Equivalent & Substitute Parts for 1337GCSRI

Part Overview

The 1337GCSRI is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Renesas Electronics Corporation. This device features I2C (2-Wire Serial) interface, alarm capability, leap year support, and square wave output in a 16-SOIC package. The part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility through matching electrical specifications, interface protocols, and package form factors.

Key Parameters

Parameter	1337GCSRI Specification
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Package / Case	16-SOIC (0.295", 7.50mm Width)
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
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the 1337GCSRI are evaluated based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Interface Protocol: I2C, 2-Wire Serial (mandatory match)
Time/Date Format: HH:MM:SS (12/24 hr) and YY-MM-DD-dd (mandatory match)
Operating Temperature Range: -40°C ~ 85°C (mandatory match)
Supply Voltage Range: Must encompass or overlap with 1.8V ~ 5.5V
Package Type: 16-SOIC form factor preferred for direct PCB compatibility
Features: Alarm, Leap Year, Square Wave Output (functional requirements)

Substitution Categories:

Category A - Direct Package Equivalents (16-SOIC): Parts maintaining identical 16-SOIC packaging with matching electrical and functional specifications. These provide pin-compatible replacements with minimal design modification.

Category B - Functional Equivalents (Alternative Packages): Parts with matching I2C interface, time/date formats, and operating temperature but in different package types (8-SOIC, 8-DIP, 8-TDFN, 8-WCDFN). These require PCB layout redesign but maintain full functional compatibility.

Category C - Enhanced Feature Variants: Parts with additional features (NVSRAM, Trickle-Charger, Watchdog Timer) while maintaining core RTC functionality and I2C interface.

Parameter Comparison

Part Number	Manufacturer	Package / Case	Voltage - Supply	Current - Timekeeping (Max)	Operating Temperature	Interface	Time Format	Date Format	Features	Product Status	RoHS Status
1337GCSRI	Renesas Electronics	16-SOIC (0.295", 7.50mm)	1.8V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output	Obsolete	RoHS non-compliant
DS1337C#	Analog Devices Inc./Maxim Integrated	16-SOIC (0.295", 7.50mm)	1.8V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output	Active	ROHS3 Compliant
DS1337C#T&R	Analog Devices Inc./Maxim Integrated	16-SOIC (0.295", 7.50mm)	1.8V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output	Active	ROHS3 Compliant
DS1340C-18#	Analog Devices Inc./Maxim Integrated	16-SOIC (0.295", 7.50mm)	1.71V ~ 5.5V	100µA @ 1.89V	-40°C ~ 85°C	I2C, 2-Wire Serial	HH:MM:SS (24 hr)	YY-MM-DD-dd	Leap Year, Trickle-Charger	Active	ROHS3 Compliant
DS1338Z-3+	Analog Devices Inc./Maxim Integrated	8-SOIC (0.154", 3.90mm)	2.7V ~ 5.5V	200µA @ 3.3V	-40°C ~ 85°C	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3 Compliant
DS1307N+	Analog Devices Inc./Maxim Integrated	8-DIP (0.300", 7.62mm)	4.5V ~ 5.5V	200µA @ 5V	-40°C ~ 85°C	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3 Compliant
DS1339AD+T	Analog Devices Inc./Maxim Integrated	8-TDFN EP	1.71V ~ 5.5V	200µA @ 1.71V ~ 5.5V	-40°C ~ 85°C	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Active	ROHS3 Compliant
DS1339AU+	Analog Devices Inc./Maxim Integrated	8-TSSOP, 8-MSOP (0.118", 3.00mm)	1.71V ~ 5.5V	200µA @ 1.71V ~ 5.5V	-40°C ~ 85°C	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Active	ROHS3 Compliant
DS1339U-3+T&R	Analog Devices Inc./Maxim Integrated	8-TSSOP, 8-MSOP (0.118", 3.00mm)	2.7V ~ 5.5V	150µA @ 3.3V	-40°C ~ 85°C	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Active	ROHS3 Compliant
DS1339U-33+	Analog Devices Inc./Maxim Integrated	8-TSSOP, 8-MSOP (0.118", 3.00mm)	2.97V ~ 5.5V	200µA @ 5.5V	-40°C ~ 85°C	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Active	ROHS3 Compliant
AB-RTCMC-32.768KHZ-AIGZ-S7-T	Abracon LLC	8-WCDFN (3.2x1.5)	1V ~ 4.4V	0.4µA ~ 0.95µA @ 1V ~ 4.4V	-40°C ~ 85°C	I2C, 2-Wire Serial	HH:MM:SS:hh (24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Watchdog Timer	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Package Replacement (Recommended for Existing PCB Designs):

DS1337C# and DS1337C#T&R are pin-compatible direct replacements for the 1337GCSRI. Both parts maintain identical 16-SOIC packaging, electrical specifications (1.8V ~ 5.5V supply, 0.6µA timekeeping current), and functional features (Alarm, Leap Year, Square Wave Output). The primary advantage is that these parts are manufactured by Analog Devices Inc./Maxim Integrated with Active product status and ROHS3 compliance, addressing the obsolescence and RoHS non-compliance issues of the original part. DS1337C# is available in Tube packaging, while DS1337C#T&R is supplied in Cut Tape & Digi-Reel format for automated assembly.

