DS1744-70IND Equivalent & Substitute Parts

Part Overview

The DS1744-70IND is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, 32KB NVSRAM, and parallel interface, manufactured by Analog Devices Inc./Maxim Integrated. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing system support. The DS1744-70IND operates across industrial temperature ranges (-40°C to 85°C) and supports critical timekeeping features including leap year compensation and Y2K compliance.

Substiute Parts

DS1744-70IND

Analog Devices Inc./Maxim IntegratedIn Stock: 1439DS1744-70IND Datasheet

Current PartRFQ

DS1744-70IND+

Analog Devices Inc./Maxim IntegratedIn Stock: 1400DS1744-70IND+ Datasheet

DirectRFQ

BQ4802YPW

Texas InstrumentsIn Stock: 1928BQ4802YPW Datasheet

MFR RecommendedRFQ

DP8573AV/NOPB

Texas InstrumentsIn Stock: 4247DP8573AV/NOPB Datasheet

MFR RecommendedRFQ

M48T35AV-10PC1

STMicroelectronicsIn Stock: 1390M48T35AV-10PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DS1744-70IND is determined by the following critical parameters:

Primary Compatibility Criteria:

• Parallel interface architecture
• Clock/Calendar functionality with date and time tracking
• Supply voltage range compatibility (4.5V ~ 5.5V nominal operation)
• Time and date format support (HH:MM:SS and YY-MM-DD-dd)
• Operating temperature range requirements
• Package form factor and mounting technology

Substitution Categories:

Direct Replacement (Same Package, Active Status): DS1744-70IND+ maintains identical electrical specifications, package geometry (28-DIP Module), and functional parameters while offering active product status and improved RoHS3 compliance.

Functional Equivalent (Different Package, Enhanced Features): BQ4802YPW and DP8573AV/NOPB provide parallel interface RTC/Clock-Calendar functionality with compatible voltage supplies and date/time formats. These parts introduce additional features (alarm, daylight savings, watchdog timer) and surface-mount packaging options, requiring PCB redesign.

Voltage-Constrained Substitute (Through-Hole Package): M48T35AV-10PC1 maintains through-hole mounting and 28-DIP package geometry but operates at reduced supply voltage (3V ~ 3.6V), limiting direct substitution to systems capable of voltage adjustment.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution (No PCB Modification): DS1744-70IND+ is the primary equivalent, offering identical electrical and mechanical specifications with active product status and ROHS3 compliance. This part maintains the same 28-DIP through-hole package and supply voltage range, enabling direct socket replacement without design changes.

For New Designs Requiring RoHS3 Compliance: DP8573AV/NOPB provides the lowest timekeeping current (1µA @ 5V) and maintains the full industrial temperature range (-40°C ~ 85°C). Surface-mount 28-LCC packaging requires PCB redesign. BQ4802YPW offers additional features (alarm, daylight savings, watchdog timer) in 28-TSSOP surface-mount package but is limited to 0°C ~ 70°C operating temperature.

For Voltage-Constrained Applications: M48T35AV-10PC1 maintains through-hole 28-DIP package geometry and active product status but requires system operation at 3V ~ 3.6V supply voltage. This part is suitable only for applications capable of voltage adjustment and operating within 0°C ~ 70°C temperature range.

Compliance Considerations: All substitute parts except DS1744-70IND+ are ROHS3 compliant. The original DS1744-70IND is RoHS non-compliant; migration to compliant alternatives is recommended for new procurement and long-term system support.

Frequently Asked Questions (FAQ)

Q: Can DS1744-70IND+ be used as a direct replacement for DS1744-70IND? A: Yes. DS1744-70IND+ is electrically and mechanically identical, with the same 28-DIP package, supply voltage (4.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and parallel interface. No PCB modifications are required. The primary difference is active product status and ROHS3 compliance.

Q: What are the key differences between through-hole and surface-mount substitutes? A: DS1744-70IND and M48T35AV-10PC1 use through-hole 28-DIP packages compatible with existing PCB designs. BQ4802YPW (28-TSSOP) and DP8573AV/NOPB (28-LCC) require surface-mount assembly and PCB redesign. Surface-mount options typically offer improved power efficiency and additional integrated features.

Q: Is BQ4802YPW suitable for industrial temperature applications? A: No. BQ4802YPW operates within 0°C ~ 70°C, which does not meet the industrial temperature range (-40°C ~ 85°C) of the original DS1744-70IND. DP8573AV/NOPB and DS1744-70IND+ maintain full industrial temperature range compatibility.

Q: What is the impact of M48T35AV-10PC1's reduced supply voltage? A: M48T35AV-10PC1 operates at 3V ~ 3.6V, compared to the DS1744-70IND's 4.5V ~ 5.5V range. This part requires system-level voltage adjustment and is suitable only for applications designed for 3V operation. It is not a direct drop-in replacement for 5V systems.

Q: Which substitute offers the lowest power consumption? A: DP8573AV/NOPB provides the lowest timekeeping current at 1µA @ 5V, compared to 4mA for DS1744-70IND and 1.5mA (typical) for BQ4802YPW. This makes DP8573AV/NOPB optimal for battery-backed or low-power applications, provided surface-mount assembly is feasible.

Q: Are all substitutes RoHS3 compliant? A: Yes, all substitute parts (DS1744-70IND+, BQ4802YPW, DP8573AV/NOPB, M48T35AV-10PC1) are ROHS3 compliant. The original DS1744-70IND is RoHS non-compliant.