Equivalent & Substitute Parts for 1339-2DCGI

Part Overview

The 1339-2DCGI is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Renesas Electronics Corporation. This device operates via I2C 2-Wire Serial interface in an 8-SOIC surface mount package and includes features such as alarm capability, leap year support, square wave output, and trickle-charger functionality. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support, maintenance, and new design implementations where legacy compatibility is required or where active alternatives offer improved availability and performance characteristics.

Key Parameters

Parameter	Value
Manufacturer Part Number	1339-2DCGI
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply	2V ~ 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
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 1339-2DCGI is determined by the following critical parameters:

Primary Compatibility Criteria:

Interface: I2C, 2-Wire Serial (mandatory match)
Package / Case: 8-SOIC (0.154", 3.90mm Width) (mandatory match for direct PCB compatibility)
Mounting Type: Surface Mount (mandatory match)
Operating Temperature: -40°C ~ 85°C (mandatory match)
Time Format: HH:MM:SS with 12/24 hour support (mandatory match)
Date Format: YY-MM-DD-dd (mandatory match)

Secondary Compatibility Criteria:

Voltage - Supply range must encompass or overlap with 2V ~ 5.5V
Voltage - Supply, Battery range must encompass or overlap with 1.3V ~ 3.7V
Current - Timekeeping specifications must be compatible with system power budget
Features: Alarm, Leap Year, and Trickle-Charger support required for full functional equivalence

Substitute parts are grouped into two categories:

Category A - Direct Package Equivalents (8-SOIC): Parts maintaining identical 8-SOIC packaging for direct PCB replacement without layout modifications.

Category B - Functional Equivalents (Alternative Packages): Parts providing equivalent RTC functionality with I2C interface but in different packages, requiring PCB redesign or adapter solutions.

Parameter Comparison

Parameter	1339-2DCGI	DS1340Z-3+	DS1340Z-33+	DS1340Z-18+	ISL12008IB8Z-T	DS1339BU+T	DS1337U+
Manufacturer	Renesas	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Renesas	Analog Devices/Maxim	Analog Devices/Maxim
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-TSSOP/8-MSOP	8-TSSOP/8-MSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Interface	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire
Voltage - Supply	2V ~ 5.5V	2.7V ~ 5.5V	2.97V ~ 5.5V	1.71V ~ 5.5V	2.7V ~ 5.5V	1.71V ~ 5.5V	1.8V ~ 5.5V
Voltage - Supply, Battery	1.3V ~ 3.7V	1.3V ~ 3.7V	1.3V ~ 5.5V	1.3V ~ 3.7V	1.8V ~ 5.5V	1.3V ~ 3.7V	—
Current - Timekeeping (Max)	200µA @ 3.63V ~ 5.5V	125µA @ 3.3V	150µA @ 5.5V	100µA @ 1.89V	4µA ~ 6µA @ 3V ~ 5V	200µA @ 1.71V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V
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
Time Format	HH:MM:SS (12/24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (24 hr)	HH:MM:SS:hh (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	YY-MM-DD-dd
Features	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Leap Year, Trickle-Charger	Leap Year, Trickle-Charger	Leap Year, Trickle-Charger	Alarm, Leap Year	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Alarm, Leap Year, Square Wave Output
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Package Replacement (8-SOIC, No PCB Modification Required):

For applications requiring identical form factor and pinout compatibility, the following active alternatives are available:

DS1340Z-3+ and DS1340Z-33+ maintain 8-SOIC packaging with I2C interface and operating temperature range matching the 1339-2DCGI. DS1340Z-3+ operates at 2.7V ~ 5.5V supply voltage with 125µA timekeeping current at 3.3V. DS1340Z-33+ operates at 2.97V ~ 5.5V with 150µA timekeeping current at 5.5V. Both support leap year and trickle-charger features. Time format is limited to 24-hour operation, differing from the 1339-2DCGI's 12/24-hour capability. These parts are in active production with ROHS3 compliance.

DS1340Z-18+ provides the lowest supply voltage floor at 1.71V ~ 5.5V with 100µA timekeeping current at 1.89V, offering improved low-power operation. Like other DS1340 variants, it lacks 12-hour time format support and square wave output features.

