| Picture | ES Part No. | Part No | Stock | Price | Datasheet | Pb Free | RoHS | Description | Vendor | Package / Case | Packaging |
| | | | | | | | | | | |
 | 0035-1443-0 | MCP7940N-I/SN | 3,231 | 52.13 |  | PB-Free | RoHS | Battery-Backed I2C Real Time Clock/Calendar with SRAM 64 Bytes, Vcc = 1.8V to 5.5V | MICROCHIP | SOIC-8 | TUBE |
 | 0126-0181-8 | DS3231SN#T&R | 2,683 | 142.40 | | PB-Free | RoHS | Extremely Accurate I2C Real-Time Clock (RTC), Integrated Temperature-Compensated Crystal Oscillator (TCXO) and Crystal | MAXIM INTEGRATED | SOIC-16 | TAPE & REEL |
| 0067-0090-3 | DS3231SN#-T/R | 0 | 182.50 | | PB-Free | RoHS | RTC Extremely Accurate I2C-Integrate RTC/TCXO/CRYSTAL | DALLAS/MAXIM | SOIC-16 | TAPE & REEL |
 | 0057-0145-3 | RX8900SA:UA3 PURE SN | 0 | 138.30 | | PB-Free | RoHS | Real Time Clock Module, Built-In Frequency Adjusted 32.768kHz Crystal Unit/DTCXO/Backup Switchover Circuit, I2C-Bus Interface | EPSON | SOIC-14 | TAPE & REEL |
 | 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-14 | TUBE |
| 0223-0039-4 | ISL12028IBZ | 1,137 | 63.24 | | PB-Free | | Real Time Clock/Calendar with EEPROM Automatic Backup to Battery or SuperCap | INTERSIL/RENESAS | SOIC-14 | TUBE |
 | 0057-0167-3 | X1B000311000114 | 976 | 31.08 | | PB-Free | RoHS | Real Time Clock Module, RX8130CE, with Auto Power Switching/Backup Battery Charge Control, I2C-Bus | EPSON | SMD-10 | TAPE & REEL |
| 0057-0172-6 | X1B000431000111 | 1,000 | 44.29 | | PB-Free | RoHS | Real Time Clock Module, RX4111CE A, Built-In RAM 8Bit x 64Word(512Bit), Auto Power Switching,8 Time Stamps, Frequency Tolerance ±11.5ppm, SPI-4 Wire | EPSON | SMD-10 | TAPE & REEL |
| 0057-0170-2 | X1B000421000114 | 1,000 | 40.40 | | PB-Free | RoHS | Real Time Clock Module, RX8111CE A, Built-In RAM 8Bit x 64Word(512Bit), Auto Power Switching,8 Time Stamps, Frequency Tolerance ±11.5ppm, I2C-Bus | EPSON | SMD-10 | TAPE & REEL |
| 0057-0169-7 | X1B000371000214 | 1,000 | 56.10 | | PB-Free | RoHS | Real Time Clock Module, RX8804CE XB, Built-In DTCXO, with Internal State Output Function, 1 Time Stamp, Frequency Stability ±8ppm, I2C-Bus | EPSON | SMD-10 | TAPE & REEL |
| 0057-0168-5 | X1B000301000214 | 995 | 50.93 | | PB-Free | RoHS | Real Time Clock Module, RX8900CE UB, Built-In DTCXO,with Auto Power Switching/Temperature Sensor Function, Frequency Stability ±5ppm, I2C-Bus | EPSON | SMD-10 | TAPE & REEL |
 | 0086-0701-4 | NE555P | 22,991 | 8.28 | | PB-Free | RoHS | Precision Timers | TEXAS INSTRUMENTS | PDIP-8 | TUBE |
| 0067-0060-1 | DS1302+ | 320 | 52.26 | | PB-Free | RoHS | Real Time Clock, 31 Bytes RAM, 3-Wire Serial, Trickle Charge Timekeeping Chip, 8PIN DIP (300-mil) | DALLAS/MAXIM | PDIP-8 | TUBE |
 | 0051-0025-7 | HT1382 | 64 | 26.42 | | PB-Free | RoHS | Low Power Real Time Clock and Calendar with EEPROM 4 Bytes, Integrated Oscillator Load Capacitors 12.5pF, I2C Serial Interface. | HOLTEK | PDIP-8 | TUBE |
| 0067-0062-7 | DS1307+ | 0 | 118.20 | | PB-Free | RoHS | 64x8 Serial Real Time Clock, 56 Bytes RAM 2-Wire Serial | DALLAS/MAXIM | PDIP-8 | TUBE |
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