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Real-Time Clock products offer a diverse range of real-time clock (RTC) solutions for networking and embedded applications. The primary function of RTC is to keep time and calendar data.

We offer Real Time Clock (RTC) functions including Alarm RTC, Binary Counter, Real Time Calendar Clock (RTCC), Elapsed Time Recorder and Real Time Event Recorder.

Use of a hardware RTC allows microcontrollers like the Raspberry Pi to be used without internet access and still provide services that use time stamps. For example, the DS1307 is a commonly available I2C based RTC module – so using the DS1307’s I2C protocol, which is supported by the Raspberry Pi, real time clock support can easily and cost-effectively be added.

Another popular RTC module, also with I2C support, is the DS3231. The DS3231 is a low-cost, extremely accurate I²C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, and maintains accurate timekeeping when mains power to the device is interrupted. Accuracy is ±2ppm from 0°C to +40°C, and ±3.5ppm from -40°C to +85°C.

Apart from I2C, other interface types include 2 wire, 3 wire, 4 wire, Motorola Serial Peripheral Interface (SPI), Bytewide, Parallel, Multiplexed, and Phantom Clock.

Operating temperatures range from -40°C minimum to +125°C maximum. Products are available to the AEC-Q100 Automotive Qualification Standard.

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Manufacturer Part No	Order Code	Description / Manufacturer	Price For	Price	Quantity	Date Format	Clock Format	Clock IC Type	Supply Voltage Min	Supply Voltage Max	Clock IC Case Style	No. of Pins	IC Interface Type	Operating Temperature Min	Operating Temperature Max	Product Range	Automotive Qualification Standard
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MAX31328NELB+	3677599 Data Sheet + RoHS	Real Time Clock, Alarm RTC, I2C, 12Hr / 24Hr, 2.3 V to 5.5 V, LGA-10, -40 °C to 85 °C ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ HK$39.38 10+ HK$35.38 25+ HK$33.44 100+ HK$28.69 490+ HK$24.42 980+ HK$20.81 2940+ HK$19.77 5390+ HK$19.38 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	Day; Date; Month; Year	12Hr / 24Hr	Alarm RTC	2.3V	5.5V	LGA	10Pins	I2C	-40°C	85°C	-	-
MCP79410-I/SN	1823155 Data Sheet + RoHS	Battery Backed I2C Real Time Clock/Calendar with EEPROM and Unique ID in SOIC-8 Package MICROCHIP You previously purchased this product. View in Order History	Each	1+ HK$8.73 25+ HK$8.39	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	-	-	-	-	-	-	-	-	-	-
MCP7940N-I/SN	2361122 Data Sheet + RoHS	Alarm RTC IC, Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr, I2C, 1.8 V to 5.5 V, SOIC-8 MICROCHIP You previously purchased this product. View in Order History	Each	1+ HK$7.13 25+ HK$6.63 100+ HK$6.53	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	-	-	-	-	-	-	-	-	-	-
PCF8523T/1,118	2400452RL Data Sheet + RoHS	Calendar, Clock IC, Format (YYYY:MM:WK:DD:hh:mm:ss/Binary), I2C, 1.2 V to 5.5 V supply, SOIC-8 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2400452RL 2400452 in Cut Tape	100+ HK$9.48 250+ HK$8.90 500+ HK$7.79 1000+ HK$6.46	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	-	-	-	-	-	-	-	-	-	-	-	-
DS1307+	2515369 Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, Serial, 4.5 V to 5.5 V, DIP-8 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ HK$44.56 10+ HK$38.15 50+ HK$37.86 100+ HK$32.72 250+ HK$31.08 500+ HK$27.87 1000+ HK$23.51 2500+ HK$22.38 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	Day; Date; Month; Year	HH:MM:SS	RTC	4.5V	5.5V	DIP	8Pins	I2C, Serial	0°C	70°C	-	-

PCF85063TP/1Z	2427483 Data Sheet + RoHS	Calendar, Clock IC, Year/Month/Week/Date/Hr/Min/Sec Binary, I2C, 900 mV to 5.5 V, HWSON-8 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2427483 2427483RL in Re-reel	1+ HK$8.48 10+ HK$7.64 100+ HK$5.96 500+ HK$4.93 1000+ HK$3.89 2000+ HK$3.64 4000+ HK$3.45 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	900mV	5.5V	HWSON	8Pins	I2C	-40°C	85°C	-	-

PCF8523T/1,118	2400452 Data Sheet + RoHS	Calendar, Clock IC, Format (YYYY:MM:WK:DD:hh:mm:ss/Binary), I2C, 1.2 V to 5.5 V supply, SOIC-8 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2400452 2400452RL in Re-reel	1+ HK$13.09 10+ HK$11.79 25+ HK$11.12 100+ HK$9.48 250+ HK$8.90 500+ HK$7.79 1000+ HK$6.46 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	-	-	-	-	-	-	-	-	-	-