ISL12008IB8Z-T is a Renesas alternative maintaining 8-SOIC packaging with superior timekeeping current specifications (4µA ~ 6µA @ 3V ~ 5V), representing significant power efficiency improvement. It supports alarm and leap year features but lacks square wave output and trickle-charger functionality. Battery supply range extends to 5.5V. This part is in active production with ROHS3 compliance.

Alternative Package Solutions (Functional Equivalence, PCB Redesign Required):

DS1339BU+T in 8-TSSOP/8-MSOP package provides complete feature parity with the 1339-2DCGI, including alarm, leap year, square wave output, and trickle-charger support. It maintains 12/24-hour time format and identical operating temperature range. Supply voltage operates at 1.71V ~ 5.5V with 200µA timekeeping current, matching the original part's power characteristics. This part is in active production with ROHS3 compliance and available in Tape & Reel packaging.

DS1337U+ in 8-TSSOP/8-MSOP package supports alarm, leap year, and square wave output features with 12/24-hour time format. Supply voltage range is 1.8V ~ 5.5V with significantly reduced timekeeping current of 0.6µA @ 1.3V ~ 1.8V, providing superior power efficiency. This part lacks trickle-charger functionality and battery supply specification. It is in active production with ROHS3 compliance and high inventory availability (20,100 units).

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original 1339-2DCGI specification.

Frequently Asked Questions (FAQ)

Q: Can DS1340Z-3+ directly replace 1339-2DCGI without PCB modification?

A: Yes. Both parts use 8-SOIC packaging with identical pinout and I2C interface. However, the DS1340Z-3+ operates in 24-hour time format only, whereas the 1339-2DCGI supports both 12-hour and 24-hour formats. Verify that your firmware or application does not require 12-hour time format operation before substitution.

Q: What is the primary advantage of ISL12008IB8Z-T over DS1340 variants?

A: ISL12008IB8Z-T provides significantly lower timekeeping current consumption (4µA ~ 6µA @ 3V ~ 5V) compared to DS1340 variants (100µA ~ 150µA), resulting in extended battery life for battery-backed RTC applications. It maintains 8-SOIC packaging for direct PCB replacement.

Q: Why does DS1337U+ show lower timekeeping current than other substitutes?

A: DS1337U+ achieves 0.6µA @ 1.3V ~ 1.8V through advanced low-power design. This specification applies only at the lower voltage range. At higher supply voltages (3.3V ~ 5.5V), actual timekeeping current will be higher. Consult the DS1337U+ datasheet for current specifications at your operating voltage.

Q: Is DS1339BU+T a complete functional equivalent to 1339-2DCGI?

A: Yes. DS1339BU+T provides complete feature parity including alarm, leap year, square wave output, trickle-charger, and 12/24-hour time format support. The only difference is packaging: DS1339BU+T uses 8-TSSOP/8-MSOP instead of 8-SOIC, requiring PCB redesign. Supply voltage and timekeeping current specifications are identical.

Q: Can I use DS1337U+ as a drop-in replacement?

A: DS1337U+ requires PCB redesign due to different packaging (8-TSSOP/8-MSOP vs. 8-SOIC). Additionally, it lacks trickle-charger functionality and does not specify battery supply voltage range. It is suitable only for applications that do not require these features.

Q: What are the compliance certifications for all substitute parts?

A: All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original 1339-2DCGI. All parts are classified under ECCN EAR99 and HTSUS 8542.39.0001.

Q: Which substitute offers the best balance of compatibility and availability?

A: DS1340Z-3+ provides the closest compatibility with 8-SOIC packaging, I2C interface, and active production status. It has 7,465 units in stock. For applications not requiring 12-hour time format, this part is the recommended direct replacement. For applications requiring complete feature parity, DS1339BU+T is recommended despite requiring PCB redesign.

Q: Are there supply voltage compatibility concerns with any substitute?

A: DS1340Z-33+ has a minimum supply voltage of 2.97V, which may not be compatible with systems designed for 2V minimum operation. DS1340Z-3+ and DS1340Z-18+ support lower minimum voltages (2.7V and 1.71V respectively). Verify your system's minimum supply voltage before selection.

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