DS1302S Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The DS1302S is a Real Time Clock (RTC) IC manufactured by Analog Devices Inc./Maxim Integrated, designed for clock/calendar applications requiring 3-wire serial interface communication. The device integrates 31 bytes of nonvolatile static RAM (NVSRAM), leap year compensation, and a trickle-charger function within an 8-SOIC surface mount package.

The DS1302S is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. Active substitute parts maintain identical electrical and mechanical specifications while offering current product status and improved compliance certifications.

Substiute Parts

DS1302S

Analog Devices Inc./Maxim IntegratedIn Stock: 1267DS1302S Datasheet

Current PartRFQ

DS1302S+

Analog Devices Inc./Maxim IntegratedIn Stock: 1952DS1302S+ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS1302S is determined by strict equivalence across the following critical parameters:

• Memory capacity: 31 bytes NVSRAM
• Serial interface protocol: 3-wire serial configuration
• Time and date format support: HH:MM:SS (12/24 hr) and YY-MM-DD-dd
• Supply voltage compatibility: 2V to 5.5V operating and battery supply
• Timekeeping current specifications: 0.3µA to 1µA @ 2V to 5V
• Operating temperature range: 0°C to 70°C
• Package and pinout: 8-SOIC (0.209", 5.30mm Width)
• Functional features: Leap year compensation, NVSRAM, trickle-charger

The DS1302S+ is a direct substitute that maintains 100% electrical and mechanical compatibility while offering active product status and improved regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The DS1302S+ is the direct equivalent substitute for the DS1302S. Both parts share identical electrical specifications, memory architecture, interface protocol, and physical package dimensions. The primary distinction is product lifecycle status: the DS1302S is obsolete while the DS1302S+ maintains active production status.

For new designs and ongoing production, the DS1302S+ is the appropriate selection. The substitute offers ROHS3 compliance, addressing regulatory requirements that the original DS1302S does not meet. Tube packaging for the DS1302S+ provides standard handling and storage conditions for surface mount components.

No functional or electrical modifications to circuit design are required when transitioning from DS1302S to DS1302S+. Pin configuration, voltage requirements, current consumption, and operational characteristics remain identical.

Frequently Asked Questions (FAQ)

Q: Can DS1302S+ be used as a direct replacement for DS1302S in existing designs?

A: Yes. The DS1302S+ maintains 100% electrical and mechanical compatibility with the DS1302S. No circuit modifications, firmware changes, or PCB redesign are necessary. Pin assignments, voltage levels, current specifications, and functional features are identical.

Q: What is the primary reason to substitute DS1302S with DS1302S+?

A: The DS1302S is classified as obsolete, limiting availability for new production and long-term supply assurance. The DS1302S+ is an active product offering equivalent functionality with improved regulatory compliance (ROHS3).

Q: Are there any differences in package dimensions between DS1302S and DS1302S+?

A: No. Both parts use the 8-SOIC (0.209", 5.30mm Width) surface mount package with identical pinout and physical dimensions. PCB footprints and assembly processes remain unchanged.

Q: Does the DS1302S+ support the same 3-wire serial interface protocol?

A: Yes. The DS1302S+ implements the identical 3-wire serial interface as the DS1302S, ensuring software and firmware compatibility without modification.

Q: What are the supply voltage requirements for DS1302S+?

A: The DS1302S+ operates with supply voltage from 2V to 5.5V and battery supply voltage from 2V to 5.5V, matching the DS1302S specifications exactly.

Q: Is the timekeeping current consumption the same for both parts?

A: Yes. Maximum timekeeping current for DS1302S+ is 0.3µA to 1µA @ 2V to 5V, identical to the DS1302S specification.

Q: What is the operating temperature range for DS1302S+?

A: The DS1302S+ operates across 0°C to 70°C, matching the DS1302S operating temperature range.