RTC-72423B

Real Time Clock Overview

The EPSON RTC-72423B is a surface-mount real-time clock module housed in a 24-pin SOP package. It features a built-in crystal unit for adjustment-free operation and supports both 24-hour and 12-hour formats with automatic Gregorian leap year adjustment. The device operates within a supply voltage range of 4.5 V to 5.5 V, drawing a typical current consumption of 5 µA at 2 V. It provides a 64 Hz output signal and maintains timekeeping via an external battery backup. The component is designed for industrial applications, supporting an operating temperature range from -40 °C to +85 °C.

Real Time Clock Feature Summary

• Built-in crystal unit eliminates the need for external oscillator components.
• Automatic leap year adjustment for the Gregorian calendar.
• Configurable 24-hour or 12-hour time format.
• Low power consumption with typical current draw of 5 µA at 2 V.

Real Time Clock Applications

• Industrial control systems requiring precise timestamping.
• Data logging equipment needing reliable time tracking.
• Embedded monitoring systems operating in variable temperatures.

Real Time Clock Procurement Notes

Verify the specific ordering suffix Q42724232000700 corresponds to the RTC-72423B variant. Confirm that the SOP-24 package dimensions align with the target PCB footprint. Ensure the design accommodates the required 4.5 V to 5.5 V supply voltage range and includes provisions for an external backup battery to maintain data retention during power loss.

Real Time Clock Selection Notes

Select the RTC-72423B over the DIP version when surface mount technology is required. The B suffix indicates a frequency precision of ±50 × 10⁻⁶, which differs from the A suffix's ±20 × 10⁻⁶. Verify compatibility with existing microcontroller interfaces, as the 7242 series is not fully compatible with the older RTC-6242 series without technical review.

Real Time Clock Part Context

This component belongs to the Epson RTC-72421/72423 series of 4-bit real-time clock modules. It serves as the surface-mount equivalent to the through-hole RTC-72421, offering identical functional capabilities in a compact SOP-24 form factor. The series is distinct from the legacy RTC-6242 family and requires specific attention to interface differences during migration.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Note that the RTC-7242 series does not have complete compatibility with the older RTC-6242 series; consult the latest manual before replacing legacy components.