ISL12059IBZ Equivalent & Substitute Parts

Part Overview

The ISL12059IBZ is a Real Time Clock (RTC) IC with Clock/Calendar functionality, manufactured by Renesas Electronics Corporation. It features I2C/2-Wire Serial interface, operates across 1.8V to 3.6V supply voltage range, and provides timekeeping with 0.65µA maximum current consumption at 1.8V. The device is packaged in 8-SOIC (0.154", 3.90mm Width) surface mount configuration.

The ISL12059IBZ is classified as Obsolete. Identifying equivalent and substitute RTC Clock/Calendar components is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications requiring I2C-based timekeeping functionality.

Key Parameters

Parameter	ISL12059IBZ
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Package / Case	8-SOIC (0.154", 3.90mm Width)
Voltage - Supply	1.8V ~ 3.6V
Current - Timekeeping (Max)	0.65µA @ 1.8V
Operating Temperature	-40°C ~ 85°C
Time Format	HH:MM:SS (24 hr)
Date Format	YY-MM-DD-dd
Features	Leap Year
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute RTC Clock/Calendar components for the ISL12059IBZ are selected based on the following critical parameters:

Primary Compatibility Criteria:

Interface: I2C, 2-Wire Serial (mandatory match)
Package / Case: 8-SOIC (0.154", 3.90mm Width) or compatible surface mount packages
Operating Temperature: -40°C ~ 85°C (required range)
Time Format: HH:MM:SS with 24-hour capability
Date Format: YY-MM-DD-dd
Type: Clock/Calendar functionality
RoHS Status: ROHS3 Compliant

Voltage Supply Consideration: The ISL12059IBZ operates at 1.8V ~ 3.6V. Substitute parts with wider voltage ranges (including 1.8V minimum) or narrower ranges within this specification are acceptable. Parts with supply voltage starting above 1.8V may require circuit design verification.

Current Consumption: Low timekeeping current (≤1µA at operating voltage) is preferred for battery-backed applications but is not a mandatory substitution criterion.

Substitute parts are grouped by package type and voltage compatibility to facilitate direct or near-direct replacement scenarios.

Parameter Comparison

Parameter	ISL12059IBZ	DS1307Z+	DS1308U-18+	DS1337C#	DS1338U-3+T&R	DS1339U-33+T&R	DS1375T+	DS3232SN#	M41ST81SM6F	M41ST85WMH6F	M41ST87WMX6TR
Manufacturer	Renesas	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	STMicroelectronics	STMicroelectronics	STMicroelectronics
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
Package / Case	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-TSSOP/MSOP (0.118", 3.00mm)	16-SOIC (0.295", 7.50mm)	8-TSSOP/MSOP (0.118", 3.00mm)	8-TSSOP/MSOP (0.118", 3.00mm)	6-WDFN Exposed Pad	20-SOIC (0.295", 7.50mm)	8-SOIC (0.154", 3.90mm)	28-SOP (0.350", 8.89mm)	28-SOIC (0.295", 7.50mm)
Voltage - Supply	1.8V ~ 3.6V	4.5V ~ 5.5V	1.71V ~ 5.5V	1.8V ~ 5.5V	2.7V ~ 5.5V	2.97V ~ 5.5V	1.7V ~ 5.5V	2.3V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°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
Time Format	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 (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS:hh (24 hr)	HH:MM:SS:hh (24 hr)	HH:MM:SS:hh (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
Type	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar
Features	Leap Year	Leap Year, NVSRAM, Square Wave Output	Leap Year, NVSRAM, Square Wave Output	Alarm, Leap Year, Square Wave Output	Leap Year, NVSRAM, Square Wave Output	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Alarm, Leap Year, Square Wave Output	Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal	Alarm, Leap Year, Square Wave Output, Watchdog Timer	Alarm, Leap Year, NVSRAM, Square Wave Output, Supervisor, Watchdog Timer	Alarm, Leap Year, NVSRAM, Square Wave Output, Supervisor, Watchdog Timer
RoHS Status	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

Engineering Selection Recommendations

Direct Package Match (8-SOIC, 0.154" × 3.90mm):

DS1307Z+ and M41ST81SM6F are packaged in 8-SOIC form factor matching the ISL12059IBZ. DS1307Z+ operates at 4.5V ~ 5.5V supply voltage, which exceeds the ISL12059IBZ specification of 1.8V ~ 3.6V and requires circuit redesign. M41ST81SM6F operates at 2.7V ~ 5.5V, overlapping the upper portion of the ISL12059IBZ voltage range (2.7V ~ 3.6V) and is suitable for 3.3V and 5V systems. Both are Active products with ROHS3 compliance.

