DS17885E-5 Equivalent & Substitute Parts

Part Overview

The DS17885E-5 is a Real Time Clock (RTC) IC with Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This device provides 8KB of parallel interface memory with integrated alarm, daylight savings, leap year, NVSRAM, and square wave output capabilities. The part operates across 4.5V to 5.5V supply voltage with battery backup support from 2.5V to 3.7V.

The DS17885E-5 is classified as obsolete. Locating equivalent substitute parts is necessary to maintain system compatibility, ensure continued availability, and support legacy equipment maintenance and redesign initiatives.

Substiute Parts

DS17885E-5

Analog Devices Inc./Maxim IntegratedIn Stock: 908DS17885E-5 Datasheet

Current PartRFQ

BQ4802YPW

Texas InstrumentsIn Stock: 1928BQ4802YPW Datasheet

MFR RecommendedRFQ

DP8573AV/NOPB

Texas InstrumentsIn Stock: 4247DP8573AV/NOPB Datasheet

MFR RecommendedRFQ

M48T12-150PC1

STMicroelectronicsIn Stock: 2537M48T12-150PC1 Datasheet

MFR RecommendedRFQ

M48T18-100PC1

STMicroelectronicsIn Stock: 1462M48T18-100PC1 Datasheet

MFR RecommendedRFQ

M48T58-70PC1

STMicroelectronicsIn Stock: 1546M48T58-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS17885E-5 is determined by the following critical parameters:

• Interface type (Parallel)
• Time and date format compatibility (HH:MM:SS 12/24 hr; YY-MM-DD-dd)
• Supply voltage range (4.5V ~ 5.5V primary operation)
• Operating temperature range (0°C ~ 70°C minimum)
• Package compatibility (surface mount or through-hole with functional equivalence)
• Core RTC functionality (Clock/Calendar with alarm capability)

The substitute parts listed below meet these core electrical and functional requirements. Packaging differences (TSSOP vs. TSSOP vs. PLCC vs. DIP) represent valid substitutions when board layout and socket compatibility permit mechanical adaptation.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain functional equivalence to the DS17885E-5 across core RTC parameters: parallel interface, time/date format compatibility, and 4.5V to 5.5V supply voltage operation.

BQ4802YPW (Texas Instruments): Active product status with ROHS3 compliance and superior MSL rating (1, Unlimited). Maintains 28-TSSOP surface mount packaging with reduced timekeeping current (1.5mA typical). Battery voltage range extends to 4V, providing broader backup power compatibility.

DP8573AV/NOPB (Texas Instruments): Active product with ROHS3 compliance and extended operating temperature range (-40°C to 85°C). Offers lowest timekeeping current (1µA @ 5V) and widest battery voltage range (2.2V to 5.1V). Package differs as 28-LCC (J-Lead) surface mount, requiring board layout adaptation.

M48T12-150PC1 (STMicroelectronics): Active Timekeeper® series product with ROHS3 compliance and unlimited MSL rating. Through-hole 24-DIP package requires board redesign. Maintains 3mA timekeeping current specification matching the original part.

M48T18-100PC1 (STMicroelectronics): Active Timekeeper® series product with ROHS3 compliance and unlimited MSL rating. Through-hole 28-DIP package maintains pin count compatibility with the original part. Includes watchdog timer feature. Requires board redesign for through-hole mounting.

M48T58-70PC1 (STMicroelectronics): Active Timekeeper® series product with ROHS3 compliance and unlimited MSL rating. Through-hole 28-DIP package maintains pin count compatibility. Minimum supply voltage specified at 4.75V (0.25V higher than original part).

Frequently Asked Questions (FAQ)

Q: Can BQ4802YPW directly replace DS17885E-5 on the same PCB?

A: BQ4802YPW maintains identical 28-TSSOP surface mount packaging and electrical specifications. Direct socket substitution is feasible without board redesign. Verify pinout compatibility and firmware support for any feature differences (supervisor and watchdog timer functions).

Q: Why do the STMicroelectronics M48T series parts use through-hole DIP packaging instead of surface mount?

A: The M48T12, M48T18, and M48T58 are designed for through-hole mounting (24-DIP or 28-DIP modules). These represent functional equivalents but require PCB redesign and socket adaptation. They are suitable for legacy system maintenance where board rework is acceptable.

Q: What is the significance of the DP8573AV/NOPB operating temperature range of -40°C to 85°C?

A: The DP8573AV/NOPB supports extended temperature operation beyond the DS17885E-5 specification (0°C to 70°C). This part is suitable for applications requiring broader environmental tolerance. Verify that your application requires this extended range before selection.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original DS17885E-5 is RoHS non-compliant. If RoHS compliance is a design requirement, any substitute part satisfies this criterion.

Q: What does MSL rating mean for component selection?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions (30°C, 60% relative humidity) before soldering. MSL 1 (Unlimited) parts have no time restriction. MSL 3 (168 Hours) parts require controlled storage. All substitutes offer equal or superior MSL ratings compared to the original part.

Q: Can I use M48T18-100PC1 as a drop-in replacement for DS17885E-5?

A: M48T18-100PC1 provides functional equivalence in RTC operation and maintains 28-pin configuration. However, it requires through-hole mounting versus surface mount. This is not a drop-in replacement without PCB redesign. Pinout verification is mandatory before implementation.

Q: Which substitute offers the lowest power consumption?

A: DP8573AV/NOPB provides the lowest timekeeping current at 1µA @ 5V, compared to 3mA for the original part and 1.5mA typical for BQ4802YPW. Select DP8573AV/NOPB for battery-powered applications prioritizing extended runtime.