Equivalent & Substitute Parts for 1337GDCGI

Part Overview

The 1337GDCGI 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 and is packaged in 8-SOIC (0.154", 3.90mm Width) surface mount configuration. The part is currently listed as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The 1337GDCGI provides timekeeping with alarm capability, leap year support, and square wave output. It operates across a supply voltage range of 1.8V to 5.5V with minimal timekeeping current consumption of 0.6µA at 1.3V to 1.8V. Operating temperature range spans -40°C to 85°C.

Key Parameters

Parameter	Value
Manufacturer Part Number	1337GDCGI
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Product Type	Real Time Clock (RTC) Clock/Calendar
Interface	I2C, 2-Wire Serial
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply	1.8V ~ 5.5V
Current - Timekeeping (Max)	0.6µA @ 1.3V ~ 1.8V
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
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution for the 1337GDCGI is determined by the following critical parameters:

Primary Substitution Criteria:

Interface: I2C, 2-Wire Serial (mandatory match)
Time Format: HH:MM:SS (12/24 hr) capability
Date Format: YY-MM-DD-dd capability
Features: Alarm, Leap Year, Square Wave Output
Operating Temperature: -40°C ~ 85°C
Voltage - Supply: 1.8V ~ 5.5V (or compatible range)
Mounting Type: Surface Mount
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Substitution Criteria:

Package compatibility (8-SOIC preferred; alternative packages acceptable with PCB redesign)
Current consumption (lower or equal preferred)
Product Status (Active preferred over Obsolete or Not For New Designs)
RoHS/REACH compliance

Substitute parts are grouped into two categories:

Category A - Direct Substitutes (Same Package, Full Feature Match):

1337AGDCGI (Renesas, Active status, improved current consumption)
DS1337S+ and DS1337S+T&R (Analog Devices/Maxim, Active status, same electrical specifications)

Category B - Functional Equivalents (Alternative Packages, Feature Match):

DS1337U+ (8-TSSOP/8-MSOP package, same electrical specifications)
BU9873FVT-GE2 (Rohm, 8-TSSOP package, Not For New Designs status)
AB-RTCMC-32.768KHZ-AIGZ-S7-T (Abracon, 8-WCDFN package, module form)
AB-RTCMC-32.768KHZ-B5ZE-S3-T (Abracon, 10-SMD Module package)

Category C - Extended Compatibility (Different Feature Sets):

DS1307+ (Through Hole 8-DIP, includes NVSRAM, different voltage requirements)
DS1308U-33+ (8-TSSOP/8-MSOP, includes NVSRAM, different voltage requirements)
DS1338C-3# (16-SOIC, includes NVSRAM, different voltage requirements)

Parameter Comparison

Parameter	1337GDCGI	1337AGDCGI	DS1337S+	DS1337S+T&R	DS1337U+	BU9873FVT-GE2
Manufacturer	Renesas	Renesas	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Rohm
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
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-TSSOP/8-MSOP	8-TSSOP
Voltage - Supply	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V
Current - Timekeeping (Max)	0.6µA @ 1.3V ~ 1.8V	0.3µA @ 1.3V ~ 1.8V	0.6µA @ 1.3V ~ 1.8V	0.6µA @ 1.3V ~ 1.8V	0.6µA @ 1.3V ~ 1.8V	1µA ~ 1.35µA @ 3V ~ 5.5V
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
Time Format	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)
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, Square Wave Output	Alarm, Leap Year, Square Wave Output	Alarm, Leap Year, Square Wave Output	Alarm, Leap Year, Square Wave Output	Alarm, Leap Year, Square Wave Output	Alarm, Leap Year
Product Status	Obsolete	Active	Active	Active	Active	Not For New Designs
RoHS Status	REACH Unaffected	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 Direct Replacement (No PCB Redesign Required):

Select 1337AGDCGI when available. This part maintains identical package (8-SOIC), interface (I2C 2-Wire Serial), and feature set while offering improved timekeeping current consumption (0.3µA versus 0.6µA). Product status is Active with ROHS3 compliance, providing long-term availability and regulatory alignment.

Select DS1337S+ or DS1337S+T&R as secondary options. Both maintain identical electrical specifications and package compatibility with the original 1337GDCGI. DS1337S+T&R offers higher inventory availability (100,100 pcs) in Cut Tape & Digi-Reel packaging. Both carry Active product status and ROHS3 compliance.

