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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 (Incl JCT)	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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RV-3049-C3-TB-QA-OPT.B	2358521 Data Sheet + RoHS	RTC IC, Date Time Format (Year/Month/Date/Hr/Min/Sec 24Hr), SPI, 1.3 V to 5.5 V, SON-10 MICRO CRYSTAL You previously purchased this product. View in Order History	Each	1+ ¥1,065.22 (¥1,171.74) 10+ ¥941.67 (¥1,035.84) 25+ ¥880.45 (¥968.50) 50+ ¥850.40 (¥935.44) 100+ ¥813.66 (¥895.03) 250+ ¥773.01 (¥850.31) 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:DD:Hr:Min:Secs	24Hr	RTC	1.3V	5.5V	SON	10Pins	SPI	-40°C	125°C	-	-
RV-3049-C2-TA-QC-OPT.A	2358514 Data Sheet + RoHS	RTC IC, Date Time Format (Year/Month/Date/Hr/Min/Sec 24Hr), SPI, 1.3 V to 5.5 V, SON-10 MICRO CRYSTAL You previously purchased this product. View in Order History	Each	1+ ¥1,491.84 (¥1,641.02) 10+ ¥1,116.65 (¥1,228.32) 25+ ¥1,000.05 (¥1,100.06) 50+ ¥942.10 (¥1,036.31)	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	YYYY:MM:DD:Hr:Min:Secs	24Hr	RTC	1.3V	5.5V	SON	10Pins	SPI	-40°C	85°C	-	-
DS1685EN-3+	2515365 Data Sheet + RoHS	Alarm RTC IC, Day/Date/Month/Year/Century hh:mm:ss, Multiplexed, 2.7 V to 3.7 V, TSSOP-24 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥1,568.33 (¥1,725.16) 10+ ¥1,444.78 (¥1,589.26) 62+ ¥1,375.77 (¥1,513.35) 124+ ¥1,218.82 (¥1,340.70) 310+ ¥1,120.87 (¥1,232.96) 558+ ¥1,040.73 (¥1,144.80) 1054+ ¥969.50 (¥1,066.45) 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; Century	HH:MM:SS	Alarm RTC	2.7V	3.7V	TSSOP	24Pins	Multiplexed	-40°C	85°C	-	-
MCP795W10-I/SL	2361120 Data Sheet + RoHS	Alarm RTC IC, Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr, SPI, 1.8 V to 3.6 V, SOIC-14 MICROCHIP You previously purchased this product. View in Order History	Each	1+ ¥284.17 (¥312.59) 25+ ¥276.76 (¥304.44)	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	12Hr / 24Hr	Alarm RTC	1.8V	3.6V	SOIC	14Pins	SPI	-40°C	85°C	-	AEC-Q100
DS1501YZ+	2515419 Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year/Century hh:mm:ss), Bytewide, 4.5 V to 5.5 V, WSOIC-28 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥2,363.79 (¥2,600.17) 10+ ¥1,711.71 (¥1,882.88) 25+ ¥1,545.56 (¥1,700.12) 100+ ¥1,543.99 (¥1,698.39) 250+ ¥1,542.42 (¥1,696.66) 500+ ¥1,540.86 (¥1,694.95) 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; Century	HH:MM:SS	RTC	4.5V	5.5V	WSOIC	28Pins	Bytewide	0°C	70°C	-	-

DS17487-5+	2515436 Data Sheet + RoHS	Alarm RTC IC, Format (Day/Date/Month/Year hh:mm:ss), Multiplexed, 4.5 V to 5.5 V supply, EDIP-24 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥3,326.02 (¥3,658.62) 14+ ¥3,111.03 (¥3,422.13) 28+ ¥2,868.87 (¥3,155.76) 112+ ¥2,778.21 (¥3,056.03) 252+ ¥2,732.88 (¥3,006.17)	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	4.5V	5.5V	EDIP	24Pins	Multiplexed	0°C	70°C	-	-

DS1340U-33+	2515382 Data Sheet + RoHS	Real Time Clock/Calendar IC, Trickle Charger, I2C, HH:MM:SS, Day; Date; Month; Year, 5.5 V, µSOP-8 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥1,042.39 (¥1,146.63) 10+ ¥747.70 (¥822.47) 50+ ¥732.03 (¥805.23) 100+ ¥633.27 (¥696.60) 250+ ¥579.98 (¥637.98) 500+ ¥509.44 (¥560.38) 1000+ ¥496.12 (¥545.73) 2500+ ¥483.01 (¥531.31) 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	2.97V	5.5V	SOP	8Pins	I2C	-40°C	85°C	-	-

