DS17485-5 Equivalent & Substitute Parts

Part Overview

The DS17485-5 is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This 24-DIP parallel interface device provides 4KB of NVSRAM with comprehensive timekeeping features including alarm, daylight savings, leap year support, and square wave output. The device operates across a 4.5V to 5.5V supply range with battery backup capability (2.5V to 3.7V).

The DS17485-5 is classified as obsolete. Locating equivalent substitute parts is necessary to support legacy system maintenance, board redesigns, and production continuity where original components are no longer readily available or have reached end-of-life status.

Substiute Parts

DS17485-5

Analog Devices Inc./Maxim IntegratedIn Stock: 2264DS17485-5 Datasheet

Current PartRFQ

M48T08-150PC1

STMicroelectronicsIn Stock: 1658M48T08-150PC1 Datasheet

MFR RecommendedRFQ

M48T58Y-70PC1

STMicroelectronicsIn Stock: 1732M48T58Y-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS17485-5 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Parallel interface architecture
• Clock/Calendar functionality with date and time tracking
• Through-hole mounting configuration
• Operating voltage range overlap (4.5V ~ 5.5V supply)
• Operating temperature range compatibility (0°C ~ 70°C)
• DIP package form factor (physical footprint and pin count considerations)

Secondary Compatibility Factors:

• Time format support (12/24 hour or 24 hour operation)
• Date format structure (YY-MM-DD-dd)
• Leap year and calendar calculation capability
• Timekeeping current specifications

The identified substitute parts (M48T08-150PC1 and M48T58Y-70PC1) maintain functional equivalence in clock/calendar operation, parallel interface architecture, and through-hole DIP packaging. Both substitutes are manufactured by STMicroelectronics and carry active product status with modern compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

M48T58Y-70PC1 (Primary Substitute)

The M48T58Y-70PC1 provides the closest electrical and operational alignment with the DS17485-5. This device maintains identical supply voltage range (4.5V ~ 5.5V), matching timekeeping current specifications (3mA @ 4.5V ~ 5.5V), and equivalent operating temperature range (0°C ~ 70°C). Both devices support 24-hour time format and YY-MM-DD-dd date format with leap year calculation. The M48T58Y-70PC1 carries active product status and ROHS3 compliance certification, ensuring long-term availability and regulatory alignment for new designs or production continuity.

Package consideration: The M48T58Y-70PC1 uses a 28-DIP Module configuration versus the DS17485-5's 24-DIP package. PCB layout modification is required to accommodate the increased pin count and physical footprint.

M48T08-150PC1 (Secondary Substitute)

The M48T08-150PC1 offers functional clock/calendar equivalence with parallel interface architecture and through-hole DIP mounting. This device operates within a 4.75V ~ 5.5V supply range, which overlaps the DS17485-5 specification but does not extend to the lower 4.5V threshold. The M48T08-150PC1 includes watchdog timer functionality not present in the DS17485-5. Active product status and ROHS3 compliance are confirmed.

Package consideration: The 28-DIP Module configuration requires PCB redesign identical to the M48T58Y-70PC1.

Both substitutes are manufactured by STMicroelectronics under the Timekeeper® series designation, ensuring established design maturity and production stability.

Frequently Asked Questions (FAQ)

Q: Why is the DS17485-5 classified as obsolete?

A: The DS17485-5 has reached end-of-life status from the original manufacturer (Analog Devices Inc./Maxim Integrated). Obsolete classification indicates the component is no longer in active production and existing inventory is limited. Substitute parts ensure design continuity and system support.

Q: Can the M48T08-150PC1 or M48T58Y-70PC1 be used as direct pin-for-pin replacements?

A: No. The DS17485-5 uses a 24-DIP package, while both substitute parts use 28-DIP Module packages. Pin count and physical footprint differ, requiring PCB layout modification. Pin function mapping must be verified against device datasheets before implementation.

Q: What is the key difference between M48T08-150PC1 and M48T58Y-70PC1?

A: The M48T08-150PC1 operates at a minimum supply voltage of 4.75V, while the M48T58Y-70PC1 supports 4.5V minimum supply voltage, matching the DS17485-5 specification. The M48T08-150PC1 includes watchdog timer functionality. Both devices support identical time and date formats with leap year calculation.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both M48T08-150PC1 and M48T58Y-70PC1 carry ROHS3 compliance certification. The original DS17485-5 is RoHS non-compliant. Substitution may require design documentation updates to reflect improved environmental compliance status.

Q: What operating temperature range do the substitute parts support?

A: Both M48T08-150PC1 and M48T58Y-70PC1 operate across 0°C to 70°C, matching the DS17485-5 specification. No thermal performance degradation occurs with substitution.

Q: Do the substitute parts support 12-hour time format?

A: The M48T08-150PC1 and M48T58Y-70PC1 support 24-hour time format only. The DS17485-5 supports both 12-hour and 24-hour formats. Applications requiring 12-hour format operation must retain the original DS17485-5 or identify alternative solutions.

Q: What is the battery backup voltage requirement for the substitute parts?

A: Battery backup voltage specifications are not provided for the M48T08-150PC1 and M48T58Y-70PC1 in the available technical data. The DS17485-5 specifies 2.5V to 3.7V battery backup range. Detailed datasheets must be consulted to confirm battery backup compatibility before implementation.

Q: Are alarm and daylight savings features available in the substitute parts?

A: The substitute parts do not list alarm or daylight savings functionality in the provided specifications. The DS17485-5 includes both features. Applications dependent on these functions require verification against complete device datasheets or identification of alternative components.