DS1337S/T&R Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The DS1337S/T&R is a Real Time Clock (RTC) IC with Clock/Calendar functionality, I2C 2-Wire Serial interface, and 8-SOIC packaging manufactured by Analog Devices Inc./Maxim Integrated. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and production continuity. The DS1337S/T&R provides timekeeping with alarm capability, leap year support, and square wave output across a supply voltage range of 1.8V to 5.5V with ultra-low timekeeping current of 0.6µA.

Key Parameters

Parameter	DS1337S/T&R
Manufacturer	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Package / Case	8-SOIC (0.154", 3.90mm Width)
Voltage - Supply	1.8V ~ 5.5V
Current - Timekeeping (Max)	0.6µA @ 1.3V ~ 1.8V
Operating Temperature	-40°C ~ 85°C
Features	Alarm, Leap Year, Square Wave Output
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DS1337S/T&R is determined by the following critical parameters:

Primary Compatibility Criteria:

Interface: I2C, 2-Wire Serial (mandatory match)
Time Format: HH:MM:SS with 12/24 hour support
Date Format: YY-MM-DD-dd
Operating Temperature: -40°C ~ 85°C
Features: Alarm, Leap Year, Square Wave Output

Secondary Compatibility Criteria:

Voltage Supply Range: 1.8V ~ 5.5V (or compatible subset)
Package Type: 8-SOIC preferred for direct PCB compatibility; 8-TSSOP/8-MSOP acceptable with layout adjustment
Current Consumption: Low timekeeping current (≤1µA preferred for battery-backed applications)
RoHS Compliance: ROHS3 Compliant preferred for new designs

Substitute parts are grouped into two categories:

Category 1: Direct Pin-Compatible Substitutes (8-SOIC Package)

DS1337S+T&R (Analog Devices Inc./Maxim Integrated) — Active status, ROHS3 compliant variant
1337GDCGI8 (Renesas Electronics Corporation) — Active status, equivalent electrical specifications
1337AGDCGI8 (Renesas Electronics Corporation) — Active status, MFR recommended, improved timekeeping current (0.3µA)

Category 2: Functional Equivalents (Alternative Packages)

1339-31DVGI (Renesas Electronics Corporation) — 8-TSSOP package, includes trickle-charger feature
ISL12022MIBZ-TR5421 (Renesas Electronics Corporation) — 20-SOIC package, adds 128B SRAM
ISL12057IUZ-T (Renesas Electronics Corporation) — 8-MSOP package, ultra-low voltage operation (1.8V ~ 3.6V)
M41T11M6F (STMicroelectronics) — 8-SOIC package, adds 56B NVSRAM
M41T83SQA6F (STMicroelectronics) — 16-QFN package, adds watchdog timer and SRAM
M41T83ZQA6F (STMicroelectronics) — 16-QFN package, extended voltage range (2.38V ~ 5.5V)
M41T00AUDD1F (STMicroelectronics) — 16-DFN package, includes trickle-charger

Parameter Comparison

Part Number	Manufacturer	Status	Package	Voltage Supply	Timekeeping Current	Interface	Features	RoHS
DS1337S/T&R	Analog Devices/Maxim	Obsolete	8-SOIC	1.8V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	I2C, 2-Wire	Alarm, Leap Year, SWO	Non-compliant
DS1337S+T&R	Analog Devices/Maxim	Active	8-SOIC	1.8V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	I2C, 2-Wire	Alarm, Leap Year, SWO	ROHS3
1337GDCGI8	Renesas	Active	8-SOIC	1.8V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	I2C, 2-Wire	Alarm, Leap Year, SWO	ROHS3
1337AGDCGI8	Renesas	Active	8-SOIC	1.8V ~ 5.5V	0.3µA @ 1.3V ~ 1.8V	I2C, 2-Wire	Alarm, Leap Year, SWO	ROHS3
1339-31DVGI	Renesas	Active	8-TSSOP	3.3V ~ 5.5V	200µA @ 3.63V ~ 5.5V	I2C, 2-Wire	Alarm, Leap Year, SWO, Trickle-Charger	ROHS3
ISL12022MIBZ-TR5421	Renesas	Active	20-SOIC	2.7V ~ 5.5V	14µA ~ 15µA @ 3V ~ 5V	I2C, 2-Wire	Alarm, Daylight Savings, Leap Year, SRAM (128B)	ROHS3
ISL12057IUZ-T	Renesas	Active	8-MSOP	1.8V ~ 3.6V	0.65µA @ 1.8V	I2C, 2-Wire	Alarm, Leap Year	ROHS3
M41T11M6F	STMicroelectronics	Active	8-SOIC	2V ~ 5.5V	70µA @ 2V ~ 5.5V	I2C, 2-Wire	Leap Year, NVSRAM (56B)	ROHS3
M41T83SQA6F	STMicroelectronics	Active	16-QFN	3V ~ 5.5V	10µA @ 5.5V	I2C, 2-Wire	Alarm, Leap Year, SWO, SRAM (7B), Watchdog Timer	ROHS3
M41T83ZQA6F	STMicroelectronics	Active	16-QFN	2.38V ~ 5.5V	10µA @ 5.5V	I2C, 2-Wire	Alarm, Leap Year, SWO, SRAM (7B), Watchdog Timer	ROHS3
M41T00AUDD1F	STMicroelectronics	Active	16-DFN	3V ~ 3.6V	14.3mA @ 3V ~ 3.6V	I2C, 2-Wire	Audio, Leap Year, Trickle-Charger	ROHS3