DS1392U-33+	2515397 Data Sheet + RoHS	Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), SPI, 2.97 V to 5.5 V, µSOP-10 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥795.86 (¥875.45) 10+ ¥676.76 (¥744.44) 50+ ¥630.01 (¥693.01) 100+ ¥585.48 (¥644.03) 250+ ¥554.32 (¥609.75) 500+ ¥498.66 (¥548.53) 1000+ ¥473.06 (¥520.37) 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:hh	Alarm RTC	2.97V	5.5V	SOP	10Pins	SPI	-40°C	85°C	-	-

DS1744WP-120IND+	2515498 Data Sheet + RoHS	RTC, Date Time Format (Day/Date/Month/Year/Century, HH:MM:SS), Bytewide, 2.97V to 3.63V, PWRCP-34 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥7,509.90 (¥8,260.89) 10+ ¥6,229.66 (¥6,852.63) 40+ ¥5,348.31 (¥5,883.14) 120+ ¥5,312.62 (¥5,843.88)	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; Century	HH:MM:SS	RTC	2.97V	3.63V	PWRCP	34Pins	Bytewide	-40°C	85°C	-	-

DS1744W-120+	2515517 Data Sheet + RoHS	RTC, Timekeeper NVSRAM, Bytewide, 2.97 V to 3.63 V, EDIP-28 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥5,550.60 (¥6,105.66) 12+ ¥5,312.34 (¥5,843.57) 36+ ¥5,193.21 (¥5,712.53) 108+ ¥5,074.08 (¥5,581.49) 252+ ¥4,954.95 (¥5,450.45)	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; Century	HH:MM:SS	RTC	2.97V	3.63V	EDIP	28Pins	Bytewide	0°C	70°C	-	-

DS1685SN-5+	2798734 Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), Bytewide, 4.5 V to 5.5 V supply, TSSOP-24 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥1,367.98 (¥1,504.78) 10+ ¥1,236.63 (¥1,360.29) 30+ ¥1,177.64 (¥1,295.40) 120+ ¥1,123.48 (¥1,235.83) 270+ ¥1,096.39 (¥1,206.03) 510+ ¥1,069.30 (¥1,176.23) 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	TSSOP	24Pins	Bytewide	-40°C	85°C	-	-

MCP79412-I/MS	3385454 Data Sheet + RoHS	RTCC, -40 TO 85DEG C MICROCHIP You previously purchased this product. View in Order History	Each	1+ ¥174.00 (¥191.40) 25+ ¥167.60 (¥184.36)	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	MSOP	8Pins	I2C	-40°C	85°C	-	-

MCP79402-I/SN	2361119 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+ ¥163.02 (¥179.32) 25+ ¥150.48 (¥165.53) 100+ ¥142.65 (¥156.92)	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	12Hr / 24Hr	Alarm RTC	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-

MCP7940M-I/P	2098894 Data Sheet + RoHS	RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), I2C, 1.8 V to 5.5 V, DIP-8 MICROCHIP You previously purchased this product. View in Order History	Each	1+ ¥116.00 (¥127.60) 25+ ¥106.59 (¥117.25) 100+ ¥104.03 (¥114.43)	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	DD:MM:YYYY	HH:MM:SS	RTC	1.8V	5.5V	DIP	8Pins	I2C	-40°C	85°C	-	AEC-Q100

MCP7940N-I/P	2361114 Data Sheet + RoHS	Alarm RTC IC, Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr, I2C, 1.8 V to 5.5 V, DIP-8 MICROCHIP You previously purchased this product. View in Order History	Each	1+ ¥144.21 (¥158.63) 25+ ¥139.12 (¥153.03) 100+ ¥136.98 (¥150.68)	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	12Hr / 24Hr	Alarm RTC	1.8V	5.5V	DIP	8Pins	I2C	-40°C	85°C	-	AEC-Q100

MCP79511-I/MS	2361125 Data Sheet + RoHS	Alarm RTC IC, Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr, SPI, 1.8 V to 3.6 V, MSOP-10 MICROCHIP You previously purchased this product. View in Order History	Each	1+ ¥217.89 (¥239.68) 25+ ¥200.64 (¥220.70) 100+ ¥191.24 (¥210.36)	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	12Hr / 24Hr	Alarm RTC	1.8V	3.6V	MSOP	10Pins	SPI	-40°C	85°C	-	AEC-Q100

MCP79400-I/SN	2361117 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+ ¥148.92 (¥163.81) 25+ ¥137.94 (¥151.73) 100+ ¥130.11 (¥143.12)	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	12Hr / 24Hr	Alarm RTC	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-

