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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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M41T0M6F	2806827 Data Sheet + RoHS	RTC, Date Time Format (Day/Date/Month/Year/Century, HH:MM:SS), I2C, 2V to 5.5V Supply, SOIC-8 STMICROELECTRONICS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape	1+ ¥431.07 (¥474.18) 10+ ¥294.69 (¥324.16) 50+ ¥279.80 (¥307.78) 100+ ¥264.91 (¥291.40) 250+ ¥250.80 (¥275.88) 500+ ¥241.40 (¥265.54) 1000+ ¥231.99 (¥255.19) 2500+ ¥221.02 (¥243.12) 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	2V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-
MCP79410-I/ST	1823156 Data Sheet + RoHS	RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), I2C, Serial, 1.8 V to 5.5 V, TSSOP-8 MICROCHIP You previously purchased this product. View in Order History	Each	1+ ¥169.29 (¥186.22) 25+ ¥158.32 (¥174.15) 100+ ¥155.16 (¥170.68)	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	RTC	1.8V	5.5V	TSSOP	8Pins	I2C, Serial	-40°C	85°C	-	AEC-Q100
MCP79412-I/SN	2103565 Data Sheet + RoHS	Calendar, Clock IC, Year/Month/Week/Date/Hr/Min/Sec 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+ ¥257.37 (¥283.11) 25+ ¥225.20 (¥247.72) 100+ ¥189.60 (¥208.56)	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	HH:MM:SS	Calendar, Clock	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	AEC-Q100
M48T35AV-10PC1	1576955 Data Sheet + RoHS	RTC, Timekeeper NVSRAM, Parallel, 3 V to 3.6 V, DIP-28 STMICROELECTRONICS You previously purchased this product. View in Order History	Each	1+ ¥3,374.83 (¥3,712.31) 5+ ¥3,200.06 (¥3,520.07) 10+ ¥3,156.23 (¥3,471.85)	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	Timekeeper	3V	3.6V	DIP	28Pins	Parallel	0°C	70°C	-	-
DS1305N+	2515415 Data Sheet + RoHS	Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), SPI, 2 V to 5.5 V, DIP-16 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥1,902.95 (¥2,093.25) 10+ ¥1,308.87 (¥1,439.76) 25+ ¥1,152.12 (¥1,267.33) 100+ ¥988.29 (¥1,087.12) 250+ ¥966.19 (¥1,062.81) 500+ ¥955.14 (¥1,050.65) 1000+ ¥944.09 (¥1,038.50) 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	HH:MM:SS	Alarm RTC	2V	5.5V	DIP	16Pins	SPI	-40°C	85°C	-	-

X1B0003010002	2445809 Data Sheet + RoHS	RTC IC, Calendar, 2.5 V to 5.5 V, 14Pins, I2C EPSON You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape	1+ ¥766.56 (¥843.22) 10+ ¥594.67 (¥654.14) 25+ ¥564.29 (¥620.72) 50+ ¥540.69 (¥594.76) 100+ ¥519.63 (¥571.59) 250+ ¥501.68 (¥551.85) 1250+ ¥484.50 (¥532.95) 2500+ ¥468.72 (¥515.59) More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	Alarm RTC	2.5V	5.5V	-	10Pins	I2C	-40°C	85°C	-	-

DS1302Z+	2519519 Data Sheet + RoHS	Timekeeper IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), 3 Wire, Serial, 2 V to 5.5 V, SOIC-8 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥1,100.39 (¥1,210.43) 10+ ¥686.57 (¥755.23) 25+ ¥633.28 (¥696.61) 100+ ¥579.98 (¥637.98) 300+ ¥528.25 (¥581.08) 500+ ¥496.90 (¥546.59) 1000+ ¥471.82 (¥519.00) 2500+ ¥446.74 (¥491.41) 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	Timekeeper	2V	5.5V	SOIC	8Pins	3 Wire, Serial	0°C	70°C	-	-

DS1394U-33+	2515398 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+ ¥1,004.45 (¥1,104.90) 10+ ¥689.86 (¥758.85) 50+ ¥575.59 (¥633.15) 100+ ¥527.63 (¥580.39) 250+ ¥521.20 (¥573.32) 500+ ¥517.99 (¥569.79) 1000+ ¥514.78 (¥566.26) 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	-	-

DS1390U-33+	2515392 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+ ¥1,127.04 (¥1,239.74) 10+ ¥749.27 (¥824.20) 50+ ¥743.35 (¥817.69) 100+ ¥631.05 (¥694.16) 250+ ¥576.61 (¥634.27) 500+ ¥543.44 (¥597.78) 1000+ ¥515.90 (¥567.49) 2500+ ¥492.87 (¥542.16) 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	-	-

