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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 (ex VAT) (inc VAT)	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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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+ CNY8.06 CNY9.11	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	DD:MM:YY	HH:MM:SS	RTC	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	MCP79410 MCP79411 MCP79412	AEC-Q100
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	1+ CNY6.21 CNY7.02	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	-	-	-	-	5.5V	-	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+ CNY6.21 CNY7.02	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	-	-	5.5V	-	8Pins	I2C	-40°C	85°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+ CNY7.88 CNY8.90 10+ CNY6.69 CNY7.56 100+ CNY5.13 CNY5.80 500+ CNY4.49 CNY5.07 1000+ CNY3.67 CNY4.15 2500+ CNY3.42 CNY3.86 5000+ CNY3.25 CNY3.67 10000+ CNY3.13 CNY3.54 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	-	-	5.5V	-	8Pins	I2C	-40°C	85°C	-	-
PCF8563T/5,518	2775929 Data Sheet + RoHS	Calendar, Clock IC, Format (YYYY:MM:WK:DD:hh:mm:ss/Binary), I2C, 1 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:2775929 2775929RL in Re-reel	1+ CNY8.93 CNY10.09 10+ CNY8.02 CNY9.06 25+ CNY7.23 CNY8.17 100+ CNY6.26 CNY7.07 250+ CNY5.85 CNY6.61 500+ CNY5.17 CNY5.84 1000+ CNY4.38 CNY4.95 2500+ CNY3.85 CNY4.35 5000+ CNY3.67 CNY4.15 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	SOIC	8Pins	I2C	-40°C	85°C	-	-

PCF8563T/F4,118	2841031 Data Sheet + RoHS	RTC, Date Time Format (DD:MM:YY, HH:MM:SS, Century Flag), 400 kbit/s, I2C, 1.8V to 5.5V, SOIC-8 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2841031 2841031RL in Re-reel	1+ CNY12.82 CNY14.49 10+ CNY10.73 CNY12.12 100+ CNY8.70 CNY9.83 500+ CNY7.64 CNY8.63 1000+ CNY6.32 CNY7.14 2500+ CNY5.88 CNY6.64 5000+ CNY5.74 CNY6.49 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	-	-	5.5V	-	8Pins	I2C	-40°C	85°C	-	-

DS3231SN#T&R	2798760 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:2798760 2798760RL in Re-reel	1+ CNY84.61 CNY95.61 10+ CNY76.46 CNY86.40 25+ CNY72.94 CNY82.42 100+ CNY63.31 CNY71.54 250+ CNY60.45 CNY68.31 500+ CNY55.16 CNY62.33 1000+ CNY53.25 CNY60.17 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	-40°C	85°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+ CNY47.28 CNY53.43 10+ CNY42.78 CNY48.34 25+ CNY40.76 CNY46.06 100+ CNY35.45 CNY40.06 250+ CNY33.80 CNY38.19 500+ CNY30.95 CNY34.97 1000+ CNY26.83 CNY30.32 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	-	-

DS1302+	2518645 Data Sheet + RoHS	Timekeeper IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), 3 Wire, Serial, 2 V to 5.5 V, DIP-8 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ CNY15.60 CNY17.63	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	Timekeeper	2V	5.5V	DIP	8Pins	3 Wire, Serial	0°C	70°C	-	-

MCP7940NT-I/SN	2857529 Data Sheet + RoHS	RTC, Date Time Format (Day/Date/Month/Year, HH:MM:SS), I2C, 1.8V to 5.5V Supply, SOIC-8 MICROCHIP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2857529 2857529RL in Re-reel	1+ CNY7.02 CNY7.93	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	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-

PCF85263ATT/AJ	2775936 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:2775936 2775936RL in Re-reel	1+ CNY10.50 CNY11.87 10+ CNY9.23 CNY10.43 100+ CNY7.17 CNY8.10 500+ CNY6.04 CNY6.83 1000+ CNY4.77 CNY5.39 2500+ CNY4.47 CNY5.05 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	-	-

