RX-4575LC:B Equivalent & Substitute Parts

Part Overview

The RX-4575LC:B is a Real Time Clock (RTC) IC manufactured by EPSON, designed for clock/calendar applications with 3-wire serial interface capability. This component operates across a wide voltage range (1.6V to 5.5V) and maintains extremely low power consumption during timekeeping mode (0.7µA to 0.9µA at 3V to 5V). The RX-4575LC:B is classified as obsolete, making identification of functionally equivalent substitute components essential for ongoing system support, redesign initiatives, and inventory management.

Substiute Parts

RX-4575LC:B

EPSONIn Stock: 694RX-4575LC:B Datasheet

Current PartRFQ

DS1302SN+

Analog Devices Inc./Maxim IntegratedIn Stock: 1147DS1302SN+ Datasheet

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DS1343D-33+

Analog Devices Inc./Maxim IntegratedIn Stock: 2296DS1343D-33+ Datasheet

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S-35190A-J8T1U

ABLIC Inc.In Stock: 12112S-35190A-J8T1U Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RX-4575LC:B are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Clock/Calendar functionality with real-time tracking capability
• Serial communication interface (3-wire serial or SPI)
• Operating temperature range: -40°C to 85°C minimum
• Surface mount packaging
• RoHS3 compliance and REACH compliance status
• Alarm feature availability
• Supply voltage overlap with original specification

Substitute Classification:

The three identified substitute parts maintain core RTC functionality and environmental compliance. DS1302SN+ and S-35190A-J8T1U preserve the 3-wire serial interface architecture of the original component. DS1343D-33+ operates via SPI interface, representing an alternative serial protocol suitable for systems capable of SPI integration. All substitutes maintain the -40°C to 85°C operating temperature range and surface mount form factor.

Parameter Comparison

Engineering Selection Recommendations

DS1302SN+ (Analog Devices Inc./Maxim Integrated)

This substitute maintains 3-wire serial interface compatibility with the RX-4575LC:B. The DS1302SN+ operates across 2V to 5.5V, providing overlap with the original specification above 2V. Product status is active with ROHS3 compliance and REACH unaffected classification. The component includes additional features (NVSRAM, trickle-charger) beyond the original specification. Current consumption during timekeeping (0.3µA to 1µA) is comparable to the RX-4575LC:B.

DS1343D-33+ (Analog Devices Inc./Maxim Integrated)

This substitute operates via SPI interface rather than 3-wire serial, requiring interface protocol modification in host circuitry. The DS1343D-33+ is suitable for systems capable of SPI integration. Operating voltage range is 3V to 5.5V, narrower than the original. Product status is active with ROHS3 compliance and REACH unaffected classification. Current consumption during timekeeping is significantly higher (120µA to 160µA), making this option suitable only for applications where power consumption is not a primary constraint.

S-35190A-J8T1U (ABLIC Inc.)

This substitute maintains 3-wire serial interface compatibility with the RX-4575LC:B. The S-35190A-J8T1U operates across 1.3V to 5.5V, providing the widest voltage range coverage including operation below the original 1.6V minimum. Product status is active with ROHS3 compliance and REACH unaffected classification. Current consumption during timekeeping (8µA to 14µA) is higher than the RX-4575LC:B but remains within acceptable low-power parameters for most applications.

Frequently Asked Questions (FAQ)

Q: Can DS1302SN+ directly replace RX-4575LC:B without circuit modification?

A: DS1302SN+ maintains 3-wire serial interface compatibility and operates within overlapping voltage ranges (2V to 5.5V). Pin-to-pin compatibility and signal timing must be verified against specific application schematics. The 8-SOIC package differs from the original 12-TFSOJ package, requiring PCB layout adjustment.

Q: What is the primary difference between DS1302SN+ and DS1343D-33+?

A: DS1302SN+ uses 3-wire serial interface identical to RX-4575LC:B. DS1343D-33+ uses SPI interface, requiring host microcontroller firmware modification to support the different communication protocol. DS1343D-33+ also exhibits significantly higher timekeeping current consumption (120µA to 160µA versus 0.3µA to 1µA).

Q: Is S-35190A-J8T1U suitable for low-voltage applications below 1.6V?

A: S-35190A-J8T1U operates down to 1.3V supply voltage, extending operation below the RX-4575LC:B minimum of 1.6V. This characteristic makes it suitable for applications requiring sub-1.6V operation. Verify that host circuitry supports the lower voltage threshold.

Q: Do all substitute parts maintain the same package footprint?

A: No. RX-4575LC:B uses 12-TFSOJ (0.094", 2.40mm width). DS1302SN+ uses 8-SOIC (0.209", 5.30mm width). DS1343D-33+ uses 14-WFDFN (3x3). S-35190A-J8T1U uses 8-SOIC (0.154", 3.90mm width). PCB layout modification is required for any substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts (DS1302SN+, DS1343D-33+, S-35190A-J8T1U) maintain ROHS3 compliance status, matching the original RX-4575LC:B environmental certification.

Q: Which substitute offers the lowest power consumption?

A: DS1302SN+ provides the lowest timekeeping current consumption at 0.3µA to 1µA at 2V to 5V, comparable to the RX-4575LC:B specification of 0.7µA to 0.9µA at 3V to 5V.