Equivalent & Substitute Parts for 1339-31DCGI8

Part Overview

The Renesas Electronics Corporation 1339-31DCGI8 is a Real Time Clock (RTC) IC with Clock/Calendar functionality, featuring I2C 2-Wire Serial interface in an 8-SOIC package. This device provides timekeeping with alarm capability, leap year support, and square wave output, operating across a 3.3V to 5.5V supply range with battery backup from 1.3V to 3.7V. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are necessary when the original 1339-31DCGI8 becomes unavailable, when alternative packaging or thermal characteristics better suit application requirements, or when design revisions require different voltage operating ranges or power consumption profiles.

Key Parameters

Parameter	1339-31DCGI8
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Package / Case	8-SOIC (0.154", 3.90mm Width)
Voltage - Supply	3.3V ~ 5.5V
Voltage - Supply, Battery	1.3V ~ 3.7V
Current - Timekeeping (Max)	200µA @ 3.63V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Features	Alarm, Leap Year, Square Wave Output, Trickle-Charger
Mounting Type	Surface Mount
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 1339-31DCGI8 is determined by the following critical parameters:

Interface Compatibility: All substitute parts must support I2C 2-Wire Serial communication to maintain firmware and PCB layout compatibility.

Voltage Operating Range: The main part operates at 3.3V to 5.5V supply with 1.3V to 3.7V battery backup. Substitute parts must support overlapping or broader voltage ranges to ensure operation across the same application conditions.

Package Compatibility: The 8-SOIC (0.154", 3.90mm Width) surface mount package defines the physical footprint. Substitutes in different packages (8-WCDFN, 8-TSSOP, 8-DIP, 8-MSOP) require PCB redesign and are classified as functional alternatives rather than direct pin-compatible replacements.

Functional Features: Core features including alarm capability, leap year support, and timekeeping format (HH:MM:SS with 12/24 hour and YY-MM-DD-dd date format) must be present in substitute parts.

Operating Temperature Range: All substitutes must support the -40°C to 85°C operating window.

Compliance & Status: Active product status and ROHS3 compliance are required for new designs and procurement continuity.

Parameter Comparison

Parameter	1339-31DCGI8	AB-RTCMC-32.768KHZ-AIGZ-S7-T	BU9873FVT-GE2	DS1307N+	DS1308U-18+T	DS1308U-3+	DS1308U-33+	DS1308U-33+T	DS1337S+	DS1338Z-3+T&R	DS1340C-18#
Manufacturer	Renesas	Abracon LLC	Rohm Semiconductor	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim
Interface	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial
Package / Case	8-SOIC (0.154", 3.90mm)	8-WCDFN	8-TSSOP (0.173", 4.40mm)	8-DIP (0.300", 7.62mm)	8-TSSOP, 8-MSOP (0.118", 3.00mm)	8-TSSOP, 8-MSOP (0.118", 3.00mm)	8-TSSOP, 8-MSOP (0.118", 3.00mm)	8-TSSOP, 8-MSOP (0.118", 3.00mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	16-SOIC (0.295", 7.50mm)
Voltage - Supply	3.3V ~ 5.5V	1V ~ 4.4V	1.8V ~ 5.5V	4.5V ~ 5.5V	1.71V ~ 5.5V	2.7V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V	1.8V ~ 5.5V	2.7V ~ 5.5V	1.71V ~ 5.5V
Voltage - Supply, Battery	1.3V ~ 3.7V	—	—	2V ~ 4.6V	1.3V ~ 5.5V	1.3V ~ 5.5V	1.3V ~ 5.5V	1.3V ~ 5.5V	—	1.3V ~ 3.7V	1.3V ~ 3.7V
Current - Timekeeping (Max)	200µA @ 3.63V ~ 5.5V	0.4µA ~ 0.95µA @ 1V ~ 4.4V	1µA ~ 1.35µA @ 3V ~ 5.5V	200µA @ 5V	100µA @ 200µA @ 1.89V ~ 5.5V	—	125µA ~ 200µA @ 3V ~ 5.5V	125µA ~ 200µA @ 3V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	200µA @ 3.3V	100µA @ 1.89V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Time Format	HH:MM:SS (12/24 hr)	HH:MM:SS:hh (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)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (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	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
Features	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Alarm, Leap Year, Watchdog Timer	Alarm, Leap Year	Leap Year, NVSRAM, Square Wave Output	Leap Year, NVSRAM, Square Wave Output	Leap Year, NVSRAM, Square Wave Output	Leap Year, NVSRAM, Square Wave Output	Leap Year, NVSRAM, Square Wave Output	Alarm, Leap Year, Square Wave Output	Leap Year, NVSRAM, Square Wave Output	Leap Year, Trickle-Charger
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Active	Not For New Designs	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Pin-Compatible Substitutes (8-SOIC Package):

DS1337S+ and DS1338Z-3+T&R are the closest functional alternatives to the 1339-31DCGI8, both housed in the same 8-SOIC (0.154", 3.90mm Width) package. DS1337S+ operates across 1.8V to 5.5V supply range with ultra-low timekeeping current of 0.6µA at 1.3V to 1.8V, making it suitable for battery-powered applications requiring extended runtime. DS1338Z-3+T&R provides 56B NVSRAM with supply range of 2.7V to 5.5V and battery backup from 1.3V to 3.7V, matching the original part's battery voltage specification. Both parts are in active production status with ROHS3 compliance.

