DS17885-5 Equivalent & Substitute Parts

Part Overview

The DS17885-5 is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This 24-DIP through-hole component provides 8KB of parallel interface memory with alarm, daylight savings, leap year, and square wave output capabilities. The device operates at 4.5V to 5.5V with battery backup support from 2.5V to 3.7V.

The DS17885-5 is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support legacy system maintenance and repairs.

Substiute Parts

DS17885-5

Analog Devices Inc./Maxim IntegratedIn Stock: 1224DS17885-5 Datasheet

Current PartRFQ

DP8573AV/NOPB

Texas InstrumentsIn Stock: 4247DP8573AV/NOPB Datasheet

MFR RecommendedRFQ

M48T08-100PC1

STMicroelectronicsIn Stock: 1683M48T08-100PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS17885-5 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Clock/Calendar functionality with parallel interface
• Time format support: HH:MM:SS with 12/24 hour capability
• Date format support: YY-MM-DD-dd
• Supply voltage range: 4.5V ~ 5.5V minimum overlap
• Operating temperature range: 0°C ~ 70°C minimum coverage
• RoHS3 compliance

Secondary Considerations:

• Package type (through-hole or surface mount)
• Memory capacity (8KB or equivalent)
• Feature set (alarm, leap year support)
• Current consumption specifications

The two identified substitute parts meet the core functional and electrical requirements for Clock/Calendar operation with parallel interface architecture.

Parameter Comparison

Engineering Selection Recommendations

DP8573AV/NOPB (Texas Instruments)

This substitute is an active product with ROHS3 compliance. It provides Clock/Calendar functionality with parallel interface and supports the required time and date formats. The extended operating temperature range (-40°C to 85°C) exceeds the original specification. Primary consideration: this device uses surface mount 28-LCC packaging, requiring PCB layout modification from the original 24-DIP through-hole design. Current consumption is significantly lower at 1µA timekeeping current compared to 3mA for the DS17885-5.

M48T08-100PC1 (STMicroelectronics)

This substitute is an active product with ROHS3 compliance and maintains through-hole mounting compatibility. The 28-DIP Module package preserves the original form factor approach, though with increased pin count. Operating temperature range matches the original specification (0°C to 70°C). Supply voltage range is slightly narrower (4.75V minimum vs. 4.5V minimum). This device includes watchdog timer functionality and is part of the Timekeeper® series. Current consumption matches the original specification at 3mA.

Both substitutes satisfy the core Clock/Calendar parallel interface requirements and regulatory compliance standards. Selection depends on PCB layout constraints and specific feature requirements.

Frequently Asked Questions (FAQ)

Q: Can the DP8573AV/NOPB directly replace the DS17885-5 on an existing PCB?

A: No. The DP8573AV/NOPB uses 28-LCC surface mount packaging versus the DS17885-5's 24-DIP through-hole package. PCB redesign is required. However, the electrical functionality and parallel interface are compatible.

Q: Is the M48T08-100PC1 a pin-for-pin replacement?

A: No. The M48T08-100PC1 is a 28-DIP module versus the DS17885-5's 24-DIP package. Pin count and pinout differ. PCB layout modification is necessary, though both use through-hole mounting technology.

Q: What are the key differences in current consumption?

A: The DS17885-5 draws 3mA during timekeeping at 4.5V to 5.5V. The DP8573AV/NOPB draws only 1µA at 5V, providing significantly lower power consumption. The M48T08-100PC1 matches the original at 3mA.

Q: Do all three devices support 12/24 hour time format?

A: Yes. The DS17885-5 and DP8573AV/NOPB both support 12/24 hour formats. The M48T08-100PC1 supports 24-hour format only.

Q: Are there battery backup voltage differences?

A: Yes. The DS17885-5 requires 2.5V to 3.7V battery backup. The DP8573AV/NOPB supports 2.2V to 5.1V, providing broader battery compatibility. The M48T08-100PC1 does not specify battery backup voltage.

Q: Which substitute is recommended for new designs?

A: Both DP8573AV/NOPB and M48T08-100PC1 are active products. Selection depends on form factor requirements: choose DP8573AV/NOPB for surface mount designs or M48T08-100PC1 for through-hole designs. Verify feature compatibility with your specific application requirements.