DS3231S/T&R Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The DS3231S/T&R is a Real Time Clock (RTC) IC with integrated clock/calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This 16-SOIC surface mount device operates across a 2.3V to 5.5V supply range and provides I2C/2-Wire Serial interface for time and date management with alarm, leap year, and square wave output capabilities.

The DS3231S/T&R is classified as Obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for applications requiring RTC functionality with comparable electrical and mechanical specifications.

Key Parameters

Parameter	DS3231S/T&R
Manufacturer	Analog Devices Inc./Maxim Integrated
Package / Case	16-SOIC (0.295", 7.50mm Width)
Interface	I2C, 2-Wire Serial
Voltage - Supply	2.3V ~ 5.5V
Voltage - Supply, Battery	2.3V ~ 5.5V
Current - Timekeeping (Max)	110µA ~ 170µA @ 3.63V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Features	Alarm, Leap Year, Square Wave Output, TCXO/Crystal
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the DS3231S/T&R are selected based on the following critical parameters that determine functional and mechanical compatibility:

Primary Substitution Criteria:

I2C/2-Wire Serial interface compatibility
Supply voltage range overlap (minimum 2.3V ~ 5.5V or compatible subset)
Time format support (HH:MM:SS with 12/24 hour capability)
Date format support (YY-MM-DD-dd)
Surface mount technology
RoHS3 compliance
Active or equivalent product status

Secondary Compatibility Factors:

Package form factor (16-SOIC preferred; alternative packages acceptable if electrical specifications align)
Alarm and leap year functionality
Operating temperature range (0°C ~ 70°C minimum)
Current consumption in timekeeping mode

Substitutes are grouped into two categories: direct equivalents (DS3231S#T&R) and functional alternatives that meet core RTC requirements with differing package configurations or enhanced feature sets.

Parameter Comparison

Part Number	Manufacturer	Package	Interface	Supply Voltage	Timekeeping Current	Operating Temp	Time Format	Features	Product Status
DS3231S/T&R	Analog Devices Inc./Maxim Integrated	16-SOIC (0.295", 7.50mm)	I2C, 2-Wire Serial	2.3V ~ 5.5V	110µA ~ 170µA @ 3.63V ~ 5.5V	0°C ~ 70°C	HH:MM:SS (12/24 hr)	Alarm, Leap Year, Square Wave Output, TCXO/Crystal	Obsolete
DS3231S#T&R	Analog Devices Inc./Maxim Integrated	16-SOIC (0.295", 7.50mm)	I2C, 2-Wire Serial	2.3V ~ 5.5V	110µA ~ 170µA @ 3.63V ~ 5.5V	0°C ~ 70°C	HH:MM:SS (12/24 hr)	Alarm, Leap Year, Square Wave Output, TCXO/Crystal	Active
1337DVGI	Renesas Electronics Corporation	8-TSSOP, 8-MSOP (0.118", 3.00mm)	I2C, 2-Wire Serial	1.8V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	Alarm, Leap Year, Square Wave Output	Active
AB-RTCMC-32.768KHZ-AIGZ-S7-T	Abracon LLC	8-WCDFN	I2C, 2-Wire Serial	1V ~ 4.4V	0.4µA ~ 0.95µA @ 1V ~ 4.4V	-40°C ~ 85°C	HH:MM:SS:hh (24 hr)	Alarm, Leap Year, Watchdog Timer	Active
AB-RTCMC-32.768KHZ-IBO5-S3-T	Abracon LLC	Module	I2C, 2-Wire Serial	1.5V ~ 3.6V	0.29µA ~ 0.33µA @ 1.8V ~ 3V	-40°C ~ 85°C	HH:MM:SS:hh (24 hr)	Alarm, Square Wave Output, SRAM, Trickle Charge, Watchdog Timer	Not For New Designs
BQ32002D	Texas Instruments	8-SOIC (0.154", 3.90mm)	I2C, 2-Wire Serial	3V ~ 3.6V	200µA @ 3.3V	-40°C ~ 85°C	HH:MM:SS (24 hr)	Leap Year, Square Wave Output, Trickle-Charger	Active
ISL12020MIRZ	Renesas Electronics Corporation	20-PowerLFDFN	I2C, 2-Wire Serial	2.7V ~ 5.5V	14µA ~ 15µA @ 3V ~ 5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	Alarm, Daylight Savings, Leap Year, SRAM	Active
ISL12022MIBZ-TR5421	Renesas Electronics Corporation	20-SOIC (0.295", 7.50mm)	I2C, 2-Wire Serial	2.7V ~ 5.5V	14µA ~ 15µA @ 3V ~ 5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	Alarm, Daylight Savings, Leap Year, SRAM	Active
ISL1208IB8Z	Renesas Electronics Corporation	8-SOIC (0.154", 3.90mm)	I2C, 2-Wire Serial	2.7V ~ 5.5V	4µA ~ 6µA @ 3V ~ 5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	Alarm, Leap Year, SRAM	Active
ISL1208IU8Z-T7A	Renesas Electronics Corporation	8-TSSOP, 8-MSOP (0.118", 3.00mm)	I2C, 2-Wire Serial	2.7V ~ 5.5V	4µA ~ 6µA @ 3V ~ 5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	Alarm, Leap Year, SRAM	Active
M41T00SM6F	STMicroelectronics	8-SOIC (0.154", 3.90mm)	I2C, 2-Wire Serial	2.7V ~ 5.5V	70µA @ 2.7V ~ 5.5V	-40°C ~ 85°C	HH:MM:SS (24 hr)	Leap Year	Active

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

DS3231S#T&R is the direct equivalent to DS3231S/T&R, offering identical electrical specifications, package configuration, and feature set. This part maintains Active product status and is available in Cut Tape and Digi-Reel packaging. Selection of DS3231S#T&R eliminates design modification requirements and ensures pin-for-pin compatibility.

