DS14285N Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The DS14285N 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 114B of NVSRAM, alarm capability, daylight savings support, and leap year compensation. The DS14285N is classified as obsolete, making identification of functionally equivalent substitute components essential for ongoing system support and new design implementations.

Substiute Parts

DS14285N

Analog Devices Inc./Maxim IntegratedIn Stock: 1081DS14285N Datasheet

Current PartRFQ

DS1685EN-5+

Analog Devices Inc./Maxim IntegratedIn Stock: 5272DS1685EN-5+ Datasheet

MFR RecommendedRFQ

BQ4802YPW

Texas InstrumentsIn Stock: 1928BQ4802YPW Datasheet

MFR RecommendedRFQ

DP8573AV/NOPB

Texas InstrumentsIn Stock: 4247DP8573AV/NOPB Datasheet

MFR RecommendedRFQ

M48T08-100PC1

STMicroelectronicsIn Stock: 1683M48T08-100PC1 Datasheet

MFR RecommendedRFQ

M48T08Y-10MH1F

STMicroelectronicsIn Stock: 1165M48T08Y-10MH1F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS14285N is determined by the following critical parameters:

• Parallel interface architecture
• Supply voltage range compatibility (4.5V ~ 5.5V primary, 2.5V ~ 3.6V battery backup minimum)
• Time and date format support (HH:MM:SS and YY-MM-DD-dd)
• Operating temperature range (-40°C ~ 85°C)
• Alarm and calendar functionality
• NVSRAM or equivalent non-volatile storage

Substitute parts are grouped by mounting technology: Surface Mount (TSSOP, SOP, PLCC) and Through Hole (DIP) variants. Each substitute maintains core RTC functionality with parallel interface operation. Package differences require PCB layout modification but do not affect functional compatibility when electrical parameters align.

Parameter Comparison

Engineering Selection Recommendations

DS1685EN-5+ (Analog Devices Inc./Maxim Integrated) Active product status with ROHS3 compliance. Maintains Analog Devices manufacturing lineage with DS14285N. Surface mount 24-TSSOP package requires PCB redesign. Supports 12/24-hour format and YY-MM-DD-dd date structure. Expanded memory (242B vs. 114B) and Y2K support. Operating temperature range matches original (-40°C ~ 85°C). Battery voltage range extends to 3.7V.

BQ4802YPW (Texas Instruments) Active product with ROHS3 compliance. 28-TSSOP surface mount package. Includes supervisor and watchdog timer functions. Operating temperature limited to 0°C ~ 70°C (narrower than DS14285N). Supports daylight savings and leap year. Battery voltage range 2.4V ~ 4.0V. Pin count increase (28 vs. 24) requires firmware and layout modification.

DP8573AV/NOPB (Texas Instruments) Active product with ROHS3 compliance. 28-LCC J-Lead surface mount package. Lowest timekeeping current (1µA @ 5V). Widest battery voltage range (2.2V ~ 5.1V). Operating temperature matches original (-40°C ~ 85°C). MSL rating 2A requires controlled storage. Pin count and package differ significantly from DS14285N.

M48T08-100PC1 (STMicroelectronics) Active product with ROHS3 compliance. Through-hole 28-DIP module package maintains mounting compatibility with through-hole design approach. Timekeeper® series designation. Operating temperature limited to 0°C ~ 70°C. 24-hour time format only (no 12-hour option). Watchdog timer included. Minimum supply voltage 4.75V (higher than DS14285N).

M48T08Y-10MH1F (STMicroelectronics) Active product with ROHS3 compliance. Surface mount 28-SOP package with SNAPHAT sockets. Timekeeper® series. 24-hour time format only. Operating temperature 0°C ~ 70°C. MSL rating 3 (168 hours) requires moisture control during storage and assembly. Cut tape packaging.

Frequently Asked Questions (FAQ)

Q: Can DS1685EN-5+ directly replace DS14285N in existing designs? A: Electrical parameters align (4.5V ~ 5.5V supply, -40°C ~ 85°C operation, parallel interface, 12/24-hour format). However, package differs (24-TSSOP surface mount vs. 24-DIP through hole), requiring PCB layout modification. Pin mapping must be verified against datasheets.

Q: Why do some substitutes have narrower operating temperature ranges? A: BQ4802YPW and M48T08 variants specify 0°C ~ 70°C operation, compared to DS14285N's -40°C ~ 85°C. Applications requiring extended temperature operation must select DP8573AV/NOPB or DS1685EN-5+.

Q: What is the significance of RoHS compliance differences? A: DS14285N is RoHS non-compliant (lead-containing solder). All active substitutes are ROHS3 compliant, meeting current environmental regulations. New designs should specify ROHS3-compliant alternatives.

Q: Do all substitutes support 12-hour time format? A: DS1685EN-5+, BQ4802YPW, and DP8573AV/NOPB support 12/24-hour formats. M48T08-100PC1 and M48T08Y-10MH1F support 24-hour format only. Application firmware must accommodate format differences.

Q: Which substitute offers the lowest power consumption? A: DP8573AV/NOPB specifies 1µA timekeeping current @ 5V, the lowest among all substitutes. DS14285N specifies 0.5µA @ 4.5V ~ 5.5V. Battery-backed applications should evaluate actual operating conditions.

Q: Are pin-for-pin replacements available? A: No. DS14285N uses 24-DIP package. DS1685EN-5+ matches pin count (24) but uses TSSOP surface mount. M48T08 variants use 28-pin packages. All substitutions require schematic and layout review.

Q: What packaging considerations apply to M48T08Y-10MH1F? A: MSL rating 3 (168 hours) requires moisture-controlled storage and assembly environment. Cut tape packaging differs from tube packaging of other substitutes. Reflow soldering parameters must follow STMicroelectronics guidelines.