RA-8565SA:B3 PURE SN Real Time Clock (RTC) IC Equivalent & Substitute Parts

Part Overview

The RA-8565SA:B3 PURE SN is a Real Time Clock (RTC) IC manufactured by EPSON, designed for clock/calendar applications with I2C interface. This 14-SOIC package device provides time and date tracking with alarm functionality across a wide supply voltage range of 1.8V to 5.5V. The product is currently listed as obsolete, making equivalent and substitute parts essential for ongoing design support, production continuity, and system maintenance. Substitute parts must maintain functional compatibility through matching interface protocols, time/date format support, and operating parameter ranges.

Key Parameters

Parameter	RA-8565SA:B3 PURE SN
Manufacturer	EPSON
Type	Clock/Calendar
Interface	I2C
Time Format	HH:MM:SS
Date Format	YY-MM-DD-dd
Features	Alarm
Voltage Supply Range	1.8V ~ 5.5V
Current - Timekeeping (Max)	1µA ~ 1.8µA @ 3V ~ 5V
Operating Temperature	-40°C ~ 125°C
Package	14-SOIC (0.197", 5.00mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the RA-8565SA:B3 PURE SN are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Interface Protocol: I2C (2-Wire Serial) compatibility required
Time Format: HH:MM:SS support mandatory
Date Format: YY-MM-DD-dd support mandatory
Voltage Supply Range: Minimum overlap with 1.8V ~ 5.5V range
Features: Alarm functionality required
Mounting Type: Surface Mount only
RoHS Compliance: ROHS3 Compliant

Secondary Considerations:

Operating Temperature Range: Extended range (-40°C ~ 125°C) preferred but -40°C ~ 85°C acceptable
Package Type: Mechanical and electrical compatibility with PCB layout
Current Consumption: Lower timekeeping current preferred for battery-backed applications
Product Status: Active status preferred for long-term availability

Substitute parts are grouped by package type and feature set to facilitate direct replacement or design adaptation scenarios.

Parameter Comparison

Part Number	Manufacturer	Interface	Time Format	Date Format	Voltage Supply	Operating Temp	Package	Features	Product Status	RoHS
RA-8565SA:B3 PURE SN	EPSON	I2C	HH:MM:SS	YY-MM-DD-dd	1.8V ~ 5.5V	-40°C ~ 125°C	14-SOIC	Alarm	Obsolete	ROHS3
1337DVGI8	Renesas Electronics	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Alarm, Leap Year, Square Wave Output	Active	ROHS3
1337GDCGI8	Renesas Electronics	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Alarm, Leap Year, Square Wave Output	Active	ROHS3
AB0805-T3	Abracon LLC	I2C, 2-Wire Serial	HH:MM:SS:hh	YY-MM-DD-dd	1.7V ~ 3.6V	-40°C ~ 85°C	16-VFQFN	Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog Timer	Active	ROHS3
BQ32000D	Texas Instruments	I2C, 2-Wire Serial	HH:MM:SS (24 hr)	YY-MM-DD-dd	3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Leap Year, Square Wave Output, Trickle-Charger	Active	ROHS3
DS1307Z+T&R	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	4.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3
DS1308U-18+T	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	1.71V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3
DS1308U-3+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	2.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3
DS1338C-33#	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3
DS1338Z-3+T&R	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	2.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3
DS1339C-33#T&R	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	2.97V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Active	ROHS3

Engineering Selection Recommendations

For Direct Package Replacement (14-SOIC to 8-SOIC/8-TSSOP):

The Renesas 1337GDCGI8 (8-SOIC) and 1337DVGI8 (8-TSSOP) provide the closest functional match with full voltage range compatibility (1.8V ~ 5.5V), matching time/date formats, and alarm functionality. Both devices are in active production status with ROHS3 compliance. The 8-SOIC package requires minimal PCB layout modification compared to the original 14-SOIC footprint.

For Extended Temperature Range Applications:

The RA-8565SA:B3 PURE SN operates to 125°C. No substitute parts in the provided list maintain this extended upper temperature limit. Applications requiring -40°C ~ 125°C operation require design review and potential thermal management modifications. The DS1308U-18+T and DS1308U-3+ support -40°C ~ 85°C with wide voltage range (1.71V ~ 5.5V and 2.7V ~ 5.5V respectively).