Active Alternatives for Extended Temperature Range:

ISL12022MIBZ-TR5421 and ISL12020MIRZ provide functional RTC equivalence with extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C). Both parts maintain I2C interface compatibility, support 12/24-hour time format, and include alarm and leap year functionality. ISL12022MIBZ-TR5421 matches the 20-SOIC package footprint, while ISL12020MIRZ uses 20-PowerLFDFN. Both are ROHS3 compliant and Active status.

Low-Power Alternatives:

ISL1208IB8Z and ISL1208IU8Z-T7A deliver significantly reduced timekeeping current (4µA ~ 6µA) compared to the DS3231S/T&R (110µA ~ 170µA), suitable for battery-backed applications. Both maintain I2C interface, 12/24-hour time format, and alarm functionality. ISL1208IB8Z uses 8-SOIC packaging; ISL1208IU8Z-T7A uses 8-TSSOP/8-MSOP. Both are Active status and ROHS3 compliant.

Compact Package Alternatives:

1337DVGI (Renesas) and AB-RTCMC-32.768KHZ-AIGZ-S7-T (Abracon) provide space-constrained alternatives with reduced package footprints. 1337DVGI operates across 1.8V ~ 5.5V with extended temperature range (-40°C ~ 85°C). AB-RTCMC-32.768KHZ-AIGZ-S7-T operates 1V ~ 4.4V with integrated watchdog timer functionality. Both maintain I2C interface and are Active status.

Not Recommended for New Designs:

AB-RTCMC-32.768KHZ-IBO5-S3-T carries "Not For New Designs" status and should not be selected for new applications despite offering enhanced features (SRAM, trickle charge, watchdog timer).

Frequently Asked Questions (FAQ)

Q: Can DS3231S#T&R directly replace DS3231S/T&R without PCB modification?

A: Yes. DS3231S#T&R is a direct equivalent with identical pin configuration, package dimensions (16-SOIC, 0.295" × 7.50mm), and electrical specifications. No PCB layout changes are required.

Q: What is the primary reason to select an alternative RTC IC?

A: The DS3231S/T&R is Obsolete. Direct equivalent DS3231S#T&R is the preferred substitute. If DS3231S#T&R becomes unavailable, alternative parts must match I2C interface, supply voltage compatibility, and time/date format support. Package footprint differences may require PCB redesign.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and material restriction requirements.

Q: Which substitute offers the lowest power consumption?

A: AB-RTCMC-32.768KHZ-IBO5-S3-T delivers the lowest timekeeping current (0.29µA ~ 0.33µA @ 1.8V ~ 3V). However, this part is marked "Not For New Designs." For active products, ISL1208IB8Z and ISL1208IU8Z-T7A provide 4µA ~ 6µA timekeeping current, significantly lower than the DS3231S/T&R baseline.

Q: Can I use a substitute with a different package type?

A: Package substitution requires PCB redesign. ISL12022MIBZ-TR5421 maintains the 20-SOIC footprint but with different pin count (20 versus 16). Compact alternatives (1337DVGI, AB-RTCMC-32.768KHZ-AIGZ-S7-T) use 8-pin packages and require complete layout revision. Electrical compatibility does not eliminate mechanical redesign requirements.

Q: What is the operating temperature difference between DS3231S/T&R and active substitutes?

A: DS3231S/T&R operates 0°C ~ 70°C. Most active substitutes (ISL12022MIBZ-TR5421, ISL12020MIRZ, ISL1208 series, M41T00SM6F, 1337DVGI) operate -40°C ~ 85°C, providing extended low-temperature capability. BQ32002D operates 3V ~ 3.6V with -40°C ~ 85°C range but has narrower supply voltage specification.

Q: Does supply voltage range affect substitution eligibility?

A: Yes. The DS3231S/T&R operates 2.3V ~ 5.5V. Substitutes must support this range or a compatible subset. BQ32002D (3V ~ 3.6V) is incompatible with 2.3V operation. AB-RTCMC-32.768KHZ-AIGZ-S7-T (1V ~ 4.4V) does not support 5.5V operation. ISL12022MIBZ-TR5421 and ISL12020MIRZ (2.7V ~ 5.5V) are compatible with the upper range but not the 2.3V lower specification.

Q: Are all substitutes available in equivalent packaging options?

A: No. DS3231S/T&R uses 16-SOIC. Only ISL12022MIBZ-TR5421 maintains SOIC packaging (20-SOIC). Other substitutes use TSSOP, MSOP, WCDFN, or module packages, requiring mechanical redesign for PCB integration.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message