PCF85363ATT/AJ	2775939 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:2775939 2775939RL in Re-reel	1+ CNY9.33 CNY10.54 10+ CNY8.23 CNY9.30 100+ CNY6.59 CNY7.45 500+ CNY5.92 CNY6.69 1000+ CNY4.85 CNY5.48 2500+ CNY4.62 CNY5.22 5000+ CNY4.56 CNY5.15 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	-	-

PCF85263ATL/AX	2775935 Data Sheet + RoHS	Calendar, Clock IC, Format (YYYY:MM:WK:DD:hh:mm:ss/Binary), I2C, 900 mV to 5.5 V supply, DFN2626-10 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2775935 2775935RL in Re-reel	1+ CNY9.48 CNY10.71 10+ CNY8.23 CNY9.30 100+ CNY6.29 CNY7.11 500+ CNY5.50 CNY6.22 1000+ CNY4.35 CNY4.92 2000+ CNY4.19 CNY4.73 4000+ CNY3.85 CNY4.35 8000+ CNY3.80 CNY4.29 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	-	-	5.5V	-	-	I2C	-40°C	85°C	-	-

M41T00SM6F	2463681 Data Sheet Data Sheet + RoHS	RTC IC, Date Time Format (Date/Month/Year ss:mm:hh), I2C, 2.7 V to 5.5 V supply, SOIC-8 STMICROELECTRONICS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2463681 2463681RL in Re-reel	5+ CNY29.00 CNY32.77 100+ CNY26.03 CNY29.41 250+ CNY24.61 CNY27.81 1000+ CNY21.33 CNY24.10 2500+ CNY20.23 CNY22.86 5000+ CNY18.16 CNY20.52 10000+ CNY15.32 CNY17.31 More Pricing...	Restricted Item Minimum order of 5 items Multiples of 5 only Please enter a valid quantity Add Min: 5 Mult: 5	DD:MM:YYYY	ss:mm:hh	RTC	2.7V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-

PCF8523TK/1,118	2427484 Data Sheet + RoHS	Calendar, Clock IC, Year/Month/Week/Date/Hr/Min/Sec Binary, I2C, 1.2 V to 5.5 V, HVSON-8 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2427484 2427484RL in Re-reel	1+ CNY14.32 CNY16.18 10+ CNY12.67 CNY14.32 100+ CNY10.19 CNY11.51 500+ CNY8.40 CNY9.49 1000+ CNY7.31 CNY8.26 2500+ CNY6.95 CNY7.85 6000+ CNY6.84 CNY7.73 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	1.2V	5.5V	HVSON	8Pins	I2C	-40°C	85°C	-	-

PCF8563TS/5,118	2775932 Data Sheet + RoHS	Real Time Clock/Calendar IC, Alarm, I2C, HH:MM:SS, Day; Date; Month; Year, 1 V to 5.5 V, TSSOP-8 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2775932 2775932RL in Re-reel	1+ CNY12.19 CNY13.77 10+ CNY10.36 CNY11.71 100+ CNY8.01 CNY9.05 500+ CNY7.02 CNY7.93 1000+ CNY5.54 CNY6.26 2500+ CNY5.18 CNY5.85 5000+ CNY4.92 CNY5.56 10000+ CNY4.86 CNY5.49 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	1V	5.5V	TSSOP	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+ CNY42.78 CNY48.34 25+ CNY40.76 CNY46.06 100+ CNY35.45 CNY40.06 250+ CNY33.80 CNY38.19 500+ CNY30.95 CNY34.97 1000+ CNY26.83 CNY30.32 More Pricing...	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	-	-

DS1340C-33#	2729047 Data Sheet + RoHS	RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), I2C, 2.97 V to 5.5 V supply, SOIC-16 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ CNY52.66 CNY59.51 10+ CNY47.60 CNY53.79 46+ CNY44.30 CNY50.06 138+ CNY39.37 CNY44.49 276+ CNY37.53 CNY42.41 506+ CNY35.26 CNY39.84 1012+ CNY31.29 CNY35.36 More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	DD:MM:YY	HH:MM:SS	RTC	2.97V	5.5V	SOIC	16Pins	I2C	-40°C	85°C	-	-

