DS1501Y+ Equivalent & Substitute Parts

Part Overview

The DS1501Y+ is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This 28-DIP parallel interface device provides 256 bytes of NVSRAM with comprehensive timekeeping features including alarm, leap year compensation, square wave output, and watchdog timer capabilities. The DS1501Y+ is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations. Substitute parts must maintain functional compatibility across parallel interface architecture, voltage supply ranges, and core RTC/Calendar operations.

Substiute Parts

DS1501Y+

Analog Devices Inc./Maxim IntegratedIn Stock: 945DS1501Y+ Datasheet

Current PartRFQ

BQ4802YDW

BenchmarqIn Stock: 1824BQ4802YDW Datasheet

MFR RecommendedRFQ

M48T02-150PC1

STMicroelectronicsIn Stock: 1525M48T02-150PC1 Datasheet

MFR RecommendedRFQ

M48T12-150PC1

STMicroelectronicsIn Stock: 2537M48T12-150PC1 Datasheet

MFR RecommendedRFQ

M48T58-70PC1

STMicroelectronicsIn Stock: 1546M48T58-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the DS1501Y+ is determined by the following critical parameters:

Primary Compatibility Criteria:

• Parallel interface architecture
• 28-DIP through-hole package configuration (0.600", 15.24mm)
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C
• Time format: HH:MM:SS (24 hr)
• Date format: YY-MM-DD-dd
• Core RTC/Calendar functionality with leap year support

Substitute Parts Identified:

1. M48T58-70PC1 (STMicroelectronics) – Direct package and interface match with 28-DIP through-hole configuration
2. M48T12-150PC1 (STMicroelectronics) – 24-DIP through-hole alternative with compatible voltage and temperature specifications
3. M48T02-150PC1 (STMicroelectronics) – 24-DIP through-hole alternative with compatible voltage and temperature specifications
4. BQ4802YDW (Benchmarq) – Surface mount 28-SOIC alternative for designs permitting package transition

Parameter Comparison

Engineering Selection Recommendations

M48T58-70PC1 (Recommended Primary Substitute)

The M48T58-70PC1 provides the closest functional and physical compatibility with the DS1501Y+. Both devices utilize 28-DIP through-hole packaging with identical footprint dimensions (0.600", 15.24mm). The M48T58-70PC1 maintains parallel interface architecture, compatible supply voltage range (4.75V ~ 5.5V overlaps with DS1501Y+ 4.5V ~ 5.5V), and identical operating temperature specifications (0°C ~ 70°C). The device is manufactured by STMicroelectronics under the Timekeeper® series and carries active product status with ROHS3 compliance. Current consumption is reduced to 3mA compared to the DS1501Y+ specification of 5mA, providing improved power efficiency.

M48T12-150PC1 and M48T02-150PC1 (Secondary Through-Hole Alternatives)

Both M48T12-150PC1 and M48T02-150PC1 offer through-hole mounting compatibility with 24-DIP package configuration. These devices maintain parallel interface operation, compatible voltage ranges, and identical operating temperature specifications. The 24-DIP package requires PCB layout modification compared to the 28-DIP DS1501Y+. Both devices are manufactured by STMicroelectronics under the Timekeeper® series with active product status and ROHS3 compliance. Current consumption is 3mA, providing improved efficiency over the DS1501Y+.

BQ4802YDW (Surface Mount Alternative)

The BQ4802YDW provides functional RTC/Calendar capability with parallel interface and compatible voltage/temperature specifications. This device utilizes 28-SOIC surface mount packaging, requiring significant PCB layout redesign from the through-hole DS1501Y+ configuration. The BQ4802YDW is manufactured by Benchmarq with active product status. Current consumption is 1.5mA typical, providing superior power efficiency. This option is suitable only for designs permitting surface mount technology transition.

Frequently Asked Questions (FAQ)

Q: Can the M48T58-70PC1 be used as a direct replacement for the DS1501Y+ without PCB modification?

A: Yes. The M48T58-70PC1 utilizes identical 28-DIP through-hole packaging (0.600", 15.24mm) as the DS1501Y+, enabling direct socket compatibility without PCB layout changes. Both devices operate on parallel interface architecture with compatible supply voltage and temperature specifications.

Q: What are the key differences between M48T58-70PC1, M48T12-150PC1, and M48T02-150PC1?

A: M48T58-70PC1 maintains 28-DIP packaging matching the DS1501Y+ footprint. M48T12-150PC1 and M48T02-150PC1 utilize 24-DIP packaging, requiring PCB modification. All three devices are manufactured by STMicroelectronics with active product status, parallel interface operation, and compatible voltage/temperature ranges. Current consumption is 3mA for all three alternatives.

Q: Is the BQ4802YDW suitable for direct replacement applications?

A: The BQ4802YDW is not suitable for direct socket replacement due to surface mount 28-SOIC packaging versus the through-hole 28-DIP configuration of the DS1501Y+. This device requires complete PCB redesign and is recommended only for new designs where surface mount technology is specified.

Q: What is the impact of supply voltage range differences between DS1501Y+ and substitute parts?

A: The DS1501Y+ operates at 4.5V ~ 5.5V. M48T58-70PC1 and M48T02-150PC1 operate at 4.75V ~ 5.5V, requiring minimum supply voltage of 4.75V. M48T12-150PC1 and BQ4802YDW maintain the full 4.5V ~ 5.5V range. Verify system supply voltage specifications before selection.

Q: Are all substitute parts RoHS3 compliant?

A: M48T58-70PC1, M48T12-150PC1, and M48T02-150PC1 are ROHS3 compliant. BQ4802YDW RoHS status is not specified in available documentation.

Q: What is the advantage of reduced current consumption in substitute parts?

A: Substitute parts consume 3mA (M48T58-70PC1, M48T12-150PC1, M48T02-150PC1) or 1.5mA typical (BQ4802YDW) compared to the DS1501Y+ specification of 5mA. This reduction improves system power efficiency and reduces thermal load, particularly in battery-backed timekeeping applications.

Q: Can the 24-DIP alternatives be used in existing DS1501Y+ socket designs?

A: No. The 24-DIP package (M48T12-150PC1, M48T02-150PC1) is not compatible with 28-DIP sockets. PCB modification is required, including socket replacement or custom adapter implementation.