DS1678+ Equivalent & Substitute Parts

Part Overview

The DS1678+ is an Active-status Real Time Clock (RTC) IC Time Event Recorder manufactured by Analog Devices Inc./Maxim Integrated. This through-hole 8-DIP device provides I2C/2-Wire Serial interface functionality with integrated alarm, leap year, NVSRAM, and Y2K features. The DS1678+ operates across a 4.5V to 5.5V supply range with battery backup capability (2.6V to 4.6V) and maintains operation across -40°C to 85°C. Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameters for RTC Time Event Recorder applications.

Substiute Parts

DS1678+

Analog Devices Inc./Maxim IntegratedIn Stock: 987DS1678+ Datasheet

Current PartRFQ

RX-8035SA:AC0 PURE SN

EPSONIn Stock: 976RX-8035SA:AC0 PURE SN Datasheet

MFR RecommendedRFQ

RX8130CE B0

EPSONIn Stock: 8065RX8130CE B0 Datasheet

MFR RecommendedRFQ

RX8130CE:BB

EPSONIn Stock: 936RX8130CE:BB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS1678+ is determined by the following critical parameters:

Primary Compatibility Criteria:

• Category: Clock/Timing
• Type: Time Event Recorder
• Interface: I2C, 2-Wire Serial
• Operating Temperature Range: -40°C ~ 85°C (minimum requirement)
• Product Status: Active
• RoHS Compliance: ROHS3 Compliant

Secondary Compatibility Considerations:

• Voltage Supply Range: Must support operation within or encompass the DS1678+ range (4.5V ~ 5.5V)
• Mounting Type: Through Hole preferred; Surface Mount substitutes acceptable with design accommodation
• Package compatibility: Electrical equivalence takes precedence over package form factor

The identified substitutes (RX-8035SA:AC0 PURE SN, RX8130CE B0, RX8130CE:BB) meet the primary criteria as I2C-based RTC Time Event Recorder devices with Active product status and ROHS3 compliance. All operate across the -40°C to 85°C temperature range. Voltage supply ranges vary; RX-8035SA:AC0 PURE SN supports 2.4V ~ 5.5V, while RX8130CE variants support 1.25V ~ 5.5V, both encompassing the DS1678+ requirement.

Parameter Comparison

Engineering Selection Recommendations

All identified substitutes maintain Active product status and ROHS3 compliance, meeting regulatory and supply continuity requirements equivalent to the DS1678+.

RX-8035SA:AC0 PURE SN (EPSON): This 14-SOIC surface-mount device provides I2C/2-Wire Serial interface with alarm functionality. Supply voltage range (2.4V ~ 5.5V) encompasses the DS1678+ operating window. Battery backup support (1V ~ 5.5V) exceeds the DS1678+ specification. Current consumption during timekeeping (2.5µA @ 3V) is documented. Package transition from 8-DIP to 14-SOIC requires PCB layout modification.

RX8130CE B0 and RX8130CE:BB (EPSON): These 10-SMD no-lead surface-mount devices provide I2C interface with alarm functionality. Supply voltage range (1.25V ~ 5.5V) encompasses the DS1678+ operating window. Current consumption during timekeeping (0.5µA @ 3V) is lower than RX-8035SA:AC0 PURE SN. Both variants are electrically identical; RX8130CE B0 is supplied in Tape & Reel packaging while RX8130CE:BB is supplied in Bulk packaging. Package transition from 8-DIP to 10-SMD requires PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can RX-8035SA:AC0 PURE SN directly replace DS1678+ in a through-hole application?

A: No. RX-8035SA:AC0 PURE SN is a surface-mount 14-SOIC device, while DS1678+ is a through-hole 8-DIP device. Direct socket replacement is not possible. PCB redesign and adapter solutions are required for integration.

Q: What are the key electrical differences between DS1678+ and the RX8130CE variants?

A: DS1678+ operates at 4.5V ~ 5.5V supply with 32B memory and supports 12/24-hour time format with YY-MM-DD-dd date format. RX8130CE variants operate at 1.25V ~ 5.5V supply with lower timekeeping current (0.5µA @ 3V). Memory size and time/date format specifications are not provided for RX8130CE variants in the available data.

Q: Are all three substitutes suitable for battery-backed operation?

A: DS1678+ supports battery backup at 2.6V ~ 4.6V. RX-8035SA:AC0 PURE SN supports battery backup at 1V ~ 5.5V. RX8130CE B0 and RX8130CE:BB do not specify battery backup voltage ranges in the available data.

Q: What is the difference between RX8130CE B0 and RX8130CE:BB?

A: Both are electrically identical 10-SMD no-lead RTC devices. The difference is packaging: RX8130CE B0 is supplied in Tape & Reel (TR) format, while RX8130CE:BB is supplied in Bulk format. Selection depends on procurement and assembly requirements.

Q: Do all substitutes meet the same compliance standards as DS1678+?

A: Yes. All identified substitutes are ROHS3 Compliant, carry EAR99 ECCN classification, and maintain MSL Rating 1 (Unlimited), matching DS1678+ compliance profile.

Q: What mounting considerations apply when transitioning from DS1678+ to surface-mount substitutes?

A: DS1678+ is through-hole mounted (8-DIP). All substitutes are surface-mount devices (14-SOIC or 10-SMD). PCB redesign is required to accommodate surface-mount footprints, solder reflow processes, and layout routing changes.