DS1306N Equivalent & Substitute Parts

Part Overview

The DS1306N is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This device provides 96 bytes of NVSRAM, SPI interface, and features including alarm capability, leap year compensation, and square wave output. The DS1306N is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

DS1306N

Analog Devices Inc./Maxim IntegratedIn Stock: 2242DS1306N Datasheet

Current PartRFQ

DS1306N+

Analog Devices Inc./Maxim IntegratedIn Stock: 1195DS1306N+ Datasheet

DirectRFQ

S-35190A-J8T1U

ABLIC Inc.In Stock: 12112S-35190A-J8T1U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DS1306N is determined by the following critical parameters:

Primary Substitution Criteria:

• Clock/Calendar functionality with compatible time and date formats (HH:MM:SS 12/24 hr, YY-MM-DD-dd)
• Operating temperature range of -40°C to 85°C
• Supply voltage compatibility within 2V to 5.5V range
• Alarm and leap year features
• RTC interface capability (SPI or equivalent serial protocol)

Substitute Parts Identified:

1. DS1306N+ (Direct Manufacturer Equivalent): Identical electrical and functional specifications to DS1306N. Differs only in packaging format (Tube vs. unspecified for original) and product status (Active vs. Obsolete). Maintains 16-DIP through-hole package and SPI interface.

2. S-35190A-J8T1U (Manufacturer-Recommended Alternative): ABLIC Inc. RTC with Clock/Calendar functionality. Provides compatible time/date formats and operating temperature range. Uses 3-Wire Serial interface instead of SPI. Surface-mount 8-SOIC package. Lower timekeeping current consumption (8µA ~ 14µA vs. 25.3µA ~ 81µA). Does not include NVSRAM or square wave output features.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): DS1306N+ is the optimal substitute when form factor and feature set must remain unchanged. It maintains identical electrical specifications, package type (16-DIP through-hole), and all functional features including NVSRAM and square wave output. The primary advantage is active product status and ROHS3 compliance, eliminating obsolescence risk.

For Design Flexibility: S-35190A-J8T1U is suitable when circuit board redesign is acceptable and lower power consumption is beneficial. This substitute requires interface protocol conversion from SPI to 3-Wire Serial and PCB layout modification for surface-mount implementation. The reduced timekeeping current (8µA ~ 14µA) provides power efficiency advantages. Note that NVSRAM and square wave output features are not available with this substitute.

Compliance Considerations: DS1306N is RoHS non-compliant. Both substitute parts (DS1306N+ and S-35190A-J8T1U) are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Frequently Asked Questions (FAQ)

Q: Can DS1306N+ be used as a direct drop-in replacement for DS1306N? A: Yes. DS1306N+ maintains identical electrical specifications, package type, and functional features. The only differences are packaging format and active product status. No circuit modifications are required.

Q: What are the key differences between DS1306N and S-35190A-J8T1U? A: The primary differences are interface protocol (SPI vs. 3-Wire Serial), package type (16-DIP through-hole vs. 8-SOIC surface-mount), memory configuration (96B NVSRAM vs. unspecified), and feature set (S-35190A-J8T1U lacks NVSRAM and square wave output). Timekeeping current consumption is significantly lower in the S-35190A-J8T1U.

Q: Is the S-35190A-J8T1U compatible with existing DS1306N circuit designs? A: Direct compatibility requires circuit redesign. The different interface protocol (3-Wire Serial vs. SPI) necessitates firmware and hardware modifications. The surface-mount package also requires PCB layout changes from through-hole implementation.

Q: What is the minimum supply voltage for each part? A: DS1306N and DS1306N+ operate from 2V minimum. S-35190A-J8T1U operates from 1.3V minimum, providing lower voltage operation capability.

Q: Are all substitute parts compliant with current RoHS regulations? A: DS1306N+ and S-35190A-J8T1U are both ROHS3 compliant. The original DS1306N is RoHS non-compliant and should not be used in new designs subject to RoHS requirements.

Q: Which substitute should be selected for new production designs? A: DS1306N+ is recommended for new designs requiring direct compatibility with existing DS1306N implementations. S-35190A-J8T1U is suitable for new designs where interface protocol and package type flexibility exist and power consumption optimization is a priority.