For Low-Voltage Applications (1.8V ~ 3.6V):

The Abracon AB0805-T3 operates at 1.7V ~ 3.6V with enhanced features including SRAM, trickle-charger, and watchdog timer. This 16-VFQFN package requires significant PCB redesign but provides superior integration for battery-backed systems.

For Standard Industrial Applications (3V ~ 5.5V):

The Analog Devices DS1338Z-3+T&R (8-SOIC) and DS1339C-33#T&R (16-SOIC) offer proven reliability with NVSRAM, alarm capability (DS1339 only), and active production status. Both support -40°C ~ 85°C operating range and full I2C protocol compatibility.

For Cost-Optimized Designs:

The Texas Instruments BQ32000D (8-SOIC) provides trickle-charger functionality at 3V ~ 3.6V supply range. This device is suitable for applications where the lower voltage range is acceptable and cost optimization is prioritized.

All recommended substitutes maintain ROHS3 compliance and active production status, ensuring long-term component availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the RA-8565SA:B3 PURE SN be directly replaced with a smaller package substitute?

A: Yes, with PCB layout modifications. The original 14-SOIC package can be replaced with 8-SOIC or 8-TSSOP alternatives (1337GDCGI8, 1337DVGI8, DS1338Z-3+T&R, DS1308U-18+T). These maintain I2C interface compatibility and matching time/date formats. Verify pin assignments and signal routing before implementation.

Q: Which substitute part best matches the original operating temperature range?

A: No substitute part matches the original -40°C ~ 125°C range. The RA-8565SA:B3 PURE SN has an extended upper temperature limit of 125°C, while all substitutes max out at 85°C. For applications requiring extended temperature operation, design review and thermal analysis are necessary.

Q: Are all substitute parts I2C compatible with the original design?

A: Yes. All listed substitute parts use I2C (2-Wire Serial) interface protocol. However, verify specific I2C address assignments and register map compatibility with your firmware implementation, as some devices may have different default addresses or feature sets.

Q: What is the voltage supply compatibility range for substitution?

A: The original RA-8565SA:B3 PURE SN operates at 1.8V ~ 5.5V. Substitute parts with overlapping ranges include: 1337DVGI8 (1.8V ~ 5.5V), 1337GDCGI8 (1.8V ~ 5.5V), DS1308U-18+T (1.71V ~ 5.5V), and DS1308U-3+ (2.7V ~ 5.5V). For applications using the full 1.8V minimum, only the Renesas parts and DS1308U-18+T are suitable.

Q: Does the AB0805-T3 provide a direct replacement?

A: No. The AB0805-T3 operates at 1.7V ~ 3.6V, which does not cover the original 5.5V upper limit. Additionally, the 16-VFQFN package requires significant PCB redesign. This part is suitable only for low-voltage battery-backed applications where the voltage range is acceptable.

Q: Which substitute parts include alarm functionality like the original?

A: The 1337DVGI8, 1337GDCGI8, and DS1339C-33#T&R include alarm features matching the original RA-8565SA:B3 PURE SN. Other substitutes (DS1307, DS1308, DS1338) do not include alarm functionality.

Q: What is the impact of switching from 14-SOIC to 8-SOIC packaging?

A: The 8-SOIC package is physically smaller (0.154" width vs. 0.197" width) and has fewer pins (8 vs. 14). PCB layout must be redesigned to accommodate the new footprint. Verify that all required signals are available on the 8-pin package and that unused pins on the original device are not critical to your application.

Q: Are all substitute parts in active production?

A: Yes. All listed substitute parts have active product status, ensuring long-term availability and supply chain continuity. The original RA-8565SA:B3 PURE SN is obsolete, making active substitutes essential for new designs and production support.

Q: Do all substitutes support both 12-hour and 24-hour time formats?

A: Most substitutes support both 12-hour and 24-hour formats (1337DVGI8, 1337GDCGI8, DS1307, DS1308, DS1338, DS1339). The BQ32000D supports 24-hour format only. Verify your firmware requirements before selection.

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