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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 GST)	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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DS1337+	2518743 Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year ss:mm:hh), I2C, Serial, 1.8 V to 5.5 V, DIP-8 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ $6.80 ($7.48) 10+ $5.62 ($6.18) 50+ $5.32 ($5.85) 100+ $5.01 ($5.51) 250+ $4.75 ($5.23) 500+ $4.26 ($4.69) 2500+ $3.40 ($3.74) 5000+ $3.30 ($3.63) 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	ss:mm:hh	RTC	1.8V	5.5V	DIP	8Pins	I2C, Serial	-40°C	85°C	-	-
MCP7940M-I/MS	2098889 Data Sheet + RoHS	RTC IC, Date Time Format (Date/Month/Year hh:mm:ss), I2C, 1.8 V to 5.5 V, MSOP-8 MICROCHIP You previously purchased this product. View in Order History	Each	1+ $1.15 ($1.27) 25+ $1.08 ($1.19) 100+ $1.04 ($1.14)	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	MSOP	8Pins	I2C	-40°C	85°C	-	AEC-Q100
MCP79412T-I/MNY	2361123 Data Sheet + RoHS	Alarm RTC IC, Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr, I2C, 1.8 V to 5.5 V, TDFN-8 MICROCHIP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2361123 2361123RL in Re-reel	1+ $1.94 ($2.13)	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	TDFN	8Pins	I2C	-40°C	85°C	-	AEC-Q100
DS1388Z-33+	2515353 Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), I2C, 2.97 V to 3.63 V, NSOIC-8 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ $10.94 ($12.03) 10+ $9.69 ($10.66) 25+ $8.94 ($9.83) 100+ $8.18 ($9.00) 300+ $7.81 ($8.59) 500+ $7.13 ($7.84) 1000+ $6.06 ($6.67) 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	RTC	2.97V	3.63V	NSOIC	8Pins	I2C	-40°C	85°C	-	-
M48T58Y-70MH1F	2849896 Data Sheet + RoHS	RTC, Clock/Calendar, Date Time Format (YY-MM-DD-dd, HH:MM:SS), Parallel, 4.5V to 5.5V, SOIC-28 STMICROELECTRONICS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Cut Tape Packaging Options Suggested replacement for:2849896 2849896RL in Re-reel	1+ $25.97 ($28.57) 10+ $23.88 ($26.27) 25+ $22.89 ($25.18) 100+ $20.17 ($22.19) 250+ $19.18 ($21.10) 500+ $17.03 ($18.73) 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	Calendar, Clock	4.5V	5.5V	SOIC	28Pins	Parallel	0°C	70°C	-	-

DS1248Y-70+	2515444 Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), Bytewide, 4.5 V to 5.5 V, EDIP-32 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ $70.75 ($77.83) 10+ $65.63 ($72.19) 30+ $63.28 ($69.61) 100+ $54.07 ($59.48)	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	32Pins	Bytewide	0°C	70°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+ $8.46 ($9.31)	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	-	-

MCP79412T-I/MNY	2361123RL Data Sheet + RoHS	Alarm RTC IC, Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr, I2C, 1.8 V to 5.5 V, TDFN-8 MICROCHIP You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2361123RL 2361123 in Cut Tape	1+ $1.94 ($2.13)	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	12Hr / 24Hr	Alarm RTC	1.8V	5.5V	TDFN	8Pins	I2C	-40°C	85°C	-	AEC-Q100

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+ $53.70 ($59.07) 12+ $49.54 ($54.49) 36+ $47.31 ($52.04) 108+ $43.04 ($47.34)	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	-	-

M48T58Y-70MH1F	2849896RL Data Sheet + RoHS	RTC, Clock/Calendar, Date Time Format (YY-MM-DD-dd, HH:MM:SS), Parallel, 4.5V to 5.5V, SOIC-28 STMICROELECTRONICS You previously purchased this product. View in Order History	Each (Supplied on Cut Tape) Re-reel Packaging Options Suggested replacement for:2849896RL 2849896 in Cut Tape	10+ $23.88 ($26.27) 25+ $22.89 ($25.18) 100+ $20.17 ($22.19) 250+ $19.18 ($21.10) 500+ $17.03 ($18.73)	Restricted Item Minimum order of 10 items Multiples of 1 only Please enter a valid quantity Add Min: 10 Mult: 1	YY-MM-DD-dd	HH:MM:SS	Calendar, Clock	4.5V	5.5V	SOIC	28Pins	Parallel	0°C	70°C	-	-

