| Picture | ES Part No. | Part No | Stock | Price | Datasheet | Pb Free | RoHS | Description | Vendor | Case Style | Interface | Memory Size (byte) | Mounting Type | Package / Case | MFR Package | Packaging |
| | | | | | | | | | | | | | | | |
 | 0176-0518-1 | BU9873FJ-GTE2 | 6,539 | 13.92 |  | PB-Free | RoHS | I2C Bus Serial Interface RTC(Real Time Clock) With High-Precision Oscillation Adjustment | ROHM | SOIC | I2C | - | Surface Mount | SOIC-8 | SOP-J8 | TAPE & REEL |
 | 0016-0353-4 | PCF85363ATT1/AJ | 1,482 | 25.51 | | PB-Free | RoHS | Tiny Real-Time Clock/Calendar with 64 Bytes RAM Alarm Function,Battery Switch-Over Time Stamp Input,I2C Bus Interface | NXP/NEXPERIA/WEEN | SOIC | I2C | 64 | Surface Mount | TSSOP-10 | TSSOP-10 | TAPE & REEL |
 | 0035-1674-5 | MCP7940N-I/P | 361 | 46.87 | | PB-Free | RoHS | Battery-Backed I2C Real-Time Clock-Calendar with SRAM 64 Bytes, Automatic Switchover to Battery Backup | MICROCHIP | DIP | I2C | 64 | Through Hole | PDIP-8 | PDIP-8 | TUBE |
 | 0035-1813-8 | MCP7940NT-I/SN | 2,920 | 74.40 | | PB-Free | RoHS | Battery-Backed I2C Real-Time Clock/Calendar(RTCC) with SRAM 64Bytes | MICROCHIP | SOIC | I2C | 64 | Surface Mount | SOIC-8 | SOIC-8 | TAPE & REEL |
| 1522-0207-7 | MCP79411T-I/SN | 1,000 | 53.00 | | PB-Free | RoHS | Battery-Backed I2C Real-Time Clock/Calendar with SRAM 64 Bytes, 1 Kbit EEPROM, Protected EEPROM, with EUI-48 MAC Address | MICROCHIP | SOIC | I2C | 64 | Surface Mount | SOIC-8 | SOIC-8 | TAPE & REEL |
| 0035-1444-3 | MCP79411-I/SN | 176 | 56.36 | | PB-Free | RoHS | Battery-Backed I2C Real-Time Clock/Calendar with SRAM 64 Bytes, 1 Kbit EEPROM, Protected EEPROM, with EUI-48 MAC Address | MICROCHIP | SOIC | I2C | 64 | Surface Mount | SOIC-8 | SOIC-8 | TUBE |
| 0035-1443-0 | MCP7940N-I/SN | 3,316 | 52.13 | | PB-Free | RoHS | Battery-Backed I2C Real Time Clock/Calendar with SRAM 64 Bytes, Vcc = 1.8V to 5.5V | MICROCHIP | SOIC | I2C | 64 | Surface Mount | SOIC-8 | SOIC-8 | TUBE |
 | 0126-0181-8 | DS3231SN#T&R | 3,008 | 138.60 | | PB-Free | RoHS | Extremely Accurate I2C Real-Time Clock (RTC), Integrated Temperature-Compensated Crystal Oscillator (TCXO) and Crystal | MAXIM INTEGRATED | SOIC | I2C | - | Surface Mount | SOIC-16 | SO-16 | TAPE & REEL |
| 0126-0180-6 | DS1302Z+T&R | 2,274 | 35.43 | | PB-Free | RoHS | Trickle-Charge Timekeeping Chip, Real-Time Clock/ Calendar and 31 Bytes of Static RAM, 24-hour or 12-hour Mode, 3-Wire Interface | MAXIM INTEGRATED | SOIC | 3-Wire | 31 | Surface Mount | SOIC-8 | SO-8 | TAPE & REEL |
 | 0223-0039-4 | ISL12028IBZ | 1,137 | 59.82 | | PB-Free | | Real Time Clock/Calendar with EEPROM Automatic Backup to Battery or SuperCap | INTERSIL/RENESAS | SOIC | I2C | 4k | Surface Mount | SOIC-14 | SOIC-14 | TUBE |
| 0223-0037-8 | X1228S14-4.5A | 17 | 66.14 | | PB-Free | | Real Time Clock/Calendar/CPU Supervisor with EEPROM, 512x 8 Bit, I2C Interface Battery Switch or Super Cap Input | INTERSIL/RENESAS | SOIC | 2-Wire(I2C Compatible) | 4k | Surface Mount | SOIC-14 | SOIC-14 | TUBE |
 | 1043-0001-7 | IN1363DT | 2,463 | 17.13 | | PB-Free | RoHS | CMOS LIS Real Time Watch with Calendar,Alarm,Timer I2C Interface, | IK SEMICON | SOIC | I2C | - | Surface Mount | SOP-8 | SOP-8 | TAPE & REEL |
 | 0051-0025-7 | HT1382 | 64 | 24.99 | | PB-Free | RoHS | Low Power Real Time Clock and Calendar with EEPROM 4 Bytes, Integrated Oscillator Load Capacitors 12.5pF, I2C Serial Interface. | HOLTEK | DIP | I2C | 4 | Through Hole | PDIP-8 | DIP-8 | TUBE |
 | 0057-0167-3 | X1B000311000114 | 976 | 30.66 | | PB-Free | RoHS | Real Time Clock Module, RX8130CE, with Auto Power Switching/Backup Battery Charge Control, I2C-Bus | EPSON | SMD | I2C | - | Surface Mount | SMD-10 | SMD-10 | TAPE & REEL |
 | 0057-0166-1 | X1B000242000111 | 993 | 30.66 | | PB-Free | RoHS | Real Time Clock Module, RX8010SJ, Built-In 128Bit User RAM (8Bit x 16, SRAM), Frequency Output Function (C-MOS/Open-Drain Output), I2C-Bus | EPSON | SOIC | I2C | 16 | Surface Mount | SOIC-8 | SOP-8 | TAPE & REEL |
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