RTC-4543SB:B3 ROHS

Real Time Clock Overview

The EPSON RTC-4543SB:B3 ROHS is a serial interface real-time clock module housed in an 18-SOP package. It supports a supply voltage range of 2.5V to 5.5V and operates within a temperature range of -40°C to 85°C. The device features a 3-wire serial interface, consumes 1µA to 3µA current, and maintains accuracy within +/-23 PPM. It displays time in HH:MM:SS (24-hour) format and date as YY-MM-DD-dd, including leap year correction.

Real Time Clock Feature Summary

• Integrates a built-in 32.768kHz crystal unit for stable oscillation without external components.
• Supports simple 3-wire serial communication for efficient data transfer with microcontrollers.
• Provides automatic calendar calculations including leap year adjustments for accurate date tracking.

Real Time Clock Applications

• Industrial control systems requiring precise timekeeping
• Consumer electronics with embedded clock functions
• Data logging devices needing timestamp accuracy

Real Time Clock Procurement Notes

Verify component authenticity through authorized distributors due to end-of-life status. Confirm RoHS compliance matches specific regional regulations. Check replacement availability from the manufacturer's official substitution list. Ensure storage conditions adhere to moisture sensitivity level 1 guidelines. Validate pin compatibility before integrating into existing PCB layouts.

Real Time Clock Selection Notes

Choose this module when space constraints require a compact 18-pin SOP footprint. Select for applications needing low power consumption under 3µA. Consider for designs utilizing standard 3-wire serial protocols. Opt for this part if operating temperatures reach -40°C. Evaluate suitability for systems requiring integrated crystal functionality.

Real Time Clock Part Context

This component belongs to Epson’s RTC-4543 series of real-time clock modules. The SB suffix indicates the thin 18-pin SOP package variant. The B3 designation specifies the lead-free plating option compliant with RoHS standards. This series offers simplified integration compared to discrete RTC solutions.

Real Time Clock Replacement Considerations

Official substitute part number: FC-135 32.7680KA-A5 by EPSON. Verify pinout compatibility before substitution. Confirm electrical specifications match original requirements. Check package dimensions for mechanical fit. Review datasheet differences for functional variations.