2 × DS3231SN (SOP16) — Extremely accurate I2C realtime clock with integrated TXO and crystal Key benefits Extremely accurate timekeeping: Onboard temperature‑compensated crystal oscillator (TXO/TCXO) and integrated crystal deliver long‑term accuracy without external trimming. Simplifies designs: Integrated oscillator and crystal remove the need for discrete timing components, reducing board area and assembly steps. Easy to integrate: Standard I2C interface makes the device straightforward to connect to common microcontrollers and I2C buses. Compact surfacemount package: SOP16 (SMD) package saves board space and is suitable for mass production and automated assembly. Ready for RTC applications: Use the module where reliable, accurate realtime clock data is required. What this product is Model: DS3231SN Quantity: 2 pieces Package: SOP16 surfacemount package Function: Integrated realtime clock (RTC) with onboard temperature‑compensated oscillator and crystal Interface: I2C for communication with host controllers Why you need it Replaces external crystals and discrete oscillator circuits for a simpler BOM and smaller PCB footprint. Provides consistent timekeeping across temperature changes thanks to the temperature‑compensated oscillator. Ideal when accurate timestamps are critical (data logging, scheduling, event recording) and when you want a reliable hardware RTC that is easy to integrate. Compatibility and performance Communicates over I2C, compatible with most I2Cenabled microcontrollers and singleboard computers. SOP16 surfacemount footprint designed for PCB assembly and production. Integrated crystal and TXO mean fewer external components and more predictable performance over time and temperature. Typical applications / use cases Data loggers and industrial sensors: Provide accurate timestamps for logged measurements without adding extra crystal components. Embedded systems and microcontroller projects: Offload timekeeping from the host MCU for power savings and reliable timekeeping in battery‑backed systems. Consumer electronics and networking devices: Maintain accurate realtime clock for scheduling, alarms, and timed events where stability across temperature is important. Package and handling notes Supplied as two DS3231SN SOP16 ICs for PCB mounting. Intended for surfacemount assembly; handle and solder according to standard SMD practices. Designed to be integrated into systems using an I2C bus; external battery or backup power is typically provided on the host board as required by the application. This product provides a compact, accurate hardware RTC solution (2 pieces) in SOP16 packaging with integrated TXO and crystal for simplified, reliable timekeeping in a wide range of electronic systems.