DS14285+ Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The DS14285+ is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This device provides 114 bytes of NVSRAM with parallel interface in a 24-DIP package. The DS14285+ is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across timing, interface, and electrical specifications while accommodating modern packaging and active product status where applicable.

Substiute Parts

DS14285+

Analog Devices Inc./Maxim IntegratedIn Stock: 740DS14285+ Datasheet

Current PartRFQ

DS12885+

Analog Devices Inc./Maxim IntegratedIn Stock: 2073DS12885+ Datasheet

MFR RecommendedRFQ

DS1685-5+

Analog Devices Inc./Maxim IntegratedIn Stock: 1293DS1685-5+ Datasheet

MFR RecommendedRFQ

BQ3285S-SB2

Texas InstrumentsIn Stock: 1987BQ3285S-SB2 Datasheet

MFR RecommendedRFQ

BQ4802YDWR

Texas InstrumentsIn Stock: 1873BQ4802YDWR Datasheet

MFR RecommendedRFQ

M48T37Y-70MH1F

STMicroelectronicsIn Stock: 2256M48T37Y-70MH1F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the DS14285+ is based on the following critical parameters:

Primary Compatibility Criteria:

• Parallel interface requirement
• Time format support (HH:MM:SS with 12/24 hour capability)
• Date format support (YY-MM-DD-dd)
• Operating temperature range (0°C ~ 70°C)
• Supply voltage range (4.5V ~ 5.5V)
• NVSRAM functionality with minimum 114 bytes
• RoHS3 compliance

Substitution Categories:

Category 1: Direct DIP Package Equivalents — DS12885+ and DS1685-5+ maintain the 24-DIP through-hole package, enabling direct socket replacement in legacy designs. Both are active products from Analog Devices Inc./Maxim Integrated with identical package dimensions and parallel interface.

Category 2: Surface Mount Equivalents (SOIC) — BQ3285S-SB2 provides equivalent functionality in 24-SOIC surface mount package. This substitution requires PCB redesign but maintains 114-byte memory and identical feature set.

Category 3: Enhanced Feature Variants — BQ4802YDWR (28-SOIC) and M48T37Y-70MH1F (44-BSOP) offer extended functionality including supervisor and watchdog timer capabilities, with surface mount packaging. These require board-level redesign but provide additional system protection features.

Parameter Comparison

Engineering Selection Recommendations

For Direct Socket Replacement (Through-Hole Applications):

DS12885+ is the primary recommendation for legacy board retrofits. This part maintains identical 24-DIP package geometry, active product status, and ROHS3 compliance. The DS12885+ is manufactured by Analog Devices Inc./Maxim Integrated, ensuring design continuity with the original DS14285+.

DS1685-5+ provides an alternative with expanded memory (242B versus 114B) and active product status. This substitution is suitable when additional NVSRAM capacity benefits system design without requiring board modifications.

For New Designs with Surface Mount Packaging:

BQ3285S-SB2 (Texas Instruments, 24-SOIC) maintains functional equivalence with identical feature set and 114-byte memory. This option requires PCB redesign but enables modern surface mount assembly processes.

BQ4802YDWR (Texas Instruments, 28-SOIC) adds supervisor and watchdog timer functionality while maintaining core RTC/calendar performance. This variant is suitable for applications requiring enhanced system monitoring capabilities.

M48T37Y-70MH1F (STMicroelectronics, 44-BSOP) offers the most comprehensive feature set with watchdog timer and alarm functionality. This part requires the most significant board redesign but provides maximum system integration. Note: MSL rating of 3 requires controlled moisture handling during assembly.

All substitute parts maintain ROHS3 compliance and operating temperature range compatibility with the original DS14285+.

Frequently Asked Questions (FAQ)

Q: Can DS12885+ directly replace DS14285+ in existing designs?

A: Yes. DS12885+ maintains identical 24-DIP package dimensions, parallel interface, and core RTC/calendar functionality. No board modifications are required for socket replacement. Both parts support 12/24-hour time format and YY-MM-DD-dd date format.

Q: What is the primary difference between DS12885+ and DS1685-5+?

A: Memory capacity differs. DS12885+ provides 114 bytes of NVSRAM, matching the original DS14285+. DS1685-5+ provides 242 bytes, offering expanded storage for additional application data. Both maintain identical package, interface, and operating specifications.

Q: Why would I select a surface mount substitute like BQ3285S-SB2?

A: Surface mount packages reduce PCB footprint and enable automated assembly processes. BQ3285S-SB2 maintains 114-byte memory and identical feature set (Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output) but requires PCB redesign from through-hole to SOIC layout.

Q: What additional features does BQ4802YDWR provide?

A: BQ4802YDWR includes supervisor and watchdog timer functionality beyond standard RTC/calendar operation. These features provide system reset and monitoring capabilities. The 28-SOIC package accommodates additional pins for these functions.

Q: Is M48T37Y-70MH1F compatible with standard RTC applications?

A: M48T37Y-70MH1F provides RTC/calendar functionality with alarm and watchdog timer features. However, this part operates in 24-hour time format only (not 12/24 selectable) and requires SNAPHAT socket accommodation due to 44-BSOP package. MSL rating of 3 requires moisture-controlled handling during assembly.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original DS14285+ regulatory requirements. All parts carry EAR99 ECCN classification and HTSUS code 8542.39.0001.

Q: Can I use these substitutes interchangeably in production?

A: Direct interchangeability applies only to DS12885+ and DS1685-5+ in through-hole applications. Surface mount substitutes (BQ3285S-SB2, BQ4802YDWR, M48T37Y-70MH1F) require PCB redesign and cannot be used as drop-in replacements. Firmware compatibility must be verified for each substitution.