DS17285-5+ Equivalent & Substitute Parts

Part Overview

The DS17285-5+ is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Analog Devices Inc./Maxim Integrated. This 24-DIP through-hole component provides 2KB of parallel interface memory with integrated alarm, daylight savings, leap year, and NVSRAM capabilities. The product is currently obsolete, making equivalent substitute parts necessary for ongoing system maintenance, legacy system repairs, and design updates where modern alternatives are required.

Key Parameters

Parameter	DS17285-5+
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Clock/Timing
Type	Clock/Calendar
Package / Case	24-DIP (0.600", 15.24mm)
Mounting Type	Through Hole
Memory Size	2KB
Interface	Parallel
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Voltage - Supply	4.5V ~ 5.5V
Voltage - Supply, Battery	2.5V ~ 3.7V
Current - Timekeeping (Max)	3mA @ 4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Features	Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the DS17285-5+ is determined by the following critical parameters:

Primary Compatibility Criteria:

Clock/Calendar functionality with parallel interface
Time format support: HH:MM:SS (12/24 hr)
Date format support: YY-MM-DD-dd
Operating voltage range: 4.5V ~ 5.5V
Operating temperature range: 0°C ~ 70°C
RoHS3 compliance

Package Considerations: Substitutes are grouped into two categories based on mounting technology:

Through-hole 24-DIP packages (direct pin-compatible replacement)
Surface-mount alternatives (28-SOIC, 28-SOP) requiring PCB redesign

Active vs. Obsolete Status: The DS17285-5+ is obsolete. Active substitute parts ensure long-term availability and supply chain reliability for new designs and legacy system support.

Parameter Comparison

Parameter	DS17285-5+	M48T02-150PC1	M48T35Y-70MH1F	BQ4802YDW
Manufacturer	Analog Devices Inc./Maxim Integrated	STMicroelectronics	STMicroelectronics	Benchmarq
Product Status	Obsolete	Active	Active	Active
Type	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar
Package / Case	24-DIP (0.600", 15.24mm)	24-DIP Module (0.600", 15.24mm)	28-SOP (0.350", 8.89mm Width)	28-SOIC (0.295", 7.50mm Width)
Mounting Type	Through Hole	Through Hole	Surface Mount	Surface Mount
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 (12/24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
Voltage - Supply	4.5V ~ 5.5V	4.75V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Timekeeping (Max)	3mA @ 4.5V ~ 5.5V	3mA @ 4.7V ~ 5.5V	2mA @ 4.75V ~ 5.5V	1.5mA (Typ) @ 4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

M48T02-150PC1 (STMicroelectronics) Direct through-hole 24-DIP substitute with identical package footprint. Active product status ensures supply chain continuity. ROHS3 compliant. Timekeeper® series provides proven reliability. Suitable for direct PCB replacement without layout modifications. Voltage supply range 4.75V ~ 5.5V requires verification against system minimum voltage specifications.

M48T35Y-70MH1F (STMicroelectronics) Active surface-mount alternative in 28-SOP package. Timekeeper® series with ROHS3 compliance. Lower timekeeping current (2mA) compared to DS17285-5+ (3mA) provides power efficiency benefits. Requires PCB redesign for package transition. Moisture sensitivity level MSL-3 (168 hours) requires controlled storage conditions.

BQ4802YDW (Benchmarq) Active surface-mount option in 28-SOIC package. Lowest timekeeping current consumption (1.5mA typical) among substitutes. Includes supervisor and watchdog timer features. Requires PCB redesign. RoHS status not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can M48T02-150PC1 replace DS17285-5+ without PCB modifications? A: Yes. M48T02-150PC1 maintains the 24-DIP through-hole package format with identical 0.600" (15.24mm) spacing, enabling direct pin-compatible replacement. Verify system voltage requirements fall within 4.75V ~ 5.5V range.

Q: What is the primary difference between through-hole and surface-mount substitutes? A: Through-hole substitutes (M48T02-150PC1) require no PCB layout changes. Surface-mount substitutes (M48T35Y-70MH1F, BQ4802YDW) require PCB redesign but offer reduced power consumption and smaller footprints.

Q: Are all substitutes RoHS3 compliant? A: M48T02-150PC1 and M48T35Y-70MH1F are ROHS3 compliant. BQ4802YDW RoHS status is not specified in available documentation and should be verified with the manufacturer.

Q: How do timekeeping current specifications compare? A: DS17285-5+ draws 3mA at 4.5V ~ 5.5V. M48T02-150PC1 draws 3mA at 4.7V ~ 5.5V. M48T35Y-70MH1F draws 2mA at 4.75V ~ 5.5V. BQ4802YDW draws 1.5mA typical at 4.5V ~ 5.5V. Lower current consumption reduces power budget requirements.

Q: What does MSL-3 (168 hours) mean for M48T35Y-70MH1F? A: Moisture Sensitivity Level 3 requires the component to be used within 168 hours of package opening under controlled humidity conditions. Extended storage requires dry-pack conditions or desiccant storage.

Q: Do all substitutes support 12/24-hour time format? A: DS17285-5+ and BQ4802YDW support both 12/24-hour formats. M48T02-150PC1 and M48T35Y-70MH1F support 24-hour format only. Verify system firmware compatibility with 24-hour format requirement.

Q: What is the minimum supply voltage for each substitute? A: DS17285-5+ minimum is 4.5V. M48T02-150PC1 minimum is 4.75V. M48T35Y-70MH1F minimum is 4.5V. BQ4802YDW minimum is 4.5V. Confirm system power supply specifications meet these minimums.

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