DS17285E-3 Equivalent & Substitute Parts

Part Overview

The DS17285E-3 is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Analog Devices Inc./Maxim Integrated. This component integrates a 2KB parallel interface RTC with alarm, daylight savings, leap year, and NVSRAM capabilities in a 28-TSSOP surface mount package. The product is currently obsolete, making equivalent substitute parts necessary for legacy system maintenance, redesigns, or component sourcing when original inventory becomes unavailable.

Key Parameters

Parameter	DS17285E-3 Specification
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Clock/Timing
Type	Clock/Calendar
Interface	Parallel
Memory Size	2KB
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Voltage - Supply	2.7V ~ 3.7V
Voltage - Supply, Battery	2.5V ~ 3.7V
Current - Timekeeping (Max)	2mA @ 2.7V ~ 3.7V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	28-TSSOP (0.465", 11.80mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the DS17285E-3 is determined by the following critical parameters:

Interface Compatibility: The DS17285E-3 uses a parallel interface. All substitute parts must maintain parallel interface architecture to ensure direct functional replacement without firmware or protocol modifications.

Voltage Supply Range: The main part operates at 2.7V ~ 3.7V with battery backup at 2.5V ~ 3.7V. Substitute parts must support compatible voltage ranges to function within the same power distribution system.

Time and Date Format: The DS17285E-3 supports HH:MM:SS (12/24 hr) time format and YY-MM-DD-dd date format. Substitute parts must provide equivalent or superior time/date tracking capabilities.

Operating Temperature Range: The 0°C ~ 70°C operating range defines the thermal environment. Substitute parts must maintain this specification or exceed it.

Package and Mounting: The 28-TSSOP surface mount package is specific to the original design. Substitute parts may differ in package type (DIP vs. TSSOP) if the application allows PCB redesign or adapter solutions.

Product Status and Compliance: Active product status and RoHS compliance are preferred for new designs and long-term availability. Obsolete status indicates end-of-life components.

The three substitute parts listed (M48T02-150PC1, M48T12-150PC1, M48T58-70PC1) are STMicroelectronics Timekeeper® series RTC ICs with parallel interface, clock/calendar functionality, and active product status. These parts share core RTC functionality but operate at higher voltage ranges (4.5V ~ 5.5V) and use through-hole DIP packaging rather than surface mount TSSOP.

Parameter Comparison

Parameter	DS17285E-3	M48T02-150PC1	M48T12-150PC1	M48T58-70PC1
Manufacturer	Analog Devices Inc./Maxim Integrated	STMicroelectronics	STMicroelectronics	STMicroelectronics
Category	Clock/Timing	Clock/Timing	Clock/Timing	Clock/Timing
Type	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar
Interface	Parallel	Parallel	Parallel	Parallel
Time Format	HH:MM:SS (12/24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
Voltage - Supply	2.7V ~ 3.7V	4.75V ~ 5.5V	4.5V ~ 5.5V	4.75V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Through Hole	Through Hole	Through Hole
Package / Case	28-TSSOP (0.465", 11.80mm Width)	24-DIP Module (0.600", 15.24mm)	24-DIP Module (0.600", 15.24mm)	28-DIP Module (0.600", 15.24mm)
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Current - Timekeeping (Max)	2mA @ 2.7V ~ 3.7V	3mA @ 4.7V ~ 5.5V	3mA @ 4.5V ~ 5.5V	3mA @ 4.75V ~ 5.5V

Engineering Selection Recommendations

For Direct Functional Replacement:

The DS17285E-3 is obsolete with RoHS non-compliant status. The three STMicroelectronics Timekeeper® substitutes (M48T02-150PC1, M48T12-150PC1, M48T58-70PC1) are active products with ROHS3 compliance, ensuring long-term availability and regulatory compliance for new designs or legacy system updates.

Voltage Supply Consideration:

The DS17285E-3 operates at 2.7V ~ 3.7V, while all three substitute parts require 4.5V ~ 5.5V supply voltage. System redesign is necessary to accommodate the higher voltage requirement. This is a critical design parameter that cannot be overlooked during substitution planning.

Package and Mounting Transition:

The original DS17285E-3 uses 28-TSSOP surface mount packaging. All substitute parts use through-hole DIP packaging (24-DIP or 28-DIP modules). PCB redesign is required for mechanical and electrical integration. The M48T58-70PC1 maintains the 28-pin count, matching the original pin configuration more closely than the 24-pin alternatives.

Time Format Compatibility:

The DS17285E-3 supports both 12-hour and 24-hour time formats. The substitute parts operate exclusively in 24-hour format. Firmware or software modifications may be necessary if the original system relies on 12-hour format functionality.

Moisture Sensitivity and Storage:

The DS17285E-3 has MSL rating 3 (168 hours), indicating higher moisture sensitivity. All substitute parts have MSL rating 1 (unlimited), providing superior moisture resistance and extended shelf life.

Frequently Asked Questions (FAQ)

Q: Can the M48T02-150PC1, M48T12-150PC1, or M48T58-70PC1 directly replace the DS17285E-3 without circuit modifications?

A: Direct pin-for-pin replacement is not possible due to package type differences (28-TSSOP surface mount vs. 24/28-DIP through-hole) and voltage supply requirements (2.7V ~ 3.7V vs. 4.5V ~ 5.5V). PCB redesign and power supply modifications are required.

Q: What is the primary difference between the three substitute parts?

A: M48T02-150PC1 and M48T12-150PC1 are 24-pin DIP packages, while M48T58-70PC1 is a 28-pin DIP package. The 28-pin M48T58-70PC1 more closely matches the original DS17285E-3 pin count. All three maintain parallel interface, clock/calendar functionality, and active product status.

Q: Does the voltage supply difference affect functionality?

A: The substitute parts require higher supply voltage (4.5V ~ 5.5V minimum) compared to the DS17285E-3 (2.7V ~ 3.7V). The system power distribution must be redesigned to accommodate this requirement. The RTC functionality remains equivalent at the higher voltage.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three substitute parts (M48T02-150PC1, M48T12-150PC1, M48T58-70PC1) are ROHS3 compliant, whereas the DS17285E-3 is RoHS non-compliant. This compliance status is advantageous for new designs and regulatory requirements.

Q: What is the impact of the time format difference (12/24 hr vs. 24 hr only)?

A: The DS17285E-3 supports both 12-hour and 24-hour time formats. The substitute parts operate exclusively in 24-hour format. If the original system firmware or software depends on 12-hour format output, modifications to the application code are necessary.

Q: Which substitute part should be selected for a legacy system redesign?

A: The M48T58-70PC1 is recommended for designs requiring the closest pin-count match to the original DS17285E-3 (28 pins). The 24-pin alternatives (M48T02-150PC1, M48T12-150PC1) are suitable if pin count flexibility exists in the redesign.

Q: What is the current consumption difference between the main part and substitutes?

A: The DS17285E-3 draws 2mA maximum during timekeeping at 2.7V ~ 3.7V. The substitute parts draw 3mA maximum at their respective voltage ranges (4.5V ~ 5.5V). Power consumption increases due to higher operating voltage.

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