DS1302Z Real Time Clock IC - Equivalent & Substitute Parts

Part Overview

The DS1302Z 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. This component provides 31 bytes of non-volatile static RAM (NVSRAM) with integrated trickle-charger functionality and supports both 12-hour and 24-hour time formats.

The DS1302Z is classified as obsolete, which necessitates identification of equivalent substitute parts for new designs and ongoing production requirements. Active alternative models with identical electrical and mechanical specifications are available to ensure design continuity.

Substiute Parts

DS1302Z

Analog Devices Inc./Maxim IntegratedIn Stock: 19801DS1302Z Datasheet

Current PartRFQ

DS1302Z+

Analog Devices Inc./Maxim IntegratedIn Stock: 1298DS1302Z+ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS1302Z is determined by strict equivalence across the following critical parameters:

• Package / Case: 8-SOIC (0.154", 3.90mm Width) — ensures mechanical and thermal compatibility
• Memory Size: 31 Bytes — maintains functional capacity for calendar and timekeeping data
• Interface Type: 3-Wire Serial — preserves communication protocol compatibility with existing designs
• Voltage - Supply: 2V ~ 5.5V — ensures operation across the same supply range
• Voltage - Supply, Battery: 2V ~ 5.5V — maintains backup power compatibility
• Current - Timekeeping (Max): 0.3µA ~ 1µA @ 2V ~ 5V — preserves power consumption characteristics
• Operating Temperature: 0°C ~ 70°C — maintains thermal operating range
• Time/Date Format: HH:MM:SS (12/24 hr) and YY-MM-DD-dd — ensures functional equivalence
• Features: Leap Year, NVSRAM, Trickle-Charger — confirms feature parity

The DS1302Z+ is a direct substitute that meets all specified electrical and mechanical parameters while offering active product status and improved compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The DS1302Z+ is the direct equivalent substitute for the DS1302Z. Both components share identical electrical specifications, memory capacity, interface protocol, and thermal characteristics. The primary distinction is product lifecycle status: the DS1302Z is obsolete, while the DS1302Z+ maintains active production status.

The DS1302Z+ offers additional compliance advantages: it is ROHS3 compliant, whereas the original DS1302Z is RoHS non-compliant. For new designs and production environments subject to RoHS regulations, the DS1302Z+ is the appropriate selection. Both components are REACH Unaffected and classified under ECCN EAR99.

Packaging differs between the two variants: the DS1302Z+ is supplied in Tube packaging, which may affect procurement and handling procedures compared to the original specification.

Frequently Asked Questions (FAQ)

Q: Can the DS1302Z+ be used as a direct replacement for the DS1302Z in existing designs?

A: Yes. The DS1302Z+ is electrically and mechanically equivalent to the DS1302Z. All electrical parameters, package dimensions, pin configuration, and functional specifications are identical. No circuit modifications are required.

Q: What is the significance of the product status change from Obsolete to Active?

A: The DS1302Z is no longer manufactured. The DS1302Z+ is the active production equivalent, ensuring continued availability for new production runs and design implementations. Selecting the active part eliminates supply chain risk.

Q: Are there any compliance differences between the two parts?

A: Yes. The DS1302Z+ is ROHS3 compliant, while the DS1302Z is RoHS non-compliant. For applications subject to RoHS directives, the DS1302Z+ is the required selection. Both parts are REACH Unaffected.

Q: Does the packaging change from unspecified to Tube affect compatibility?

A: No. Tube packaging is a standard surface mount component delivery format. It does not affect electrical performance or PCB assembly compatibility. Packaging changes only impact procurement, storage, and handling procedures.

Q: Are the 3-Wire Serial interface protocols identical between both parts?

A: Yes. Both the DS1302Z and DS1302Z+ implement the same 3-Wire Serial communication protocol. Firmware and software interfaces require no modification.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is determined by equivalence in package type (8-SOIC), memory size (31 Bytes), interface protocol (3-Wire Serial), supply voltage range (2V ~ 5.5V), timekeeping current specifications (0.3µA ~ 1µA), operating temperature range (0°C ~ 70°C), and feature set (Leap Year, NVSRAM, Trickle-Charger).