DS1744P-70IND Equivalent & Substitute Parts

Part Overview

The DS1744P-70IND is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, 32KB NVSRAM, and parallel interface from Analog Devices Inc./Maxim Integrated. This component operates in the 4.5V to 5.5V supply range with battery backup at 3V and supports 24-hour time format with leap year compensation and Y2K compliance. The DS1744P-70IND is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Substiute Parts

DS1744P-70IND

Analog Devices Inc./Maxim IntegratedIn Stock: 1218DS1744P-70IND Datasheet

Current PartRFQ

DS1744P-70IND+

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

DirectRFQ

M48T12-70PC1

STMicroelectronicsIn Stock: 2150M48T12-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DS1744P-70IND is determined by the following critical parameters:

• Interface Type: Parallel interface requirement
• Time/Date Format: HH:MM:SS (24 hr) and YY-MM-DD-dd format support
• Supply Voltage: 4.5V ~ 5.5V operating range
• Clock/Calendar Functionality: Real-time clock with calendar capability
• Package Compatibility: Physical form factor and mounting type

Two substitute parts are identified based on these criteria:

DS1744P-70IND+ (Direct Equivalent): Identical electrical and functional specifications with updated RoHS3 compliance and active product status. Packaging differs (Tray vs. unspecified original).

M48T12-70PC1 (Functional Substitute): Meets core clock/calendar and parallel interface requirements with compatible supply voltage and time/date formats. Differs in package type (24-DIP Through Hole vs. 34-PowerCap™ Surface Mount), operating temperature range, and mounting methodology.

Parameter Comparison

Engineering Selection Recommendations

DS1744P-70IND+ is the primary substitute for direct replacement applications. This part maintains identical electrical specifications, functional features, and package form factor as the obsolete DS1744P-70IND. The DS1744P-70IND+ achieves ROHS3 compliance and holds active product status, ensuring long-term availability and regulatory alignment. Selection of DS1744P-70IND+ eliminates design modifications and maintains full compatibility with existing PCB layouts and firmware implementations.

M48T12-70PC1 serves as a functional alternative for applications where package and mounting type modifications are acceptable. This STMicroelectronics Timekeeper® series component provides equivalent clock/calendar and parallel interface functionality with compatible supply voltage and time/date format specifications. The M48T12-70PC1 operates within a narrower temperature range (0°C ~ 70°C versus -40°C ~ 85°C) and requires through-hole mounting rather than surface mount. This substitute is suitable for legacy system support or new designs with relaxed temperature requirements and through-hole assembly capability. The M48T12-70PC1 also achieves ROHS3 compliance and maintains active product status.

Frequently Asked Questions (FAQ)

Q: Can DS1744P-70IND+ be used as a direct replacement for DS1744P-70IND?

A: Yes. DS1744P-70IND+ is electrically and functionally identical to DS1744P-70IND, with the same 34-PowerCap™ Module package, parallel interface, 32KB memory, and operating specifications. The primary differences are active product status and ROHS3 compliance. No design modifications are required.

Q: What are the key differences between DS1744P-70IND+ and M48T12-70PC1?

A: Both parts provide parallel interface clock/calendar functionality with compatible supply voltage (4.5V ~ 5.5V) and time/date formats. Key differences include: DS1744P-70IND+ uses 34-PowerCap™ surface mount packaging with -40°C ~ 85°C operating range and 32KB memory; M48T12-70PC1 uses 24-DIP through-hole packaging with 0°C ~ 70°C operating range and unspecified memory size. Package and mounting type selection depends on PCB design and assembly methodology.

Q: Is M48T12-70PC1 suitable for applications requiring -40°C ~ 85°C operation?

A: No. M48T12-70PC1 operates within 0°C ~ 70°C temperature range, which does not meet the extended low-temperature specification of the original DS1744P-70IND (-40°C ~ 85°C). For applications requiring full temperature range operation, DS1744P-70IND+ is the appropriate substitute.

Q: What is the impact of switching from surface mount (DS1744P-70IND+) to through-hole (M48T12-70PC1) packaging?

A: Through-hole mounting requires PCB redesign with different pad layouts and assembly process modifications. Surface mount assembly is not compatible with through-hole components. This substitution is only viable for new designs or systems undergoing PCB revision.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both DS1744P-70IND+ and M48T12-70PC1 achieve ROHS3 compliance, whereas the original DS1744P-70IND is RoHS non-compliant. This compliance improvement supports regulatory requirements for new system designs and procurement.

Q: What is the battery backup voltage specification for M48T12-70PC1?

A: Battery backup voltage is not specified in the M48T12-70PC1 datasheet parameters provided. Verification with STMicroelectronics technical documentation is necessary if battery backup operation is a system requirement.