RTC-8564JE:ROHS Equivalent & Substitute Parts

Part Overview

The RTC-8564JE:ROHS is a Real Time Clock (RTC) IC with Clock/Calendar functionality, featuring I2C 2-Wire Serial interface in a 20-LSSOJ surface mount package. This EPSON component provides timekeeping with alarm and Y2K capabilities across a 1.8V to 5.5V supply range, operating from -40°C to 85°C. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	EPSON
Part Number	RTC-8564JE:ROHS
Product Category	Clock/Timing - Real Time Clock (RTC)
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Package / Case	20-LSSOJ (0.213", 5.40mm Width)
Voltage - Supply	1.8V ~ 5.5V
Current - Timekeeping (Max)	0.7µA ~ 0.8µA @ 3V ~ 5V
Operating Temperature	-40°C ~ 85°C
Time Format	HH:MM:SS
Date Format	YY-MM-DD-dd
Features	Alarm, Y2K
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the RTC-8564JE:ROHS is determined by the following critical parameters:

Interface Compatibility: All substitute parts must support I2C 2-Wire Serial communication to maintain firmware and circuit compatibility.

Voltage Supply Range: The supply voltage range must overlap with or encompass the 1.8V to 5.5V specification. Parts with narrower ranges (such as 3V to 3.6V) are acceptable only if the application operates within that subset.

Operating Temperature Range: All substitutes must support the full -40°C to 85°C operating range.

Time and Date Format: Substitutes must support HH:MM:SS time format and YY-MM-DD-dd date format.

Functional Features: Alarm and calendar functionality are required. Additional features such as leap year detection, square wave output, or watchdog timer do not disqualify a part but represent enhanced capability.

RoHS Compliance: All substitutes must maintain ROHS3 compliance for regulatory continuity.

Package Considerations: While the original part uses a 20-LSSOJ package, substitute parts may use alternative surface mount packages (8-TSSOP, 8-SOIC, 8-WCDFN, 16-SOIC) provided the application PCB layout can accommodate the different footprint and pin configuration.

Parameter Comparison

Part Number	Manufacturer	Package	Voltage Supply	Interface	Time Format	Date Format	Features	Operating Temp	RoHS Status	Product Status
RTC-8564JE:ROHS	EPSON	20-LSSOJ	1.8V ~ 5.5V	I2C, 2-Wire	HH:MM:SS	YY-MM-DD-dd	Alarm, Y2K	-40°C ~ 85°C	ROHS3	Obsolete
RTC-8564JE:B3:ROHS	EPSON	20-LSSOJ	1.8V ~ 5.5V	I2C, 2-Wire	HH:MM:SS	YY-MM-DD-dd	Alarm, Y2K	-40°C ~ 85°C	ROHS3	Active
1337DVGI8	Renesas Electronics	8-TSSOP	1.8V ~ 5.5V	I2C, 2-Wire	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave	-40°C ~ 85°C	ROHS3	Active
AB-RTCMC-32.768KHZ-AIGZ-S7-T	Abracon LLC	8-WCDFN	1V ~ 4.4V	I2C, 2-Wire	HH:MM:SS:hh (24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Watchdog Timer	-40°C ~ 85°C	ROHS3	Active
BQ32002DR	Texas Instruments	8-SOIC	3V ~ 3.6V	I2C, 2-Wire	HH:MM:SS (24 hr)	YY-MM-DD-dd	Leap Year, Square Wave, Trickle-Charger	-40°C ~ 85°C	ROHS3	Active
DS1337U+	Analog Devices Inc./Maxim	8-TSSOP	1.8V ~ 5.5V	I2C, 2-Wire	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave	-40°C ~ 85°C	ROHS3	Active
DS1338C-3#	Analog Devices Inc./Maxim	16-SOIC	2.7V ~ 5.5V	I2C, 2-Wire	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Leap Year, NVSRAM, Square Wave	-40°C ~ 85°C	ROHS3	Active
DS1338Z-18+T&R	Analog Devices Inc./Maxim	8-SOIC	1.71V ~ 5.5V	I2C, 2-Wire	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Leap Year, NVSRAM, Square Wave	-40°C ~ 85°C	ROHS3	Active
DS1338Z-3+	Analog Devices Inc./Maxim	8-SOIC	2.7V ~ 5.5V	I2C, 2-Wire	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Leap Year, NVSRAM, Square Wave	-40°C ~ 85°C	ROHS3	Active
DS1339BU+T	Analog Devices Inc./Maxim	8-TSSOP	1.71V ~ 5.5V	I2C, 2-Wire	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave, Trickle-Charger	-40°C ~ 85°C	ROHS3	Active
DS1339U-33+	Analog Devices Inc./Maxim	8-TSSOP	2.97V ~ 5.5V	I2C, 2-Wire	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave, Trickle-Charger	-40°C ~ 85°C	ROHS3	Active

