ISL12025IVZ Equivalent & Substitute Parts

Part Overview

The ISL12025IVZ 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, supervisor function, unique ID, and watchdog timer in an 8-TSSOP package. The ISL12025IVZ is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	ISL12025IVZ
Manufacturer	Renesas Electronics Corporation
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Interface	I2C, 2-Wire Serial
Voltage - Supply	2.7V ~ 5.5V
Voltage - Supply, Battery	1.8V ~ 5.5V
Current - Timekeeping (Max)	10µA ~ 20µA @ 2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Features	Alarm, Leap Year, Supervisor, Unique ID, Watchdog Timer
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the ISL12025IVZ is determined by the following critical parameters:

Interface type: I2C/2-Wire Serial protocol compatibility
Operating voltage range: Supply voltage 2.7V ~ 5.5V minimum overlap
Time and date format support: HH:MM:SS and YY-MM-DD-dd capability
Operating temperature range: -40°C ~ 85°C
Package compatibility: Surface mount options
Product status: Active status preferred for long-term availability
RoHS compliance: ROHS3 Compliant

Substitute parts are grouped by package type and feature set. Direct package substitutes (8-TSSOP, 8-SOIC, 8-MSOP) are prioritized. Parts with lower timekeeping current consumption or extended voltage ranges provide enhanced performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Package	Interface	Supply Voltage	Battery Voltage	Timekeeping Current	Operating Temp	Time Format	Status
ISL12025IVZ	Renesas	8-TSSOP	I2C, 2-Wire	2.7V ~ 5.5V	1.8V ~ 5.5V	10µA ~ 20µA	-40°C ~ 85°C	12/24 hr	Obsolete
AB-RTCMC-32.768KHZ-B5GA-S3-T	Abracon LLC	10-SMD Module	I2C, 2-Wire	1.2V ~ 5.5V	—	0.45µA ~ 0.55µA	-40°C ~ 85°C	24 hr	Active
BQ32000D	Texas Instruments	8-SOIC	I2C, 2-Wire	3V ~ 3.6V	1.4V ~ 3.6V	100µA	-40°C ~ 85°C	24 hr	Active
BQ32002DR	Texas Instruments	8-SOIC	I2C, 2-Wire	3V ~ 3.6V	1.4V ~ 3.6V	65µA	-40°C ~ 85°C	24 hr	Active
DS1308U-18+T	Analog Devices Inc./Maxim	8-TSSOP, 8-MSOP	I2C, 2-Wire	1.71V ~ 5.5V	1.3V ~ 5.5V	100µA ~ 200µA	-40°C ~ 85°C	12/24 hr	Active
DS1308U-3+	Analog Devices Inc./Maxim	8-TSSOP, 8-MSOP	I2C, 2-Wire	2.7V ~ 5.5V	1.3V ~ 5.5V	—	-40°C ~ 85°C	12/24 hr	Active
DS1338C-3#	Analog Devices Inc./Maxim	16-SOIC	I2C, 2-Wire	2.7V ~ 5.5V	1.3V ~ 3.7V	200µA	-40°C ~ 85°C	12/24 hr	Active
DS1338Z-3+T&R	Analog Devices Inc./Maxim	8-SOIC	I2C, 2-Wire	2.7V ~ 5.5V	1.3V ~ 3.7V	200µA	-40°C ~ 85°C	12/24 hr	Active
DS1339BU+	Analog Devices Inc./Maxim	8-TSSOP, 8-MSOP	I2C, 2-Wire	1.71V ~ 5.5V	1.3V ~ 3.7V	200µA	-40°C ~ 85°C	12/24 hr	Active
DS1339U-3+	Analog Devices Inc./Maxim	8-TSSOP, 8-MSOP	I2C, 2-Wire	2.7V ~ 5.5V	1.3V ~ 3.7V	150µA	-40°C ~ 85°C	12/24 hr	Active
DS1340C-18#	Analog Devices Inc./Maxim	16-SOIC	I2C, 2-Wire	1.71V ~ 5.5V	1.3V ~ 3.7V	100µA	-40°C ~ 85°C	24 hr	Active

Engineering Selection Recommendations

All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the ISL12025IVZ. All parts operate within the -40°C ~ 85°C temperature range.

For direct package compatibility with 8-TSSOP form factor, DS1308U-18+T, DS1308U-3+, DS1339BU+, and DS1339U-3+ are suitable options. These parts support 12/24-hour time format matching the original specification.

For applications requiring lower timekeeping current consumption, AB-RTCMC-32.768KHZ-B5GA-S3-T offers 0.45µA ~ 0.55µA operation, though this is a module package rather than discrete IC.

For 8-SOIC package alternatives, DS1338Z-3+T&R and BQ32002DR provide active product status. BQ32002DR offers reduced timekeeping current at 65µA compared to DS1338Z-3+T&R at 200µA.

Parts with extended lower voltage support (1.71V supply minimum) include DS1308U-18+T, DS1339BU+, and DS1340C-18#, providing flexibility for battery-backed applications.

Frequently Asked Questions (FAQ)

Q: Can DS1308U-3+ directly replace ISL12025IVZ in the same PCB footprint?

A: DS1308U-3+ is available in 8-TSSOP package matching ISL12025IVZ dimensions. Pin-to-pin compatibility requires verification against device datasheets, as I2C interface and supply voltage ranges overlap but functional pinout may differ.

Q: What is the primary advantage of AB-RTCMC-32.768KHZ-B5GA-S3-T?

A: This module offers significantly lower timekeeping current (0.45µA ~ 0.55µA) compared to ISL12025IVZ (10µA ~ 20µA), reducing battery drain in battery-backed applications. However, it is a module package rather than discrete IC, affecting PCB integration approach.

Q: Which substitute parts support the full 2.7V ~ 5.5V supply voltage range of ISL12025IVZ?

A: DS1308U-3+, DS1338C-3#, DS1338Z-3+T&R, and DS1339U-3+ all support 2.7V ~ 5.5V supply voltage range. DS1308U-18+T and DS1339BU+ support extended lower voltage at 1.71V minimum.

Q: Are all substitute parts in active product status?

A: Yes, all listed substitute parts maintain active product status, ensuring long-term availability and manufacturing support. ISL12025IVZ is obsolete, making active alternatives necessary for production continuity.

Q: Do substitute parts maintain 12/24-hour time format support?

A: DS1308U-18+T, DS1308U-3+, DS1338C-3#, DS1338Z-3+T&R, DS1339BU+, and DS1339U-3+ support 12/24-hour format. BQ32000D, BQ32002DR, and DS1340C-18# support 24-hour format only.

Q: What package options are available for I2C RTC substitutes?

A: Available packages include 8-TSSOP (DS1308U, DS1339U variants), 8-SOIC (BQ32000D, BQ32002DR, DS1338Z-3+T&R), 8-MSOP (DS1308U, DS1339U variants), 16-SOIC (DS1338C-3#, DS1340C-18#), and 10-SMD Module (AB-RTCMC).

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