{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"DS1558W+","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"DS1558W","canonicalUrl":"https://icboms.com/analog-devices/DS1558W","factsUrl":"https://icboms.com/api/mcp/products/DS1558W%2B","rawCanonicalId":null},"summary":{"shortDescription":"Maxim Integrated DS1558W+ Clock/Calendar RTC, Parallel Interface, 48-LQFP, 2.97V to 3.63V supply, -40°C to 85°C, Alarm, Leap Year, Watchdog Timer, Y2K.","salesMarkdown":"## What this RTC brings to a timekeeping design The Maxim Integrated DS1558W+ is a parallel-interface real-time clock/calendar in a 48-LQFP package, handling YY-MM-DD-dd date and HH:MM:SS 24-hour time formats. It runs from a 2.97 V to 3.63 V main supply and draws 2 mA max in timekeeping mode at 3.3 V. On-chip features include a programmable alarm, a watchdog timer, leap-year compensation, and Y2K compliance. The industrial temperature range (-40°C to 85°C) suits it for outdoor telecom, industrial controllers, and panel-mounted equipment where the RTC must keep time through a cold start. ## Active production — no LTB clock ticking No last-time-buy notice or end-of-life bulletin applies. For a BOM line that needs a stable RTC through multiple build cycles, this part does not carry an obsolescence clock — you are not hunting date-code windows or broker lots. ## The 2 mA timekeeping current — what it means for battery life At 2 mA max from a 3.3 V rail, the DS1558W+ sits in the moderate-draw range for a parallel RTC. If the design relies on a coin cell during main-power loss, that 2 mA figure sets the battery-capacity budget. ## Parallel interface — why it matters The parallel interface means the RTC connects directly to a microprocessor bus without serial-protocol overhead — useful in legacy controller designs where the MCU already has a parallel memory interface. The trade-off is more I/O pins consumed versus an I²C or SPI RTC.","metaTitle":"DS1558W+ Real-Time Clock, Parallel Interface, 48-LQFP","metaDescription":"DS1558W+ is an active RTC with parallel interface, alarm, watchdog, Y2K. Industrial temp -40 to 85°C, 2mA timekeeping at 3.3V.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Type":"Clock/Calendar","Package":"Tray","Features":"Alarm, Leap Year, Watchdog Timer, Y2K","Interface":"Parallel","Date Format":"YY-MM-DD-dd","Time Format":"HH:MM:SS (24 hr)","Mounting Type":"Surface Mount","Package / Case":"48-LQFP","lifecycle_stage":"eol_hot","Voltage - Supply":"2.97V ~ 3.63V","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"48-LQFP (7x7)","Voltage - Supply, Battery":"2.5V ~ 3.7V","Current - Timekeeping (Max)":"2mA @ 3.3V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$12.41","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$12.41000","currency":"USD"},{"qty":10,"price":"$11.40300","currency":"USD"},{"qty":25,"price":"$10.93080","currency":"USD"},{"qty":80,"price":"$9.63088","currency":"USD"},{"qty":250,"price":"$9.15816","currency":"USD"},{"qty":500,"price":"$8.56732","currency":"USD"},{"qty":1000,"price":"$7.85830","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/8b15bf491ac66d332bdd5e281169aec1.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does DS1558W+ have a watchdog timer?","answer":"Yes, the DS1558W+ includes a watchdog timer as one of its on-chip features, along with an alarm, leap-year compensation, and Y2K compliance."},{"question":"What is the difference between DS1558W+ and DS1558W?","answer":"The DS1558W+ is the ROHS3-compliant version of the DS1558W. The electrical and functional specifications — parallel interface, 48-LQFP package, 2.97V to 3.63V supply, industrial temperature range — are identical. The '+' suffix indicates lead-free / RoHS compliance."},{"question":"What is the closest pin-compatible alternative to DS1558W+?","answer":"Within the same family, the DS1558W (non-RoHS version) is pin-compatible and functionally identical. For a different RTC with similar parallel interface and package, the DS1557W+ or DS1556W+ may be considered, but verify pinout and feature set per the respective datasheets."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/DS1558W","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/DS1558W 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}}