DS1306 Equivalent & Substitute Parts

Part Overview

The DS1306 is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, designed for applications requiring accurate timekeeping with battery backup capability. This device features 96 bytes of nonvolatile static RAM (NVSRAM), SPI interface, and comprehensive alarm functionality across a 2V to 5.5V supply range.

The DS1306 is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support, design updates, and procurement continuity. The primary substitute maintains functional equivalence while offering improved compliance status and active product availability.

Key Parameters

Parameter	Specification
Interface	SPI
Memory Size	96B
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Voltage - Supply	2V ~ 5.5V
Voltage - Supply, Battery	2V ~ 5.5V
Current - Timekeeping (Max)	25.3µA ~ 81µA @ 2V ~ 5V
Operating Temperature	0°C ~ 70°C
Package / Case	16-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Features	Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger

Substitute Part Grouping Explanation

Substitution eligibility for the DS1306 is determined by strict equivalence across the following critical parameters:

Interface Protocol: SPI communication standard
Memory Configuration: 96B NVSRAM capacity
Time/Date Functionality: HH:MM:SS (12/24 hr) and YY-MM-DD-dd formats
Electrical Specifications: 2V ~ 5.5V supply voltage range and timekeeping current characteristics
Package Compatibility: 16-DIP (0.300", 7.62mm) through-hole mounting
Feature Set: Alarm, Leap Year, NVSRAM, Square Wave Output, and Trickle-Charger capabilities

The DS1306+ meets all substitution criteria, maintaining complete functional and electrical equivalence while differing only in product status and compliance certifications.

Parameter Comparison

Parameter	DS1306	DS1306+	Substitution Status
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Equivalent
Category	Clock/Timing	Clock/Timing	Equivalent
Description	IC RTC CLK/CALENDAR SPI 16DIP	IC RTC CLK/CALENDAR SPI 16DIP	Equivalent
Type	Clock/Calendar	Clock/Calendar	Equivalent
Features	Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger	Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger	Equivalent
Memory Size	96B	96B	Equivalent
Time Format	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	Equivalent
Date Format	YY-MM-DD-dd	YY-MM-DD-dd	Equivalent
Interface	SPI	SPI	Equivalent
Voltage - Supply	2V ~ 5.5V	2V ~ 5.5V	Equivalent
Voltage - Supply, Battery	2V ~ 5.5V	2V ~ 5.5V	Equivalent
Current - Timekeeping (Max)	25.3µA ~ 81µA @ 2V ~ 5V	25.3µA ~ 81µA @ 2V ~ 5V	Equivalent
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)	Equivalent
Supplier Device Package	16-PDIP	16-PDIP	Equivalent
Product Status	Obsolete	Active	Improved
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Improved
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
ECCN	EAR99	EAR99	Equivalent
HTSUS	8542.39.0001	8542.39.0001	Equivalent

Engineering Selection Recommendations

The DS1306+ is a direct functional substitute for the DS1306, offering complete electrical and mechanical compatibility. Selection between these parts should be based on the following factors:

For New Designs and Redesigns: The DS1306+ is the appropriate choice. This part carries Active product status, ensuring long-term availability and supply chain stability. The DS1306+ achieves ROHS3 compliance, meeting current environmental and regulatory requirements for component procurement in most jurisdictions.

For Legacy System Support: The DS1306 remains suitable for maintenance and repair of existing systems where the original part specification is required. However, transition to DS1306+ is recommended when design updates or component refreshes occur.

Compliance Considerations: Organizations subject to RoHS directives or equivalent environmental regulations should prioritize DS1306+ to maintain compliance across their bill of materials. The REACH Unaffected status is maintained across both variants.

Frequently Asked Questions (FAQ)

Q: Can DS1306+ be used as a direct replacement for DS1306 in existing designs?

A: Yes. The DS1306+ maintains complete functional, electrical, and mechanical equivalence to the DS1306. Pin configuration, package dimensions, voltage specifications, interface protocol, and feature set are identical. No circuit modifications are required for substitution.

Q: What is the primary difference between DS1306 and DS1306+?

A: The DS1306+ is an active product with ROHS3 compliance, while the DS1306 is obsolete and RoHS non-compliant. All technical specifications and performance characteristics remain unchanged.

Q: Are there any package or pinout differences between these parts?

A: No. Both parts use identical 16-DIP (0.300", 7.62mm) through-hole packaging with the same pin configuration and mechanical footprint.

Q: What supply voltage range do these parts support?

A: Both DS1306 and DS1306+ operate across a 2V to 5.5V supply range for both primary and battery-backed operation, enabling flexible integration into diverse system architectures.

Q: Is the SPI interface identical between both parts?

A: Yes. Both parts implement the same SPI communication protocol with identical timing and signal characteristics.

Q: What is the timekeeping current consumption?

A: Both parts consume 25.3µA to 81µA during timekeeping operation across the 2V to 5V supply range, depending on operating voltage.

Q: Are there any temperature range limitations?

A: Both parts operate across 0°C to 70°C. Applications requiring extended temperature ranges require alternative component selection.

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