DS12887+	2518671 Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year 12Hr / 24Hr), Multiplexed, 4.5 V to 5.5 V, DIP-24 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ HK$100.12 14+ HK$88.37 28+ HK$77.77 112+ HK$73.98 252+ HK$70.70 504+ HK$66.83 1008+ HK$63.50 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	Day; Date; Month; Year	12Hr / 24Hr	RTC	4.5V	5.5V	EDIP	24Pins	Multiplexed	0°C	70°C	-	-

PCF85063ATT/AJ	2775937 Data Sheet + RoHS	Calendar, Clock IC, Format (YYYY:MM:WK:DD:hh:mm:ss/Binary), I2C, 900 mV to 5.5 V supply, TSSOP-8 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2775937 2775937RL in Re-reel	1+ HK$8.56 10+ HK$7.64 25+ HK$7.27 100+ HK$5.97 250+ HK$5.58 500+ HK$4.93 1000+ HK$3.89 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	900mV	5.5V	TSSOP	8Pins	I2C	-40°C	85°C	-	-

DS3231S#T&R	2798759 Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 2.3 V to 5.5 V supply, SOIC-16 ANALOG DEVICES You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2798759 2798759RL in Re-reel	1+ HK$72.42 10+ HK$65.35 25+ HK$62.39 100+ HK$54.42 250+ HK$51.87 500+ HK$48.42 1000+ HK$47.43 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	Day; Date; Month; Year	HH:MM:SS	RTC	2.3V	5.5V	SOIC	16Pins	I2C	0°C	70°C	-	-

DS1302Z+T&R	2515451 Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), Serial, 2 V to 5.5 V, NSOIC-8 ANALOG DEVICES You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2515451 2515451RL in Re-reel	1+ HK$35.84 10+ HK$32.21 25+ HK$30.45 100+ HK$26.39 250+ HK$25.04 500+ HK$22.47 2500+ HK$18.95 5000+ HK$18.58 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	Day; Date; Month; Year	HH:MM:SS	RTC	2V	5.5V	NSOIC	8Pins	Serial	0°C	70°C	-	-

PCF2129T/2,518	2400451 Data Sheet + RoHS	Calendar, Clock IC, Format (YYYY:MM:WK:DD:hh:mm:ss/Binary), I2C, SPI, 1.8V to 4.2V supply, SOIC-16 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2400451 2400451RL in Re-reel	1+ HK$49.55 10+ HK$44.78 25+ HK$42.70 100+ HK$37.07 250+ HK$35.41 500+ HK$32.93 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	1.8V	4.2V	SOIC	16Pins	I2C, SPI	-40°C	85°C	-	-

MCP79410T-I/MNY	2851649 Data Sheet + RoHS	RTC, Clock/Calendar, Date Time Format (YY-MM-DD-dd, HH:MM:SS), I2C, 1.8V to 5.5V Supply, TDFN-8 MICROCHIP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2851649 2851649RL in Re-reel	1+ HK$9.29 25+ HK$8.86	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	YY-MM-DD-dd	HH:MM:SS	RTCC	1.8V	5.5V	TDFN	8Pins	I2C	-40°C	85°C	-	-

DS1337S+T&R	2515455 Data Sheet + RoHS	Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 1.8 V to 5.5 V, NSOIC-8 ANALOG DEVICES You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2515455 2515455RL in Re-reel	1+ HK$28.94 10+ HK$26.06 25+ HK$24.58 100+ HK$21.29 250+ HK$20.23 500+ HK$18.17 2500+ HK$15.79 5000+ HK$15.48 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	Day; Date; Month; Year	HH:MM:SS	Alarm RTC	1.8V	5.5V	NSOIC	8Pins	I2C	-40°C	85°C	-	-

PCF8563BS/4,118	2400453 Data Sheet + RoHS	Calendar, Clock IC, Format (YYYY:MM:WK:DD:hh:mm:ss/Binary), I2C, 1 V to 5.5 V supply, HVSON-10 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2400453 2400453RL in Re-reel	1+ HK$13.16 10+ HK$11.79 25+ HK$11.19 100+ HK$9.19 250+ HK$8.59 500+ HK$7.60 1000+ HK$6.00 2500+ HK$5.60 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	1V	5.5V	HVSON	10Pins	I2C	-40°C	85°C	-	-

PCF85063TP/1Z	2427483RL Data Sheet + RoHS	Calendar, Clock IC, Year/Month/Week/Date/Hr/Min/Sec Binary, I2C, 900 mV to 5.5 V, HWSON-8 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2427483RL 2427483 in Cut Tape	100+ HK$5.96 500+ HK$4.93 1000+ HK$3.89 2000+ HK$3.64 4000+ HK$3.45	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	900mV	5.5V	HWSON	8Pins	I2C	-40°C	85°C	-	-

