DS1685E-5+ Equivalent & Substitute Parts

Part Overview

The DS1685E-5+ is an Active status Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This surface mount device operates across 4.5V to 5.5V supply voltage with battery backup capability (2.5V to 3.7V), making it suitable for applications requiring reliable timekeeping with non-volatile storage. The 24-TSSOP package provides compact integration for modern embedded systems. Alternative models become necessary when design constraints require different package formats, mounting technologies, or when primary inventory is unavailable.

Substiute Parts

DS1685E-5+

Analog Devices Inc./Maxim IntegratedIn Stock: 3449DS1685E-5+ Datasheet

Current PartRFQ

DS1685E-5+

Analog Devices Inc./Maxim IntegratedIn Stock: 3449DS1685E-5+ Datasheet

DirectRFQ

M48T18-150PC1

STMicroelectronicsIn Stock: 1310M48T18-150PC1 Datasheet

MFR RecommendedRFQ

M48T58Y-70PC1

STMicroelectronicsIn Stock: 1732M48T58Y-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS1685E-5+ is determined by the following critical parameters:

Primary Compatibility Criteria:

• Parallel interface architecture
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C
• Clock/Calendar functionality with date and time tracking
• RoHS3 compliance and REACH unaffected status

Package and Mounting Considerations: The DS1685E-5+ uses 24-TSSOP surface mount packaging. Substitute parts may employ different package formats (28-DIP through-hole) when design requirements permit PCB layout modifications or when through-hole mounting is preferred over surface mount technology.

Identified Substitute Parts:

1. DS1685E-5+ (Direct equivalent) – Identical specifications, same manufacturer, same package
2. M48T18-150PC1 (STMicroelectronics) – Timekeeper® series, 28-DIP through-hole package, compatible voltage and temperature ranges
3. M48T58Y-70PC1 (STMicroelectronics) – Timekeeper® series, 28-DIP through-hole package, compatible voltage and temperature ranges

Parameter Comparison

Engineering Selection Recommendations

DS1685E-5+ (Direct Equivalent) Select this part when surface mount 24-TSSOP packaging is required and inventory availability is confirmed. All electrical and functional specifications remain identical to the original design requirement.

M48T18-150PC1 (STMicroelectronics Timekeeper®) This substitute is applicable when through-hole mounting technology is acceptable and PCB layout can accommodate the larger 28-DIP Module footprint (0.600", 15.24mm). Electrical compatibility is maintained across supply voltage (4.5V ~ 5.5V) and operating temperature (0°C ~ 70°C) ranges. The Timekeeper® series includes watchdog timer functionality not present in the DS1685E-5+. Product status is Active with ROHS3 compliance and MSL 1 rating.

M48T58Y-70PC1 (STMicroelectronics Timekeeper®) This substitute operates under identical electrical and thermal constraints as M48T18-150PC1, with equivalent 28-DIP Module packaging. The primary distinction is the inclusion of leap year functionality. Product status is Active with ROHS3 compliance and MSL 1 rating. Selection between M48T18-150PC1 and M48T58Y-70PC1 depends on specific leap year handling requirements in the application.

All substitute parts maintain Active product status, ROHS3 compliance, and REACH unaffected designation, ensuring regulatory alignment with the original DS1685E-5+ specification.

Frequently Asked Questions (FAQ)

Q: Can M48T18-150PC1 or M48T58Y-70PC1 directly replace DS1685E-5+ on an existing PCB?

A: Direct PCB replacement is not possible due to package format differences. DS1685E-5+ uses 24-TSSOP surface mount packaging, while M48T18-150PC1 and M48T58Y-70PC1 use 28-DIP through-hole modules. PCB redesign is required to accommodate the different footprint and mounting technology.

Q: What are the key electrical compatibility factors between these parts?

A: All three parts operate within identical supply voltage ranges (4.5V ~ 5.5V), maintain equivalent timekeeping current specifications (3mA), and support the same operating temperature range (0°C ~ 70°C). Parallel interface architecture is consistent across all options.

Q: How do the time and date formats differ between these parts?

A: DS1685E-5+ supports both 12-hour and 24-hour time formats, while M48T18-150PC1 and M48T58Y-70PC1 operate exclusively in 24-hour format. All three parts use identical date format (YY-MM-DD-dd) with day-of-week tracking.

Q: What additional features do the STMicroelectronics Timekeeper® parts provide?

A: M48T18-150PC1 includes watchdog timer functionality. M48T58Y-70PC1 includes leap year functionality. The DS1685E-5+ provides alarm, NVSRAM, square wave output, and Y2K features.

Q: Are all parts RoHS compliant?

A: Yes. DS1685E-5+, M48T18-150PC1, and M48T58Y-70PC1 are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating and REACH unaffected status.

Q: Which part should be selected for new designs?

A: For surface mount applications, DS1685E-5+ is the appropriate selection. For through-hole designs, choose between M48T18-150PC1 (with watchdog timer) or M48T58Y-70PC1 (with leap year support) based on functional requirements.