DS17285-3 Equivalent & Substitute Parts

Part Overview

The DS17285-3 is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Analog Devices Inc./Maxim Integrated. This 24-DIP through-hole component provides 2KB of parallel interface memory with integrated alarm, daylight savings, leap year, and NVSRAM capabilities. The part is classified as obsolete, making equivalent substitute components necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across time format, date format, interface type, and core RTC features while accommodating different package technologies and voltage specifications.

Substiute Parts

DS17285-3

Analog Devices Inc./Maxim IntegratedIn Stock: 4765DS17285-3 Datasheet

Current PartRFQ

BQ4802LYDWR

Texas InstrumentsIn Stock: 3828BQ4802LYDWR Datasheet

MFR RecommendedRFQ

DP8573AVX/NOPB

National SemiconductorIn Stock: 1484DP8573AVX/NOPB Datasheet

MFR RecommendedRFQ

M48T201Y-70MH1F

STMicroelectronicsIn Stock: 2083M48T201Y-70MH1F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the DS17285-3 is based on the following critical parameters:

Core Functional Requirements:

• Parallel interface architecture
• Clock/Calendar functionality with HH:MM:SS time format and YY-MM-DD-dd date format
• 12/24 hour time format support
• Alarm and leap year capabilities

Electrical Compatibility Criteria:

• Supply voltage range overlap or compatibility with system design
• Battery backup voltage support
• Timekeeping current specifications
• Operating temperature range (0°C ~ 70°C minimum)

Physical & Manufacturing Considerations:

• Package type (through-hole vs. surface mount)
• Pin count and footprint differences
• Mounting technology compatibility

The three substitute parts listed below meet the functional and electrical requirements but differ in package technology, voltage specifications, and additional features. Selection depends on whether the design can accommodate surface-mount technology and voltage range adjustments.

Parameter Comparison

Engineering Selection Recommendations

BQ4802LYDWR (Texas Instruments)

This substitute is recommended for designs operating in the 2.7V ~ 3.6V supply range. The part maintains functional equivalence with the DS17285-3 across time format, date format, and parallel interface architecture. The transition from through-hole to 28-SOIC surface-mount packaging requires PCB redesign. The BQ4802LYDWR is ROHS3 compliant and carries active product status, ensuring long-term availability and manufacturing support. Current consumption is lower (1.5mA typical) compared to the DS17285-3 (2mA maximum), providing improved power efficiency in battery-backed applications.

DP8573AVX/NOPB (National Semiconductor)

This substitute operates in the 4.5V ~ 5.5V supply range and is suitable for systems designed around standard 5V logic levels. The 28-LCC (J-Lead) package differs from both the original through-hole and the BQ4802LYDWR surface-mount options, requiring specific PCB footprint accommodation. The DP8573AVX/NOPB supports an extended operating temperature range (-40°C ~ 85°C) beyond the DS17285-3 specification (0°C ~ 70°C), making it applicable to industrial environments. Product status is active, ensuring continued availability.

M48T201Y-70MH1F (STMicroelectronics)

This substitute is positioned for 4.5V ~ 5.5V supply systems and includes additional features such as supervisor and watchdog timer functionality. The 44-BSOP package represents a significant footprint change and requires SNAPHAT mechanical accommodation. The part is ROHS3 compliant with active product status. The M48T201Y-70MH1F operates within the 0°C ~ 70°C temperature range matching the DS17285-3 specification. This option is suitable when additional supervisory features and higher pin count integration are beneficial to system design.

Frequently Asked Questions (FAQ)

Q: Can the BQ4802LYDWR directly replace the DS17285-3 without PCB modification?

A: No. The BQ4802LYDWR uses a 28-SOIC surface-mount package while the DS17285-3 is a 24-DIP through-hole component. PCB redesign is required to accommodate the different footprint and mounting technology. However, functional compatibility is maintained across parallel interface, time format, date format, and core RTC features.

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

A: The three substitutes differ primarily in supply voltage range and package technology. The BQ4802LYDWR operates at 2.7V ~ 3.6V (similar to the original), while both the DP8573AVX/NOPB and M48T201Y-70MH1F require 4.5V ~ 5.5V supply. Package options range from 28-SOIC to 28-LCC to 44-BSOP, each requiring different PCB footprints.

Q: Is the DS17285-3 still available for new designs?

A: The DS17285-3 is classified as obsolete. While inventory may be available from distributors, new designs should transition to active substitute parts to ensure long-term manufacturing support and component availability.

Q: Do all substitute parts support 12/24 hour time format like the original?

A: The BQ4802LYDWR and DP8573AVX/NOPB both support 12/24 hour time format. The M48T201Y-70MH1F supports 24-hour format only. If 12-hour format is required, the BQ4802LYDWR or DP8573AVX/NOPB are appropriate selections.

Q: What are the RoHS compliance implications?

A: The DS17285-3 is RoHS non-compliant. The BQ4802LYDWR and M48T201Y-70MH1F are ROHS3 compliant, meeting current environmental and regulatory requirements. If RoHS compliance is mandatory for the application, these two options are preferred.

Q: How do battery backup voltage specifications differ?

A: The DS17285-3 supports 2.5V ~ 3.7V battery backup. The BQ4802LYDWR extends this to 2.4V ~ 4V, providing broader compatibility with standard lithium coin cell batteries. The DP8573AVX/NOPB supports 2.2V ~ 5.1V, and the M48T201Y-70MH1F is limited to 3V, requiring specific battery selection.

Q: Which substitute is best for low-power applications?

A: The BQ4802LYDWR offers the lowest timekeeping current at 1.5mA typical (compared to 2mA maximum for the DS17285-3), making it the most power-efficient option for battery-backed timekeeping circuits.