Renesas 1337AGCSRGI8 Real Time Clock IC – Equivalent & Substitute Parts

Part Overview

The Renesas 1337AGCSRGI8 is a Real Time Clock (RTC) IC with Clock/Calendar functionality, I2C 2-Wire Serial interface, and 16-SOIC packaging. This part is classified as Obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The 1337AGCSRGI8 provides timekeeping with alarm capability, leap year support, and square wave output across a 1.8V to 5.5V supply range, operating from -40°C to 85°C.

Key Parameters

Parameter	1337AGCSRGI8
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)	0.3µA @ 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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the 1337AGCSRGI8 is determined by the following critical parameters:

Interface Compatibility: I2C, 2-Wire Serial protocol
Time/Date Format: HH:MM:SS (12/24 hr) and YY-MM-DD-dd support
Operating Temperature Range: -40°C to 85°C
Supply Voltage Range: Minimum 1.8V to 5.5V coverage
Core Features: Alarm, Leap Year, Square Wave Output capability
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category A – Direct Renesas Equivalent (Same Manufacturer)

1337AGDVGI8: Renesas equivalent with reduced pin count (8-TSSOP) and improved product status (Active)

Category B – Cross-Manufacturer Alternatives (Analog Devices/Maxim, STMicroelectronics)

DS1307ZN+, DS1308U-3+, DS1338Z-3+T&R, DS1340U-33+, DS1340U-33+T&R, DS3232SN#T&R
M41T00M6F, M41T01M6F, M41T83RQA6F

All substitute parts maintain I2C interface compatibility, support 12/24-hour time format with YY-MM-DD-dd date format, operate across -40°C to 85°C, and are ROHS3 compliant. Package variations (8-SOIC, 8-TSSOP, 16-QFN, 20-SOIC) reflect different pin counts and form factors while preserving functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Package / Case	Voltage - Supply	Current - Timekeeping (Max)	Time Format	Date Format	Interface	Features	Product Status	RoHS Status
1337AGCSRGI8	Renesas Electronics	16-SOIC (0.295", 7.50mm)	1.8V ~ 5.5V	0.3µA @ 1.3V ~ 1.8V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Alarm, Leap Year, Square Wave Output	Obsolete	ROHS3 Compliant
1337AGDVGI8	Renesas Electronics	8-TSSOP (0.118", 3.00mm)	1.8V ~ 5.5V	0.3µA @ 1.3V ~ 1.8V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Alarm, Leap Year, Square Wave Output	Active	ROHS3 Compliant
DS1307ZN+	Analog Devices Inc./Maxim	8-SOIC (0.154", 3.90mm)	4.5V ~ 5.5V	200µA @ 5V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3 Compliant
DS1308U-3+	Analog Devices Inc./Maxim	8-TSSOP (0.118", 3.00mm)	2.7V ~ 5.5V	—	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3 Compliant
DS1338Z-3+T&R	Analog Devices Inc./Maxim	8-SOIC (0.154", 3.90mm)	2.7V ~ 5.5V	200µA @ 3.3V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3 Compliant
DS1340U-33+	Analog Devices Inc./Maxim	8-TSSOP (0.118", 3.00mm)	2.97V ~ 5.5V	150µA @ 5.5V	HH:MM:SS (24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Leap Year, Trickle-Charger	Active	ROHS3 Compliant
DS1340U-33+T&R	Analog Devices Inc./Maxim	8-TSSOP (0.118", 3.00mm)	2.97V ~ 5.5V	150µA @ 5.5V	HH:MM:SS (24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Leap Year, Trickle-Charger	Active	ROHS3 Compliant
DS3232SN#T&R	Analog Devices Inc./Maxim	20-SOIC (0.295", 7.50mm)	2.3V ~ 5.5V	120µA ~ 160µA @ 3.3V ~ 5.5V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal	Active	ROHS3 Compliant
M41T00M6F	STMicroelectronics	8-SOIC (0.154", 3.90mm)	2V ~ 5.5V	70µA @ 2V ~ 5.5V	HH:MM:SS	YY-MM-DD-dd	I2C, 2-Wire Serial	Leap Year	Active	ROHS3 Compliant
M41T01M6F	STMicroelectronics	8-SOIC (0.154", 3.90mm)	2V ~ 5.5V	70µA @ 2V ~ 5.5V	HH:MM:SS	YY-MM-DD-dd	I2C, 2-Wire Serial	Leap Year	Active	ROHS3 Compliant
M41T83RQA6F	STMicroelectronics	16-VQFN Exposed Pad	2.7V ~ 5.5V	10µA @ 5.5V	HH:MM:SS:hh (24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 1337AGDVGI8 (Renesas)

The 1337AGDVGI8 is the direct Renesas equivalent with Active product status. It maintains identical electrical specifications (1.8V ~ 5.5V supply, 0.3µA timekeeping current, 12/24-hour format, YY-MM-DD-dd date format) and identical feature set (Alarm, Leap Year, Square Wave Output). The only difference is package form factor (8-TSSOP vs. 16-SOIC), which requires PCB layout modification. This part is ROHS3 compliant with MSL 3 rating and is recommended for designs where package footprint can be accommodated.