MCP7940M-I/SN	2098890 Data Sheet + RoHS	RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), I2C, 1.8 V to 5.5 V, SOIC-8 MICROCHIP You previously purchased this product. View in Order History	Each	1+ ¥105.03 (¥115.53) 25+ ¥101.57 (¥111.73) 100+ ¥99.68 (¥109.65)	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	DD:MM:YYYY	HH:MM:SS	RTC	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	AEC-Q100

PCA2129T/Q900/2,51	2427480 Data Sheet + RoHS	Calendar, Clock IC, Year/Month/Week/Date/Hr/Min/Sec Binary, I2C, SPI, 1.8 V to 4.2 V, SOIC-16 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2427480 2427480RL in Re-reel	1+ ¥785.32 (¥863.85) 10+ ¥637.98 (¥701.78) 25+ ¥618.65 (¥680.52) 50+ ¥599.32 (¥659.25) 100+ ¥579.98 (¥637.98) 250+ ¥551.76 (¥606.94) 500+ ¥541.29 (¥595.42) 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	-	-

DS1243Y-120+	2515439 Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), Parallel, 4.5 V to 5.5 V, EDIP-28 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥6,279.41 (¥6,907.35) 12+ ¥5,765.27 (¥6,341.80) 36+ ¥5,445.50 (¥5,990.05) 108+ ¥5,127.30 (¥5,640.03) 252+ ¥4,918.82 (¥5,410.70)	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:hh	RTC	4.5V	5.5V	EDIP	28Pins	Parallel	0°C	70°C	-	-

DS3231MZ+TRL	2515487 Data Sheet + RoHS	Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 2.3 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	1+ ¥1,914.66 (¥2,106.13) 10+ ¥1,315.70 (¥1,447.27) 25+ ¥1,159.51 (¥1,275.46) 100+ ¥982.98 (¥1,081.28) 250+ ¥960.56 (¥1,056.62) 500+ ¥949.34 (¥1,044.27) 2500+ ¥938.12 (¥1,031.93) 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	2.3V	5.5V	NSOIC	8Pins	I2C	-40°C	85°C	-	-

DS1339U-33+T&R	2515464 Data Sheet + RoHS	Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 2.97 V to 5.5 V, µSOP-8 ANALOG DEVICES You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape	1+ ¥1,119.20 (¥1,231.12) 10+ ¥744.57 (¥819.03) 25+ ¥647.38 (¥712.12) 100+ ¥536.09 (¥589.70) 250+ ¥482.79 (¥531.07) 500+ ¥471.95 (¥519.15) 1000+ ¥466.53 (¥513.18) 3000+ ¥461.11 (¥507.22) 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	2.97V	5.5V	SOP	8Pins	I2C	-40°C	85°C	-	-

DS1687-5+	2515431 Data Sheet + RoHS	Alarm RTC IC, Day/Date/Month/Year/Century hh:mm:ss, Multiplexed, 4.5 V to 5.5 V, EDIP-24 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥3,327.81 (¥3,660.59) 14+ ¥2,553.46 (¥2,808.81) 28+ ¥2,268.18 (¥2,495.00) 112+ ¥2,128.67 (¥2,341.54) 252+ ¥2,105.16 (¥2,315.68) 504+ ¥2,063.06 (¥2,269.37) 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; Century	HH:MM:SS	Alarm RTC	4.5V	5.5V	EDIP	24Pins	Multiplexed	0°C	70°C	-	-

DS12C887+	2515425 Data Sheet + RoHS	Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), Multiplexed, 4.5 V to 5.5 V, EDIP-24 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥2,622.43 (¥2,884.67) 14+ ¥1,760.31 (¥1,936.34) 28+ ¥1,603.56 (¥1,763.92) 112+ ¥1,515.45 (¥1,667.00) 252+ ¥1,471.40 (¥1,618.54) 504+ ¥1,427.35 (¥1,570.09) 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	4.5V	5.5V	EDIP	24Pins	Multiplexed	0°C	70°C	-	-

DS3231SN#	2518948 Data Sheet + RoHS	RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), I2C, 2.3 V to 5.5 V, WSOIC-16 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥2,459.41 (¥2,705.35) 10+ ¥1,719.55 (¥1,891.51) 46+ ¥1,420.16 (¥1,562.18) 138+ ¥1,365.98 (¥1,502.58) 276+ ¥1,338.88 (¥1,472.77) 506+ ¥1,311.78 (¥1,442.96) 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:YYYY	HH:MM:SS	RTC	2.3V	5.5V	WSOIC	16Pins	I2C	-40°C	85°C	-	-