DS1501WN+ Equivalent & Substitute Parts Reference

Part Overview

The DS1501WN+ is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This 28-DIP through-hole component provides 256 bytes of parallel interface memory with comprehensive timekeeping features including alarm, leap year compensation, non-volatile SRAM, square wave output, and watchdog timer functionality. The DS1501WN+ is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations. Substitute parts must maintain functional compatibility across time format, date format, parallel interface architecture, and core RTC capabilities while accommodating differences in packaging, voltage specifications, and operating temperature ranges.

Substiute Parts

DS1501WN+

Analog Devices Inc./Maxim IntegratedIn Stock: 1149DS1501WN+ Datasheet

Current PartRFQ

M48T35AV-10MH1F

STMicroelectronicsIn Stock: 5879M48T35AV-10MH1F Datasheet

MFR RecommendedRFQ

M48T58Y-70PC1

STMicroelectronicsIn Stock: 1732M48T58Y-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS1501WN+ is determined by strict alignment of the following critical parameters:

Interface & Protocol Compatibility: All substitute parts must maintain parallel interface architecture with HH:MM:SS (24 hr) time format and YY-MM-DD-dd date format to ensure firmware and hardware compatibility without redesign.

Core RTC Functionality: Substitute parts must provide Clock/Calendar functionality with leap year compensation as minimum feature set.

Voltage & Power Specifications: Substitute parts are grouped into two categories based on supply voltage requirements: 3V ~ 3.6V supply voltage (matching DS1501WN+ primary supply) or 4.5V ~ 5.5V supply voltage (requiring circuit redesign). Battery backup voltage specifications are secondary selection criteria.

Packaging & Mounting: Substitute parts are available in two mounting configurations: Through Hole (28-DIP) for direct pin-compatible replacement, or Surface Mount (28-SOP) for redesigned PCB layouts.

Product Status & Compliance: Active product status with ROHS3 compliance and REACH unaffected status ensures long-term availability and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

M48T35AV-10MH1F Selection Criteria: This STMicroelectronics Timekeeper® series component maintains 3V ~ 3.6V supply voltage compatibility with DS1501WN+ and provides superior timekeeping current efficiency (2mA vs. 4mA). Active product status ensures long-term availability. Surface mount 28-SOP packaging requires PCB redesign but enables modern manufacturing processes. Operating temperature range 0°C ~ 70°C is narrower than DS1501WN+; applications requiring -40°C ~ 85°C operation require thermal analysis. MSL rating 3 (168 Hours) requires controlled storage conditions compared to MSL 1 unlimited rating of DS1501WN+.

M48T58Y-70PC1 Selection Criteria: This STMicroelectronics Timekeeper® series component provides direct through-hole 28-DIP packaging compatibility, enabling pin-for-pin replacement without PCB redesign. Active product status ensures long-term supply. Supply voltage specification 4.5V ~ 5.5V requires circuit redesign for systems designed around 3V ~ 3.6V supply. Operating temperature range 0°C ~ 70°C is narrower than DS1501WN+; applications requiring -40°C ~ 85°C operation require thermal analysis. MSL rating 1 (Unlimited) matches DS1501WN+ storage requirements.

Both substitute parts maintain parallel interface architecture, HH:MM:SS (24 hr) time format, YY-MM-DD-dd date format, and leap year compensation required for functional compatibility. Selection between M48T35AV-10MH1F and M48T58Y-70PC1 depends on packaging constraints (surface mount vs. through hole) and supply voltage requirements (3V vs. 5V).

Frequently Asked Questions (FAQ)

Q: Can M48T35AV-10MH1F directly replace DS1501WN+ without PCB modification?

A: No. M48T35AV-10MH1F uses 28-SOP surface mount packaging while DS1501WN+ uses 28-DIP through-hole packaging. PCB redesign is required. M48T58Y-70PC1 provides through-hole 28-DIP packaging for direct replacement.

Q: What are the voltage compatibility differences between substitute parts?

A: DS1501WN+ operates at 3V ~ 3.6V supply voltage. M48T35AV-10MH1F maintains this 3V ~ 3.6V specification. M48T58Y-70PC1 requires 4.5V ~ 5.5V supply voltage, necessitating power supply circuit redesign.

Q: Are operating temperature ranges equivalent across all parts?

A: No. DS1501WN+ operates across -40°C ~ 85°C. Both M48T35AV-10MH1F and M48T58Y-70PC1 operate across 0°C ~ 70°C. Applications requiring full -40°C ~ 85°C operation must evaluate thermal performance of substitute parts.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: DS1501WN+ and M48T58Y-70PC1 have MSL 1 (Unlimited), allowing indefinite storage without moisture control. M48T35AV-10MH1F has MSL 3 (168 Hours), requiring controlled storage conditions and baking procedures before reflow soldering.

Q: Do substitute parts maintain all features of DS1501WN+?

A: M48T35AV-10MH1F and M48T58Y-70PC1 provide leap year compensation and parallel interface Clock/Calendar functionality. DS1501WN+ includes additional features: alarm, NVSRAM, square wave output, watchdog timer, and Y2K compensation. Substitute parts do not provide all original features; application requirements must determine if feature reduction is acceptable.

Q: What is the timekeeping current difference between parts?

A: DS1501WN+ draws 4mA @ 3V ~ 3.6V. M48T35AV-10MH1F draws 2mA @ 3V ~ 3.6V (50% reduction). M48T58Y-70PC1 draws 3mA @ 4.5V ~ 5.5V. Lower current consumption in M48T35AV-10MH1F may extend battery backup duration in battery-backed applications.

Q: Are all parts ROHS3 compliant and REACH unaffected?

A: Yes. DS1501WN+, M48T35AV-10MH1F, and M48T58Y-70PC1 are all ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.