DS1286+ Equivalent & Substitute Parts

Part Overview

The DS1286+ is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality manufactured by Analog Devices Inc./Maxim Integrated. This 28-DIP parallel interface module provides 50 bytes of SRAM, alarm capability, leap year support, square wave output, and watchdog timer functionality. The device operates with a primary supply voltage of 4.5V to 5.5V and maintains timekeeping at 2.4V to 4.6V battery backup.

The DS1286+ is classified as obsolete. Locating equivalent substitute parts is necessary to support legacy system maintenance, board redesigns, and production continuity where original components are no longer readily available or have reached end-of-life status.

Key Parameters

Parameter	DS1286+ Specification
Manufacturer	Analog Devices Inc./Maxim Integrated
Product Category	Clock/Timing - RTC Clock/Calendar
Package Type	28-DIP Module (0.61", 15.49mm), 23 Leads
Interface	Parallel
Memory Size	50 Bytes
Time Format	HH:MM:SS:hh (12/24 hr)
Date Format	YY-MM-DD-dd
Supply Voltage	4.5V ~ 5.5V
Battery Voltage	2.4V ~ 4.6V
Timekeeping Current (Max)	7mA @ 5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DS1286+ is determined by the following critical parameters:

Primary Substitution Criteria:

Package type: 28-DIP Module with Through Hole mounting
Interface: Parallel
Operating temperature range: 0°C ~ 70°C
Supply voltage compatibility: 4.5V ~ 5.5V nominal operation
RTC functionality: Clock/Calendar with date and time tracking
RoHS3 compliance and MSL rating

Substitution Logic: The M48T35-70PC1 qualifies as a direct substitute based on matching package geometry (28-DIP Module), parallel interface architecture, identical operating temperature range, overlapping supply voltage specification (4.75V ~ 5.5V), and equivalent RoHS3/MSL compliance. Both devices function as RTC Clock/Calendar ICs with parallel data access, enabling pin-compatible or near pin-compatible board integration.

Differences in memory size, timekeeping current draw, and time format options do not preclude substitution when the application requirements fall within the M48T35-70PC1 specification envelope.

Parameter Comparison

Parameter	DS1286+	M48T35-70PC1
Manufacturer	Analog Devices Inc./Maxim Integrated	STMicroelectronics
Product Category	Clock/Timing - RTC Clock/Calendar	Clock/Timing - RTC Clock/Calendar
Package Type	28-DIP Module (0.61", 15.49mm), 23 Leads	28-DIP Module (0.600", 15.24mm)
Interface	Parallel	Parallel
Time Format	HH:MM:SS:hh (12/24 hr)	HH:MM:SS (24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd
Supply Voltage	4.5V ~ 5.5V	4.75V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Active Production and New Designs: The M48T35-70PC1 is classified as Active product status and is recommended for new designs and ongoing production support. This device maintains ROHS3 compliance and MSL-1 rating, ensuring regulatory alignment and supply chain stability.

For Legacy System Maintenance: The DS1286+ remains suitable for repair and maintenance of existing systems where original component specifications are required. Inventory availability of 1424 pieces supports near-term legacy support requirements.

Compliance Considerations: Both devices carry ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification, ensuring equivalent regulatory and export compliance profiles.

Frequently Asked Questions (FAQ)

Q: Can the M48T35-70PC1 directly replace the DS1286+ on existing PCBs?

A: Both devices use 28-DIP Through Hole packaging with parallel interface architecture. Physical package dimensions are nominally equivalent (0.61" vs 0.600" width). Pin compatibility requires verification against specific board layout and pinout documentation, as DIP package variants may have minor dimensional tolerances and lead spacing differences.

Q: What are the key differences between these two RTC devices?

A: The M48T35-70PC1 operates at a minimum supply voltage of 4.75V compared to the DS1286+ at 4.5V. The M48T35-70PC1 supports 24-hour time format only, while the DS1286+ offers both 12-hour and 24-hour formats. Timekeeping current consumption differs: 2mA for the M48T35-70PC1 versus 7mA for the DS1286+. Memory size and battery backup voltage specifications also differ between the two devices.

Q: Are both devices RoHS3 compliant?

A: Yes. Both the DS1286+ and M48T35-70PC1 carry ROHS3 Compliant status and MSL-1 (Unlimited) moisture sensitivity rating, ensuring equivalent environmental and regulatory compliance.

Q: Which device should be selected for new product development?

A: The M48T35-70PC1 is the appropriate choice for new designs due to its Active product status. The DS1286+ is obsolete and should be reserved for legacy system support only.

Q: What is the operating temperature range for both devices?

A: Both devices operate across an identical temperature range of 0°C to 70°C, ensuring thermal compatibility in equivalent application environments.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message