DS1557P-70IND+ Equivalent & Substitute Parts

Part Overview

The DS1557P-70IND+ is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This device features 512KB parallel memory, alarm capability, leap year support, NVSRAM, watchdog timer, and Y2K compliance. The part operates across -40°C to 85°C and is housed in a 34-PowerCap™ Module package for surface mount applications. As an active product with ROHS3 compliance, equivalent and substitute parts are identified based on matching functional parameters: parallel interface, clock/calendar type, operating voltage range, temperature rating, and core timing features.

Substiute Parts

DS1557P-70IND+

Analog Devices Inc./Maxim IntegratedIn Stock: 980DS1557P-70IND+ Datasheet

Current PartRFQ

DS1557P-70IND+

Analog Devices Inc./Maxim IntegratedIn Stock: 980DS1557P-70IND+ Datasheet

DirectRFQ

BQ4802LYPW

Texas InstrumentsIn Stock: 9564BQ4802LYPW Datasheet

MFR RecommendedRFQ

DP8573AV/NOPB

Texas InstrumentsIn Stock: 4247DP8573AV/NOPB Datasheet

MFR RecommendedRFQ

M48T58Y-70PC1

STMicroelectronicsIn Stock: 1732M48T58Y-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS1557P-70IND+ is determined by the following critical parameters:

Primary Substitution Criteria:

• Interface type: Parallel
• Device type: Clock/Calendar with real-time capability
• Time and date format support: HH:MM:SS and YY-MM-DD-dd
• Supply voltage compatibility: 4.5V ~ 5.5V primary supply
• Operating temperature range: -40°C to 85°C
• Core features: Alarm and Leap Year support
• RoHS compliance: ROHS3 Compliant

Secondary Compatibility Factors:

• Package form factor (surface mount or through-hole)
• Current consumption during timekeeping operation
• Battery backup voltage support
• Additional features (Watchdog Timer, Y2K, NVSRAM)

Substitute parts are grouped based on functional equivalence within these parameters. Parts with different package types, voltage ranges, or temperature ratings are listed with explicit parameter differences to enable informed selection.

Parameter Comparison

Engineering Selection Recommendations

DS1557P-70IND+ (Primary Part) All substitute candidates are active products with ROHS3 compliance and REACH unaffected status. Selection among substitutes depends on specific application requirements.

BQ4802LYPW (Texas Instruments) This part operates at reduced supply voltage (2.7V ~ 3.6V) and narrower temperature range (0°C ~ 70°C) compared to the main part. It is suitable for low-power applications but not for extended temperature environments. The 28-TSSOP package differs from the 34-PowerCap™ Module, requiring PCB layout modification.

DP8573AV/NOPB (Texas Instruments) This part matches the primary supply voltage range (4.5V ~ 5.5V) and extended temperature range (-40°C ~ 85°C). It offers the lowest timekeeping current (1µA @ 5V) and broader battery voltage support (2.2V ~ 5.1V). The 28-LCC package requires board redesign. Feature set is limited to Alarm and Leap Year.

M48T58Y-70PC1 (STMicroelectronics) This part matches the primary supply voltage range (4.5V ~ 5.5V) but operates at reduced temperature range (0°C ~ 70°C). It features through-hole mounting (28-DIP Module) instead of surface mount, suitable for legacy or prototype applications. Timekeeping current is 3mA @ 4.5V ~ 5.5V. Feature set includes only Leap Year support.

Frequently Asked Questions (FAQ)

Q: Can BQ4802LYPW replace DS1557P-70IND+ in all applications? A: No. BQ4802LYPW operates at 2.7V ~ 3.6V supply voltage and 0°C ~ 70°C temperature range, which are narrower than DS1557P-70IND+ specifications (4.5V ~ 5.5V, -40°C ~ 85°C). Use BQ4802LYPW only in applications within its specified operating envelope.

Q: What are the package differences among substitute parts? A: DS1557P-70IND+ uses 34-PowerCap™ Module (surface mount). BQ4802LYPW uses 28-TSSOP surface mount. DP8573AV/NOPB uses 28-LCC surface mount. M48T58Y-70PC1 uses 28-DIP through-hole. Package changes require PCB redesign and different assembly processes.

Q: Which substitute has the lowest power consumption? A: DP8573AV/NOPB has the lowest timekeeping current at 1µA @ 5V, compared to 6mA for DS1557P-70IND+, 1.5mA for BQ4802LYPW, and 3mA for M48T58Y-70PC1.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitutes (BQ4802LYPW, DP8573AV/NOPB, M48T58Y-70PC1) are ROHS3 compliant and REACH unaffected, matching the compliance status of DS1557P-70IND+.

Q: Which substitute maintains the full feature set of DS1557P-70IND+? A: BQ4802LYPW includes Alarm, Daylight Savings, Leap Year, Supervisor, and Watchdog Timer features. DP8573AV/NOPB and M48T58Y-70PC1 have reduced feature sets. None include NVSRAM or Y2K features identical to the main part.

Q: Can M48T58Y-70PC1 be used in new surface mount designs? A: No. M48T58Y-70PC1 is a through-hole 28-DIP package, designed for legacy or prototype applications. For new surface mount designs, use BQ4802LYPW or DP8573AV/NOPB.

Q: What is the temperature range limitation for BQ4802LYPW and M48T58Y-70PC1? A: Both parts operate at 0°C ~ 70°C, which excludes extended low-temperature operation below 0°C and high-temperature operation above 70°C. DS1557P-70IND+ and DP8573AV/NOPB support -40°C ~ 85°C.