DS1286 Real Time Clock IC - 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 device provides parallel interface timekeeping with alarm, leap year compensation, square wave output, SRAM, and watchdog timer capabilities in a 28-DIP package. The DS1286 is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing system support and new design implementations.

Substiute Parts

DS1286

Analog Devices Inc./Maxim IntegratedIn Stock: 1363DS1286 Datasheet

Current PartRFQ

M48T35-70PC1

STMicroelectronicsIn Stock: 7799M48T35-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Primary Compatibility Criteria:

• Package type: 28-DIP Module through-hole mounting
• Interface: Parallel communication protocol
• Functional category: Real Time Clock with Clock/Calendar capability
• Operating temperature range: 0°C ~ 70°C
• Supply voltage compatibility: 4.5V ~ 5.5V nominal operation

Substitution Logic: The M48T35-70PC1 (STMicroelectronics Timekeeper® series) qualifies as a substitute based on matching package configuration (28-DIP), parallel interface architecture, clock/calendar functionality, identical operating temperature range, and overlapping supply voltage specifications. Both devices support through-hole mounting and provide real-time clock capability with calendar functions.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The DS1286 is classified as obsolete. The M48T35-70PC1 is an active product from STMicroelectronics, ensuring ongoing availability and manufacturing support.

Compliance Status: The DS1286 is RoHS non-compliant. The M48T35-70PC1 is ROHS3 compliant, meeting current regulatory requirements for electronic component procurement in regulated industries.

Certification Alignment: Both devices carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, indicating equivalent export control and tariff treatment. Both maintain REACH Unaffected status and Moisture Sensitivity Level 1 (Unlimited).

Selection Basis: Component selection should prioritize the M48T35-70PC1 for new designs and ongoing system support due to active product status and RoHS3 compliance. The DS1286 remains suitable only for legacy system maintenance where original component specifications are mandated.

Frequently Asked Questions (FAQ)

Q: Can the M48T35-70PC1 directly replace the DS1286 in existing designs? A: Physical package compatibility exists (both 28-DIP through-hole), and functional compatibility is established through parallel interface and clock/calendar capability. Verify time format requirements in your application, as the M48T35-70PC1 operates in 24-hour format while the DS1286 supports both 12 and 24-hour modes.

Q: What is the significance of the package dimension difference (0.61" vs 0.600")? A: The dimensional variance (0.61" versus 0.600") represents a 0.01" difference in body length. Both devices use standard 28-DIP through-hole footprints and are mechanically compatible with equivalent PCB socket configurations.

Q: Why is RoHS compliance important for this substitution? A: RoHS3 compliance of the M48T35-70PC1 ensures compatibility with current procurement standards in regulated industries and future-proofs designs against evolving environmental regulations. The DS1286's non-compliant status may restrict its use in new system designs.

Q: Are there differences in power consumption between these devices? A: The M48T35-70PC1 demonstrates lower timekeeping current (2mA @ 4.75V ~ 5.5V) compared to the DS1286 (7mA @ 5V), resulting in reduced power dissipation and extended battery life in battery-backed applications.

Q: What supply voltage range should be used for compatibility? A: The overlapping supply voltage range is 4.75V ~ 5.5V. Both devices operate within this window. The DS1286 supports operation down to 4.5V, while the M48T35-70PC1 minimum is 4.75V.