DS1302S-16 Equivalent & Substitute Parts

Part Overview

The DS1302S-16 is a Real Time Clock (RTC) IC with integrated clock/calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This device provides 31 bytes of nonvolatile static RAM (NVSRAM), leap year support, and a trickle-charger feature. The part operates via a 3-wire serial interface and supports both 12-hour and 24-hour time formats with date tracking.

The DS1302S-16 is classified as obsolete. Locating equivalent substitute parts becomes necessary for new designs, production continuity, or system upgrades where the original component is no longer readily available or manufactured.

Substiute Parts

DS1302S-16

Analog Devices Inc./Maxim IntegratedIn Stock: 1093DS1302S-16 Datasheet

Current PartRFQ

S-35190A-I8T1U

ABLIC Inc.In Stock: 3016S-35190A-I8T1U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS1302S-16 is determined by the following critical parameters:

• Interface Type: 3-Wire Serial protocol compatibility
• Time and Date Format Support: HH:MM:SS (12/24 hr) and YY-MM-DD-dd formats
• Supply Voltage Range: Minimum 2V operation and maximum 5.5V tolerance
• Package Compatibility: Surface mount form factor suitable for PCB integration
• Functional Features: Clock/calendar capability with leap year support
• Regulatory Compliance: RoHS3 compliance for environmental standards

The S-35190A-I8T1U meets these core substitution criteria. While it operates across a wider voltage range (1.3V ~ 5.5V) and temperature range (-40°C ~ 85°C), it maintains the essential 3-wire serial interface, identical time/date format support, and RoHS3 compliance. The substitute part is classified as active product status, ensuring ongoing availability.

Parameter Comparison

Engineering Selection Recommendations

The S-35190A-I8T1U is a suitable substitute for the DS1302S-16 based on the following engineering criteria:

Product Status and Availability: The S-35190A-I8T1U is classified as active product status, ensuring long-term availability and supply chain continuity. The DS1302S-16 is obsolete, making the substitute necessary for ongoing production and new designs.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting environmental and regulatory requirements for industrial and commercial applications.

Functional Compatibility: Both devices support identical time and date formats (HH:MM:SS 12/24 hr and YY-MM-DD-dd), 3-wire serial interface protocol, and leap year functionality. These core features ensure functional equivalence in clock/calendar applications.

Electrical Parameters: The S-35190A-I8T1U operates across a wider supply voltage range (1.3V ~ 5.5V) compared to the DS1302S-16 (2V ~ 5.5V), providing enhanced flexibility for low-voltage applications. The substitute part's extended operating temperature range (-40°C ~ 85°C) exceeds the original part's range (0°C ~ 70°C), supporting broader environmental conditions.

Package Consideration: The substitute part uses an 8-SMD flat lead package versus the original 16-SOIC package. PCB layout and footprint modifications are required during integration.

Frequently Asked Questions (FAQ)

Q: Can the S-35190A-I8T1U directly replace the DS1302S-16 without firmware changes?

A: The S-35190A-I8T1U maintains the same 3-wire serial interface protocol and identical time/date format support as the DS1302S-16. However, the package footprint differs (8-SMD flat lead versus 16-SOIC), requiring PCB layout modifications. Firmware compatibility depends on the specific register map and command set implementation in your application.

Q: What are the key differences in operating conditions?

A: The S-35190A-I8T1U supports a lower minimum supply voltage (1.3V versus 2V) and operates across a wider temperature range (-40°C to 85°C versus 0°C to 70°C). These extended specifications provide greater design flexibility for applications requiring low-power operation or extreme environmental conditions.

Q: Are both parts RoHS compliant?

A: Yes, both the DS1302S-16 and S-35190A-I8T1U are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

Q: What is the primary reason for substitution?

A: The DS1302S-16 is classified as obsolete, meaning the manufacturer has discontinued production. The S-35190A-I8T1U is an active product with ongoing availability, making it the appropriate choice for new designs and production continuity.

Q: How do the memory and feature sets compare?

A: The DS1302S-16 includes 31 bytes of NVSRAM and a trickle-charger feature. The S-35190A-I8T1U provides alarm functionality and leap year support. Both devices support clock/calendar operations; feature selection depends on specific application requirements.

Q: What packaging considerations apply to this substitution?

A: The DS1302S-16 uses a 16-SOIC package (0.295", 7.50mm width), while the S-35190A-I8T1U uses an 8-SMD flat lead package. PCB footprint redesign and component placement modifications are necessary for physical integration.