DS14285SN Real Time Clock IC - Equivalent & Substitute Parts

Part Overview

The DS14285SN is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality manufactured by Analog Devices Inc./Maxim Integrated. This device features 114B of NVSRAM, parallel interface, and comprehensive timekeeping capabilities including alarm, daylight savings, and leap year support. The DS14285SN is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	DS14285SN
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Clock/Timing
Type	Clock/Calendar
Package / Case	24-SOIC (0.295", 7.50mm Width)
Memory Size	114B
Interface	Parallel
Voltage - Supply	4.5V ~ 5.5V
Voltage - Supply, Battery	2.5V ~ 3.6V
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the DS14285SN is determined by compatibility across the following critical parameters:

Primary Compatibility Criteria:

Interface type (Parallel)
Package form factor (24-SOIC or compatible)
Supply voltage range (4.5V ~ 5.5V primary, with battery backup capability)
Time and date format support (HH:MM:SS and YY-MM-DD-dd)
Operating temperature range (-40°C ~ 85°C)

Identified Substitute Parts:

DS1685SN-5+ (Analog Devices Inc./Maxim Integrated) - Primary manufacturer recommended substitute. Maintains identical package (24-SOIC), parallel interface, and voltage specifications. Offers expanded memory (242B), active product status, and RoHS3 compliance.
M48T35AV-10MH1F (STMicroelectronics) - Alternative substitute with different package form (28-SOP with SNAPHAT Sockets). Maintains parallel interface and clock/calendar functionality. Operates at reduced supply voltage (3V ~ 3.6V) and narrower temperature range (0°C ~ 70°C).

Parameter Comparison

Parameter	DS14285SN (Main)	DS1685SN-5+ (Substitute)	M48T35AV-10MH1F (Substitute)
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	STMicroelectronics
Package / Case	24-SOIC (0.295", 7.50mm Width)	24-SOIC (0.295", 7.50mm Width)	28-SOP (0.350", 8.89mm Width) with SNAPHAT Sockets
Type	Clock/Calendar	Clock/Calendar	Clock/Calendar
Interface	Parallel	Parallel	Parallel
Memory Size	114B	242B	-
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	3V ~ 3.6V
Voltage - Supply, Battery	2.5V ~ 3.6V	2.5V ~ 3.7V	-
Time Format	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C
Current - Timekeeping (Max)	0.5µA @ 4.5V ~ 5.5V	3mA @ 5V	2mA @ 3V ~ 3.6V
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Mounting Type	Surface Mount	Surface Mount	Surface Mount

Engineering Selection Recommendations

DS1685SN-5+ Selection Criteria:

Identical 24-SOIC package enables direct PCB layout compatibility
Matching supply voltage range (4.5V ~ 5.5V) and battery backup voltage (2.5V ~ 3.7V) ensures circuit compatibility
Identical operating temperature range (-40°C ~ 85°C) maintains thermal performance specifications
Active product status provides long-term availability and supply chain stability
RoHS3 compliance satisfies modern regulatory requirements
Expanded memory (242B vs. 114B) provides additional functionality without compromising compatibility
Manufacturer-recommended substitute designation

M48T35AV-10MH1F Selection Criteria:

Parallel interface maintains software compatibility
Active product status and RoHS3 compliance support regulatory compliance
Reduced supply voltage range (3V ~ 3.6V) requires circuit redesign for primary supply
Different package form (28-SOP vs. 24-SOIC) necessitates PCB layout modification
Narrower operating temperature range (0°C ~ 70°C) may not satisfy extended temperature applications
Suitable for new designs with voltage and temperature constraints

Frequently Asked Questions (FAQ)

Q: Can DS1685SN-5+ directly replace DS14285SN without PCB modifications? A: Yes. Both devices use identical 24-SOIC packaging and matching supply voltage specifications (4.5V ~ 5.5V). Pin-to-pin compatibility and software interface alignment enable direct substitution without PCB layout changes.

Q: What are the key differences between DS1685SN-5+ and M48T35AV-10MH1F? A: DS1685SN-5+ maintains the original 24-SOIC package and 4.5V ~ 5.5V supply voltage, requiring no circuit modifications. M48T35AV-10MH1F uses a different 28-SOP package and operates at reduced voltage (3V ~ 3.6V), requiring PCB redesign and circuit modifications. M48T35AV-10MH1F also has a narrower operating temperature range (0°C ~ 70°C).

Q: Is the DS14285SN still available for purchase? A: The DS14285SN is classified as obsolete. Substitute parts DS1685SN-5+ and M48T35AV-10MH1F are both active products with current inventory availability.

Q: Does the increased memory in DS1685SN-5+ (242B vs. 114B) affect compatibility? A: No. The expanded memory is a functional enhancement that does not compromise backward compatibility. Existing firmware and software designed for DS14285SN will operate on DS1685SN-5+ without modification.

Q: What compliance certifications apply to substitute parts? A: DS1685SN-5+ and M48T35AV-10MH1F both hold RoHS3 compliance certification. The original DS14285SN is RoHS non-compliant. Both substitutes are REACH Unaffected and classified as EAR99 for export control purposes.

Q: Can M48T35AV-10MH1F be used in applications requiring -40°C operation? A: No. M48T35AV-10MH1F operates within 0°C ~ 70°C range and is unsuitable for extended low-temperature applications. DS1685SN-5+ maintains the original -40°C ~ 85°C operating range.

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