DS17887-3 Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The DS17887-3 is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, 8KB parallel memory, and non-volatile static RAM (NVSRAM). Manufactured by Analog Devices Inc./Maxim Integrated, this component operates in the 2.7V to 3.7V supply range and provides 12/24-hour time format with full date tracking including leap year compensation.

The DS17887-3 is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing system support. Active substitute parts maintain core RTC functionality while offering improved product status and compliance certifications.

Substiute Parts

DS17887-3

Analog Devices Inc./Maxim IntegratedIn Stock: 3543DS17887-3 Datasheet

Current PartRFQ

DS17887-3+

Analog Devices Inc./Maxim IntegratedIn Stock: 1362DS17887-3+ Datasheet

DirectRFQ

DP8573AV/NOPB

Texas InstrumentsIn Stock: 4247DP8573AV/NOPB Datasheet

MFR RecommendedRFQ

M48T18-100PC1

STMicroelectronicsIn Stock: 1462M48T18-100PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DS17887-3 are identified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Clock/Calendar functionality with parallel interface
• Time format support (12/24-hour HH:MM:SS)
• Date format support (YY-MM-DD-dd)
• Leap year compensation
• Through-hole mounting capability
• Operating temperature range compatibility (minimum 0°C ~ 70°C)

Secondary Considerations:

• Product status (active vs. obsolete)
• RoHS and REACH compliance certifications
• Supply voltage compatibility
• Package form factor (DIP module variants)

The DS17887-3+ represents a direct form-factor and functional equivalent with improved compliance status. The DP8573AV/NOPB and M48T18-100PC1 provide alternative package configurations while maintaining core RTC and parallel interface functionality, though with different electrical specifications and mounting approaches.

Parameter Comparison

Engineering Selection Recommendations

DS17887-3+ (Direct Replacement)

The DS17887-3+ is the primary substitute for the obsolete DS17887-3. This part maintains identical form factor (24-DIP), electrical specifications (2.7V ~ 3.7V supply), and functional feature set including NVSRAM, daylight savings, and square wave output. The DS17887-3+ is active in production status and achieves ROHS3 compliance, addressing the regulatory limitations of the original part. Pin-for-pin compatibility and matching package dimensions enable direct board-level substitution without design modification.

DP8573AV/NOPB (Alternative with Package Change)

The DP8573AV/NOPB from Texas Instruments provides RTC Clock/Calendar functionality with parallel interface and leap year support. This part operates at 4.5V ~ 5.5V supply voltage, requiring circuit redesign for systems originally specified at 2.7V ~ 3.7V. The DP8573AV/NOPB uses surface-mount 28-LCC (J-Lead) packaging, necessitating PCB layout modification. Extended operating temperature range (-40°C ~ 85°C) and ROHS3 compliance are provided. This substitute is suitable only for new designs with compatible voltage specifications and surface-mount assembly capability.

M48T18-100PC1 (Alternative with Package Change)

The M48T18-100PC1 from STMicroelectronics (Timekeeper® series) delivers RTC Clock/Calendar functionality in 28-DIP through-hole packaging. This part requires 4.5V ~ 5.5V supply voltage, incompatible with the original 2.7V ~ 3.7V specification. The 28-DIP package differs from the original 24-DIP, requiring PCB redesign. The M48T18-100PC1 includes watchdog timer functionality and achieves ROHS3 compliance. This substitute is applicable only to new designs with compatible voltage requirements and through-hole assembly processes.

Frequently Asked Questions (FAQ)

Q: Can DS17887-3+ be used as a direct replacement for DS17887-3?

A: Yes. The DS17887-3+ maintains identical pin count (24), package form factor (24-DIP Module 0.600"), electrical specifications (2.7V ~ 3.7V supply), and functional features (Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output). No circuit modification is required for substitution.

Q: What are the key differences between DS17887-3+ and DP8573AV/NOPB?

A: The DS17887-3+ operates at 2.7V ~ 3.7V with 24-DIP through-hole packaging. The DP8573AV/NOPB requires 4.5V ~ 5.5V supply voltage and uses 28-LCC surface-mount packaging. The DP8573AV/NOPB does not include daylight savings or square wave output features. Circuit redesign is necessary for voltage compatibility and PCB layout modification for package change.

Q: Is the M48T18-100PC1 compatible with existing DS17887-3 designs?

A: The M48T18-100PC1 maintains through-hole mounting and parallel interface but requires 4.5V ~ 5.5V supply voltage versus the original 2.7V ~ 3.7V specification. The 28-DIP package differs from the original 24-DIP, requiring PCB redesign. Circuit modification is mandatory for voltage compatibility.

Q: What compliance certifications apply to substitute parts?

A: DS17887-3+ achieves ROHS3 compliance and REACH Unaffected status. DP8573AV/NOPB and M48T18-100PC1 both achieve ROHS3 compliance and REACH Unaffected status. The original DS17887-3 is RoHS non-compliant.

Q: Are there operating temperature range limitations for substitution?

A: The original DS17887-3 and DS17887-3+ operate at 0°C ~ 70°C. The DP8573AV/NOPB extends to -40°C ~ 85°C. The M48T18-100PC1 matches the original range at 0°C ~ 70°C. Verify application temperature requirements before selection.

Q: What is the moisture sensitivity level (MSL) for each part?

A: DS17887-3, DS17887-3+, and M48T18-100PC1 all carry MSL 1 (Unlimited). The DP8573AV/NOPB carries MSL 2A (4 Weeks), requiring controlled storage and handling procedures.