Secondary Recommendation: DS3232SN#T&R (Analog Devices/Maxim)

The DS3232SN#T&R maintains the 16-SOIC package footprint of the original part, enabling direct PCB compatibility without layout redesign. It supports I2C interface, 12/24-hour time format, YY-MM-DD-dd date format, and operates across -40°C to 85°C. Supply voltage range is 2.3V ~ 5.5V (broader than the original 1.8V minimum). Features include Alarm, Leap Year, Square Wave Output, plus additional SRAM and TCXO/Crystal support. Product status is Active with ROHS3 compliance and MSL 1 rating. Current consumption is higher (120µA ~ 160µA @ 3.3V ~ 5.5V) compared to the original 0.3µA, which may impact battery-backed applications.

Tertiary Recommendation: DS1338Z-3+T&R (Analog Devices/Maxim)

The DS1338Z-3+T&R offers 8-SOIC packaging with Active product status and ROHS3 compliance. Supply voltage range is 2.7V ~ 5.5V. Features include Leap Year, NVSRAM, and Square Wave Output. Time format is HH:MM:SS (12/24 hr) with YY-MM-DD-dd date format. Current consumption is 200µA @ 3.3V. This part is suitable for applications where package size reduction is acceptable and NVSRAM functionality is beneficial.

Alternative Consideration: M41T83RQA6F (STMicroelectronics)

The M41T83RQA6F provides the lowest timekeeping current (10µA @ 5.5V) among all substitutes, making it optimal for ultra-low-power battery-backed designs. It features 16-VQFN packaging with Alarm, Leap Year, Square Wave Output, SRAM, and Watchdog Timer. Supply voltage is 2.7V ~ 5.5V. Product status is Active with ROHS3 compliance and MSL 1 rating. Time format is HH:MM:SS:hh (24 hr only, not 12 hr). This part requires PCB layout modification due to different package form factor.

All recommended substitutes are ROHS3 compliant and operate across the -40°C to 85°C temperature range specified for the original part.

Frequently Asked Questions (FAQ)

Q: Can I use the 1337AGDVGI8 as a direct replacement without PCB modification?

A: The 1337AGDVGI8 is electrically equivalent but uses 8-TSSOP packaging instead of 16-SOIC. PCB layout modification is required to accommodate the different pin count and footprint. Verify pinout compatibility and signal routing before implementation.

Q: What is the key difference between the DS1307ZN+ and DS1338Z-3+T&R?

A: Both support I2C interface, 12/24-hour time format, and YY-MM-DD-dd date format. The DS1307ZN+ has a narrower supply voltage range (4.5V ~ 5.5V) and higher timekeeping current (200µA @ 5V). The DS1338Z-3+T&R supports a broader supply range (2.7V ~ 5.5V) and includes NVSRAM. Choose DS1338Z-3+T&R for applications requiring lower supply voltage operation.

Q: Why does the DS1340U-33+ show only 24-hour time format instead of 12/24 hour?

A: The DS1340U-33+ is designed for 24-hour operation only. If your application requires 12-hour format support, select DS1338Z-3+T&R, DS3232SN#T&R, or 1337AGDVGI8, which all support both 12 and 24-hour modes.

Q: Is the DS3232SN#T&R suitable for battery-backed timekeeping applications?

A: The DS3232SN#T&R supports battery backup operation with supply voltage range 2.3V ~ 5.5V. However, timekeeping current is 120µA ~ 160µA @ 3.3V ~ 5.5V, which is significantly higher than the original 1337AGCSRGI8 (0.3µA). For extended battery life, consider M41T83RQA6F (10µA @ 5.5V) or M41T00M6F (70µA @ 2V ~ 5.5V).

Q: Can I use M41T00M6F or M41T01M6F in place of the 1337AGCSRGI8?

A: Both M41T00M6F and M41T01M6F support I2C interface, YY-MM-DD-dd date format, and -40°C to 85°C operation. However, they do not explicitly support 12-hour time format (listed as HH:MM:SS only) and lack Alarm and Square Wave Output features. Use these parts only if your application does not require these specific features.

Q: What is the significance of MSL (Moisture Sensitivity Level) rating?

A: The original 1337AGCSRGI8 has MSL 3 (168 Hours), requiring controlled storage and handling. Most substitute parts have MSL 1 (Unlimited), allowing standard storage conditions without time-limited exposure requirements. This simplifies supply chain management and reduces handling costs.

Q: Which substitute part offers the best feature parity with the original 1337AGCSRGI8?

A: The 1337AGDVGI8 (Renesas) and DS3232SN#T&R (Analog Devices/Maxim) offer the closest feature match. Both support Alarm, Leap Year, and Square Wave Output with 12/24-hour time format and YY-MM-DD-dd date format. The 1337AGDVGI8 maintains identical electrical specifications; DS3232SN#T&R maintains the 16-SOIC package footprint.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all substitute parts listed are ROHS3 compliant and suitable for applications requiring RoHS compliance certification.

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