For Package-Compatible Substitution (Minimal PCB Redesign):

Select DS1337U+ when 8-SOIC package is unavailable. This part uses 8-TSSOP/8-MSOP package (0.118", 3.00mm Width) with identical electrical specifications and feature set. Active product status and ROHS3 compliance ensure long-term support. Footprint redesign is required but electrical integration remains unchanged.

For Extended Compatibility Applications:

BU9873FVT-GE2 (Rohm) provides functional equivalence in 8-TSSOP package. Note product status is Not For New Designs; use only for legacy system maintenance or when other options are unavailable. Current consumption is higher (1µA to 1.35µA) compared to the original specification.

Compliance and Regulatory Considerations:

All recommended Active status substitutes (1337AGDCGI, DS1337S+, DS1337S+T&R, DS1337U+) carry ROHS3 compliance and REACH Unaffected status, matching the regulatory profile of the original 1337GDCGI. MSL rating of 1 (Unlimited) is consistent across all substitutes, eliminating moisture sensitivity concerns during handling and storage.

Frequently Asked Questions (FAQ)

Q: Can I use DS1337U+ as a direct replacement for 1337GDCGI without PCB changes?

A: No. DS1337U+ uses 8-TSSOP/8-MSOP package (0.118", 3.00mm Width) versus the original 8-SOIC (0.154", 3.90mm Width). Electrical specifications and functionality are identical, but PCB footprint redesign is required. If package compatibility is critical, use 1337AGDCGI or DS1337S+ instead.

Q: What is the difference between DS1337S+ and DS1337S+T&R?

A: Both parts are electrically identical with matching specifications. The difference is packaging format: DS1337S+ is supplied in Tube packaging, while DS1337S+T&R is supplied in Cut Tape (CT) & Digi-Reel format. DS1337S+T&R offers significantly higher inventory availability (100,100 pcs versus 1,990 pcs). Select based on procurement and assembly requirements.

Q: Why is 1337AGDCGI preferred over the original 1337GDCGI?

A: 1337AGDCGI is the direct successor with identical package and interface. It offers improved timekeeping current consumption (0.3µA versus 0.6µA), reducing power draw by 50%. Product status is Active versus Obsolete, ensuring long-term availability and manufacturing support. All other electrical and functional parameters remain equivalent.

Q: Can I use BU9873FVT-GE2 for new designs?

A: BU9873FVT-GE2 carries product status Not For New Designs. Use this part only for legacy system maintenance or replacement applications. For new designs, select from Active status alternatives: 1337AGDCGI, DS1337S+, DS1337S+T&R, or DS1337U+.

Q: Are all substitute parts RoHS compliant?

A: All recommended Active status substitutes (1337AGDCGI, DS1337S+, DS1337S+T&R, DS1337U+) carry ROHS3 compliance. BU9873FVT-GE2 also carries ROHS3 compliance despite Not For New Designs status. The original 1337GDCGI is REACH Unaffected; all substitutes maintain equivalent or improved regulatory compliance.

Q: What is the impact of higher current consumption in BU9873FVT-GE2?

A: BU9873FVT-GE2 timekeeping current is 1µA to 1.35µA at 3V to 5.5V, compared to 0.6µA for the original 1337GDCGI at 1.3V to 1.8V. This represents approximately 2x higher current draw. For battery-backed timekeeping applications, this increases power consumption and reduces battery life. Select lower-current alternatives (1337AGDCGI, DS1337S+, DS1337U+) for power-sensitive designs.

Q: Do all substitutes support the same I2C interface and protocol?

A: Yes. All substitute parts listed use I2C 2-Wire Serial interface with identical time format (HH:MM:SS 12/24 hr) and date format (YY-MM-DD-dd). Firmware and software integration remains unchanged. Pin-level compatibility varies by package; refer to individual datasheets for pinout verification.

Q: What is the Moisture Sensitivity Level (MSL) for all parts?

A: All parts, including the original 1337GDCGI and all substitutes, carry MSL rating of 1 (Unlimited). This indicates no moisture sensitivity restrictions during storage, handling, or assembly. Standard PCB assembly processes are applicable without special moisture control measures.

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