Alternative Package Options (For New Designs):

DS1340C-18# maintains the 16-SOIC package with Active status and ROHS3 compliance. This part operates across 1.71V ~ 5.5V and includes Trickle-Charger functionality. The time format is 24-hour only (versus 12/24-hour on the original), and timekeeping current is 100µA at 1.89V. This represents a functional equivalent with enhanced features suitable for designs requiring battery backup charging capability.

DS1338Z-3+ provides I2C interface compatibility in an 8-SOIC package with NVSRAM (Non-Volatile Static RAM) and maintains 12/24-hour time format. Supply voltage range is 2.7V ~ 5.5V. This option requires PCB redesign due to package change but offers reduced board footprint and integrated non-volatile memory.

DS1307N+ is a through-hole 8-DIP package option with NVSRAM and 56B memory. Supply voltage is limited to 4.5V ~ 5.5V with battery backup at 2V ~ 4.6V. This part is suitable for legacy designs or applications requiring through-hole mounting.

Compact Package Alternatives (DS1339 Series):

DS1339AD+T, DS1339AU+, DS1339U-3+T&R, and DS1339U-33+ are available in 8-TDFN and 8-TSSOP packages with Trickle-Charger and Alarm features. These parts support the full 1.71V ~ 5.5V supply range (with voltage-specific variants) and maintain I2C interface compatibility. All are ROHS3 compliant with Active status. These options are suitable for space-constrained designs.

Ultra-Low Power Option:

AB-RTCMC-32.768KHZ-AIGZ-S7-T from Abracon LLC offers the lowest timekeeping current (0.4µA ~ 0.95µA) across its 1V ~ 4.4V supply range. This part includes Watchdog Timer functionality and is supplied in 8-WCDFN package. The 24-hour time format (without 12-hour option) and different package require design evaluation. This option is optimal for battery-powered applications prioritizing minimal power consumption.

Compliance Considerations:

All recommended substitute parts carry ROHS3 compliance and Active product status, eliminating the obsolescence risk and environmental compliance issues associated with the 1337GCSRI. Inventory availability ranges from 737 to 84,205 units across the substitute options, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can DS1337C# be used as a direct replacement for 1337GCSRI without PCB modification?

A: Yes. DS1337C# and DS1337C#T&R are pin-compatible equivalents with identical 16-SOIC packaging, supply voltage range (1.8V ~ 5.5V), timekeeping current (0.6µA), and functional features. No PCB layout changes are required. The primary differences are manufacturer (Analog Devices/Maxim vs. Renesas), product status (Active vs. Obsolete), and RoHS compliance (ROHS3 vs. non-compliant).

Q: What are the key differences between DS1337C# and DS1340C-18#?

A: Both maintain 16-SOIC packaging and I2C interface. DS1337C# supports 12/24-hour time format with 0.6µA timekeeping current. DS1340C-18# operates in 24-hour format only with 100µA timekeeping current but includes Trickle-Charger functionality. DS1340C-18# has a slightly lower minimum supply voltage (1.71V vs. 1.8V). Choose DS1337C# for direct compatibility; select DS1340C-18# if battery backup charging is required.

Q: Why do some substitute parts have higher timekeeping current than the original 1337GCSRI?

A: Timekeeping current varies by device architecture and feature set. DS1307N+, DS1338Z-3+, and DS1339 series parts specify 150µA to 200µA timekeeping current due to integrated NVSRAM or additional features like Trickle-Charger. For applications requiring ultra-low power, the AB-RTCMC-32.768KHZ-AIGZ-S7-T (0.4µA ~ 0.95µA) is the optimal choice, though it requires package redesign.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are ROHS3 compliant. The original 1337GCSRI is RoHS non-compliant. This compliance upgrade is a key advantage of migration to any of the recommended substitutes.

Q: Which substitute part is best for a new design with space constraints?

A: DS1338Z-3+ (8-SOIC), DS1339 series (8-TSSOP/8-TDFN), or AB-RTCMC-32.768KHZ-AIGZ-S7-T (8-WCDFN) offer the smallest packages. DS1338Z-3+ provides the best balance of compact size, integrated NVSRAM, and 12/24-hour time format support. AB-RTCMC-32.768KHZ-AIGZ-S7-T is optimal if ultra-low power consumption is the primary constraint.

Q: What is the difference between DS1339AU+ and DS1339U-3+T&R packaging?

A: Both use 8-TSSOP/8-MSOP packages with identical electrical specifications. DS1339AU+ is supplied in Tube packaging for manual assembly. DS1339U-3+T&R is supplied in Tape & Reel (Cut Tape) format optimized for automated pick-and-place assembly. Select based on assembly process requirements.

Q: Can I use DS1307N+ (8-DIP through-hole) as a substitute for the surface-mount 1337GCSRI?

A: DS1307N+ is functionally compatible via I2C interface and supports 12/24-hour time format. However, it is a through-hole component requiring different PCB footprint and assembly process. Supply voltage is limited to 4.5V ~ 5.5V (narrower than 1337GCSRI's 1.8V ~ 5.5V). Use this option only if through-hole mounting is required for your application.

Q: Does the AB-RTCMC-32.768KHZ-AIGZ-S7-T include the 32.768 kHz oscillator?

A: The part number indicates integrated 32.768 kHz oscillator functionality. This is a complete RTC solution in 8-WCDFN package. Verify oscillator specifications against your application requirements before selection.

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