{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1338-31DCGI8","brand":"Renesas Electronics","brandSlug":"renesas","productSlug":"1338-31DCGI8","canonicalUrl":"https://icboms.com/renesas/1338-31DCGI8","factsUrl":"https://icboms.com/api/mcp/products/1338-31DCGI8","rawCanonicalId":null},"summary":{"shortDescription":"Renesas 1338-31DCGI8 Clock/Calendar RTC, I²C 2-Wire Serial, 56B NVSRAM, Leap Year, Square Wave Output, 3.3V~5.5V supply, -40°C~85°C, 8-SOIC.","salesMarkdown":"## What this RTC brings to the board The Renesas 1338-31DCGI8 is an I²C-interface real-time clock and calendar IC that tracks time in HH:MM:SS (12/24-hour) and date in YY-MM-DD-dd format, with a 56-byte NVSRAM for user data that survives power loss. Its 3.3 V to 5.5 V supply range and 5 µA timekeeping current (max) at 3.63 V to 5.5 V make it a fit for both 3.3 V and 5 V logic rails, and the 1.3 V to 3.7 V battery-backup input keeps the clock running when main power drops. The integrated square-wave output can drive a microcontroller interrupt or a simple LED heartbeat without an external oscillator buffer. ## Temperature grade and environment Rated for -40°C to 85°C operation, the 1338-31DCGI8 handles outdoor telecom cabinets, factory-floor controllers, and engine-bay data loggers where the ambient can swing well past commercial limits. The 8-SOIC package (0.154\" body, 3.90 mm width) is a standard footprint for surface-mount assembly and rework, and the industrial temperature range means no derating headache when the cabinet fan fails. ## Sourcing and lifecycle No direct replacement or second-source alternate is recorded, so dual-sourcing requires a separate qualification of a functionally equivalent RTC.","metaTitle":"1338-31DCGI8 RTC Clock/Calendar I2C 8-SOIC, Active","metaDescription":"1338-31DCGI8 RTC with I2C interface, 56B NVSRAM, 3.3V-5.5V supply, 5µA timekeeping current. Industrial temp -40°C to 85°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Type":"Clock/Calendar","Package":"Tape & Reel (TR); Cut Tape (CT)","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-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"3.3V ~ 5.5V","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"8-SOIC","Voltage - Supply, Battery":"1.3V ~ 3.7V","Current - Timekeeping (Max)":"5µA @ 3.63V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.88","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$3.88000","currency":"USD"},{"qty":10,"price":"$3.48600","currency":"USD"},{"qty":25,"price":"$3.29520","currency":"USD"},{"qty":100,"price":"$2.85580","currency":"USD"},{"qty":250,"price":"$2.70932","currency":"USD"},{"qty":500,"price":"$2.43108","currency":"USD"},{"qty":1000,"price":"$2.05030","currency":"USD"},{"qty":3000,"price":"$1.94779","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/5a685648ac8a79e9ac640325a5fcc855.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does 1338-31DCGI8 have battery backup?","answer":"Yes, it includes a dedicated battery-backup supply pin (1.3 V to 3.7 V) that keeps the clock running and the 56-byte NVSRAM contents intact during main power loss."},{"question":"What is the timekeeping current of 1338-31DCGI8?","answer":"The maximum timekeeping current is 5 µA at a supply of 3.63 V to 5.5 V, making it suitable for battery-backed applications where low standby draw matters."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/renesas/1338-31DCGI8","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/renesas/1338-31DCGI8 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-13T23:23:13.175Z","lastPublished":"2026-07-13T23:23:13.175Z","indexable":true}}