PCF2129T/2,518	2400451RL Data Sheet + RoHS	Calendar, Clock IC, Format (YYYY:MM:WK:DD:hh:mm:ss/Binary), I2C, SPI, 1.8V to 4.2V supply, SOIC-16 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2400451RL 2400451 in Cut Tape	10+ HK$44.78 25+ HK$42.70 100+ HK$37.07 250+ HK$35.41 500+ HK$32.93	Restricted Item Minimum order of 10 items Multiples of 1 only Please enter a valid quantity Add Min: 10 Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	1.8V	4.2V	SOIC	16Pins	I2C, SPI	-40°C	85°C	-	-

DS1308U-33+T	3596303 Data Sheet + RoHS	Real Time Clock, RTC, I2C, 3 V to 5.5 V, µSOP-8, -40 °C to 85 °C ANALOG DEVICES You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:3596303 3596303RL in Re-reel	1+ HK$39.95 10+ HK$34.78 25+ HK$34.74 100+ HK$29.43 250+ HK$27.95 500+ HK$25.08 3000+ HK$19.98 6000+ HK$19.59 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	Day; Date; Month; Year	HH:MM:SS	RTC	3V	5.5V	µSOP	8Pins	I2C	-40°C	85°C	-	-

PCF8563BS/4,118	2400453RL Data Sheet + RoHS	Calendar, Clock IC, Format (YYYY:MM:WK:DD:hh:mm:ss/Binary), I2C, 1 V to 5.5 V supply, HVSON-10 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2400453RL 2400453 in Cut Tape	100+ HK$9.19 250+ HK$8.59 500+ HK$7.60 1000+ HK$6.00 2500+ HK$5.60	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	1V	5.5V	HVSON	10Pins	I2C	-40°C	85°C	-	-

DS1302Z+T&R	2515451RL Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), Serial, 2 V to 5.5 V, NSOIC-8 ANALOG DEVICES You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2515451RL 2515451 in Cut Tape	100+ HK$26.39 250+ HK$25.04 500+ HK$22.47 2500+ HK$18.95 5000+ HK$18.58	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	Day; Date; Month; Year	HH:MM:SS	RTC	2V	5.5V	NSOIC	8Pins	Serial	0°C	70°C	-	-

DS1337S+T&R	2515455RL Data Sheet + RoHS	Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 1.8 V to 5.5 V, NSOIC-8 ANALOG DEVICES You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2515455RL 2515455 in Cut Tape	100+ HK$21.29 250+ HK$20.23 500+ HK$18.17 2500+ HK$15.79 5000+ HK$15.48	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	Day; Date; Month; Year	HH:MM:SS	Alarm RTC	1.8V	5.5V	NSOIC	8Pins	I2C	-40°C	85°C	-	-

PCF85063ATT/AJ	2775937RL Data Sheet + RoHS	Calendar, Clock IC, Format (YYYY:MM:WK:DD:hh:mm:ss/Binary), I2C, 900 mV to 5.5 V supply, TSSOP-8 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2775937RL 2775937 in Cut Tape	100+ HK$5.97 250+ HK$5.58 500+ HK$4.93 1000+ HK$3.89	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	900mV	5.5V	TSSOP	8Pins	I2C	-40°C	85°C	-	-

DS3231S#T&R	2798759RL Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 2.3 V to 5.5 V supply, SOIC-16 ANALOG DEVICES You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2798759RL 2798759 in Cut Tape	10+ HK$65.35 25+ HK$62.39 100+ HK$54.42 250+ HK$51.87 500+ HK$48.42 1000+ HK$47.43 More Pricing...	Restricted Item Minimum order of 10 items Multiples of 1 only Please enter a valid quantity Add Min: 10 Mult: 1	Day; Date; Month; Year	HH:MM:SS	RTC	2.3V	5.5V	SOIC	16Pins	I2C	0°C	70°C	-	-

MCP79410T-I/MNY	2851649RL Data Sheet + RoHS	RTC, Clock/Calendar, Date Time Format (YY-MM-DD-dd, HH:MM:SS), I2C, 1.8V to 5.5V Supply, TDFN-8 MICROCHIP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2851649RL 2851649 in Cut Tape	25+ HK$8.86	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	YY-MM-DD-dd	HH:MM:SS	RTCC	1.8V	5.5V	TDFN	8Pins	I2C	-40°C	85°C	-	-

DS1308U-33+T	3596303RL Data Sheet + RoHS	Real Time Clock, RTC, I2C, 3 V to 5.5 V, µSOP-8, -40 °C to 85 °C ANALOG DEVICES You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:3596303RL 3596303 in Cut Tape	100+ HK$29.43 250+ HK$27.95 500+ HK$25.08 3000+ HK$19.98 6000+ HK$19.59	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	Day; Date; Month; Year	HH:MM:SS	RTC	3V	5.5V	µSOP	8Pins	I2C	-40°C	85°C	-	-