DS1501WSN Equivalent & Substitute Parts

Part Overview

The DS1501WSN is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This device provides parallel interface timekeeping with 256 bytes of NVSRAM, alarm capability, leap year support, square wave output, and watchdog timer functionality in a 28-SOIC surface mount package.

The DS1501WSN is classified as obsolete. Locating equivalent substitute parts is necessary for new designs, production continuity, and system upgrades where this component is no longer readily available or preferred for long-term supply chain stability.

Substiute Parts

DS1501WSN

Analog Devices Inc./Maxim IntegratedIn Stock: 2298DS1501WSN Datasheet

Current PartRFQ

BQ4802LYPWR

Texas InstrumentsIn Stock: 28912BQ4802LYPWR Datasheet

MFR RecommendedRFQ

M48T35AV-10PC1

STMicroelectronicsIn Stock: 1390M48T35AV-10PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DS1501WSN are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Interface type: Parallel (required for direct pin-level compatibility)
• Device category: Clock/Calendar RTC IC
• Time format: 24-hour capability (DS1501WSN operates in 24-hour format)
• Date format: YY-MM-DD-dd support
• Supply voltage overlap: Minimum 3V ~ 3.6V operating range
• Mounting type: Surface mount preferred for modern PCB designs
• Package pin count: 28-pin configuration

Substitute Parts Identified:

1. BQ4802LYPWR (Texas Instruments) – Active product, surface mount 28-TSSOP package, parallel interface, supports 12/24-hour time format, operating voltage 2.7V ~ 3.6V, RoHS3 compliant.

2. M48T35AV-10PC1 (STMicroelectronics) – Active product, through-hole 28-DIP package, parallel interface, 24-hour time format, operating voltage 3V ~ 3.6V, RoHS3 compliant.

Parameter Comparison

Engineering Selection Recommendations

BQ4802LYPWR (Texas Instruments)

This substitute is an active product with ROHS3 compliance. The BQ4802LYPWR operates within the DS1501WSN supply voltage range (2.7V ~ 3.6V overlaps with 3V ~ 3.6V requirement) and provides parallel interface Clock/Calendar functionality with 24-hour time format support. The 28-TSSOP surface mount package is compatible with modern PCB layouts. Timekeeping current consumption is lower (1.5mA typical) compared to the DS1501WSN (4mA maximum). Operating temperature range is 0°C ~ 70°C, which is narrower than the DS1501WSN (-40°C ~ 85°C). This substitute is suitable for applications within the 0°C ~ 70°C temperature window.

M48T35AV-10PC1 (STMicroelectronics)

This substitute is an active product with ROHS3 compliance and operates within the DS1501WSN supply voltage range (3V ~ 3.6V). The M48T35AV-10PC1 provides parallel interface Clock/Calendar functionality with 24-hour time format and YY-MM-DD-dd date format support. The 28-DIP through-hole package requires PCB redesign if the original design uses surface mount footprints. Timekeeping current consumption is 2mA at 3V ~ 3.6V, which is lower than the DS1501WSN. Operating temperature range is 0°C ~ 70°C. This substitute is suitable for applications within the 0°C ~ 70°C temperature window and where through-hole mounting is acceptable.

Frequently Asked Questions (FAQ)

Q: Can BQ4802LYPWR directly replace DS1501WSN on the same PCB?

A: No. The BQ4802LYPWR uses a 28-TSSOP surface mount package, while the DS1501WSN uses a 28-SOIC package. Although both are surface mount, the pin pitch and footprint dimensions differ. PCB layout modification is required. Pin-level compatibility must be verified against the respective datasheets.

Q: Can M48T35AV-10PC1 directly replace DS1501WSN on the same PCB?

A: No. The M48T35AV-10PC1 uses a 28-DIP through-hole package, while the DS1501WSN uses a 28-SOIC surface mount package. PCB redesign is necessary to accommodate the different mounting type and footprint. Pin-level compatibility must be verified against the respective datasheets.

Q: What is the temperature limitation when using BQ4802LYPWR or M48T35AV-10PC1?

A: Both substitutes operate within 0°C ~ 70°C. The DS1501WSN operates within -40°C ~ 85°C. If the application requires operation below 0°C or above 70°C, these substitutes are not suitable.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both BQ4802LYPWR and M48T35AV-10PC1 are ROHS3 compliant. The DS1501WSN is RoHS non-compliant. If RoHS compliance is a requirement, either substitute part satisfies this criterion.

Q: Do the substitute parts support the same memory size as DS1501WSN?

A: The DS1501WSN provides 256B NVSRAM. Memory size specifications for BQ4802LYPWR and M48T35AV-10PC1 are not provided in the available data. Memory capacity must be verified against the respective manufacturer datasheets before final selection.

Q: What is the primary difference in timekeeping current consumption?

A: The DS1501WSN draws 4mA maximum at 3V ~ 3.6V. The BQ4802LYPWR draws 1.5mA typical at 2.7V ~ 3.6V. The M48T35AV-10PC1 draws 2mA at 3V ~ 3.6V. Both substitutes consume less power during timekeeping operation.