DS1554P-70IND Equivalent & Substitute Parts

Part Overview

The DS1554P-70IND is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, 32KB parallel interface memory, and comprehensive timekeeping features including alarm, leap year compensation, NVSRAM, watchdog timer, and Y2K compliance. Manufactured by Analog Devices Inc./Maxim Integrated, this component operates across -40°C to 85°C with dual power supply support (4.5V–5.5V main, 3V battery backup).

The DS1554P-70IND is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance and redesigns.

Substiute Parts

DS1554P-70IND

Analog Devices Inc./Maxim IntegratedIn Stock: 832DS1554P-70IND Datasheet

Current PartRFQ

DS1554P-70IND+

Analog Devices Inc./Maxim IntegratedIn Stock: 930DS1554P-70IND+ Datasheet

DirectRFQ

M48T35-70PC1

STMicroelectronicsIn Stock: 7799M48T35-70PC1 Datasheet

MFR RecommendedRFQ

M48T35Y-70MH1F

STMicroelectronicsIn Stock: 1491M48T35Y-70MH1F Datasheet

MFR RecommendedRFQ

M48T35Y-70PC1

STMicroelectronicsIn Stock: 3110M48T35Y-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS1554P-70IND is determined by the following critical parameters:

Primary Substitution Criteria:

• Clock/Calendar functionality with parallel interface
• Time format: HH:MM:SS (24 hr)
• Date format: YY-MM-DD-dd
• Voltage supply range compatibility: 4.5V ~ 5.5V or 4.75V ~ 5.5V
• Operating temperature range: minimum -40°C or 0°C, maximum 85°C or 70°C
• Mounting type: Surface Mount or Through Hole (design-dependent)
• Package compatibility: 34-PowerCap™ Module, 28-DIP Module, or 28-SOP Module

Substitute Parts Identified:

1. DS1554P-70IND+ (Direct Equivalent) – Identical specifications with Active product status and improved RoHS3 compliance
2. M48T35-70PC1 (Functional Equivalent) – STMicroelectronics Timekeeper® series, 28-DIP Through Hole package, reduced operating temperature range (0°C ~ 70°C)
3. M48T35Y-70MH1F (Functional Equivalent) – STMicroelectronics Timekeeper® series, 28-SOP Surface Mount package with SNAPHAT Sockets, reduced operating temperature range (0°C ~ 70°C)
4. M48T35Y-70PC1 (Functional Equivalent) – STMicroelectronics Timekeeper® series, 28-DIP Through Hole package, reduced operating temperature range (0°C ~ 70°C)

Parameter Comparison

Engineering Selection Recommendations

DS1554P-70IND+ (Direct Equivalent)

This part maintains identical electrical and functional specifications to the original DS1554P-70IND while offering Active product status, ROHS3 compliance, and REACH unaffected classification. Selection of DS1554P-70IND+ is appropriate for applications requiring direct form-fit-function replacement with improved regulatory compliance and supply chain continuity.

M48T35-70PC1 and M48T35Y-70PC1 (Through Hole Alternatives)

Both STMicroelectronics parts provide Clock/Calendar functionality with parallel interface and identical time/date formats. These parts operate within reduced temperature range (0°C ~ 70°C) compared to the original specification (-40°C ~ 85°C). Through Hole mounting requires PCB redesign. Selection is appropriate for applications operating within 0°C to 70°C and where Through Hole mounting is acceptable. Both parts offer ROHS3 compliance and REACH unaffected status.

M48T35Y-70MH1F (Surface Mount Alternative)

This STMicroelectronics part maintains Surface Mount compatibility with 28-SOP package and SNAPHAT Sockets. Operating temperature range is reduced to 0°C ~ 70°C. Selection is appropriate for applications requiring Surface Mount package compatibility within the reduced temperature range, with ROHS3 compliance and REACH unaffected status.

Regulatory Compliance Consideration

All substitute parts offer ROHS3 compliance and REACH unaffected status, providing regulatory advantage over the obsolete DS1554P-70IND (RoHS non-compliant, REACH Affected).

Frequently Asked Questions (FAQ)

Q: Can DS1554P-70IND+ be used as a direct replacement for DS1554P-70IND?

A: Yes. DS1554P-70IND+ maintains identical electrical specifications, package type (34-PowerCap™ Module), mounting type (Surface Mount), and functional features. The primary difference is Active product status and improved regulatory compliance (ROHS3, REACH unaffected).

Q: What are the key differences between the Maxim and STMicroelectronics substitutes?

A: The primary differences are: (1) Operating temperature range – Maxim parts support -40°C ~ 85°C while STMicroelectronics Timekeeper® parts support 0°C ~ 70°C; (2) Package type – Maxim uses 34-PowerCap™ Module while STMicroelectronics offers 28-DIP or 28-SOP packages; (3) Feature set – Maxim includes Alarm, NVSRAM, and Watchdog Timer while STMicroelectronics parts list only Leap Year; (4) Current consumption – Maxim draws 6mA @ 5V while STMicroelectronics draws 2mA @ 4.75V ~ 5.5V.

Q: Can M48T35Y-70MH1F replace DS1554P-70IND in a Surface Mount application?

A: M48T35Y-70MH1F provides Surface Mount compatibility with 28-SOP package and maintains parallel interface with identical time/date formats. However, the operating temperature range is reduced to 0°C ~ 70°C. Substitution is valid only if the application operates within this temperature range.

Q: What is the impact of switching from 34-PowerCap™ Module to 28-DIP or 28-SOP packages?

A: Package change requires PCB redesign. 28-DIP Module (0.600", 15.24mm) is Through Hole mount, requiring different PCB footprint and assembly process. 28-SOP (0.350", 8.89mm Width) is Surface Mount but with different pin configuration and spacing than 34-PowerCap™ Module. Electrical functionality remains equivalent.

Q: Are there temperature range limitations when using STMicroelectronics substitutes?

A: Yes. M48T35-70PC1, M48T35Y-70MH1F, and M48T35Y-70PC1 operate within 0°C ~ 70°C, compared to DS1554P-70IND specification of -40°C ~ 85°C. Applications requiring operation below 0°C or above 70°C must use DS1554P-70IND+ or equivalent Maxim parts.

Q: What regulatory advantages do substitute parts offer?

A: All substitute parts are ROHS3 compliant and REACH unaffected, compared to the original DS1554P-70IND which is RoHS non-compliant and REACH affected. This provides regulatory compliance advantage for new designs and systems subject to RoHS and REACH requirements.

Q: Can M48T35-70PC1 and M48T35Y-70PC1 be used interchangeably?

A: Both parts are STMicroelectronics Timekeeper® series with identical electrical specifications, 28-DIP Through Hole package, and operating parameters. They are functionally interchangeable. Packaging differs (Tube vs. Tube), but this does not affect electrical compatibility.