ISL12030IBZ Equivalent & Substitute Parts

Part Overview

The ISL12030IBZ is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Renesas Electronics Corporation. This device integrates 128 bytes of SRAM, I2C/2-Wire Serial interface, and features including alarm capability and daylight savings support. The ISL12030IBZ operates across a 2.7V to 5.5V supply range with a maximum timekeeping current of 18µA at 5.5V, housed in an 8-SOIC package.

The ISL12030IBZ is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications requiring RTC functionality with I2C interface compatibility.

Key Parameters

Parameter	ISL12030IBZ
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Memory Size	128B
Time Format	HH:MM:SS:hh (12/24 hr)
Date Format	YY-MM-DD-dd
Voltage Supply Range	2.7V ~ 5.5V
Current - Timekeeping (Max)	18µA @ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Features	Alarm, Daylight Savings, SRAM
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the ISL12030IBZ is determined by the following critical parameters:

Interface Compatibility: All substitute parts must support I2C/2-Wire Serial communication to maintain firmware and circuit compatibility.

Voltage Supply Range: Substitute parts must operate within or encompass the 2.7V to 5.5V range. Parts with lower minimum voltage (1.3V, 1.8V, 1.71V) or higher maximum voltage remain compatible as they support the required operating window.

Time and Date Format: All substitutes must support both 12/24-hour time format and YY-MM-DD-dd date format to ensure calendar functionality equivalence.

Operating Temperature Range: All substitutes must maintain the -40°C to 85°C operating temperature specification.

Package Compatibility: The 8-SOIC package is the primary form factor. Substitutes in alternative packages (8-TSSOP, 8-MSOP, 8-LCC, 8-WFDFN) are functionally equivalent but require PCB layout modification.

Compliance: All substitutes must maintain ROHS3 compliance and EAR99 export classification.

Substitutes are grouped by package type: 8-SOIC direct replacements, 8-TSSOP/8-MSOP alternatives, 8-LCC alternatives, and 8-WFDFN alternatives.

Parameter Comparison

Parameter	ISL12030IBZ	M41T82RM6F	PT7C4563WE	DS1338U-33+	DS1339BU+T	DS1339U-2+T&R	DS1339U-33+	M41T62LC6F	MCP7940MT-I/MNY	MCP79411T-I/MNY	PCF2127T/2Y	PT7C4563WE
Manufacturer	Renesas	STMicroelectronics	Diodes Inc.	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	STMicroelectronics	Microchip	Microchip	NXP USA Inc.	Diodes Inc.
Interface	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire
Time Format	HH:MM:SS:hh (12/24 hr)	HH:MM:SS:hh (24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS:hh (24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
Voltage Supply Range	2.7V ~ 5.5V	2.7V ~ 5.5V	1.3V ~ 5.5V	3V ~ 5.5V	1.71V ~ 5.5V	1.8V ~ 5.5V	2.97V ~ 5.5V	1.3V ~ 4.4V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 4.2V	1.3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-TSSOP/8-MSOP	8-TSSOP/8-MSOP	8-TSSOP/8-MSOP	8-TSSOP/8-MSOP	8-LCC	8-WFDFN	8-WFDFN	16-SOIC	8-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Package Replacement (8-SOIC):

M41T82RM6F and PT7C4563WE are direct 8-SOIC package replacements. Both maintain the ISL12030IBZ's 2.7V to 5.5V supply range and -40°C to 85°C operating temperature. M41T82RM6F is currently in active production status with 2,705 units in stock. PT7C4563WE is also active with 1,015 units available. Both support I2C interface and YY-MM-DD-dd date format. M41T82RM6F offers lower timekeeping current (10µA @ 5.5V) compared to the ISL12030IBZ (18µA @ 5.5V), providing improved power efficiency.

Alternative Package Options:

DS1338U-33+, DS1339BU+T, DS1339U-2+T&R, and DS1339U-33+ are available in 8-TSSOP/8-MSOP packages. These require PCB layout modification but offer active production status and high inventory availability (834 to 16,931 units). DS1339BU+T provides the largest inventory (16,931 units) and supports alarm, leap year, and square wave output features.

M41T62LC6F in 8-LCC package offers extremely low timekeeping current (0.7µA to 0.95µA) and operates across 1.3V to 4.4V, suitable for ultra-low-power applications. This part is active with 15,675 units in stock.

MCP7940MT-I/MNY and MCP79411T-I/MNY in 8-WFDFN packages provide compact form factors with active production status. MCP79411T-I/MNY includes additional 1Kb memory and unique ID features.

PCF2127T/2Y in 16-SOIC package offers 512B memory, watchdog timer, and TCXO/Crystal support, suitable for applications requiring extended memory and timing precision.

All substitute parts maintain ROHS3 compliance and EAR99 export classification consistent with the ISL12030IBZ.

Frequently Asked Questions (FAQ)

Q: Can I directly replace ISL12030IBZ with M41T82RM6F or PT7C4563WE without PCB modification?

A: Yes. Both M41T82RM6F and PT7C4563WE are housed in 8-SOIC packages identical to the ISL12030IBZ. Pin-to-pin compatibility requires verification against device datasheets, but both support I2C interface, YY-MM-DD-dd date format, and -40°C to 85°C operating temperature. No PCB layout changes are necessary.

Q: What is the primary difference between 8-SOIC and 8-TSSOP packages?

A: 8-SOIC (0.154", 3.90mm width) and 8-TSSOP/8-MSOP (0.118", 3.00mm width) differ in physical dimensions and pin pitch. TSSOP packages are more compact. Substitution requires PCB footprint redesign and re-layout. Electrical functionality remains equivalent.

Q: Which substitute offers the lowest power consumption?

A: M41T62LC6F provides the lowest timekeeping current at 0.7µA to 0.95µA across its 1.3V to 4.4V operating range. This is significantly lower than the ISL12030IBZ (18µA @ 5.5V). However, M41T62LC6F operates at lower maximum voltage (4.4V vs. 5.5V) and requires 8-LCC package redesign.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and EAR99 export classification, consistent with the ISL12030IBZ.

Q: What is the inventory status of substitute parts?

A: All substitute parts are currently in active production with available inventory: M41T82RM6F (2,705 units), PT7C4563WE (1,015 units), DS1338U-33+ (1,410 units), DS1339BU+T (16,931 units), DS1339U-2+T&R (834 units), DS1339U-33+ (1,774 units), M41T62LC6F (15,675 units), MCP7940MT-I/MNY (5,856 units), MCP79411T-I/MNY (3,700 units), and PCF2127T/2Y (1,900 units).

Q: Can I use a 16-SOIC package substitute like PCF2127T/2Y?

A: PCF2127T/2Y is functionally compatible but requires significant PCB redesign due to 16-pin configuration versus 8-pin. This substitute is appropriate only when additional features (512B memory, watchdog timer, TCXO support) justify the layout modification effort.

Q: Do all substitutes support 12/24-hour time format?

A: Most substitutes support 12/24-hour format. M41T82RM6F and M41T62LC6F support 24-hour format only. PT7C4563WE supports 24-hour format only. Verify firmware compatibility if 12-hour format is required for your application.

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