Top rated clock integrated circuits

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AI-generated summary · updated September 10, 2026 · verify details before purchase.

1. 

   1 Best overall DORHEA

   DS3231 AT24C32 Precision RTC Module

   ★★★★★4.6/5 $7.99 Only 13 left

   Highly accurate with temperature compensation, easy to use with Arduino/Raspberry Pi, and includes backup battery.

   • High accuracy
   • I2C interface
   • Includes battery holder

   • Requires soldering for pins

   View on Amazon
2. 2 Best for makers

   Adafruit DS3231 Precision RTC Breakout

   ★★★★★4.8/5 $12-$15

   Pre-assembled with headers, excellent documentation, and reliable timekeeping.

   • Pre-assembled
   • Great documentation
   • High accuracy

   • Slightly more expensive

   View on Amazon manufacturer site
3. 

   3 Budget pick VKLSVAN

   DS1307 RTC Module

   ★★★★☆4.4/5 $5.99 Only 14 left

   Low-cost basic RTC with I2C interface, suitable for simple projects.

   • Very cheap
   • Standard I2C
   • Widely available

   • Less accurate than DS3231
   • No temp compensation

   View on Amazon
4. 

   4 Best precision MAXIM INTEGRATED PRODUCTS

   Maxim Integrated DS3231MZ+

   ★★★★★4.7/5 $4.67

   Industrial-grade precision RTC with ±2ppm accuracy and wide temperature range.

   • High precision
   • Wide temp range
   • Low power

   • SOIC package requires soldering

   View on Amazon manufacturer site
5. 

   5 Best low power Generic

   MCP7940M-I/SN

   ★★★★☆4.3/5 $106.15 Only 5 left

   Ultra-low power RTC with battery backup, I2C interface, and small SOIC package.

   • Very low power
   • Battery backup
   • Small footprint

   • Accuracy ±100ppm
   • Requires external crystal

   View on Amazon manufacturer site
6. 

   6 Best value hiBCTR

   DS3231 AT24C32 RTC Module with EEPROM

   ★★★★☆4.5/5 $20.99

   Combines accurate DS3231 RTC with 32KB EEPROM for data logging projects.

   • RTC+EEPROM combo
   • Good accuracy
   • Low cost

   • EEPROM write cycles limited

   View on Amazon
7. 7 Best for I2C

   NXP PCF8523T/1,118

   ★★★★☆4.2/5 $1-$2

   Simple I2C RTC with low power consumption and wide voltage range.

   • Low cost
   • I2C interface
   • Wide voltage range

   • Lower accuracy
   • No temp compensation

   View on Amazon manufacturer site
8. 

   8 Classic choice X-ON

   Maxim Integrated DS1307Z+

   ★★★★☆4.4/5 $18.40

   Industry standard RTC, 56-byte NV RAM, and I2C interface.

   • Standard part
   • NV RAM included
   • Low cost

   • Average accuracy
   • Requires external crystal

   View on Amazon manufacturer site

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