DS1302N Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The DS1302N is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This 8-DIP through-hole component provides 31 bytes of non-volatile static RAM (NVSRAM), leap year support, and a trickle-charger feature. The DS1302N operates across a 2V to 5.5V supply range with minimal timekeeping current consumption of 0.3µA to 1µA.

The DS1302N is classified as obsolete. Equivalent and substitute parts are necessary for new designs, production continuations, and applications requiring active product status or enhanced compliance certifications such as RoHS3.

Substiute Parts

DS1302N

Analog Devices Inc./Maxim IntegratedIn Stock: 2099DS1302N Datasheet

Current PartRFQ

DS1302N+

Analog Devices Inc./Maxim IntegratedIn Stock: 1965DS1302N+ Datasheet

DirectRFQ

RX-4571LC:B PURE SN

EPSONIn Stock: 899RX-4571LC:B PURE SN Datasheet

MFR RecommendedRFQ

RX-4571NB:B

EPSONIn Stock: 1162RX-4571NB:B Datasheet

MFR RecommendedRFQ

S-35192A-I8T1U

ABLIC Inc.In Stock: 776S-35192A-I8T1U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DS1302N are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Compatibility Parameters:

• Interface type: 3-Wire Serial (mandatory match)
• Operating temperature range: -40°C to 85°C (mandatory match)
• Time and date format support: HH:MM:SS (12/24 hr) and YY-MM-DD-dd
• Supply voltage range: Minimum 2V, maximum 5.5V
• Timekeeping current consumption: ≤1µA @ operating voltage

Substitution Categories:

1. Direct Pin-Compatible Substitute (Same Package): DS1302N+ maintains identical 8-DIP packaging and pinout, enabling direct board-level replacement without layout modification.

2. Functional Equivalents with Package Variation: RX-4571LC:B (12-TFSOJ surface mount) and RX-4571NB:B (22-LFDFN surface mount) provide equivalent RTC functionality with 3-Wire Serial interface and matching operating temperature range. These require PCB redesign due to different package types.

3. Alternative Footprint with Extended Voltage Range: S-35192A-I8T1U (8-SMD, Flat Lead) offers extended supply voltage (1.3V to 5.5V) and maintains time/date format compatibility, requiring surface-mount assembly.

Parameter Comparison

Engineering Selection Recommendations

DS1302N+ (Direct Replacement): Select DS1302N+ for applications requiring immediate substitution of obsolete DS1302N units without PCB modification. This part maintains identical pinout, package, and electrical specifications while offering active product status and RoHS3 compliance. Recommended for production continuations and retrofit applications.

RX-4571LC:B and RX-4571NB:B (Surface Mount Alternatives): These EPSON RTC ICs are suitable for new designs utilizing surface-mount assembly. Both maintain 3-Wire Serial interface and -40°C to 85°C operating temperature range. RX-4571LC:B uses 12-TFSOJ packaging (0.094" width), while RX-4571NB:B uses 22-LFDFN packaging. Both offer RoHS3 compliance and active product status. PCB redesign is required due to different package footprints.

S-35192A-I8T1U (Extended Voltage Range): Select S-35192A-I8T1U for applications requiring extended supply voltage operation (1.3V minimum) or surface-mount assembly. This ABLIC part maintains time/date format compatibility and 3-Wire Serial interface. Note that timekeeping current consumption is higher (8µA to 14µA) compared to DS1302N specifications. RoHS3 compliant and active product status.

Frequently Asked Questions (FAQ)

Q: Can DS1302N+ be used as a direct replacement for DS1302N on existing PCBs?

A: Yes. DS1302N+ is pin-compatible and maintains identical electrical specifications. No PCB modification is required. The primary difference is active product status and RoHS3 compliance certification.

Q: What are the key differences between through-hole DS1302N+ and surface-mount alternatives?

A: DS1302N+ retains the 8-DIP through-hole package for direct board replacement. RX-4571LC:B and RX-4571NB:B require surface-mount assembly and PCB redesign. S-35192A-I8T1U also requires surface-mount assembly with an 8-SMD flat-lead package.

Q: Are RX-4571LC:B and RX-4571NB:B functionally equivalent to DS1302N?

A: Both EPSON parts maintain 3-Wire Serial interface and -40°C to 85°C operating temperature range. However, time and date format specifications are not provided for these parts. Verify firmware compatibility before selection. Both offer RoHS3 compliance and active product status.

Q: What is the impact of higher timekeeping current in S-35192A-I8T1U?

A: S-35192A-I8T1U consumes 8µA to 14µA during timekeeping, compared to 0.3µA to 1µA for DS1302N. This results in increased battery drain in battery-backed applications. Select this part only when extended voltage range (1.3V minimum) is a design requirement.

Q: Which substitute part offers the best compliance profile?

A: All substitute parts (DS1302N+, RX-4571LC:B, RX-4571NB:B, and S-35192A-I8T1U) are RoHS3 compliant with active product status. DS1302N+ is recommended for compliance-critical applications requiring minimal design changes.

Q: Can these parts be used interchangeably in new designs?

A: No. Package type, mounting method, and electrical specifications differ. DS1302N+ is suitable for through-hole designs. RX-4571LC:B, RX-4571NB:B, and S-35192A-I8T1U require surface-mount assembly and firmware validation. Select based on PCB assembly capability and design requirements.