Product Category Search
Top rated clock integrated circuits
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Best overall
DS3231 AT24C32 Precision RTC Module
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
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Best for makers
Adafruit DS3231 Precision RTC Breakout
Pre-assembled with headers, excellent documentation, and reliable timekeeping.
- Pre-assembled
- Great documentation
- High accuracy
- Slightly more expensive
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Budget pick
DS1307 RTC Module
Low-cost basic RTC with I2C interface, suitable for simple projects.
- Very cheap
- Standard I2C
- Widely available
- Less accurate than DS3231
- No temp compensation
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Best precision
Maxim Integrated DS3231MZ+
Industrial-grade precision RTC with ±2ppm accuracy and wide temperature range.
- High precision
- Wide temp range
- Low power
- SOIC package requires soldering
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Best low power
MCP7940M-I/SN
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
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Best value
DS3231 AT24C32 RTC Module with EEPROM
Combines accurate DS3231 RTC with 32KB EEPROM for data logging projects.
- RTC+EEPROM combo
- Good accuracy
- Low cost
- EEPROM write cycles limited
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Best for I2C
NXP PCF8523T/1,118
Simple I2C RTC with low power consumption and wide voltage range.
- Low cost
- I2C interface
- Wide voltage range
- Lower accuracy
- No temp compensation
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Classic choice
Maxim Integrated DS1307Z+
Industry standard RTC, 56-byte NV RAM, and I2C interface.
- Standard part
- NV RAM included
- Low cost
- Average accuracy
- Requires external crystal