DS17885-3+ Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The DS17885-3+ is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This device features 8KB of NVSRAM, parallel interface, and comprehensive timekeeping capabilities including alarm, daylight savings, and leap year support. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Substiute Parts

DS17885-3+

Analog Devices Inc./Maxim IntegratedIn Stock: 1027DS17885-3+ Datasheet

Current PartRFQ

DP8573AVX/NOPB

National SemiconductorIn Stock: 1484DP8573AVX/NOPB Datasheet

MFR RecommendedRFQ

M48T02-150PC1

STMicroelectronicsIn Stock: 1525M48T02-150PC1 Datasheet

MFR RecommendedRFQ

M48T08-150PC1

STMicroelectronicsIn Stock: 1658M48T08-150PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DS17885-3+ is determined by the following critical parameters:

Primary Substitution Criteria:

• Interface type: Parallel
• Package compatibility: 24-DIP through-hole mounting
• Time format support: HH:MM:SS with 12/24 hour capability
• Date format support: YY-MM-DD-dd
• Functional features: Alarm, Leap Year support
• Supply voltage compatibility: Low-voltage operation (2.7V ~ 5.5V range)
• RoHS3 compliance

Substitute Parts Identified:

1. M48T02-150PC1 (STMicroelectronics) – Direct package match (24-DIP), parallel interface, through-hole mounting, Timekeeper® series, active product status
2. M48T08-150PC1 (STMicroelectronics) – Enhanced variant with 28-DIP package, parallel interface, through-hole mounting, includes watchdog timer, active product status
3. DP8573AVX/NOPB (National Semiconductor) – Parallel interface, clock/calendar functionality, surface mount alternative (28-LCC), active product status

Parameter Comparison

Engineering Selection Recommendations

M48T02-150PC1 Selection:

• Recommended for direct replacement in through-hole 24-DIP applications
• Maintains identical package footprint and pin compatibility
• Active product status ensures long-term availability
• ROHS3 compliant
• Operating temperature range matches original specification
• Supply voltage operates at standard 5V logic levels (4.75V ~ 5.5V)

M48T08-150PC1 Selection:

• Suitable for applications requiring additional functionality (watchdog timer)
• 28-DIP package requires PCB layout modification
• Active product status with extended feature set
• ROHS3 compliant
• Identical operating temperature and supply voltage characteristics to M48T02-150PC1

DP8573AVX/NOPB Selection:

• Applicable for new designs or systems transitioning to surface mount technology
• Extended operating temperature range (-40°C ~ 85°C) supports broader environmental conditions
• Lowest timekeeping current consumption (1µA @ 5V)
• 28-LCC package requires different PCB layout and assembly process
• Requires board redesign for implementation

Frequently Asked Questions (FAQ)

Q: Can M48T02-150PC1 directly replace DS17885-3+ without PCB modification? A: Yes. M48T02-150PC1 maintains the 24-DIP package format with identical 0.600" (15.24mm) spacing, enabling direct pin-for-pin substitution on existing through-hole PCBs.

Q: What is the primary difference between M48T02-150PC1 and M48T08-150PC1? A: M48T08-150PC1 provides additional watchdog timer functionality and uses a 28-DIP package instead of 24-DIP. Both share identical supply voltage, operating temperature, and timekeeping current specifications.

Q: Why does DP8573AVX/NOPB have lower timekeeping current consumption? A: DP8573AVX/NOPB achieves 1µA @ 5V timekeeping current through different circuit design. This part operates at standard 5V logic levels rather than the low-voltage 2.7V ~ 3.7V range of the original DS17885-3+.

Q: Is DP8573AVX/NOPB suitable for existing DS17885-3+ applications? A: DP8573AVX/NOPB requires PCB redesign due to 28-LCC surface mount package format. It is applicable for new designs or systems undergoing board-level redesign.

Q: Are all substitute parts RoHS3 compliant? A: M48T02-150PC1 and M48T08-150PC1 are confirmed ROHS3 compliant. DP8573AVX/NOPB RoHS status is not specified in available documentation.

Q: What is the impact of supply voltage differences between DS17885-3+ and substitute parts? A: DS17885-3+ operates at 2.7V ~ 3.7V, while M48T02-150PC1 and M48T08-150PC1 require 4.75V ~ 5.5V. System power supply design must accommodate this voltage requirement change.

Q: Can substitute parts support 12-hour time format operation? A: M48T02-150PC1 and M48T08-150PC1 support 24-hour format only. DP8573AVX/NOPB supports both 12/24-hour formats, matching the original DS17885-3+ capability.