X1226S8Z

Real Time Clock Overview

The X1226S8Z is a Real-Time Clock (RTC) integrated circuit manufactured by Renesas Electronics Corporation. It provides clock/calendar functionality with alarm capabilities and leap year compensation. The device supports I2C, 2-wire serial interface for communication. It operates within a supply voltage range of 2.7V to 5.5V, with battery supply support from 1.8V to 5.5V. Timekeeping current consumption ranges from 10µA to 20µA at 2.7V to 5V. The component is housed in an 8-SOIC package (0.154", 3.90mm width) and is rated for operation between 0°C and 70°C. The product status is listed as obsolete.

Real Time Clock Feature Summary

• Real-time clock/calendar with HH:MM:SS (12/24 hour) and YY-MM-DD-dd formats
• I2C, 2-wire serial interface
• Alarm feature and leap year compensation
• Low power consumption: 10µA ~ 20µa @ 2.7V ~ 5V

Real Time Clock Applications

• General purpose timekeeping in embedded systems
• Data logging applications requiring date/time stamps
• Battery-backed real-time monitoring circuits

Real Time Clock Procurement Notes

The X1226S8Z is classified as obsolete or not recommended for new designs. Verification of availability should focus on existing stock or surplus channels rather than direct manufacturer production. Confirm RoHS compliance status, as related models in the series may have varying environmental certifications. Ensure compatibility with existing PCB footprints if replacing active components.

Real Time Clock Selection Notes

Select this component only for maintenance or legacy system repairs where pinout and software compatibility are critical. Verify that the required operating temperature range (0°C to 70°C) meets application needs, as industrial variants like X1226S8I offer -40°C to 85°C. Check if the I2C address and register map match the existing firmware implementation.

Real Time Clock Part Context

The X1226S8Z belongs to the X1226 family of RTC ICs. It shares core functionality with other variants such as X1226S8I, differing primarily in operating temperature range and packaging suffixes. The base product number is X1226. It is distinct from digital potentiometers (X9C10 series) or microcontrollers (H8S/2600 series) also offered by Renesas.

Real Time Clock Replacement Considerations

ISL12026IBZ-T is identified as a similar replacement part by Renesas. PCA8565TS/1,118 from NXP USA Inc. is another comparable alternative. Verify electrical parameters and pin compatibility before substitution.