DS1554-70 Equivalent & Substitute Parts

Part Overview

The DS1554-70 is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, 32KB parallel memory, and comprehensive timekeeping features including alarm, leap year compensation, non-volatile SRAM (NVSRAM), watchdog timer, and Y2K compliance. Manufactured by Analog Devices Inc./Maxim Integrated, this component operates in the 0°C to 70°C temperature range with 4.5V to 5.5V supply voltage.

The DS1554-70 carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support legacy system maintenance or redesign initiatives.

Substiute Parts

DS1554-70

Analog Devices Inc./Maxim IntegratedIn Stock: 20145DS1554-70 Datasheet

Current PartRFQ

DS1554-70+

Analog Devices Inc./Maxim IntegratedIn Stock: 1484DS1554-70+ Datasheet

DirectRFQ

BQ4802LYPWR

Texas InstrumentsIn Stock: 28912BQ4802LYPWR Datasheet

MFR RecommendedRFQ

M48T08Y-10MH1F

STMicroelectronicsIn Stock: 1165M48T08Y-10MH1F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS1554-70 is determined by the following critical parameters:

• Interface Type: Parallel interface requirement
• Time Format & Date Format: HH:MM:SS (24 hr) and YY-MM-DD-dd compatibility
• Operating Temperature Range: 0°C ~ 70°C
• Core Functionality: Clock/Calendar with alarm and watchdog timer capabilities
• Supply Voltage Compatibility: Operating voltage range
• Package Compatibility: Physical form factor and mounting considerations

Substitute parts are grouped into two categories:

Direct Equivalent (Same Manufacturer): DS1554-70+ maintains identical electrical specifications, memory size, and feature set as the original DS1554-70, with the primary distinction being active product status and improved RoHS compliance.

Cross-Manufacturer Alternatives: BQ4802LYPWR (Texas Instruments) and M48T08Y-10MH1F (STMicroelectronics) provide parallel interface Clock/Calendar functionality with compatible time/date formats and operating temperature ranges. These alternatives differ in package type, mounting method, and supply voltage specifications, requiring design-level evaluation for integration feasibility.

Parameter Comparison

Engineering Selection Recommendations

DS1554-70+ (Direct Equivalent)

The DS1554-70+ is the primary substitute for the obsolete DS1554-70. This part maintains identical electrical specifications, memory capacity, feature set, and package form factor. The DS1554-70+ carries Active product status and ROHS3 compliance, providing improved regulatory alignment and supply chain availability compared to the original obsolete part. Selection of DS1554-70+ requires no design modifications and presents the lowest integration risk.

BQ4802LYPWR (Texas Instruments)

The BQ4802LYPWR provides Clock/Calendar functionality with parallel interface and compatible time/date formats. This part operates at a lower supply voltage range (2.7V ~ 3.6V) and exhibits reduced timekeeping current consumption (1.5mA typical). The BQ4802LYPWR is packaged in 28-TSSOP surface mount form factor, requiring PCB redesign and layout modifications. This alternative is suitable for applications where lower power consumption and surface mount integration are design priorities, and where the reduced feature set (absence of NVSRAM and Y2K-specific functionality) is acceptable.

M48T08Y-10MH1F (STMicroelectronics)

The M48T08Y-10MH1F operates within the same 4.5V ~ 5.5V supply voltage range as the DS1554-70 and maintains 24-hour time format compatibility. This part is packaged in 28-SOP surface mount form factor with SNAPHAT sockets. The M48T08Y-10MH1F carries Active product status and ROHS3 compliance. PCB redesign is required for surface mount integration. This alternative is applicable where supply voltage compatibility and 24-hour time format are critical, and where surface mount packaging is acceptable.

Frequently Asked Questions (FAQ)

Q: Can DS1554-70+ be used as a direct replacement for DS1554-70?

A: Yes. The DS1554-70+ maintains identical electrical specifications, memory size, feature set, time/date formats, operating temperature range, and package form factor. No design modifications are required. The primary differences are active product status and improved RoHS compliance.

Q: What are the key differences between DS1554-70 and BQ4802LYPWR?

A: The BQ4802LYPWR differs in supply voltage range (2.7V ~ 3.6V versus 4.5V ~ 5.5V), package type (28-TSSOP surface mount versus 32-DIP through hole), and feature set (absence of NVSRAM and Y2K-specific functionality). The BQ4802LYPWR offers lower timekeeping current consumption. Design-level integration changes are required.

Q: What are the key differences between DS1554-70 and M48T08Y-10MH1F?

A: The M48T08Y-10MH1F differs in package type (28-SOP surface mount with SNAPHAT sockets versus 32-DIP through hole) and feature set (absence of NVSRAM and Y2K-specific functionality). Supply voltage range (4.5V ~ 5.5V) and time format (24 hr) are compatible. PCB redesign is required for surface mount integration.

Q: Are all substitute parts compatible with the same PCB layout?

A: No. The DS1554-70+ maintains identical through-hole DIP packaging and can use the same PCB footprint. The BQ4802LYPWR and M48T08Y-10MH1F require surface mount packaging and necessitate PCB redesign and layout modifications.

Q: Which substitute part offers the lowest power consumption?

A: The BQ4802LYPWR exhibits the lowest timekeeping current consumption at 1.5mA typical at 2.7V ~ 3.6V supply voltage, compared to 6mA for DS1554-70 and 3mA for M48T08Y-10MH1F at their respective supply voltages.

Q: Do all substitute parts support 24-hour time format?

A: DS1554-70+, BQ4802LYPWR (12/24 hr selectable), and M48T08Y-10MH1F all support 24-hour time format operation. All maintain YY-MM-DD-dd date format compatibility.

Q: What compliance certifications apply to each substitute part?

A: DS1554-70 is RoHS non-compliant. DS1554-70+, BQ4802LYPWR, and M48T08Y-10MH1F are all ROHS3 compliant and REACH unaffected. All parts carry EAR99 ECCN classification.