DS1308U-18+T ISL1208IU8Z-TK RX-8035SA:B PURE SN R M41T93ZMY6E RV-8263-C7-32.768KHZ-20PPM-TA-QA MCP79412T-I/SN RX-8731LC:B0 PURE SN DS1302Z+T&R ISL12022IBZ-T RTC-4574SA:B ROHS MCP7940N-E/MS RX6110SA:BB PURE SN DS1338Z-33+T&R MCP79411T-I/MS AB-RTCMK-32.768KHZ-T RTC-4574SA:B0 ROHS MCP79400-I/MS DS1340Z-33+T&R MCP79411T-I/ST AB-RTCMC-32.768KHZ-EOZ9-S3-DBT