ISL12082IUZ Equivalent & Substitute Parts

Part Overview

The ISL12082IUZ is a Real Time Clock (RTC) IC with Clock/Calendar functionality, manufactured by Renesas Electronics Corporation. This surface-mount device operates via I2C 2-Wire Serial interface and is packaged in a 10-MSOP form factor. The ISL12082IUZ features alarm capability, leap year support, and watchdog timer functionality with a supply voltage range of 2.7V to 5.5V and battery backup support from 1.8V to 5.5V.

The product status is listed 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	ISL12082IUZ Specification
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Voltage - Supply	2.7V ~ 5.5V
Voltage - Supply, Battery	1.8V ~ 5.5V
Current - Timekeeping (Max)	4µA ~ 6µA @ 3V ~ 5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Time Format	HH:MM:SS:hh (12/24 hr)
Date Format	YY-MM-DD-dd
Features	Alarm, Leap Year, Watchdog Timer
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the ISL12082IUZ is determined by the following critical parameters:

Primary Compatibility Criteria:

Interface type: I2C, 2-Wire Serial (mandatory match)
Mounting type: Surface Mount (mandatory match)
Operating temperature range: -40°C ~ 85°C (mandatory match)
Supply voltage compatibility: Minimum 2.7V main supply and 1.8V battery backup support
Time and date format support: HH:MM:SS and YY-MM-DD formats
RoHS3 compliance and MSL rating

Secondary Considerations:

Package form factor compatibility (10-MSOP preferred; 8-MSOP acceptable with PCB layout adjustment)
Timekeeping current consumption (lower is preferable for battery-backed applications)
Feature set alignment (alarm and leap year support)

The substitute parts listed below meet these criteria across varying package configurations and feature sets. Selection depends on specific application requirements regarding package size, feature requirements, and supply voltage constraints.

Parameter Comparison

Part Number	Manufacturer	Interface	Supply Voltage	Battery Voltage	Timekeeping Current (Max)	Operating Temp	Package / Case	Mounting Type	Features	Product Status
ISL12082IUZ	Renesas Electronics	I2C, 2-Wire Serial	2.7V ~ 5.5V	1.8V ~ 5.5V	4µA ~ 6µA @ 3V ~ 5V	-40°C ~ 85°C	10-MSOP (0.118", 3.00mm)	Surface Mount	Alarm, Leap Year, Watchdog Timer	Obsolete
DS1307+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	4.5V ~ 5.5V	2V ~ 4.6V	200µA @ 5V	0°C ~ 70°C	8-DIP (0.300", 7.62mm)	Through Hole	Leap Year, NVSRAM, Square Wave Output	Active
DS1307Z+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	4.5V ~ 5.5V	2V ~ 4.6V	200µA @ 5V	0°C ~ 70°C	8-SOIC (0.154", 3.90mm)	Surface Mount	Leap Year, NVSRAM, Square Wave Output	Active
DS1337C#	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	1.8V ~ 5.5V	—	0.6µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm)	Surface Mount	Alarm, Leap Year, Square Wave Output	Active
DS1338U-18+T&R	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	1.71V ~ 5.5V	1.3V ~ 3.7V	100µA @ 1.89V	-40°C ~ 85°C	8-MSOP (0.118", 3.00mm)	Surface Mount	Leap Year, NVSRAM, Square Wave Output	Active
DS1338U-3+T&R	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	2.7V ~ 5.5V	1.3V ~ 3.7V	200µA @ 3.3V	-40°C ~ 85°C	8-MSOP (0.118", 3.00mm)	Surface Mount	Leap Year, NVSRAM, Square Wave Output	Active
DS1339U-2+T&R	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	1.8V ~ 5.5V	1.3V ~ 3.7V	100µA @ 2.2V	-40°C ~ 85°C	8-MSOP (0.118", 3.00mm)	Surface Mount	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Active
DS1340Z-3+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	2.7V ~ 5.5V	1.3V ~ 3.7V	125µA @ 3.3V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Surface Mount	Leap Year, Trickle-Charger	Active
DS1341U+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	1.8V ~ 5.5V	—	0.5µA ~ 0.6µA @ 3V ~ 5V	-40°C ~ 85°C	8-MSOP (0.118", 3.00mm)	Surface Mount	Alarm, Leap Year, Square Wave Output	Active
DS1375T+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	1.7V ~ 5.5V	—	0.5µA @ 1.7V ~ 5.5V	-40°C ~ 85°C	6-WDFN Exposed Pad	Surface Mount	Alarm, Leap Year, Square Wave Output	Active
DS3231M+TRL	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	2.3V ~ 5.5V	2.3V ~ 5.5V	130µA ~ 200µA @ 3.63V ~ 5.5V	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm)	Surface Mount	Alarm, Leap Year, Square Wave Output	Active

Engineering Selection Recommendations

Closest Form Factor Match (Preferred for Direct Substitution):

DS1338U-18+T&R and DS1338U-3+T&R are the most compatible alternatives, both featuring 8-MSOP packaging (0.118", 3.00mm Width) with surface-mount configuration. These devices maintain I2C 2-Wire Serial interface compatibility and operate across the -40°C to 85°C temperature range. DS1338U-18+T&R supports extended supply voltage range (1.71V ~ 5.5V) with battery backup from 1.3V ~ 3.7V. DS1338U-3+T&R operates from 2.7V ~ 5.5V with identical battery backup range. Both are Active status products with ROHS3 compliance and MSL 1 rating.

