DS1284+ Equivalent & Substitute Parts

Part Overview

The DS1284+ is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality manufactured by Analog Devices Inc./Maxim Integrated. This device provides 50 bytes of SRAM, parallel interface connectivity, and comprehensive timekeeping features including alarm, leap year compensation, square wave output, and watchdog timer capabilities. The DS1284+ is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing system support. Substitutes must maintain functional compatibility across timekeeping interface, voltage supply ranges, and package mounting requirements.

Key Parameters

Parameter	DS1284+
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Clock/Timing
Type	Clock/Calendar
Interface	Parallel
Package / Case	28-DIP (0.600", 15.24mm)
Mounting Type	Through Hole
Voltage - Supply	4.5V ~ 5.5V
Voltage - Supply, Battery	2.4V ~ 4.6V
Current - Timekeeping (Max)	7mA @ 5V
Operating Temperature	0°C ~ 70°C
Memory Size	50B
Time Format	HH:MM:SS:hh (12/24 hr)
Date Format	YY-MM-DD-dd
Features	Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the DS1284+ is determined by the following critical parameters:

Primary Compatibility Criteria:

Parallel interface architecture
28-pin DIP package configuration (0.600", 15.24mm)
Through-hole mounting type
Supply voltage range: 4.5V ~ 5.5V
Operating temperature range: 0°C ~ 70°C
Clock/Calendar functionality with date and time tracking
Leap year compensation feature

Substitute Classification:

M48T35Y-70PC1 qualifies as a direct substitute. This part maintains identical package geometry (28-DIP Module, 0.600", 15.24mm), through-hole mounting, parallel interface, and supply voltage specifications (4.5V ~ 5.5V). Operating temperature range matches (0°C ~ 70°C). Both devices support leap year functionality and parallel clock/calendar operation. The M48T35Y-70PC1 is active product status with ROHS3 compliance.

M48T02-70PC1 provides functional substitution with package variation. This part operates within compatible voltage ranges (4.75V ~ 5.5V) and maintains parallel interface and through-hole mounting. Package configuration differs as 24-DIP Module rather than 28-DIP, requiring PCB layout modification. Leap year support is present. Active product status with ROHS3 compliance.

M48T08Y-10MH1F offers functional substitution with mounting type variation. This part maintains parallel interface, compatible voltage range (4.5V ~ 5.5V), and operating temperature (0°C ~ 70°C). Package configuration is 28-SOP surface mount rather than through-hole DIP, requiring board redesign. Leap year and watchdog timer features are supported. Active product status with ROHS3 compliance.

Parameter Comparison

Parameter	DS1284+	M48T35Y-70PC1	M48T02-70PC1	M48T08Y-10MH1F
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
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.75V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Current - Timekeeping (Max)	7mA @ 5V	2mA @ 4.75V ~ 5.5V	3mA @ 4.7V ~ 5.5V	3mA @ 4.5V ~ 5.5V
Time Format	HH:MM:SS:hh (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
Leap Year	Yes	Yes	Yes	Yes
Mounting Type	Through Hole	Through Hole	Through Hole	Surface Mount
Package / Case	28-DIP (0.600", 15.24mm)	28-DIP Module (0.600", 15.24mm)	24-DIP Module (0.600", 15.24mm)	28-SOP (0.350", 8.89mm Width)
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

M48T35Y-70PC1 (Recommended Primary Substitute)

The M48T35Y-70PC1 is the optimal substitute for direct replacement applications. This part maintains identical package geometry, mounting type, and electrical interface specifications as the DS1284+. Both devices operate within 4.5V ~ 5.5V supply range and 0°C ~ 70°C temperature specifications. The M48T35Y-70PC1 is active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. Current consumption is reduced to 2mA at nominal supply voltage, providing improved power efficiency. No PCB layout modifications are required for this substitution.

M48T02-70PC1 (Secondary Substitute - Package Variation)

The M48T02-70PC1 provides functional substitution when package footprint modification is acceptable. This part operates within compatible voltage and temperature ranges with parallel interface architecture. The 24-DIP package configuration requires PCB redesign and socket modification. Active product status and ROHS3 compliance are maintained. This option is suitable for new design implementations where board layout flexibility exists.

M48T08Y-10MH1F (Tertiary Substitute - Mounting Type Variation)

The M48T08Y-10MH1F is applicable for surface-mount design implementations. This part maintains parallel interface and compatible electrical specifications (4.5V ~ 5.5V, 0°C ~ 70°C). The 28-SOP package requires complete PCB redesign and assembly process modification from through-hole to surface-mount technology. Moisture sensitivity level is MSL 3 (168 hours) compared to MSL 1 for the primary substitute. Active product status and ROHS3 compliance are present. This option is suitable for new designs utilizing surface-mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can M48T35Y-70PC1 be used as a direct replacement for DS1284+ without PCB modifications?

A: Yes. The M48T35Y-70PC1 maintains identical 28-DIP package geometry (0.600", 15.24mm), through-hole mounting type, and parallel interface configuration. No PCB layout changes are required. Electrical specifications (4.5V ~ 5.5V supply, 0°C ~ 70°C operation) are compatible.

Q: What is the primary difference between M48T35Y-70PC1 and M48T02-70PC1?

A: Package configuration differs. M48T35Y-70PC1 is 28-DIP Module, maintaining the original DS1284+ footprint. M48T02-70PC1 is 24-DIP Module, requiring PCB socket and layout modification. Both maintain parallel interface and compatible voltage specifications.

Q: Why is M48T08Y-10MH1F classified as a tertiary substitute?

A: This part requires mounting type conversion from through-hole to surface-mount (28-SOP package). Complete PCB redesign and assembly process modification are necessary. Moisture sensitivity level is higher (MSL 3 versus MSL 1). Electrical and functional specifications remain compatible.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. DS1284+, M48T35Y-70PC1, M48T02-70PC1, and M48T08Y-10MH1F are all ROHS3 compliant. All parts are REACH unaffected and classified under ECCN EAR99.

Q: What is the current consumption difference between DS1284+ and substitute parts?

A: DS1284+ draws 7mA at 5V during timekeeping. M48T35Y-70PC1 draws 2mA at 4.75V ~ 5.5V. M48T02-70PC1 draws 3mA at 4.7V ~ 5.5V. M48T08Y-10MH1F draws 3mA at 4.5V ~ 5.5V. All substitutes provide reduced power consumption.

Q: Can the DS1284+ 12/24-hour time format be replicated with 24-hour only substitutes?

A: The substitute parts (M48T35Y-70PC1, M48T02-70PC1, M48T08Y-10MH1F) support 24-hour time format only. Applications requiring 12-hour format operation must implement software conversion logic or select alternative components.

Q: What is the inventory status of substitute parts?

A: M48T35Y-70PC1: 3075 pcs. M48T02-70PC1: 1235 pcs. M48T08Y-10MH1F: 1110 pcs. All are new original stock with active product status.

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