DS12C887A+	2515426 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+ ¥1,612.96 (¥1,774.26) 112+ ¥1,527.96 (¥1,680.76) 252+ ¥1,485.46 (¥1,634.01) 504+ ¥1,442.96 (¥1,587.26) 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	-	-

DS1687-5IND+	2515433 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+ ¥4,370.19 (¥4,807.21) 14+ ¥3,219.65 (¥3,541.62) 28+ ¥2,866.96 (¥3,153.66) 112+ ¥2,636.29 (¥2,899.92) 252+ ¥2,456.28 (¥2,701.91) 504+ ¥2,407.16 (¥2,647.88) 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	-40°C	85°C	-	-

X1B0002320001	2445808 Data Sheet + RoHS	RTC IC, Calendar, 1.6 V to 5.5 V, SOP, 14Pins, I2C, SPI EPSON You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape	1+ ¥1,084.25 (¥1,192.68) 10+ ¥841.11 (¥925.22) 25+ ¥798.14 (¥877.95) 50+ ¥764.76 (¥841.24) 100+ ¥734.98 (¥808.48) 250+ ¥709.58 (¥780.54) 1250+ ¥685.28 (¥753.81) 2500+ ¥662.97 (¥729.27) More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	Alarm RTC	1.6V	5.5V	SOP	14Pins	I2C, SPI	-40°C	85°C	-	-

DS1338C-33#	2765023 Data Sheet + RoHS	RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), I2C, 3 V to 5.5 V supply, SOIC-16 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ ¥1,584.75 (¥1,743.23) 10+ ¥1,254.00 (¥1,379.40) 46+ ¥1,040.82 (¥1,144.90) 138+ ¥895.05 (¥984.56) 276+ ¥841.75 (¥925.93) 506+ ¥804.13 (¥884.54) 1012+ ¥802.56 (¥882.82) 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	3V	5.5V	SOIC	16Pins	I2C	-40°C	85°C	-	-

PCF2123BS/1,518	2775940 Data Sheet + RoHS	Calendar, Clock IC, Format (YYYY:MM:WK:DD:hh:mm:ss/Binary), I2C, 1.1 V to 5.5 V supply, HVQFN-16 NXP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape	1+ ¥210.05 (¥231.06) 10+ ¥138.89 (¥152.78) 50+ ¥127.21 (¥139.93) 100+ ¥115.53 (¥127.08) 250+ ¥113.26 (¥124.59) 500+ ¥110.98 (¥122.08) 1000+ ¥107.22 (¥117.94) 2500+ ¥103.30 (¥113.63) 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	1.1V	5.5V	HVQFN	16Pins	I2C	-40°C	85°C	-	-

M41T94MQ6F	2806843 Data Sheet + RoHS	RTC, Date Time Format (Day/Date/Month/Year/Century, HH:MM:SS:hh), SPI, 2.7V to 5.5V Supply, SOIC-16 STMICROELECTRONICS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape	1+ ¥664.62 (¥731.08) 10+ ¥482.79 (¥531.07) 25+ ¥468.69 (¥515.56) 50+ ¥454.58 (¥500.04) 100+ ¥440.47 (¥484.52) 250+ ¥421.66 (¥463.83) 500+ ¥402.85 (¥443.14) 1000+ ¥388.74 (¥427.61) 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:hh	Alarm RTC	2.7V	5.5V	SOIC	16Pins	SPI	-40°C	85°C	-	-

M41T93RMY6F	2806839 Data Sheet + RoHS	RTC, Date Time Format (Day/Date/Month/Year/Century, HH:MM:SS:hh), SPI, 2.7V to 5.5V Supply, SOIC-18 STMICROELECTRONICS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape	1+ ¥777.48 (¥855.23) 10+ ¥547.06 (¥601.77) 25+ ¥530.34 (¥583.37) 50+ ¥513.62 (¥564.98) 100+ ¥496.90 (¥546.59) 250+ ¥471.82 (¥519.00) 500+ ¥457.71 (¥503.48) 1000+ ¥442.04 (¥486.24) 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:hh	Alarm RTC	2.7V	5.5V	SOIC	18Pins	SPI	-40°C	85°C	-	-

M48T35AV-10MH1F	2849939 Data Sheet + RoHS	RTC, Clock/Calendar, Date Time Format (YY-MM-DD-dd, HH:MM:SS), Parallel, 3V to 3.6V Supply, SOIC-28 STMICROELECTRONICS You previously purchased this product. View in Order History	Each	1+ ¥3,613.09 (¥3,974.40) 10+ ¥3,108.36 (¥3,419.20) 25+ ¥2,918.69 (¥3,210.56) 50+ ¥2,814.45 (¥3,095.90) 100+ ¥2,710.21 (¥2,981.23)	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	Calendar, Clock	3V	3.6V	SOIC	28Pins	Parallel	0°C	70°C	-	-

