RTC-8564JE:BB Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The RTC-8564JE:BB is an EPSON Real Time Clock (RTC) IC with integrated clock/calendar functionality, I2C interface, and low-power timekeeping capability. This 20-pin surface mount device operates across a wide supply voltage range (1.8V to 5.5V) and maintains extremely low current consumption during timekeeping mode (0.7µA to 0.8µA at 3V to 5V). The device is ROHS3 compliant and currently in active production status with 927 units in stock.

Equivalent and substitute parts are identified based on matching functional requirements: Clock/Calendar type, I2C/2-Wire Serial interface, compatible operating temperature range (-40°C to 85°C), and ROHS3 compliance. Substitutes must support the same time format (HH:MM:SS) and date format (YY-MM-DD-dd) specifications.

Key Parameters

Parameter	RTC-8564JE:BB
Manufacturer	EPSON
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C
Time Format	HH:MM:SS
Date Format	YY-MM-DD-dd
Voltage Supply Range	1.8V ~ 5.5V
Current - Timekeeping (Max)	0.7µA ~ 0.8µA @ 3V ~ 5V
Operating Temperature	-40°C ~ 85°C
Package / Case	20-LSSOJ (0.213", 5.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Interface type: I2C or 2-Wire Serial (compatible with RTC-8564JE:BB I2C interface)
Time format: HH:MM:SS support (12/24 hour or 24 hour formats acceptable)
Date format: YY-MM-DD-dd support
Operating temperature range: -40°C to 85°C minimum
RoHS compliance: ROHS3 Compliant
Product status: Active

Secondary Compatibility Factors:

Supply voltage overlap with 1.8V ~ 5.5V range
Mounting type: Surface Mount
Package classification: 8-SOIC, 8-TSSOP/8-MSOP, 16-SOIC, or module form factors

Substitutes are organized by package type and electrical characteristics. Parts with narrower voltage ranges or higher timekeeping current consumption remain functionally compatible within their specified operating conditions.

Parameter Comparison

Part Number	Manufacturer	Interface	Time Format	Date Format	Voltage Supply	Current - Timekeeping (Max)	Operating Temp	Package / Case	RoHS Status
RTC-8564JE:BB	EPSON	I2C	HH:MM:SS	YY-MM-DD-dd	1.8V ~ 5.5V	0.7µA ~ 0.8µA @ 3V ~ 5V	-40°C ~ 85°C	20-LSSOJ (5.40mm)	ROHS3
1339-31DCGI	Renesas Electronics	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	3.3V ~ 5.5V	200µA @ 3.63V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	ROHS3
AB-RTCMC-32.768KHZ-B5ZE-S3-T	Abracon LLC	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	1.2V ~ 5.5V	0.5µA @ 2V ~ 5V	-40°C ~ 85°C	10-SMD Module	ROHS3
BQ32002D	Texas Instruments	I2C, 2-Wire Serial	HH:MM:SS (24 hr)	YY-MM-DD-dd	3V ~ 3.6V	200µA @ 3.3V	-40°C ~ 85°C	8-SOIC (3.90mm)	ROHS3
DS1308U-3+T	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	2.7V ~ 5.5V	Not specified	-40°C ~ 85°C	8-TSSOP, 8-MSOP (3.00mm)	ROHS3
DS1308U-33+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	3V ~ 5.5V	125µA ~ 200µA @ 3V ~ 5.5V	-40°C ~ 85°C	8-TSSOP, 8-MSOP (3.00mm)	ROHS3
DS1337S+T&R	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	1.8V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	8-SOIC (3.90mm)	ROHS3
DS1338C-33#T&R	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	3V ~ 5.5V	125µA ~ 200µA @ 3.63V ~ 5.5V	-40°C ~ 85°C	16-SOIC (7.50mm)	ROHS3
DS1340C-3#	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	HH:MM:SS (24 hr)	YY-MM-DD-dd	2.7V ~ 5.5V	125µA @ 3.3V	-40°C ~ 85°C	16-SOIC (7.50mm)	ROHS3
DS1342U+T&R	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	1.8V ~ 5.5V	0.6µA ~ 0.7µA @ 3V ~ 5V	-40°C ~ 85°C	8-TSSOP, 8-MSOP (3.00mm)	ROHS3
DS1388Z-5+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	HH:MM:SS:hh (12/24 hr)	YY-MM-DD-dd	4.5V ~ 5.5V	270µA @ 4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, meeting baseline regulatory and supply chain requirements.

