RTC-4701JE:B3 ROHS Equivalent & Substitute Parts

Part Overview

The RTC-4701JE:B3 ROHS is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality manufactured by EPSON. This device operates as a 3-Wire Serial interface component in a 20-LSSOJ surface mount package, supporting time formats of HH:MM:SS (24 hr) and date formats of YY-MM-DD-dd. The part is classified as Obsolete, making identification of functionally equivalent substitute components essential for ongoing system support, redesigns, and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	RTC-4701JE:B3 ROHS
Manufacturer	EPSON
Category	Clock/Timing
Type	Clock/Calendar
Interface	3-Wire Serial
Time Format	HH:MM:SS (24 hr)
Date Format	YY-MM-DD-dd
Features	Alarm, Leap Year
Voltage - Supply	1.6V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	20-LSSOJ (0.213", 5.40mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RTC-4701JE:B3 ROHS is determined by the following critical parameters:

Interface Protocol: 3-Wire Serial communication requirement
Time/Date Format Compatibility: HH:MM:SS (24 hr) and YY-MM-DD-dd support
Voltage Supply Range: Minimum 1.6V to 5.5V operating range
Operating Temperature Range: -40°C to 85°C capability
Feature Set: Alarm and Leap Year functionality
Mounting Type: Surface Mount configuration
RoHS Compliance: ROHS3 Compliant status for regulatory alignment

Substitute parts are grouped into two functional categories based on interface type:

Category 1: 3-Wire Serial Interface (Direct Functional Equivalents)

DS1302S+ (8-SOIC package)
DS1302SN+T&R (8-SOIC package)
PT7C4302WEX (8-SOIC package)

Category 2: SPI Interface (Alternative Protocol)

DS1344D-18+T&R (14-WFDFN package)
DS1344D-33+ (14-WFDFN package)

Parameter Comparison

Parameter	RTC-4701JE:B3 ROHS	DS1302S+	DS1302SN+T&R	PT7C4302WEX	DS1344D-18+T&R	DS1344D-33+
Manufacturer	EPSON	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Diodes Incorporated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Type	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar
Interface	3-Wire Serial	3-Wire Serial	3-Wire Serial	3-Wire Serial	SPI	SPI
Time Format	HH:MM:SS (24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
Features	Alarm, Leap Year	Leap Year, NVSRAM, Trickle-Charger	Leap Year, NVSRAM, Trickle-Charger	Leap Year, NVSRAM, Square Wave Output, Trickle-Charger	Alarm, Leap Year, NVRAM, Square Wave Output, Trickle Charger	Alarm, Leap Year, NVRAM, Square Wave Output, Trickle Charger
Memory Size	—	31B	31B	31B	96B	96B
Voltage - Supply	1.6V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	1.2V ~ 5.5V	1.71V ~ 5.5V	3V ~ 5.5V
Voltage - Supply, Battery	—	2V ~ 5.5V	2V ~ 5.5V	1.5V ~ 5.5V	1.3V ~ 5.5V	1.3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-LSSOJ (0.213", 5.40mm Width)	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.154", 3.90mm Width)	14-WFDFN Exposed Pad	14-WFDFN Exposed Pad
Product Status	Obsolete	Active	Active	Obsolete	Obsolete	Active
RoHS Status	ROHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For 3-Wire Serial Interface Applications (Direct Protocol Match):

DS1302SN+T&R is the preferred substitute when 3-Wire Serial interface is required. This part maintains full compatibility with the RTC-4701JE:B3 ROHS communication protocol, supports the required time and date formats, and operates across the -40°C to 85°C temperature range. The part holds Active product status with ROHS3 compliance and unlimited moisture sensitivity rating. High inventory availability (30,200 pcs) supports production continuity.

DS1302S+ provides equivalent 3-Wire Serial functionality with Active product status and ROHS3 compliance. Operating temperature range is limited to 0°C to 70°C, which may restrict use in extended temperature applications. This variant is suitable for standard industrial temperature environments.

PT7C4302WEX offers 3-Wire Serial compatibility with extended voltage supply range (1.2V ~ 5.5V) and full -40°C to 85°C operating temperature support. Product status is Obsolete; however, inventory availability (5,195 pcs) remains adequate for near-term requirements.

For SPI Interface Applications (Protocol Change Required):

DS1344D-33+ is the recommended SPI-based alternative for new designs or redesigns. This part maintains Active product status, ROHS3 compliance, and full -40°C to 85°C operating temperature range. SPI interface requires firmware and PCB-level modifications compared to 3-Wire Serial implementations. Memory capacity increases to 96B, providing expanded data storage capability.

DS1344D-18+T&R provides equivalent SPI functionality with Obsolete product status. Operating temperature range matches the RTC-4701JE:B3 ROHS specification (-40°C to 85°C). SPI protocol implementation requires design modifications.

Frequently Asked Questions (FAQ)

Q: Can DS1302S+ directly replace RTC-4701JE:B3 ROHS without PCB modifications?

A: DS1302S+ maintains 3-Wire Serial interface compatibility and supports identical time/date formats. However, package differences (8-SOIC versus 20-LSSOJ) require PCB layout modifications. Pin-to-pin functional compatibility exists for the serial communication protocol.

Q: What is the primary difference between 3-Wire Serial and SPI interface substitutes?

A: 3-Wire Serial substitutes (DS1302 series, PT7C4302WEX) maintain identical communication protocol with the RTC-4701JE:B3 ROHS, requiring only package-level PCB changes. SPI substitutes (DS1344 series) require firmware modifications and different signal timing implementation, as SPI uses a different serial communication standard.

Q: Why does DS1302S+ have a narrower operating temperature range (0°C to 70°C) compared to DS1302SN+T&R (-40°C to 85°C)?

A: These are different product variants from the same base DS1302 family. DS1302SN+T&R is qualified for extended industrial temperature range, while DS1302S+ is rated for standard commercial temperature range. Selection depends on application temperature requirements.

Q: Is package size change from 20-LSSOJ to 8-SOIC a significant design consideration?

A: Yes. Package footprint, pin count, and PCB routing differ substantially. 20-LSSOJ contains 20 pins while 8-SOIC contains 8 pins. PCB redesign is required, though functional pin mapping exists for the core serial communication signals.

Q: Can PT7C4302WEX be used in high-volume production given its Obsolete status?

A: PT7C4302WEX maintains adequate inventory (5,195 pcs) for near-term production. However, Obsolete product status indicates no future manufacturing. For long-term production programs, Active status parts (DS1302SN+T&R or DS1344D-33+) are recommended.

Q: What additional features do substitute parts provide beyond the RTC-4701JE:B3 ROHS specification?

A: DS1302 series adds NVSRAM and Trickle-Charger functionality. DS1344 series adds NVRAM, Square Wave Output, and Trickle Charger with increased memory capacity (96B versus 31B). These features are available but not required for basic clock/calendar operation.

Q: Does RoHS compliance differ between the main part and substitutes?

A: RTC-4701JE:B3 ROHS is ROHS Compliant. All substitute parts are ROHS3 Compliant, representing a more recent compliance standard. ROHS3 compliance is backward compatible with ROHS requirements.

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