DS17285-3+ Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The DS17285-3+ is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Analog Devices Inc./Maxim Integrated. This device integrates a 2KB parallel interface memory with comprehensive timekeeping capabilities including alarm, daylight savings, leap year compensation, and square wave output. The part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing system support where continued availability is required.

Substiute Parts

DS17285-3+

Analog Devices Inc./Maxim IntegratedIn Stock: 1145DS17285-3+ Datasheet

Current PartRFQ

BQ4802LYDWR

Texas InstrumentsIn Stock: 3828BQ4802LYDWR Datasheet

MFR RecommendedRFQ

DP8573AVX/NOPB

National SemiconductorIn Stock: 1484DP8573AVX/NOPB Datasheet

MFR RecommendedRFQ

M48T201Y-70MH1F

STMicroelectronicsIn Stock: 2083M48T201Y-70MH1F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DS17285-3+ are selected based on functional equivalence in the following core parameters:

Primary Substitution Criteria:

• Clock/Calendar functionality with parallel interface
• Time format support: HH:MM:SS (12/24 hr)
• Date format support: YY-MM-DD-dd
• Alarm and leap year compensation features
• ROHS3 compliance and EAR99 classification

Secondary Compatibility Factors:

• Supply voltage ranges (primary part operates 2.7V ~ 3.7V; substitutes may operate at different voltage ranges)
• Package type (primary part is 24-DIP through-hole; substitutes include surface-mount alternatives)
• Mounting technology (surface-mount substitutes require PCB redesign considerations)
• Current consumption during timekeeping operation

The three substitute parts listed below maintain functional equivalence in core RTC and calendar operations while offering different packaging and voltage specifications suitable for various application requirements.

Parameter Comparison

Engineering Selection Recommendations

BQ4802LYDWR (Texas Instruments)

This substitute is recommended for applications requiring low-voltage operation (2.7V ~ 3.6V supply) with surface-mount packaging. The BQ4802LYDWR maintains functional parity with the DS17285-3+ in core RTC operations, including alarm, daylight savings, and leap year compensation. The device is active in production status with ROHS3 compliance. The 28-SOIC package requires PCB redesign from the original 24-DIP through-hole configuration. Current consumption during timekeeping is lower (1.5mA typical) compared to the DS17285-3+ specification.

DP8573AVX/NOPB (National Semiconductor)

This substitute operates at standard 5V logic levels (4.5V ~ 5.5V supply) and is suitable for applications where 5V systems are preferred. The device provides core RTC and calendar functionality with alarm and leap year features. The 28-LCC (J-Lead) surface-mount package differs from the original through-hole configuration. This part is active in production status. Operating temperature range extends to -40°C, providing broader environmental coverage than the DS17285-3+. RoHS compliance status is not specified in available documentation.

M48T201Y-70MH1F (STMicroelectronics)

This substitute is part of the Timekeeper® series and operates at 5V logic levels (4.5V ~ 5.5V supply). The device includes comprehensive features including alarm, leap year, square wave output, supervisor, watchdog timer, and Y2K compensation. The 44-BSOP package requires SNAPHAT and represents a larger footprint than the original 24-DIP. The device is active in production status with ROHS3 compliance. Operating temperature range matches the DS17285-3+ specification (0°C ~ 70°C). Moisture sensitivity level is MSL 3 (168 Hours), requiring controlled storage conditions.

All three substitutes maintain ROHS3 compliance and EAR99 classification consistent with the original DS17285-3+.

Frequently Asked Questions (FAQ)

Q: Can the BQ4802LYDWR directly replace the DS17285-3+ without PCB modifications?

A: No. The BQ4802LYDWR uses a 28-SOIC surface-mount package, while the DS17285-3+ is a 24-DIP through-hole device. PCB redesign is required to accommodate the different package footprint and mounting technology.

Q: What is the primary voltage difference between the DS17285-3+ and the DP8573AVX/NOPB?

A: The DS17285-3+ operates at 2.7V ~ 3.7V (low-voltage), while the DP8573AVX/NOPB requires 4.5V ~ 5.5V (standard 5V logic). System voltage architecture must be compatible with the selected substitute.

Q: Does the M48T201Y-70MH1F require special handling during assembly?

A: Yes. The M48T201Y-70MH1F has a moisture sensitivity level (MSL) of 3, requiring storage in controlled humidity conditions (168 hours maximum exposure at 60% relative humidity before reflow). The DS17285-3+ has MSL 1 (unlimited), requiring no special moisture control.

Q: Which substitute provides the lowest power consumption during timekeeping?

A: The DP8573AVX/NOPB specifies 1µA at 5V during timekeeping operation, significantly lower than the DS17285-3+ (2mA @ 2.7V ~ 3.7V). However, this comparison requires voltage normalization for accurate power budget analysis.

Q: Are all substitutes ROHS3 compliant?

A: The BQ4802LYDWR and M48T201Y-70MH1F are confirmed ROHS3 compliant. The DP8573AVX/NOPB RoHS compliance status is not specified in available documentation and should be verified with the manufacturer.

Q: What is the key functional difference between the DS17285-3+ and DP8573AVX/NOPB?

A: The DP8573AVX/NOPB provides only alarm and leap year features, while the DS17285-3+ includes additional daylight savings and square wave output capabilities. Feature set reduction may impact applications requiring daylight savings time compensation.

Q: Can the M48T201Y-70MH1F operate at the same voltage as the DS17285-3+?

A: No. The M48T201Y-70MH1F requires 4.5V ~ 5.5V supply voltage and cannot operate at the DS17285-3+ voltage range of 2.7V ~ 3.7V. System power architecture must be redesigned to accommodate this substitute.