Real-Time Clocks
Our broad assortment of tiny, full-featured real-time clocks (RTCs) delivers high accuracy and low power consumption to a variety of end applications.
NXP offers ultra-low-power RTCs that provide low power consumption enabling long battery life with regard to real-time clock functionality, as well as temperature compensated RTCs with integrated crystal CMOS optimized for very high accuracy and low power consumption for industrial applications.
AEC-Q100 Qualified RTCs are designed for highest reliability and lowest power consumption and are available with I²C or SPI bus interfaces. They have an extended operating temperature range of up to 125 °C and AEC-Q100 automotive-compliant qualification.
Find the right product for you
RTC Type
Accuracy (Typ) (+/- ppm)
Supply Voltage [Min to Max] (V)
Low Supply Current (μA)
Communication protocol
Package Dimensions (LxWxZ (mm))
Operating Temperature (Min-Max) (℃)
Automotive RTCs
PCA2131TF
Nano-power highly accurate RTC with integrated quartz crystal for automotive applications
PCA85073A
The PCA85073A is a CMOS1 real-time clock (RTC) and calendar optimized for low-power consumption.
PCA8565
The PCA8565A is a CMOS real-time clock (RTC) and calendar optimized for low-power consumption.
PCA2129
The PCA2129 is a CMOS real-time clock (RTC) and calendar with an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal optimized for very high accuracy and very low-power consumption.
PCA85063A
Automotive tiny real-time clock/calendar with alarm function and I²C-bus.
PCA21125
The PCA21125 is a CMOS real-time clock (RTC) and calendar optimized for low-power consumption and an operating temperature up to 125 °C.
New RTC IC with Dual I²C Interface and Battery Backed-Up SRAM Memory
PCF85053A enhances the server’s architectures with the use of low-power standalone RTC, dual I²C interface and 128 Byte SRAM to interconnect CPU and BMC.
RTCs with SPI
PCF2127
The PCF2127 is a CMOS real-time clock (RTC) and calendar with an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal.
PCF2123
The PCF2123 is a CMOS real-time clock (RTC) and calendar optimized for low-power applications.
PCF2129
The PCF2129 is a CMOS real-time clock (RTC) and calendar with an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal.
NXP Portfolio of RTC IC and RTC Modules: PCF2131TF and PCA2131TF
This video depicts a closer look at NXP’s newest real-time clock (RTC) module additions PCF2131TF and PCA2131TF.
RTCs with Temperature Compensation
PCA2131
The PCA2131 is a CMOS real-time clock (RTC) and calendar with an integrated temperature compensated crystal (Xtal) oscillator (TCXO) and a 32.768 kHz quartz crystal.
PCF2131
The PCF2131 is a CMOS real-time clock (RTC) and calendar with an integrated temperature compensated crystal (Xtal) oscillator (TCXO) and a 32.768 kHz quartz crystal.
PCF2127
The PCF2127 is a CMOS real-time clock (RTC) and calendar with an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal.
PCF2129
The PCF2129 is a CMOS real-time clock (RTC) and calendar with an integrated Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz crystal.
RTCs with I²C-Bus
PCF85053A
PCF85053A is a CMOS real-time clock (RTC) and calendar, optimized for low-power consumption and automatic switching to battery on primary power loss.
PCF85063A
The PCF85063ATL is a CMOS real-time clock (RTC) and calendar optimized for low-power consumption.
PCF85063TP
The PCF85063TP is a CMOS real-time clock (RTC) and calendar optimized for low-power consumption.
PCF85363A
The PCF85363A is a CMOS real-time clock (RTC) and calendar optimized for low-power consumption and with automatic switching to battery on main power loss.
PCF85263A
The PCF85263A is a CMOS real-time clock (RTC) and calendar optimized for low-power consumption and with automatic switching to battery on main power loss.
PCF8563
The PCF8563 is a CMOS real-time clock (RTC) and calendar optimized for low-power consumption.
Evaluation Boards and Reference Designs
NXP offers evaluation boards and reference designs that make secure edge solutions connected and efficient with innovative analog technologies. Start today.
Additional Documents
NXP System Management I²C, I3C and SPI Selector Guide
Selector guide of interface components for all your design needs.
Read the selector guideSolutions Around the Core: Analog, Interfaces and NFC
Discover other solutions we offer for your designs.
Read the brochureAutomotive Solutions Advanced Analog Fact Sheet
NXP’s robust portfolio of automotive-compliant products includes over 700 devices and solutions that help enable breakthrough automotive designs.
Read the fact sheet