Alternative Surface-Mount Options:

DS1341U+ provides the lowest timekeeping current consumption (0.5µA ~ 0.6µA @ 3V ~ 5V) in 8-MSOP packaging, suitable for ultra-low-power battery-backed applications. DS1375T+ offers the smallest footprint (6-WDFN) with comparable low power consumption (0.5µA @ 1.7V ~ 5.5V) and extended supply voltage range.

DS1337C# and DS3231M+TRL are available in 16-SOIC packaging for applications where larger package size is acceptable. DS1337C# operates from 1.8V ~ 5.5V with ultra-low timekeeping current (0.6µA @ 1.3V ~ 1.8V). DS3231M+TRL supports dual supply voltage range (2.3V ~ 5.5V for both main and battery) with integrated temperature-compensated crystal oscillator.

Legacy Through-Hole Option:

DS1307+ and DS1307Z+ represent legacy alternatives in 8-DIP and 8-SOIC packages respectively. These devices operate from 4.5V ~ 5.5V with higher timekeeping current consumption (200µA @ 5V) and narrower operating temperature range (0°C ~ 70°C). Selection of these parts is appropriate only when through-hole mounting or legacy design constraints are present.

All substitute parts listed maintain ROHS3 compliance, EAR99 ECCN classification, and REACH Unaffected status consistent with the ISL12082IUZ.

Frequently Asked Questions (FAQ)

Q: Can DS1338U-18+T&R directly replace ISL12082IUZ without PCB modifications?

A: DS1338U-18+T&R shares identical 8-MSOP packaging (0.118", 3.00mm Width) with the ISL12082IUZ, enabling direct footprint compatibility. Both devices use I2C 2-Wire Serial interface with identical pin configuration for clock and data lines. Firmware compatibility depends on application-specific register mapping and command sequences; verification against device datasheets is required.

Q: What is the primary difference between DS1338U-18+T&R and DS1338U-3+T&R?

A: The primary difference is supply voltage range. DS1338U-18+T&R operates from 1.71V ~ 5.5V, while DS1338U-3+T&R operates from 2.7V ~ 5.5V. Both share identical 8-MSOP packaging, I2C interface, and -40°C to 85°C operating temperature range. Selection depends on minimum supply voltage requirements in the target application.

Q: Why do some substitute parts lack battery backup voltage specification?

A: DS1337C# and DS1341U+ do not include battery backup voltage specifications in the provided data. These devices may incorporate alternative power management architectures or may not support independent battery backup operation. Application requirements for battery-backed timekeeping operation should be verified against complete device datasheets before selection.

Q: Is DS1307+ suitable as a substitute for new designs?

A: DS1307+ is an Active status product with ROHS3 compliance; however, it operates from 4.5V ~ 5.5V (narrower than ISL12082IUZ 2.7V ~ 5.5V range), features through-hole 8-DIP packaging (incompatible with surface-mount ISL12082IUZ footprint), and operates only to 0°C ~ 70°C (narrower than -40°C ~ 85°C). DS1307+ is appropriate only for legacy designs or applications with specific through-hole mounting requirements.

Q: Which substitute part offers the lowest power consumption for battery-backed operation?

A: DS1375T+ and DS1341U+ both provide ultra-low timekeeping current consumption. DS1375T+ operates at 0.5µA across its entire supply range (1.7V ~ 5.5V). DS1341U+ operates at 0.5µA ~ 0.6µA @ 3V ~ 5V. DS1375T+ offers the smallest package footprint (6-WDFN) and widest supply voltage range, making it optimal for space-constrained, ultra-low-power applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (DS1307+, DS1307Z+, DS1337C#, DS1338U-18+T&R, DS1338U-3+T&R, DS1339U-2+T&R, DS1340Z-3+, DS1341U+, DS1375T+, and DS3231M+TRL) maintain ROHS3 compliance consistent with the ISL12082IUZ. All are classified as EAR99 and REACH Unaffected.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 (Unlimited) indicates that the component has unlimited shelf life and does not require moisture-controlled storage or baking procedures prior to reflow soldering. All parts listed, including ISL12082IUZ and all substitutes, carry MSL 1 rating, eliminating moisture management complexity in manufacturing and storage.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message