S-35390A-I8T1U

Real Time Clock Overview

The S-35390A-I8T1U is a CMOS 2-wire real-time clock IC manufactured by ABLIC Inc. It operates within a wide voltage range of 1.3 V to 5.5 V and consumes 0.25 µA typ. at 3.0 V. The device features an I²C-bus interface, built-in clock correction, and free user registers for backup memory. It includes auto-calendar functionality up to 2099 with leap year calculation. The package is SNT-8A (I8T1), which is lead-free, Sn 100%, and halogen-free.

Real Time Clock Feature Summary

• Low current consumption: 0.25 µA typ. (VDD = 3.0 V, Ta = +25°C)
• Wide operating voltage range: 1.3 V to 5.5 V
• Built-in clock correction function combined with temperature sensor
• 2-wire (I²C-bus) CPU interface with alarm interrupter

Real Time Clock Applications

• Mobile game devices
• Digital still cameras
• Electronic power meters
• TV and VCR systems

Real Time Clock Procurement Notes

Verify the environmental code 'U' indicates lead-free (Sn 100%) and halogen-free status. Confirm the package type corresponds to SNT-8A (I8T1). Ensure compatibility with the required I²C bus speeds and voltage levels for the target application.

Real Time Clock Selection Notes

Select this component for applications requiring low power consumption in battery-operated systems. The wide voltage range supports both main supply and backup battery operations. Consider the built-in clock correction feature for high precision requirements without external calibration.

Real Time Clock Part Context

The S-35390A series includes variants with different packages such as 8-Pin SOP (JEDEC) and 8-Pin TSSOP. The -I8T1U suffix specifically denotes the SNT-8A package with tape packing and environmental compliance. This part is part of ABLIC's real-time clock portfolio designed for portable electronic devices.

Real Time Clock Replacement Considerations

Direct replacements should match the I²C interface, voltage range, and package type. Verify pinout compatibility if substituting with other RTC ICs. Check if alternative parts support the same clock correction and alarm interrupt features.