MCP7940MT-I/SN	2687514 Data Sheet + RoHS	Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 1.8 V to 5.5 V supply, SOIC-8 MICROCHIP You previously purchased this product. View in Order History	Each (Supplied on Full Reel) Full Reel Packaging Options Suggested replacement for:2687514 2901506 in Cut Tape	3300+ ¥92.49 (¥101.74) 9900+ ¥92.25 (¥101.48)	Restricted Item Minimum order of 3300 items Multiples of 3300 only Please enter a valid quantity Add Min: 3300 Mult: 3300	Day; Date; Month; Year	HH:MM:SS	Alarm RTC	1.8V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-

M41T81SMY6F	2806831 Data Sheet + RoHS	RTC, Date Time Format (Day/Date/Month/Year/Century, HH:MM:SS:hh), I2C, 2.7V to 5.5V Supply, SOIC-18 STMICROELECTRONICS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape	1+ ¥843.32 (¥927.65) 10+ ¥644.25 (¥708.68) 25+ ¥595.65 (¥655.22) 50+ ¥568.22 (¥625.04) 100+ ¥540.79 (¥594.87) 250+ ¥514.14 (¥565.55) 500+ ¥498.47 (¥548.32) 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:hh	Alarm RTC	2.7V	5.5V	SOIC	18Pins	I2C	-40°C	85°C	-	-

ISL1209IU10Z-TK	3265996 Data Sheet + RoHS	RTCC, -40 TO 85DEG C RENESAS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape	1+ ¥645.81 (¥710.39) 10+ ¥547.06 (¥601.77) 25+ ¥523.03 (¥575.33) 50+ ¥499.00 (¥548.90) 100+ ¥474.96 (¥522.46) 250+ ¥451.44 (¥496.58) 500+ ¥404.42 (¥444.86) 1000+ ¥338.58 (¥372.44) More Pricing...	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	2.7V	5.5V	MSOP	10Pins	I2C	-40°C	85°C	-	-

RV-2123-C2-TA-QC-020	2358506 Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year/Century 24Hr), SPI, 1.1 V to 5.5 V, SON-10 MICRO CRYSTAL You previously purchased this product. View in Order History	Each	1+ ¥1,147.58 (¥1,262.34) 10+ ¥858.97 (¥944.87) 25+ ¥769.27 (¥846.20) 50+ ¥724.69 (¥797.16)	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	24Hr	RTC	1.1V	5.5V	SON	10Pins	SPI	-40°C	85°C	-	-

MCP79410-I/MS	1823153 Data Sheet + RoHS	RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), I2C, Serial, 1.8 V to 5.5 V, MSOP-8 MICROCHIP You previously purchased this product. View in Order History	Each	1+ ¥224.85 (¥247.34) 25+ ¥195.91 (¥215.50) 100+ ¥175.87 (¥193.46)	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	MSOP	8Pins	I2C	-40°C	85°C	-	AEC-Q100

PCA2129T/Q900/2,51	2427480RL 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) Re-reel Packaging Options Suggested replacement for:2427480RL 2427480 in Cut Tape	null	Restricted Item	YYYY:MM:WK:DD:Hr:Min:Secs	Binary	Calendar, Clock	1.8V	4.2V	SOIC	16Pins	I2C, SPI	-40°C	85°C	-	-

M41T11M6F	2463678 Data Sheet + RoHS	RTC IC, Date Time Format (Date/Month/Year ss:mm:hh), I2C, 2 V to 5.5 V, SOIC-8 STMICROELECTRONICS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape	1+ ¥575.28 (¥632.81) 10+ ¥398.15 (¥437.97) 25+ ¥385.61 (¥424.17) 50+ ¥373.07 (¥410.38) 100+ ¥360.53 (¥396.58) 250+ ¥341.72 (¥375.89) 500+ ¥330.75 (¥363.83) 1000+ ¥322.66 (¥354.93) 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	ss:mm:hh	RTC	2V	5.5V	SOIC	8Pins	I2C	-40°C	85°C	-	-

X1B0002420001	2445807 Data Sheet + RoHS	RTC IC, Calendar, 1.6 V to 5.5 V, SOP, 8Pins, I2C EPSON You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape	1+ ¥635.97 (¥699.57) 10+ ¥556.47 (¥612.12) 25+ ¥461.08 (¥507.19) 50+ ¥413.38 (¥454.72) 100+ ¥381.58 (¥419.74) 250+ ¥356.14 (¥391.75) 1250+ ¥337.06 (¥370.77) 2500+ ¥327.28 (¥360.01) More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	Alarm RTC	1.6V	5.5V	SOP	8Pins	I2C	-40°C	85°C	-	-