DS1746P-70IND+ Equivalent & Substitute Parts

Part Overview

The DS1746P-70IND+ is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This Surface Mount device features 128KB NVSRAM, Leap Year support, and Y2K compliance. The part is classified as Obsolete, making equivalent substitutes necessary for ongoing system support and new designs requiring RTC functionality with parallel interface architecture.

Key Parameters

Parameter	DS1746P-70IND+
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Clock/Timing
Type	Clock/Calendar
Memory Size	128KB
Interface	Parallel
Time Format	HH:MM:SS (24 hr)
Date Format	YY-MM-DD-dd
Voltage - Supply	4.5V ~ 5.5V
Voltage - Supply, Battery	3V
Current - Timekeeping (Max)	4mA @ 5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	34-PowerCap™ Module
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the DS1746P-70IND+ is determined by the following critical parameters:

Core Functional Requirements:

Parallel interface architecture for Clock/Calendar operation
Time format support: HH:MM:SS (24 hr)
Date format support: YY-MM-DD-dd
Leap Year functionality
Supply voltage compatibility within 4.5V ~ 5.5V range
Operating temperature range coverage

Mechanical & Compliance Considerations:

RoHS3 compliance status
REACH unaffected classification
EAR99 export control rating

The three substitute parts listed (M48T02-150PC1, M48T18-150PC1, M48T58Y-70PC1) maintain functional equivalence through parallel interface design and compatible time/date format support. However, substitution requires evaluation of mounting type differences (Surface Mount to Through Hole transition) and package configuration changes.

Parameter Comparison

Parameter	DS1746P-70IND+	M48T02-150PC1	M48T18-150PC1	M48T58Y-70PC1
Manufacturer	Analog Devices Inc./Maxim Integrated	STMicroelectronics	STMicroelectronics	STMicroelectronics
Category	Clock/Timing	Clock/Timing	Clock/Timing	Clock/Timing
Type	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar
Interface	Parallel	Parallel	Parallel	Parallel
Time Format	HH:MM:SS (24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
Voltage - Supply	4.5V ~ 5.5V	4.75V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Timekeeping (Max)	4mA @ 5V	3mA @ 4.7V ~ 5.5V	3mA @ 4.5V ~ 5.5V	3mA @ 4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Through Hole	Through Hole	Through Hole
Package / Case	34-PowerCap™ Module	24-DIP Module (0.600", 15.24mm)	28-DIP Module (0.600", 15.24mm)	28-DIP Module (0.600", 15.24mm)
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Product Status Consideration: The DS1746P-70IND+ is classified as Obsolete. All three substitute parts (M48T02-150PC1, M48T18-150PC1, M48T58Y-70PC1) maintain Active product status with STMicroelectronics, ensuring long-term availability and manufacturing support.

Compliance & Certification: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory classification. All parts carry EAR99 export control rating.

Operating Temperature Range: The original DS1746P-70IND+ operates across -40°C ~ 85°C. All substitute parts operate within 0°C ~ 70°C. Applications requiring extended low-temperature operation below 0°C or high-temperature operation above 70°C require design-level evaluation.

Mounting Architecture: Substitution from Surface Mount (34-PowerCap™ Module) to Through Hole DIP packages requires PCB redesign. This represents a significant mechanical change necessitating layout and assembly process modifications.

Supply Voltage Range: M48T02-150PC1 specifies 4.75V ~ 5.5V minimum supply voltage, compared to the original 4.5V ~ 5.5V. Systems operating below 4.75V require M48T18-150PC1 or M48T58Y-70PC1 for voltage compatibility.

Frequently Asked Questions (FAQ)

Q: Can M48T02-150PC1, M48T18-150PC1, and M48T58Y-70PC1 be used interchangeably as substitutes for DS1746P-70IND+?

A: All three parts maintain parallel interface architecture and compatible time/date format support (HH:MM:SS 24-hour, YY-MM-DD-dd). However, they differ in package configuration (24-DIP vs. 28-DIP) and supply voltage specifications. Selection depends on specific circuit requirements and PCB layout constraints.

Q: What is the primary difference between the three substitute parts?

A: M48T02-150PC1 is a 24-DIP package with 4.75V ~ 5.5V supply range. M48T18-150PC1 and M48T58Y-70PC1 are both 28-DIP packages with 4.5V ~ 5.5V supply range. M48T18-150PC1 includes Watchdog Timer functionality, while M48T58Y-70PC1 does not.

Q: Does the mounting type change affect electrical compatibility?

A: Mounting type change (Surface Mount to Through Hole) is a mechanical consideration only. Electrical compatibility is maintained through parallel interface equivalence and matching time/date format support. PCB redesign is required to accommodate the different package footprint.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts (M48T02-150PC1, M48T18-150PC1, M48T58Y-70PC1) are ROHS3 compliant, matching the original DS1746P-70IND+ compliance status.

Q: What is the impact of the reduced operating temperature range in substitute parts?

A: Substitute parts operate within 0°C ~ 70°C, compared to the original -40°C ~ 85°C range. Applications requiring operation below 0°C or above 70°C cannot use these substitutes without design modification or alternative component selection.

Q: Which substitute part should be selected for systems with supply voltages between 4.5V and 4.75V?

A: M48T02-150PC1 specifies minimum 4.75V supply voltage and is not suitable for systems operating at 4.5V ~ 4.74V. M48T18-150PC1 or M48T58Y-70PC1 support the full 4.5V ~ 5.5V range and are appropriate for this voltage window.

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