3.7 V — the RTC switches seamlessly to the backup rail when Vcc drops below the trip point, preserving the time and NVSRAM contents. The NVSRAM is not a separate chip — it is the 242-byte static RAM inside the RTC that retains data as long as the backup battery is present. That is enough space for system configuration bytes, calibration constants, or a small event log without adding a serial EEPROM to the BOM. Housed in a 24-TSSOP (4.40 mm width) with a surface-mount footprint, the DS1685E-3+ shares the same 0.65 mm pitch and body size as other 24-TSSOP RTCs in the DS1685 family. The supplier device package is listed as 24-TSSOP — the same as the package/case — so the PCB land pattern is unambiguous. Supplied in tube format, which is typical for prototype and low-volume builds; reel options may be available under a different ordering suffix.","metaTitle":"DS1685E-3+ Clock/Calendar RTC, 2.7V-3.7V, 24-TSSOP","metaDescription":"Analog Devices DS1685E-3+ real-time clock with 242B NVSRAM, parallel interface, alarm, Y2K compliance. Active production, ROHS3. Quoted to order.","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, NVSRAM, Square Wave Output, Y2K","Interface":"Parallel","Date Format":"YY-MM-DD-dd","Memory Size":"242B","Time Format":"HH:MM:SS (12/24 hr)","Mounting Type":"Surface Mount","Package / Case":"24-TSSOP (0.173\\\", 4.40mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"2.7V ~ 3.7V","Operating Temperature":"0°C ~ 70°C","Supplier Device Package":"24-TSSOP","Voltage - Supply, Battery":"2.5V ~ 3.7V","Current - Timekeeping (Max)":"2mA @ 3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$8.41","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$8.41000","currency":"USD"},{"qty":10,"price":"$7.60000","currency":"USD"},{"qty":25,"price":"$7.24680","currency":"USD"},{"qty":100,"price":"$6.29230","currency":"USD"},{"qty":250,"price":"$6.00952","currency":"USD"},{"qty":500,"price":"$5.47924","currency":"USD"},{"qty":1000,"price":"$4.77225","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What compliance documentation does Analog Devices provide for DS1685E-3+?","answer":"The DS1685E-3+ is ROHS3 compliant, which is the strictest ROHS directive (2011/65/EU plus delegated directive 2015/863) with no exemptions. No UL, IEC, or REACH certification is listed in the product record — the ROHS3 status is the only compliance declaration on file."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/DS1685E-3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/DS1685E-3 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}}