RX-4571SA:B3 PURE SN Equivalent & Substitute Parts

Part Overview

The RX-4571SA:B3 PURE SN is an Active status Real Time Clock (RTC) IC manufactured by EPSON, designed for clock/calendar applications requiring 3-Wire Serial interface communication. This component provides timekeeping functionality with alarm and leap year support across a wide supply voltage range of 1.6V to 5.5V, with ultra-low timekeeping current consumption of 0.95µA to 1µA at 3V to 5V. The device is packaged in a 14-SOIC (0.209", 5.30mm Width) surface mount configuration and is ROHS3 compliant with unlimited moisture sensitivity rating.

Substitute parts become necessary when the original RX-4571SA:B3 PURE SN reaches end-of-life status, inventory constraints occur, or design requirements necessitate alternative interface protocols or enhanced feature sets while maintaining core timekeeping functionality.

Substiute Parts

RX-4571SA:B3 PURE SN

EPSONIn Stock: 1338RX-4571SA:B3 PURE SN Datasheet

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DS1305E+T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 5129DS1305E+T&R Datasheet

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DS1306EN+T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 5174DS1306EN+T&R Datasheet

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DS1343E-3+T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 2512DS1343E-3+T&R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the RX-4571SA:B3 PURE SN is determined by the following critical parameters:

Core Functional Requirements:

• Clock/Calendar timekeeping capability with alarm and leap year support
• Time format: HH:MM:SS (24 hr) and Date format: YY-MM-DD-dd compatibility
• Surface mount technology for PCB integration
• ROHS3 compliance and MSL 1 rating for manufacturing compatibility

Interface Consideration: The RX-4571SA:B3 PURE SN uses a 3-Wire Serial interface. The substitute parts listed (DS1305E+T&R, DS1306EN+T&R, DS1343E-3+T&R) employ SPI interface protocol, which represents a functional protocol change. These substitutes are valid alternatives when system design permits SPI interface implementation or when interface conversion is feasible.

Voltage and Temperature Compatibility: All substitute parts operate within overlapping supply voltage ranges (minimum 2V to maximum 5.5V) and support the extended operating temperature range of -40°C to 85°C, ensuring thermal and electrical compatibility in equivalent applications.

Package and Mounting: Substitute parts are packaged in 20-TSSOP (0.173", 4.40mm Width) surface mount configuration, requiring PCB layout modification from the original 14-SOIC footprint.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the original RX-4571SA:B3 PURE SN.

DS1306EN+T&R provides the closest thermal compatibility, supporting the full -40°C to 85°C operating temperature range matching the original part. This device includes Square Wave Output functionality and maintains SPI interface protocol.

DS1343E-3+T&R offers the lowest battery supply voltage floor at 1.3V, providing enhanced low-power battery backup capability. Operating temperature range extends to -40°C to 85°C, matching the original specification.

DS1305E+T&R operates within a reduced temperature range of 0°C to 70°C, limiting applicability to commercial-grade thermal environments. This part is suitable for applications not requiring extended low-temperature operation.

All substitute parts incorporate non-volatile memory (NVSRAM or NVRAM) and trickle-charger functionality, providing enhanced feature sets beyond the original RX-4571SA:B3 PURE SN specification.

Frequently Asked Questions (FAQ)

Q: Can DS1305E+T&R, DS1306EN+T&R, and DS1343E-3+T&R be used interchangeably with RX-4571SA:B3 PURE SN?

A: These parts share core clock/calendar functionality, alarm, and leap year support. However, interface protocol differs: the original uses 3-Wire Serial while substitutes employ SPI. PCB layout modification is required due to package change from 14-SOIC to 20-TSSOP. Firmware or microcontroller interface code must be adapted for SPI protocol compatibility.

Q: What are the key differences in operating temperature ranges?

A: RX-4571SA:B3 PURE SN and DS1306EN+T&R and DS1343E-3+T&R support -40°C to 85°C. DS1305E+T&R operates only within 0°C to 70°C, restricting use in extended temperature applications.

Q: How do supply voltage ranges compare?

A: RX-4571SA:B3 PURE SN operates from 1.6V to 5.5V. DS1305E+T&R and DS1306EN+T&R require minimum 2V. DS1343E-3+T&R requires minimum 2.7V main supply but supports battery operation down to 1.3V, offering superior low-power backup capability.

Q: What is the impact of timekeeping current consumption differences?

A: RX-4571SA:B3 PURE SN draws 0.95µA to 1µA. DS1305E+T&R and DS1306EN+T&R draw 25.3µA to 81µA, representing significantly higher power consumption. Battery backup runtime will be reduced proportionally in low-power applications.

Q: Are all parts ROHS3 compliant and MSL 1 rated?

A: Yes. All parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring manufacturing process compatibility and long-term storage capability.

Q: What package considerations apply to substitution?

A: Original part uses 14-SOIC (0.209", 5.30mm Width). All substitutes use 20-TSSOP (0.173", 4.40mm Width). PCB footprint redesign is mandatory. Pin count increases from 14 to 20, requiring schematic and layout modifications.