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Product Detailed Parameters
- Description：IC RTC CLK/CALENDAR I2C 20VSOJ
- Series：RX-8581JE
- Package：Tape & Reel (TR)
- Mfr：EPSON
- Type：Clock/Calendar
- Features：Alarm, Leap Year
- Memory Size：-
- Time Format：HH:MM:SS (24 hr)
- Date Format：YY-MM-DD-dd
- Interface：I2C, 2-Wire Serial
- Voltage - Supply：1.8V ~ 5.5V
- Voltage - Supply, Battery：-
- Current - Timekeeping (Max)：0.8µA ~ 1.2µA @ 3V ~ 5V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
- Package / Case：20-LSSOJ (0.213", 5.40mm Width)
- Supplier Device Package：20-VSOJ
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Overview
The EPSON RX-8581JE:B3 is a Real-Time Clock (RTC) IC providing clock and calendar functions via an I2C bus interface. It operates within a supply voltage range of 1.8V to 5.5V, with a maximum current consumption of 0.8µA at 3V and 1.2µA at 5V. The device supports date formats including YY-MM-DD-dd and time formats HH:MM:SS in 24-hour mode. Key features include alarm capabilities and leap year compensation. It is housed in a 20-LSSOJ package (20-VSOJ), measuring 0.213 inches (5.40mm) in width, designed for surface mount installation.
Feature Summary
- I2C-Bus interface for serial communication
- Supply voltage range of 1.8V to 5.5V
- Low power consumption: 0.8µA @ 3V, 1.2µA @ 5V
- Integrated alarm function and leap year compensation
Applications
- General purpose real-time clocking in embedded systems
- Data logging applications requiring accurate time stamps
- Consumer electronics with low power requirements
Procurement Notes
This component is listed as inactive or end-of-life by the manufacturer. Verification of availability should focus on remaining stock from authorized distributors or secondary market sources. Confirm RoHS3 compliance status and check for specific manufacturing date codes if long-term reliability is critical for the application.
Selection Notes
Select this part when an I2C-compatible RTC with a 20-pin VSOJ package is required. Ensure the system voltage falls within the 1.8V to 5.5V operating range. Consider the -40°C to +85°C industrial temperature range suitability. Verify that the 20-LSSOJ footprint matches the PCB design constraints.
Part Context
The RX-8581JE belongs to the Epson RX-8581 series of RTCs. The 'JE' suffix denotes the specific 20-pin VSOJ package variant. This series is distinct from other Epson RTC families such as the RX-8035 or RX-8111, which utilize different packages like VSOJ-12 or smaller SMD forms.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided documentation. Due to the inactive status, direct pin-to-pin replacements from the same family (e.g., RX-8581SA) may require package adaptation.