Engineering Selection Recommendations

Primary Substitute (Direct Replacement): RTC-8564JE:B3:ROHS is the direct equivalent of the obsolete RTC-8564JE:ROHS. This part maintains identical electrical specifications, package footprint, and pinout while offering active product status and higher inventory availability (11,962 units in stock versus 787 units for the original).

Package-Compatible Substitutes: Parts using 8-pin surface mount packages (8-TSSOP, 8-SOIC, 8-WCDFN) require PCB layout redesign but offer active product status and enhanced feature sets. These include DS1337U+, DS1338Z series, and DS1339 variants from Analog Devices Inc./Maxim Integrated, as well as the Renesas 1337DVGI8.

Voltage Range Considerations: The BQ32002DR from Texas Instruments operates within a narrower voltage range (3V to 3.6V) and is suitable only for applications that do not require the full 1.8V to 5.5V supply range of the original part. The AB-RTCMC-32.768KHZ-AIGZ-S7-T from Abracon LLC operates from 1V to 4.4V, which does not fully encompass the original 5.5V maximum.

Compliance Status: All listed substitutes maintain ROHS3 compliance and operate across the full -40°C to 85°C temperature range, ensuring regulatory and environmental consistency with the original design.

Frequently Asked Questions (FAQ)

Q: Can I use RTC-8564JE:B3:ROHS as a direct replacement for RTC-8564JE:ROHS?

A: Yes. RTC-8564JE:B3:ROHS is functionally and electrically identical to the obsolete RTC-8564JE:ROHS. The primary difference is packaging format (Tape & Reel versus bulk) and active product status. No circuit modifications are required.

Q: What is the main limitation when substituting with 8-pin packages like DS1337U+ or 1337DVGI8?

A: The original RTC-8564JE:ROHS uses a 20-pin LSSOJ package, while these alternatives use 8-pin packages (8-TSSOP or 8-SOIC). This requires PCB layout redesign and verification of pin-to-function mapping. However, all maintain I2C 2-Wire Serial interface compatibility and the required voltage, temperature, and functional specifications.

Q: Is the BQ32002DR suitable for all applications using RTC-8564JE:ROHS?

A: No. The BQ32002DR operates within a 3V to 3.6V supply range, which is narrower than the original part's 1.8V to 5.5V range. Use this part only if your application operates exclusively within the 3V to 3.6V window.

Q: Do all substitute parts support the same time and date formats?

A: All listed substitutes support HH:MM:SS time format and YY-MM-DD-dd date format, maintaining compatibility with firmware expecting these formats. Some parts offer 12/24-hour selectable time format, which is a superset of the original 24-hour format.

Q: What is the significance of the Alarm and Y2K features in the original part?

A: These features are core to the RTC-8564JE:ROHS functionality. All substitute parts listed support Alarm functionality. Y2K compliance is implicit in the YY-MM-DD-dd date format supported by all substitutes. When selecting alternatives, confirm that your application firmware is compatible with the specific alarm interrupt behavior of the chosen substitute.

Q: Are there inventory or lead-time advantages to choosing specific substitutes?

A: Yes. RTC-8564JE:B3:ROHS has 11,962 units in stock, DS1338Z-18+T&R has 9,745 units, and AB-RTCMC-32.768KHZ-AIGZ-S7-T has 84,205 units. These represent significantly higher availability than the original obsolete part (787 units). Consult current inventory data for real-time availability.

Q: What additional features do some substitutes offer beyond the original part?

A: Several substitutes include Leap Year detection, Square Wave Output, Watchdog Timer, Trickle-Charger, or NVSRAM (Non-Volatile Static RAM). These are enhancements that do not conflict with the original design but may require firmware modifications to utilize. If your application does not require these features, they do not impact compatibility.

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