RX-8025SA:AA0:ROHS Equivalent & Substitute Parts

Part Overview

The RX-8025SA:AA0:ROHS is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by EPSON. This device integrates I2C (2-Wire Serial) interface for time and date management with alarm capabilities and leap year support. The part operates across a wide supply voltage range of 1.7V to 5.5V with ultra-low timekeeping current consumption of 1.2µA to 1.8µA at 3V to 5V. Housed in a 14-SOIC (0.209", 5.30mm Width) surface mount package, the RX-8025SA:AA0:ROHS is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

The RX-8025SA:AA0:ROHS is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring RTC functionality with I2C interface compatibility.

Key Parameters

Parameter	RX-8025SA:AA0:ROHS
Manufacturer	EPSON
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Features	Alarm, Leap Year
Voltage - Supply	1.7V ~ 5.5V
Current - Timekeeping (Max)	1.2µA ~ 1.8µA @ 3V ~ 5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the RX-8025SA:AA0:ROHS is determined by the following critical parameters:

Interface Compatibility: I2C (2-Wire Serial) interface is mandatory for direct substitution
Time/Date Format: HH:MM:SS (12/24 hr) and YY-MM-DD-dd format support required
Operating Temperature Range: Must support -40°C to 85°C minimum
Supply Voltage Range: Must accommodate the 1.7V to 5.5V operating window or a subset thereof
Mounting Type: Surface mount technology required for PCB compatibility
RoHS Compliance: ROHS3 compliance required for regulatory alignment
Core Features: Alarm and Leap Year support required

Substitute parts are grouped into two categories based on package form factor:

Group 1 - Compact Surface Mount (8-pin packages): DS1338U-18+T&R, DS1338U-33+, DS1339U-2+, DS1339U-2+T&R, DS1339U-33+, DS1339U-33+T&R, 1338-31DCGI. These parts offer reduced footprint with 8-SOIC, 8-TSSOP, or 8-MSOP packages while maintaining I2C interface and core RTC functionality.

Group 2 - Through-Hole and Larger Surface Mount: DS1307+, DS1307Z+, ISL12020MIRZ-T7A. These parts provide alternative package options with enhanced memory or additional features while maintaining I2C interface compatibility.

Parameter Comparison

Parameter	RX-8025SA:AA0:ROHS	1338-31DCGI	DS1307+	DS1307Z+	DS1338U-18+T&R	DS1338U-33+	DS1339U-2+	DS1339U-2+T&R	DS1339U-33+	DS1339U-33+T&R	ISL12020MIRZ-T7A
Type	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar
Interface	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial
Time Format	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
Features	Alarm, Leap Year	Leap Year, NVSRAM, Square Wave Output	Leap Year, NVSRAM, Square Wave Output	Leap Year, NVSRAM, Square Wave Output	Leap Year, NVSRAM, Square Wave Output	Leap Year, NVSRAM, Square Wave Output	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Alarm, Daylight Savings, Leap Year, SRAM
Voltage - Supply	1.7V ~ 5.5V	3.3V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	1.71V ~ 5.5V	3V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	2.97V ~ 5.5V	2.97V ~ 5.5V	2.7V ~ 5.5V
Current - Timekeeping (Max)	1.2µA ~ 1.8µA @ 3V ~ 5V	5µA @ 3.63V ~ 5.5V	200µA @ 5V	200µA @ 5V	100µA @ 1.89V	125µA ~ 200µA @ 3.63V ~ 5.5V	100µA @ 2.2V	100µA @ 2.2V	200µA @ 5.5V	200µA @ 5.5V	14µA ~ 15µA @ 3V ~ 5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-SOIC (0.209", 5.30mm Width)	8-SOIC (0.154", 3.90mm Width)	8-DIP (0.300", 7.62mm)	8-SOIC (0.154", 3.90mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	20-PowerLFDFN
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and are classified as active products, ensuring ongoing availability and regulatory alignment. Selection among substitutes depends on specific design constraints:

For applications requiring extended low-voltage operation (1.7V minimum): DS1338U-18+T&R provides the closest voltage range match to the RX-8025SA:AA0:ROHS with 1.71V minimum supply voltage and operates across the full -40°C to 85°C temperature range. This part is available in Tape & Reel packaging.