Engineering Selection Recommendations

For Direct Replacement (No PCB Redesign):

Select DS1337S+T&R or 1337GDCGI8 for pin-for-pin compatibility in 8-SOIC packaging. Both maintain identical electrical specifications to the obsolete DS1337S/T&R while offering active product status and ROHS3 compliance. The 1337AGDCGI8 variant provides superior timekeeping current (0.3µA vs. 0.6µA), reducing battery drain in battery-backed applications without requiring design changes.

For New Designs with Layout Flexibility:

ISL12057IUZ-T is suitable for ultra-low voltage applications (1.8V ~ 3.6V) with comparable timekeeping current (0.65µA @ 1.8V) and 8-MSOP packaging. M41T11M6F offers integrated 56B NVSRAM in 8-SOIC form factor for applications requiring non-volatile user memory. M41T83SQA6F and M41T83ZQA6F provide enhanced functionality including watchdog timer and SRAM in 16-QFN packaging for systems requiring additional protection and memory.

For Battery-Backed or Extended Temperature Applications:

1339-31DVGI includes integrated trickle-charger functionality for supercapacitor or rechargeable battery backup. ISL12022MIBZ-TR5421 combines 128B SRAM with daylight savings support in 20-SOIC packaging for applications requiring extended memory and calendar features.

Compliance Considerations:

All recommended active substitutes carry ROHS3 compliance certification, meeting modern environmental and regulatory requirements. The original DS1337S/T&R is RoHS non-compliant; migration to compliant alternatives is necessary for new production and long-term supply chain sustainability.

Frequently Asked Questions (FAQ)

Q: Can DS1337S+T&R directly replace DS1337S/T&R without PCB modification?

A: Yes. DS1337S+T&R is electrically and mechanically identical to DS1337S/T&R, differing only in packaging format (Cut Tape & Digi-Reel vs. standard packaging) and RoHS compliance status. No PCB changes are required.

Q: What is the primary difference between 1337GDCGI8 and 1337AGDCGI8?

A: Both are Renesas equivalents in 8-SOIC packaging with identical voltage and interface specifications. The 1337AGDCGI8 (MFR recommended variant) provides reduced timekeeping current of 0.3µA compared to 0.6µA in 1337GDCGI8, resulting in lower battery drain for battery-backed applications.

Q: Can I use ISL12057IUZ-T as a substitute if my design operates at 5V?

A: No. ISL12057IUZ-T operates within 1.8V ~ 3.6V supply range and is not rated for 5V operation. Select alternatives with 5V compatibility such as DS1337S+T&R, 1337GDCGI8, or M41T83SQA6F.

Q: What is the advantage of M41T83SQA6F over DS1337S/T&R?

A: M41T83SQA6F adds integrated watchdog timer and 7B SRAM in 16-QFN packaging. However, it requires PCB layout redesign due to different package type and operates within 3V ~ 5.5V range (not 1.8V minimum). Select this only if watchdog timer functionality is required.

Q: Is ISL12022MIBZ-TR5421 compatible with existing DS1337S/T&R designs?

A: ISL12022MIBZ-TR5421 is functionally compatible but requires PCB redesign due to 20-SOIC packaging (larger than 8-SOIC). It is suitable for new designs requiring 128B SRAM and daylight savings support. Existing designs should use 8-SOIC alternatives.

Q: Which substitute offers the lowest timekeeping current for battery-backed operation?

A: 1337AGDCGI8 provides 0.3µA timekeeping current, the lowest among all listed substitutes. ISL12057IUZ-T offers 0.65µA at 1.8V for ultra-low voltage applications. Both are superior to the original DS1337S/T&R specification of 0.6µA.

Q: Are all recommended substitutes ROHS3 compliant?

A: Yes. All active substitute parts listed carry ROHS3 compliance certification. The original DS1337S/T&R is RoHS non-compliant. Migration to compliant alternatives is required for new production.

Q: Can M41T00AUDD1F replace DS1337S/T&R in existing designs?

A: No. M41T00AUDD1F operates within 3V ~ 3.6V range (not 1.8V minimum) and requires 16-DFN packaging redesign. Additionally, timekeeping current is significantly higher (14.3mA vs. 0.6µA). This part is suitable only for new designs with different voltage and package requirements.

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