BUY M4T28-BR12SH1 https://www.utsource.net/itm/p/11614695.html
SNAPHAT BATT/CRYSTAL FOR SOIC
Description: The M4T28-BR12SH1 is a 4-pin DIP (Dual In-line Package) type non-volatile memory (NVM) device manufactured by STMicroelectronics. It is a low-voltage, low-power, serial EEPROM (Electrically Erasable Programmable Read-Only Memory) device. Features: Low voltage operation: 1.8V to 5.5V Low power consumption High speed operation: up to 1MHz Serial interface High reliability Endurance: 100,000 write cycles Data retention: up to 100 years Operating temperature range: -40°C to +85°C Applications: Automotive Industrial Consumer Medical Networking Security Automation (For reference only)