Functional Alternatives with Package Redesign:

AB-RTCMC-32.768KHZ-AIGZ-S7-T (Abracon LLC, 8-WCDFN package) offers exceptional low-power performance with timekeeping current of 0.4µA to 0.95µA across 1V to 4.4V supply range. This part is suitable for ultra-low-power applications but requires PCB layout modification due to different package footprint. Active product status and ROHS3 compliance are confirmed.

BU9873FVT-GE2 (Rohm Semiconductor, 8-TSSOP package) is marked as "Not For New Designs" and should be avoided for new product development despite active inventory availability.

DS1308 variants (DS1308U-18+T, DS1308U-3+, DS1308U-33+, DS1308U-33+T) in 8-TSSOP/8-MSOP packages provide 56B NVSRAM and square wave output. These parts require PCB redesign but offer broader voltage compatibility (1.71V to 5.5V supply) and are all in active production status.

Through-Hole Alternative:

DS1307N+ (8-DIP package) is a through-hole option suitable for legacy or prototype applications. This part operates at 4.5V to 5.5V supply with 2V to 4.6V battery backup, narrower than the original part's specifications. Through-hole mounting requires different PCB design approach.

Extended Feature Option:

DS1340C-18# (16-SOIC package) provides trickle-charger functionality matching the original part but in a larger 16-pin package requiring significant PCB redesign. This part operates across 1.71V to 5.5V supply with 1.3V to 3.7V battery backup.

Frequently Asked Questions (FAQ)

Q: Can DS1337S+ or DS1338Z-3+T&R be used as direct replacements for 1339-31DCGI8 without PCB modification?

A: Yes. Both DS1337S+ and DS1338Z-3+T&R share the identical 8-SOIC (0.154", 3.90mm Width) package footprint with the 1339-31DCGI8. Pin-to-pin compatibility requires verification against device datasheets, but package dimensions allow direct PCB substitution without layout changes.

Q: What is the key difference between DS1338Z-3+T&R and DS1337S+?

A: DS1338Z-3+T&R includes 56B NVSRAM (Non-Volatile Static RAM) and operates at 2.7V to 5.5V supply with battery backup from 1.3V to 3.7V, matching the original part's battery voltage range. DS1337S+ offers ultra-low timekeeping current of 0.6µA at reduced voltage (1.3V to 1.8V) but lacks NVSRAM and battery backup specification. Selection depends on whether NVSRAM functionality and battery voltage compatibility are required.

Q: Why is BU9873FVT-GE2 listed if it is marked "Not For New Designs"?

A: BU9873FVT-GE2 is included for reference in applications where existing inventory must be utilized or legacy designs require continuation. For new product development, this part should be avoided in favor of active-status alternatives such as DS1308 variants or DS1337S+.

Q: Can AB-RTCMC-32.768KHZ-AIGZ-S7-T be used without PCB redesign?

A: No. AB-RTCMC-32.768KHZ-AIGZ-S7-T uses an 8-WCDFN package, which has different physical dimensions and pin layout compared to the 8-SOIC package of the 1339-31DCGI8. PCB footprint redesign is required. However, this part offers superior low-power performance (0.4µA to 0.95µA timekeeping current) and may justify redesign effort for battery-powered applications.

Q: What are the voltage compatibility constraints when selecting a substitute?

A: The 1339-31DCGI8 operates at 3.3V to 5.5V supply with 1.3V to 3.7V battery backup. Substitute parts must support overlapping voltage ranges. DS1338Z-3+T&R matches both ranges exactly. DS1337S+ covers the upper supply range (1.8V to 5.5V) but lacks battery backup specification. DS1308 variants support broader supply ranges (1.71V to 5.5V or 2.7V to 5.5V) with matching battery backup (1.3V to 5.5V). Verify that the substitute part's voltage specifications encompass your application's power supply and battery backup requirements.

Q: Does the substitute part need to support both 12-hour and 24-hour time formats?

A: The 1339-31DCGI8 supports both 12-hour and 24-hour time formats via software configuration. Most substitute parts (DS1337S+, DS1338Z-3+T&R, DS1308 variants, BU9873FVT-GE2) provide identical dual-format support. AB-RTCMC-32.768KHZ-AIGZ-S7-T supports 24-hour format only (HH:MM:SS:hh). DS1340C-18# supports 24-hour format only. Verify time format requirements before selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. All parts also maintain unlimited moisture sensitivity level (MSL 1) and REACH unaffected status, matching the original part's environmental and regulatory compliance profile.

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