RTC-72423A:2 Equivalent & Substitute Parts

Part Overview

The RTC-72423A:2 is a Real Time Clock (RTC) IC with Clock/Calendar functionality in a 24-SOIC package, manufactured by EPSON. This device provides parallel interface timing and calendar operations with leap year support and dual time format capability (12/24 hour). The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support, maintenance, and new design implementations requiring compatible RTC functionality.

Substiute Parts

RTC-72423A:2

EPSONIn Stock: 796RTC-72423A:2 Datasheet

Current PartRFQ

DS12885Q+T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 2209DS12885Q+T&R Datasheet

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DS12885SN+T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 758DS12885SN+T&R Datasheet

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DS12R885S-5+T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 969DS12R885S-5+T&R Datasheet

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DS1556W-120+

Analog Devices Inc./Maxim IntegratedIn Stock: 876DS1556W-120+ Datasheet

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DS1685Q-5+

Analog Devices Inc./Maxim IntegratedIn Stock: 895DS1685Q-5+ Datasheet

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DS1687-5+

Analog Devices Inc./Maxim IntegratedIn Stock: 1365DS1687-5+ Datasheet

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DS1744P-70IND+

Analog Devices Inc./Maxim IntegratedIn Stock: 2423DS1744P-70IND+ Datasheet

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DS17885SN-3+

Analog Devices Inc./Maxim IntegratedIn Stock: 1010DS17885SN-3+ Datasheet

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M48T18-150PC1

STMicroelectronicsIn Stock: 1310M48T18-150PC1 Datasheet

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M48T37Y-70MH1F

STMicroelectronicsIn Stock: 2256M48T37Y-70MH1F Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RTC-72423A:2 are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Interface type: Parallel
• Time format support: HH:MM:SS (12/24 hr)
• Date format support: YY-MM-DD-dd
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: -40°C ~ 85°C
• Mounting type: Surface Mount
• Package compatibility: 24-SOIC form factor

Substitution Groups:

Group 1: Direct Package Match (24-SOIC Surface Mount) Parts maintaining the same 24-SOIC package footprint with compatible electrical specifications: DS12885SN+T&R, DS12R885S-5+T&R, DS17885SN-3+

Group 2: Alternative Package Formats (Surface Mount) Parts with different surface mount packages but equivalent functional parameters: DS12885Q+T&R (28-PLCC), DS1744P-70IND+ (34-PowerCap Module)

Group 3: Through-Hole Alternatives Parts with through-hole mounting and compatible electrical specifications: DS1556W-120+ (32-DIP Module), DS1687-5+ (24-DIP Module), M48T18-150PC1 (28-DIP Module)

Group 4: Alternative Manufacturers STMicroelectronics Timekeeper® series parts with compatible RTC functionality: M48T18-150PC1, M48T37Y-70MH1F

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Package Footprint): DS12885SN+T&R and DS12R885S-5+T&R are the primary candidates for direct substitution in existing PCB layouts. Both maintain the 24-SOIC surface mount package and support the required 4.5V ~ 5.5V supply voltage with -40°C ~ 85°C operating temperature range. DS12885SN+T&R is ROHS3 compliant and currently in active production status with 657 units in stock. DS12R885S-5+T&R offers enhanced low-power timekeeping at 2mA and includes trickle-charger functionality, with 889 units available.

For Extended Temperature Range Applications: DS12885SN+T&R and DS12R885S-5+T&R both support the full -40°C ~ 85°C operating temperature range matching the original RTC-72423A:2 specification. DS17885SN-3+ also supports this temperature range but operates at reduced supply voltage (2.7V ~ 3.7V), requiring voltage regulation modifications.

For Active Production Availability: All substitute parts listed are in active production status with current inventory. DS1744P-70IND+ offers the highest inventory level (2400 units) with 32KB memory and -40°C ~ 85°C temperature support. M48T37Y-70MH1F provides 2200 units in stock from STMicroelectronics Timekeeper® series.

For RoHS Compliance: All substitute parts are ROHS3 compliant, meeting modern environmental and regulatory requirements. The original RTC-72423A:2 is RoHS non-compliant.

For Packaging Constraints: If PCB redesign is acceptable, DS1744P-70IND+ (34-PowerCap Module) and M48T37Y-70MH1F (44-BSOP) provide surface mount alternatives with enhanced functionality. Through-hole alternatives DS1687-5+ (24-DIP) and M48T18-150PC1 (28-DIP) are available for applications permitting board layout modification.

Frequently Asked Questions (FAQ)

Q: Can DS12885SN+T&R directly replace RTC-72423A:2 without PCB modification? A: DS12885SN+T&R maintains the 24-SOIC surface mount package format. However, the package dimensions differ slightly (0.295" vs 0.311" width). Verify PCB footprint compatibility before implementation. Electrical specifications are fully compatible.

Q: What is the primary difference between DS12885SN+T&R and DS12R885S-5+T&R? A: DS12R885S-5+T&R includes trickle-charger functionality and operates at lower timekeeping current (2mA vs 15mA). Battery supply voltage range is 2V ~ 3.05V compared to 2.5V ~ 4V. Both support identical time/date formats and operating temperature range.

Q: Why does DS17885SN-3+ have a different supply voltage specification? A: DS17885SN-3+ is designed for low-voltage applications with 2.7V ~ 3.7V supply range. While it maintains parallel interface and time/date format compatibility, circuit redesign is required to accommodate the reduced supply voltage. This part is not suitable for direct substitution in 5V systems.

Q: Are through-hole alternatives viable for surface mount applications? A: Through-hole parts (DS1687-5+, M48T18-150PC1, DS1556W-120+) require PCB redesign with different mounting holes and trace routing. These are suitable only for new designs or boards undergoing layout revision. They are not direct replacements for surface mount applications.

Q: What is the significance of the 24-hour vs 12/24-hour time format difference? A: RTC-72423A:2 supports both 12-hour and 24-hour time formats. DS1556W-120+ and DS1744P-70IND+ support 24-hour format only. If firmware or system design requires 12-hour format capability, select parts explicitly supporting 12/24-hour operation (DS12885SN+T&R, DS12R885S-5+T&R, DS1685Q-5+, DS1687-5+, DS17885SN-3+).

Q: What packaging considerations apply to M48T37Y-70MH1F? A: M48T37Y-70MH1F uses 44-BSOP package requiring SNAPHAT mechanical support. This is a specialized package format requiring specific mounting hardware. Verify mechanical compatibility with system enclosure and PCB assembly capabilities before selection.

Q: Are all substitute parts available in current inventory? A: All listed substitute parts are in active production with current stock availability ranging from 657 to 2400 units. Verify specific part availability with supplier before design commitment.

Q: What compliance certifications apply to substitute parts? A: All substitute parts are ROHS3 compliant and REACH unaffected. ECCN classification is EAR99 for all parts. Moisture sensitivity levels vary from MSL 1 (unlimited) to MSL 3 (168 hours), affecting storage and handling requirements.