DS1500WN Equivalent & Substitute Parts

Part Overview

The DS1500WN is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality manufactured by Analog Devices Inc./Maxim Integrated. This 32-DIP through-hole module 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 capabilities. The device operates across a 3V to 3.6V supply range with battery backup support from 2.5V to 3.7V.

The DS1500WN is classified as obsolete. Locating equivalent substitute parts is necessary to support legacy system maintenance, board redesigns, and production continuity where original inventory is depleted or unavailable.

Substiute Parts

DS1500WN

Analog Devices Inc./Maxim IntegratedIn Stock: 973DS1500WN Datasheet

Current PartRFQ

M48T35AV-10PC1

STMicroelectronicsIn Stock: 1390M48T35AV-10PC1 Datasheet

MFR RecommendedRFQ

M48T35Y-70MH1F

STMicroelectronicsIn Stock: 1491M48T35Y-70MH1F Datasheet

MFR RecommendedRFQ

M48T35Y-70PC1

STMicroelectronicsIn Stock: 3110M48T35Y-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS1500WN requires alignment across the following critical parameters:

Interface & Communication: Parallel interface is mandatory for direct pin compatibility.

Package & Mounting: Through-hole DIP packaging is required for PCB socket compatibility. Pin count and physical dimensions (0.600" width) determine mechanical fit.

Electrical Specifications: Supply voltage range (3V ~ 3.6V primary, 2.5V ~ 3.7V battery backup), timekeeping current consumption, and operating temperature range (-40°C ~ 85°C) define functional compatibility.

Timekeeping Functionality: Time format (HH:MM:SS, 24-hour), date format (YY-MM-DD-dd), and core RTC features (leap year, alarm capability) must be present.

The three substitute parts identified operate under different voltage and temperature constraints, requiring careful selection based on system requirements.

Parameter Comparison

Engineering Selection Recommendations

M48T35AV-10PC1 (STMicroelectronics): This substitute maintains through-hole DIP packaging with 0.600" width and parallel interface compatibility. It operates within the 3V ~ 3.6V supply range matching the DS1500WN primary voltage specification. Operating temperature range is reduced to 0°C ~ 70°C, which may not satisfy applications requiring the full -40°C ~ 85°C range of the original part. The device is ROHS3 compliant and carries active product status, ensuring long-term availability. Pin count is reduced from 32 to 28, requiring PCB layout modification.

M48T35Y-70MH1F (STMicroelectronics): This substitute employs surface-mount 28-SOP packaging, fundamentally incompatible with through-hole socket designs. Supply voltage requirement is 4.5V ~ 5.5V, outside the DS1500WN's 3V ~ 3.6V specification. This part is suitable only for new designs or complete board redesigns with appropriate voltage regulation. ROHS3 compliance and active status are present. Moisture sensitivity level is elevated to MSL 3 (168 hours), requiring controlled storage conditions.

M48T35Y-70PC1 (STMicroelectronics): This substitute provides through-hole 28-DIP packaging with 0.600" width and parallel interface. Supply voltage is 4.5V ~ 5.5V, requiring system voltage adjustment or regulation from the original 3V ~ 3.6V specification. Operating temperature range is 0°C ~ 70°C. The device is ROHS3 compliant with active product status. Pin count reduction from 32 to 28 requires PCB modification. This option is most suitable for systems capable of operating at 5V logic levels.

Frequently Asked Questions (FAQ)

Q: Can M48T35AV-10PC1 directly replace DS1500WN without PCB modification?

A: No. While both use through-hole 32-DIP and 28-DIP packaging with 0.600" width, the pin count differs (32 vs. 28). PCB socket modification or adapter circuitry is required. Additionally, operating temperature range is reduced from -40°C ~ 85°C to 0°C ~ 70°C.

Q: What is the primary difference between M48T35Y-70MH1F and M48T35Y-70PC1?

A: M48T35Y-70MH1F uses surface-mount 28-SOP packaging, while M48T35Y-70PC1 uses through-hole 28-DIP packaging. M48T35Y-70MH1F requires SMD assembly capability and is incompatible with through-hole socket designs. Both require 4.5V ~ 5.5V supply voltage.

Q: Is the DS1500WN's -40°C ~ 85°C operating temperature range critical for substitution?

A: All three substitute parts operate only to 0°C ~ 70°C. If the application requires operation below 0°C or above 70°C, none of these substitutes are suitable without thermal management modifications or alternative sourcing.

Q: Do the substitute parts support the same memory size and features as DS1500WN?

A: The substitute parts provide parallel interface RTC functionality with leap year support and 24-hour time format. Memory size specifications are not provided for the M48T35 series in the available data. Feature parity (alarm, NVSRAM, square wave output, watchdog timer) cannot be confirmed from the provided parameters.

Q: What voltage supply consideration is most important when selecting a substitute?

A: The DS1500WN operates at 3V ~ 3.6V. M48T35AV-10PC1 maintains this voltage range. Both M48T35Y-70MH1F and M48T35Y-70PC1 require 4.5V ~ 5.5V supply. System power architecture must support the selected substitute's voltage requirement.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts carry ROHS3 compliance status. The original DS1500WN is RoHS non-compliant. Substitution with any of these parts improves environmental compliance posture.