RX-8025SA:AA3

Real Time Clock Overview

The RX-8025SA:AA3 is a Real-Time Clock (RTC) IC manufactured by Epson Timing, designed for precise timekeeping in electronic systems. It features an integrated 32.768 kHz crystal unit with factory-adjusted frequency accuracy of ±5 ppm at +25°C. The device communicates via a standard I2C bus interface operating up to 400 kHz. It supports a wide supply voltage range from 1.7 V to 5.5 V and maintains timing functionality down to 1.15 V during backup modes. Packaged in a 14-SOP format, it operates within a temperature range of -40°C to +85°C.

Real Time Clock Feature Summary

• Integrated 32.768 kHz quartz oscillator with high precision adjustment (±5×10⁻⁶/Ta=+25°C).
• I2C bus interface supporting 400 kHz clock speed for efficient data communication.
• Wide operating voltage range of 1.7 V to 5.5 V with low standby current (typ. 0.48 µA at 3 V).
• Comprehensive detection functions including power voltage monitoring, oscillation stop detection, and power-on reset detection.

Real Time Clock Applications

• Smart meters and utility billing equipment requiring long-term accurate timekeeping.
• Industrial control systems needing reliable calendar and alarm functions.
• Consumer electronics utilizing surface-mount technology for compact designs.

Real Time Clock Procurement Notes

Verify the specific suffix AA3 against official Epson documentation to confirm pinout and electrical characteristics match the design requirements. Ensure compatibility with the target I2C bus voltage levels. Check RoHS compliance status through the manufacturer's datasheet before finalizing procurement specifications.

Real Time Clock Selection Notes

Select this component when a SOP-14 package is required for easier handling compared to smaller footprints. Choose RX-8025SA:AA3 over temperature-compensated variants like RX-8025T if cost optimization is prioritized and the application environment remains within the specified industrial temperature range without extreme fluctuations.

Real Time Clock Part Context

This part belongs to the RX-8025SA series, which utilizes the classic SOP-14 large package (10.1mm x 7.4mm). This packaging style is distinct from the smaller SJ or CE packages found in other Epson RTC lines, making it suitable for applications where soldering reliability and manual assembly ease are significant factors.

Real Time Clock Replacement Considerations

Direct pin-compatible alternatives within the same family include RX-8025SA:AA0. For applications requiring higher precision across wider temperature ranges, consider upgrading to the RX-8025T series, though package differences must be accounted for.