DS1501WEN/T&R Equivalent & Substitute Parts

Part Overview

The DS1501WEN/T&R is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This device provides timekeeping with alarm, leap year compensation, non-volatile SRAM (NVSRAM), square wave output, and watchdog timer capabilities in a 28-TSSOP surface mount package.

The DS1501WEN/T&R is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability for production, and support long-term product maintenance where original components are no longer readily available.

Substiute Parts

DS1501WEN/T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 699DS1501WEN/T&R Datasheet

Current PartRFQ

M48T12-70PC1

STMicroelectronicsIn Stock: 2150M48T12-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS1501WEN/T&R is determined by the following critical parameters:

Interface & Functionality: The device must provide parallel interface Clock/Calendar functionality with timekeeping capability in HH:MM:SS (24 hr) format and date tracking in YY-MM-DD-dd format.

Electrical Specifications: Supply voltage range, battery backup voltage range, and timekeeping current consumption define the power delivery requirements and battery life characteristics.

Package & Mounting: The 28-TSSOP surface mount package is a primary constraint. Substitute parts with different package types (such as DIP modules) represent design changes requiring PCB layout modifications and are classified as design alternatives rather than direct substitutes.

Memory & Features: The 256B memory capacity and feature set (alarm, leap year, NVSRAM, square wave output, watchdog timer, Y2K) establish the functional scope.

Compliance & Status: Product status (active vs. obsolete) and RoHS/REACH compliance affect long-term availability and regulatory requirements.

The identified substitute M48T12-70PC1 differs significantly in package type (24-DIP Module vs. 28-TSSOP), mounting method (through-hole vs. surface mount), and electrical specifications (4.5V ~ 5.5V supply vs. 3V ~ 3.6V), indicating this is a functional alternative for applications where package constraints can be accommodated.

Parameter Comparison

Engineering Selection Recommendations

For Direct Package Compatibility: The DS1501WEN/T&R operates in a 28-TSSOP surface mount package. No substitute part with identical package type is provided in the available data. Direct package-compatible alternatives must be sourced from the base product number DS1501 family or equivalent manufacturers offering 28-TSSOP RTC solutions.

For Functional Equivalence with Design Modifications: The M48T12-70PC1 provides Clock/Calendar functionality with parallel interface and matching time/date formats. However, this substitute requires design changes:

• Package transition from 28-TSSOP (surface mount) to 24-DIP Module (through-hole) necessitates PCB layout redesign
• Supply voltage shift from 3V ~ 3.6V to 4.5V ~ 5.5V requires power supply circuit modification
• Operating temperature range reduction from -40°C ~ 85°C to 0°C ~ 70°C may affect applications requiring extended temperature operation
• Product status is active with ROHS3 compliance, supporting long-term availability and regulatory requirements

For Obsolete Component Replacement: Given the DS1501WEN/T&R obsolete status, new designs should evaluate active Clock/Calendar RTC solutions from the DS1501 family or equivalent manufacturers offering 28-TSSOP packages with 3V ~ 3.6V supply specifications to maintain form factor and electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the M48T12-70PC1 be used as a direct replacement for the DS1501WEN/T&R?

A: No. While both devices provide Clock/Calendar functionality with parallel interface and matching time/date formats, they differ in package type, mounting method, and supply voltage. The M48T12-70PC1 requires PCB redesign and power supply modification. This is a functional alternative, not a direct substitute.

Q: What are the critical differences between these parts?

A: The primary differences are: (1) Package type—DS1501WEN/T&R uses 28-TSSOP surface mount; M48T12-70PC1 uses 24-DIP through-hole; (2) Supply voltage—DS1501WEN/T&R operates at 3V ~ 3.6V; M48T12-70PC1 requires 4.5V ~ 5.5V; (3) Operating temperature—DS1501WEN/T&R supports -40°C ~ 85°C; M48T12-70PC1 supports 0°C ~ 70°C; (4) Product status—DS1501WEN/T&R is obsolete; M48T12-70PC1 is active.

Q: Why is the DS1501WEN/T&R classified as obsolete?

A: The DS1501WEN/T&R is listed as obsolete by the manufacturer, indicating it is no longer in active production. This status affects component availability and long-term supply chain support.

Q: What compliance certifications apply to these parts?

A: The DS1501WEN/T&R is RoHS non-compliant and REACH unaffected. The M48T12-70PC1 is ROHS3 compliant and REACH unaffected. For applications requiring RoHS compliance, the M48T12-70PC1 meets this requirement; the DS1501WEN/T&R does not.

Q: Are there package-compatible alternatives available?

A: The provided data does not include substitute parts with identical 28-TSSOP packaging. For package-compatible alternatives, consult the DS1501 base product family or equivalent manufacturers offering 28-TSSOP Clock/Calendar RTC solutions with 3V ~ 3.6V supply specifications.

Q: What is the impact of the supply voltage difference?

A: The DS1501WEN/T&R operates at 3V ~ 3.6V (low voltage), while the M48T12-70PC1 requires 4.5V ~ 5.5V (standard logic voltage). This difference requires separate power supply circuits and affects battery backup voltage specifications. Applications designed for 3V operation cannot use the M48T12-70PC1 without power supply redesign.