For applications prioritizing ultra-low timekeeping current: ISL12020MIRZ-T7A delivers 14µA to 15µA timekeeping current at 3V to 5V, superior to the RX-8025SA:AA0:ROHS specification. This part includes additional features such as Daylight Savings support and 128B SRAM memory, with active product status and full temperature range support.

For applications with standard 3V to 5.5V supply requirements: DS1339U-33+T&R or DS1339U-33+ offer alarm functionality matching the RX-8025SA:AA0:ROHS feature set, with trickle-charger capability and active product status. The Tape & Reel variant (DS1339U-33+T&R) provides 22,908 units in stock inventory.

For applications accepting reduced operating temperature range (0°C to 70°C): DS1307+ and DS1307Z+ are viable alternatives with established market presence and high inventory availability (3,067 and 2,140 units respectively). DS1307Z+ maintains surface mount form factor compatibility.

For compact PCB layouts requiring minimal footprint: 1338-31DCGI, DS1338U-18+T&R, DS1338U-33+, DS1339U-2+, DS1339U-2+T&R, DS1339U-33+, and DS1339U-33+T&R all utilize 8-pin packages (8-SOIC or 8-TSSOP/8-MSOP) compared to the 14-pin SOIC of the original part, reducing board space requirements.

Frequently Asked Questions (FAQ)

Q: Can DS1307+ directly replace RX-8025SA:AA0:ROHS in existing designs?

A: DS1307+ maintains I2C interface, time/date format, and leap year support compatibility. However, it operates at 0°C to 70°C (versus -40°C to 85°C for RX-8025SA:AA0:ROHS) and requires 4.5V minimum supply voltage (versus 1.7V for RX-8025SA:AA0:ROHS). Through-hole mounting (8-DIP) differs from the original surface mount package. Substitution is valid only for applications within the reduced temperature and voltage specifications.

Q: What is the primary advantage of DS1338U-18+T&R over other substitutes?

A: DS1338U-18+T&R provides the widest supply voltage range (1.71V to 5.5V) among all substitutes, closely matching the RX-8025SA:AA0:ROHS specification of 1.7V to 5.5V. It maintains full -40°C to 85°C operating temperature range and I2C interface compatibility. Tape & Reel packaging supports high-volume production requirements.

Q: Are package form factor differences significant for substitution?

A: Yes. The RX-8025SA:AA0:ROHS uses 14-SOIC (0.209", 5.30mm Width) package. Substitutes employ 8-pin packages (8-SOIC, 8-TSSOP, 8-MSOP, 8-DIP, or 20-PowerLFDFN). PCB layout redesign is required for any substitute. Pin-to-pin functional mapping must be verified against device datasheets before implementation.

Q: Which substitute offers the lowest timekeeping current consumption?

A: ISL12020MIRZ-T7A specifies 14µA to 15µA timekeeping current at 3V to 5V, compared to 1.2µA to 1.8µA for RX-8025SA:AA0:ROHS. While higher in absolute terms, ISL12020MIRZ-T7A remains suitable for battery-backed applications and includes additional features such as Daylight Savings support and 128B SRAM.

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

A: Yes. All listed substitutes support HH:MM:SS (12/24 hr) time format and YY-MM-DD-dd date format, matching RX-8025SA:AA0:ROHS specifications.

Q: What is the inventory status for high-volume procurement?

A: DS1339U-33+T&R offers the highest inventory availability with 22,908 units in stock. DS1307+ (3,067 units), ISL12020MIRZ-T7A (3,641 units), and DS1339U-2+ (3,792 units) provide substantial stock levels for production requirements. Smaller quantities are available for other variants.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, ensuring regulatory alignment with the original RX-8025SA:AA0:ROHS specification.

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