DS12R885S-5+	2798721 Data Sheet + RoHS	RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), Bytewide, 4.5 V to 5.5 V supply, SOIC-24 ANALOG DEVICES You previously purchased this product. View in Order History	Each	1+ $7.70 ($8.47) 10+ $6.93 ($7.62) 30+ $6.55 ($7.21) 120+ $5.67 ($6.24) 270+ $5.38 ($5.92) 510+ $4.82 ($5.30) 1020+ $4.79 ($5.27) 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	SOIC	24Pins	Bytewide	-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+ $1.72 ($1.89) 25+ $1.70 ($1.87)	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+ $1.41 ($1.55) 25+ $1.32 ($1.45) 100+ $1.31 ($1.44)	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	-	-	-	-	-	-	-	-	-	-

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+ $2.26 ($2.49) 25+ $2.08 ($2.29) 100+ $2.06 ($2.27)	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+ $1.51 ($1.66) 25+ $1.47 ($1.62)	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+ $1.09 ($1.20) 10+ $1.08 ($1.19) 25+ $1.00 ($1.10) 100+ $0.995 ($1.09)	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+ $10.37 ($11.41) 10+ $9.32 ($10.25) 25+ $8.81 ($9.69) 100+ $7.64 ($8.40) 250+ $7.25 ($7.98) 500+ $6.50 ($7.15) 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	1.8V	4.2V	SOIC	16Pins	I2C, SPI	-40°C	85°C	-	-

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+ $8.78 ($9.66) 10+ $7.52 ($8.27) 50+ $7.48 ($8.23) 100+ $6.45 ($7.10) 250+ $6.12 ($6.73) 500+ $5.49 ($6.04) 1000+ $4.63 ($5.09) 2500+ $4.42 ($4.86) More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	-	-	-	-	-	-	-	-	-	-

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 Packaging Options Suggested replacement for:2515487 2515487RL in Re-reel	1+ $15.14 ($16.65) 10+ $13.67 ($15.04) 25+ $13.04 ($14.34) 100+ $11.33 ($12.46) 250+ $10.82 ($11.90) 500+ $9.87 ($10.86) 2500+ $8.70 ($9.57) 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 Packaging Options Suggested replacement for:2515464 2515464RL in Re-reel	1+ $7.73 ($8.50) 10+ $6.56 ($7.22) 25+ $6.13 ($6.74) 100+ $5.69 ($6.26) 250+ $5.39 ($5.93) 500+ $4.84 ($5.32) 3000+ $3.87 ($4.26) 6000+ $3.80 ($4.18) 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	µSOP	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+ $33.05 ($36.36) 14+ $30.38 ($33.42) 28+ $29.12 ($32.03) 112+ $25.66 ($28.23) 252+ $24.40 ($26.84) 504+ $22.82 ($25.10) 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	-	-

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+ $1.93 ($2.12) 500+ $1.70 ($1.87) 1000+ $1.42 ($1.56) 2500+ $1.20 ($1.32) 5000+ $1.19 ($1.31) 10000+ $1.15 ($1.27) More Pricing...	Restricted Item Minimum order of 100 items Multiples of 1 only Please enter a valid quantity Add Min: 100 Mult: 1	-	-	-	-	-	-	-	-	-	-	-	-

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+ $49.39 ($54.33) 12+ $46.46 ($51.11) 36+ $43.42 ($47.76) 108+ $38.29 ($42.12) 252+ $37.26 ($40.99)	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	-	-

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+ $17.61 ($19.37) 10+ $16.89 ($18.58) 46+ $15.52 ($17.07) 138+ $13.67 ($15.04) 276+ $13.35 ($14.69) 506+ $12.99 ($14.29) 1012+ $12.74 ($14.01) More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	-	-	-	-	-	-	-	-	-	-

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+ $2.60 ($2.86) 10+ $2.27 ($2.50) 100+ $1.93 ($2.12) 500+ $1.70 ($1.87) 1000+ $1.42 ($1.56) 2500+ $1.20 ($1.32) 5000+ $1.19 ($1.31) 10000+ $1.15 ($1.27) More Pricing...	Restricted Item Minimum order of 1 items Multiples of 1 only Please enter a valid quantity Add Min: 1 Mult: 1	-	-	-	-	-	-	-	-	-	-	-	-