MAX31342EWA+	3023225 Data Sheet + RoHS	RTC, Date Time Format (Day/Date/Month/Year, HH:MM:SS), I2C, 1.6V to 3.6V Supply, WLP-8 ANALOG DEVICES You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:3023225 3023225RL in Re-reel	1+ CNY11.90 CNY13.45 10+ CNY10.65 CNY12.03 30+ CNY10.14 CNY11.46 100+ CNY8.31 CNY9.39 250+ CNY7.79 CNY8.80 500+ CNY6.84 CNY7.73 2500+ CNY5.22 CNY5.90 5000+ CNY5.12 CNY5.79 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	1.6V	3.6V	WLP	8Pins	I2C	-40°C	85°C	-	-

M41T00SM6F	2463681RL Data Sheet Data Sheet + RoHS	RTC IC, Date Time Format (Date/Month/Year ss:mm:hh), I2C, 2.7 V to 5.5 V supply, SOIC-8 STMICROELECTRONICS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2463681RL 2463681 in Cut Tape	100+ CNY26.03 CNY29.41 250+ CNY24.61 CNY27.81 1000+ CNY21.33 CNY24.10 2500+ CNY20.23 CNY22.86 5000+ CNY18.16 CNY20.52 10000+ CNY15.32 CNY17.31 More Pricing...	Restricted Item Minimum order of 100 items Multiples of 5 only Please enter a valid quantity Add Min: 100 Mult: 5	DD:MM:YYYY	ss:mm:hh	RTC	2.7V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-

PCF8523TK/1,118	2427484RL Data Sheet + RoHS	Calendar, Clock IC, Year/Month/Week/Date/Hr/Min/Sec Binary, I2C, 1.2 V to 5.5 V, HVSON-8 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2427484RL 2427484 in Cut Tape	100+ CNY10.19 CNY11.51 500+ CNY8.40 CNY9.49 1000+ CNY7.31 CNY8.26 2500+ CNY6.95 CNY7.85 6000+ CNY6.84 CNY7.73	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	1.2V	5.5V	HVSON	8Pins	I2C	-40°C	85°C	-	-

PCF85363ATT/AJ	2775939RL 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:2775939RL 2775939 in Cut Tape	100+ CNY6.59 CNY7.45 500+ CNY5.92 CNY6.69 1000+ CNY4.85 CNY5.48 2500+ CNY4.62 CNY5.22 5000+ CNY4.56 CNY5.15	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	-	-

PCF85263ATL/AX	2775935RL Data Sheet + RoHS	Calendar, Clock IC, Format (YYYY:MM:WK:DD:hh:mm:ss/Binary), I2C, 900 mV to 5.5 V supply, DFN2626-10 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2775935RL 2775935 in Cut Tape	100+ CNY6.29 CNY7.11 500+ CNY5.50 CNY6.22 1000+ CNY4.35 CNY4.92 2000+ CNY4.19 CNY4.73 4000+ CNY3.85 CNY4.35 8000+ CNY3.80 CNY4.29 More Pricing...	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	-	-	-	-	5.5V	-	-	I2C	-40°C	85°C	-	-

PCF8563T/F4,118	2841031RL Data Sheet + RoHS	RTC, Date Time Format (DD:MM:YY, HH:MM:SS, Century Flag), 400 kbit/s, I2C, 1.8V to 5.5V, SOIC-8 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2841031RL 2841031 in Cut Tape	100+ CNY8.70 CNY9.83 500+ CNY7.64 CNY8.63 1000+ CNY6.32 CNY7.14 2500+ CNY5.88 CNY6.64 5000+ CNY5.74 CNY6.49	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	-	-	-	-	5.5V	-	8Pins	I2C	-40°C	85°C	-	-

DS3231SN#T&R	2798760RL 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:2798760RL 2798760 in Cut Tape	10+ CNY76.46 CNY86.40 25+ CNY72.94 CNY82.42 100+ CNY63.31 CNY71.54 250+ CNY60.45 CNY68.31 500+ CNY55.16 CNY62.33 1000+ CNY53.25 CNY60.17 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	-40°C	85°C	-	-