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 through-hole component provides 4KB of parallel interface memory with alarm, daylight savings, leap year, and NVSRAM capabilities. The product is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations where legacy compatibility is required.

Substiute Parts

DS17485-5+

Analog Devices Inc./Maxim IntegratedIn Stock: 749DS17485-5+ 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 for the DS17485-5+ is determined by the following critical parameters:

Primary Substitution Criteria:

• Parallel interface architecture
• Clock/Calendar functionality with time and date tracking
• Through-hole mounting compatibility
• Supply voltage range overlap (4.5V ~ 5.5V minimum requirement)
• Operating temperature range compatibility (0°C ~ 70°C)
• RoHS3 compliance and REACH unaffected status

Package Consideration: The DS17485-5+ uses a 24-DIP package. Substitute parts identified (M48T08-150PC1 and M48T58Y-70PC1) use 28-DIP packages. While both are through-hole DIP formats with 0.600" (15.24mm) body width, the pin count difference requires PCB layout verification before implementation.

Functional Equivalence: Both substitute parts maintain parallel interface operation, clock/calendar functionality, and core timekeeping specifications. The M48T58Y-70PC1 provides the closest electrical parameter alignment with the DS17485-5+, including matching supply voltage range (4.5V ~ 5.5V) and timekeeping current specifications (3mA @ 4.5V ~ 5.5V).

Parameter Comparison

Engineering Selection Recommendations

M48T58Y-70PC1 (Primary Substitute): This part provides the closest electrical parameter alignment to the DS17485-5+. The matching supply voltage range (4.5V ~ 5.5V) and identical timekeeping current specification (3mA @ 4.5V ~ 5.5V) ensure direct functional compatibility in power-constrained applications. Active product status and ROHS3 compliance support long-term availability and regulatory compliance. The 28-DIP package requires PCB layout modification from the original 24-DIP footprint.

M48T08-150PC1 (Secondary Substitute): This part operates within a narrower supply voltage range (4.75V ~ 5.5V), which excludes operation at the DS17485-5+ minimum specification of 4.5V. Selection of this part is appropriate only for systems with regulated 5V supplies that maintain minimum 4.75V operation. Active product status and ROHS3 compliance are maintained. The inclusion of a watchdog timer provides additional functionality not present in the original part.

Both substitute parts are manufactured by STMicroelectronics under the Timekeeper® series, ensuring established design maturity and supply chain stability. PCB layout redesign is mandatory due to package pin count differences (24-pin to 28-pin).

Frequently Asked Questions (FAQ)

Q: Can M48T58Y-70PC1 and M48T08-150PC1 be used interchangeably with DS17485-5+?

A: Both parts provide clock/calendar functionality with parallel interface operation compatible with DS17485-5+ system requirements. However, the 28-DIP package requires PCB layout modification. M48T58Y-70PC1 is preferred due to matching supply voltage range (4.5V ~ 5.5V). M48T08-150PC1 operates at minimum 4.75V, restricting use to regulated 5V systems.

Q: What is the primary difference between the two substitute parts?

A: M48T58Y-70PC1 matches the DS17485-5+ supply voltage range (4.5V ~ 5.5V) and provides core clock/calendar functionality. M48T08-150PC1 operates at 4.75V ~ 5.5V and includes a watchdog timer feature. Both maintain identical timekeeping current specifications and operating temperature ranges.

Q: Does the package change from 24-DIP to 28-DIP affect compatibility?

A: Yes. The pin count increase from 24 to 28 requires PCB layout redesign. Both packages maintain 0.600" (15.24mm) body width and through-hole mounting, but pinout differs. Schematic and PCB modifications are necessary before implementation.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both M48T58Y-70PC1 and M48T08-150PC1 are ROHS3 compliant and REACH unaffected, matching the compliance status of the DS17485-5+.

Q: What features are lost when substituting to M48T58Y-70PC1?

A: The M48T58Y-70PC1 does not include alarm, daylight savings, or square wave output features present in the DS17485-5+. Functional requirements for these features must be evaluated before selection.

Q: What is the supply voltage consideration for M48T08-150PC1?

A: M48T08-150PC1 requires minimum 4.75V supply, compared to DS17485-5+ minimum of 4.5V. Systems with unregulated or marginal 5V supplies may not meet this requirement. M48T58Y-70PC1 is recommended for applications requiring 4.5V operation.