DS1500WE+ Equivalent & Substitute Parts Reference

Part Overview

The DS1500WE+ is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Analog Devices Inc./Maxim Integrated. This device features 256B parallel NVSRAM, alarm capability, leap year support, square wave output, watchdog timer, and Y2K compliance in a 32-LFSOP surface mount package. The product is currently obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations where legacy compatibility is required.

Substiute Parts

DS1500WE+

Analog Devices Inc./Maxim IntegratedIn Stock: 654DS1500WE+ Datasheet

Current PartRFQ

M48T201V-85MH1F

STMicroelectronicsIn Stock: 1609M48T201V-85MH1F Datasheet

MFR RecommendedRFQ

M48T35AV-10MH1F

STMicroelectronicsIn Stock: 5879M48T35AV-10MH1F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DS1500WE+ is determined by the following critical parameters that must align across candidate parts:

Core Functional Requirements:

• Interface type: Parallel
• Time format: HH:MM:SS (24 hr)
• Date format: YY-MM-DD-dd
• Operating temperature range: 0°C ~ 70°C
• Supply voltage compatibility: 3V ~ 3.6V nominal operation

Compliance & Certification:

• RoHS3 compliance
• REACH unaffected status
• Moisture sensitivity level: 3 (168 Hours)

Physical Constraints:

• Surface mount technology
• Package compatibility with system PCB layout

The identified substitute parts maintain functional equivalence through parallel interface architecture, identical time/date format support, overlapping voltage specifications, and matching compliance certifications. Package form factors differ, requiring PCB layout evaluation during implementation.

Parameter Comparison

Engineering Selection Recommendations

M48T201V-85MH1F (STMicroelectronics Timekeeper® Series)

This substitute maintains full functional compatibility with the DS1500WE+ across all critical parameters: parallel interface, 24-hour time format, YY-MM-DD-dd date format, 3V ~ 3.6V supply voltage, and 0°C ~ 70°C operating temperature range. The device is in active production status with ROHS3 compliance and matching MSL rating. Timekeeping current consumption is reduced to 2mA compared to the original 4mA specification. Package form factor differs (44-BSOP vs. 32-LFSOP), requiring PCB layout redesign. This part includes supervisor and watchdog timer features.

M48T35AV-10MH1F (STMicroelectronics Timekeeper® Series)

This substitute provides functional equivalence through identical parallel interface, time/date format support, supply voltage range, and operating temperature specifications. Active product status with ROHS3 compliance and MSL 3 rating ensures regulatory alignment. Timekeeping current is 2mA at 3V ~ 3.6V. Package configuration is 28-SOP (0.350", 8.89mm Width), differing from the original 32-LFSOP package and requiring PCB layout modification. This part features leap year support and includes SNAPHAT socket compatibility.

Both substitute parts are manufactured by STMicroelectronics, carry active product status, and maintain compliance certifications equivalent to the obsolete DS1500WE+. Selection between these options depends on PCB layout constraints and specific feature requirements (supervisor/watchdog vs. SNAPHAT socket compatibility).

Frequently Asked Questions (FAQ)

Q: Can M48T201V-85MH1F or M48T35AV-10MH1F be used as direct pin-for-pin replacements for DS1500WE+?

A: No. While both substitute parts maintain functional equivalence through parallel interface architecture and identical time/date format support, they use different package form factors (44-BSOP and 28-SOP respectively versus the original 32-LFSOP). PCB layout redesign is required for implementation.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: parallel interface type, HH:MM:SS (24 hr) time format, YY-MM-DD-dd date format, 3V ~ 3.6V supply voltage range, 0°C ~ 70°C operating temperature, surface mount technology, ROHS3 compliance, and MSL 3 rating. All identified substitutes meet these criteria.

Q: How do the timekeeping current specifications compare?

A: The DS1500WE+ specifies 4mA maximum timekeeping current at 3V ~ 3.6V. Both substitute parts (M48T201V-85MH1F and M48T35AV-10MH1F) operate at 2mA under identical conditions, representing a 50% reduction in timekeeping power consumption.

Q: What is the significance of product status (Obsolete vs. Active)?

A: The DS1500WE+ is obsolete, meaning it is no longer manufactured and existing inventory is limited. The substitute parts M48T201V-85MH1F and M48T35AV-10MH1F are in active production, ensuring long-term availability and supply chain reliability for new designs and ongoing system support.

Q: Are there differences in battery supply voltage specifications?

A: Yes. The DS1500WE+ supports battery supply voltage of 2.5V ~ 3.7V. The M48T201V-85MH1F specifies 3V battery supply, while the M48T35AV-10MH1F does not specify a battery supply voltage parameter in the provided data. This difference should be evaluated against specific system backup power requirements.

Q: What compliance certifications apply to these parts?

A: All three parts (DS1500WE+, M48T201V-85MH1F, and M48T35AV-10MH1F) are ROHS3 compliant, REACH unaffected, and carry MSL 3 (168 Hours) moisture sensitivity ratings. These certifications ensure regulatory alignment for industrial and commercial applications.

Q: How do the feature sets differ between the main part and substitutes?

A: The DS1500WE+ includes alarm, leap year, NVSRAM, square wave output, watchdog timer, and Y2K features. The M48T201V-85MH1F includes alarm, leap year, square wave output, supervisor, watchdog timer, and Y2K features. The M48T35AV-10MH1F includes leap year support and SNAPHAT socket compatibility. Feature alignment should be verified against specific application requirements.