Low-Power Applications (Timekeeping Current ≤ 1µA): DS1337S+T&R and DS1342U+T&R deliver timekeeping current of 0.6µA to 0.7µA, matching the RTC-8564JE:BB performance envelope. DS1337S+T&R supports the full 1.8V to 5.5V supply range identical to the main part. DS1342U+T&R offers equivalent low-power characteristics in 8-TSSOP/8-MSOP package.

Wide Supply Voltage Range (1.8V ~ 5.5V): DS1337S+T&R and DS1342U+T&R maintain full voltage compatibility with RTC-8564JE:BB across the entire 1.8V to 5.5V range. AB-RTCMC-32.768KHZ-B5ZE-S3-T extends the lower limit to 1.2V, providing additional margin for low-voltage applications.

Standard Operating Conditions (3V ~ 5.5V): 1339-31DCGI, BQ32002D, DS1308U-33+, DS1338C-33#T&R, and DS1340C-3# operate within the 3V to 5.5V range with higher timekeeping current consumption (125µA to 200µA). These parts are suitable for applications where power consumption is not the primary constraint.

Package Considerations: The RTC-8564JE:BB uses a 20-pin LSSOJ package. Substitute parts employ smaller packages (8-SOIC, 8-TSSOP/8-MSOP, 16-SOIC, or module form factors), requiring PCB layout redesign. Package selection depends on available board space and thermal management requirements.

Specialized Features: DS1388Z-5+ includes 512B EEPROM, supervisor, watchdog timer, and trickle-charger functionality. This part operates at 4.5V to 5.5V only and draws 270µA during timekeeping, making it suitable for applications requiring extended memory and system monitoring rather than low-power operation.

Frequently Asked Questions (FAQ)

Q: Can DS1337S+T&R directly replace RTC-8564JE:BB in a 1.8V to 5.5V application?

A: DS1337S+T&R is functionally compatible. Both parts support I2C interface, HH:MM:SS time format, YY-MM-DD-dd date format, -40°C to 85°C operating temperature, and ROHS3 compliance. DS1337S+T&R delivers 0.6µA timekeeping current at 1.3V to 1.8V, meeting low-power requirements. However, the package differs (8-SOIC vs. 20-LSSOJ), requiring PCB redesign.

Q: Which substitute offers the lowest timekeeping current consumption?

A: AB-RTCMC-32.768KHZ-B5ZE-S3-T consumes 0.5µA at 2V to 5V, the lowest among all listed substitutes. DS1337S+T&R and DS1342U+T&R follow at 0.6µA to 0.7µA. The RTC-8564JE:BB itself consumes 0.7µA to 0.8µA at 3V to 5V.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status, matching the RTC-8564JE:BB compliance level.

Q: What is the impact of package size differences?

A: The RTC-8564JE:BB uses a 20-pin LSSOJ package (5.40mm width). Substitutes employ 8-pin (3.90mm or 3.00mm width), 16-pin (7.50mm width), or module packages. Smaller packages reduce PCB footprint but require circuit redesign, signal routing adjustments, and potential changes to supporting component placement.

Q: Can BQ32002D substitute for RTC-8564JE:BB in a 1.8V application?

A: No. BQ32002D operates at 3V to 3.6V supply voltage only. It cannot function at 1.8V. Use DS1337S+T&R, DS1342U+T&R, or AB-RTCMC-32.768KHZ-B5ZE-S3-T for 1.8V compatibility.

Q: Which substitute supports 12-hour time format?

A: DS1308U-3+T, DS1308U-33+, DS1337S+T&R, DS1338C-33#T&R, DS1342U+T&R, and DS1388Z-5+ all support 12/24-hour time format selection. BQ32002D and DS1340C-3# support 24-hour format only.

Q: Is DS1388Z-5+ suitable for battery-backed timekeeping?

A: DS1388Z-5+ supports battery supply voltage of 1.3V to 5.5V and includes trickle-charger functionality. However, it requires 4.5V to 5.5V main supply voltage and draws 270µA during timekeeping, making it less suitable for ultra-low-power battery backup applications compared to DS1337S+T&R or DS1342U+T&R.

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