Compact Packages (8-TSSOP/MSOP, 0.118" × 3.00mm):

DS1308U-18+, DS1338U-3+T&R, and DS1339U-33+T&R are packaged in 8-TSSOP/MSOP form factor, offering smaller footprint than the ISL12059IBZ. DS1308U-18+ operates at 1.71V ~ 5.5V, providing the lowest minimum voltage specification. DS1338U-3+T&R and DS1339U-33+T&R operate at 2.7V ~ 5.5V and 2.97V ~ 5.5V respectively. All three are Active products with ROHS3 compliance and support -40°C ~ 85°C operating temperature range.

Minimal Package (6-WDFN, 3×3mm):

DS1375T+ is the smallest package option, featuring 6-WDFN Exposed Pad configuration. It operates at 1.7V ~ 5.5V supply voltage and provides 0.5µA timekeeping current at 1.7V ~ 5.5V. This device is Active with ROHS3 compliance and full -40°C ~ 85°C temperature support.

Enhanced Feature Packages (16-SOIC and larger):

DS1337C# (16-SOIC), DS3232SN# (20-SOIC), M41ST85WMH6F (28-SOP), and M41ST87WMX6TR (28-SOIC) provide additional functionality including alarm capability, expanded memory, and integrated supervisory features. These are suitable for applications requiring enhanced timekeeping capabilities beyond basic clock/calendar function. All are Active products with ROHS3 compliance.

Voltage Compatibility Assessment:

For applications operating at 1.8V ~ 3.6V (ISL12059IBZ specification), DS1308U-18+ (1.71V ~ 5.5V) and DS1375T+ (1.7V ~ 5.5V) provide the closest voltage envelope match. M41ST81SM6F operates at 2.7V ~ 5.5V and is suitable for 3.3V systems within the ISL12059IBZ range. DS1307Z+ (4.5V ~ 5.5V) is not recommended for direct replacement in low-voltage applications.

Product Status:

All substitute parts listed are Active products, ensuring ongoing availability and manufacturing support. The ISL12059IBZ is Obsolete, making substitution necessary for new designs and long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can DS1307Z+ directly replace ISL12059IBZ in a 3.3V system?

A: No. DS1307Z+ requires 4.5V ~ 5.5V supply voltage, which is incompatible with the ISL12059IBZ specification of 1.8V ~ 3.6V. Circuit redesign would be required to use DS1307Z+ in a 3.3V application.

Q: Which substitute part has the lowest supply voltage requirement?

A: DS1308U-18+ and DS1375T+ both support 1.7V ~ 1.71V minimum supply voltage, closely matching the ISL12059IBZ minimum of 1.8V. DS1375T+ additionally offers the smallest package footprint (6-WDFN).

Q: Is M41ST81SM6F a pin-compatible replacement for ISL12059IBZ?

A: M41ST81SM6F shares the same 8-SOIC (0.154", 3.90mm Width) package as ISL12059IBZ, making it physically compatible for PCB layout. However, functional compatibility must be verified through datasheet comparison, as pin assignments and feature sets may differ.

Q: What is the key difference between DS1308U-18+ and DS1338U-3+T&R?

A: Both devices are packaged in 8-TSSOP/MSOP form factor and support I2C interface. DS1308U-18+ operates at 1.71V ~ 5.5V, while DS1338U-3+T&R operates at 2.7V ~ 5.5V. DS1308U-18+ provides lower minimum voltage operation suitable for battery-backed applications. Both include NVSRAM and Square Wave Output features.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (DS1307Z+, DS1308U-18+, DS1337C#, DS1338U-3+T&R, DS1339U-33+T&R, DS1375T+, DS3232SN#, M41ST81SM6F, M41ST85WMH6F, M41ST87WMX6TR) are ROHS3 Compliant, matching the ISL12059IBZ compliance status.

Q: Which substitute offers the best low-power timekeeping performance?

A: DS1375T+ provides 0.5µA timekeeping current at 1.7V ~ 5.5V, and DS1337C# provides 0.6µA at 1.3V ~ 1.8V. Both exceed the ISL12059IBZ specification of 0.65µA @ 1.8V in terms of efficiency. DS1375T+ is recommended for ultra-low-power battery-backed applications.

Q: Can I use a 28-pin package substitute in place of an 8-pin ISL12059IBZ?

A: No. Package substitution requires PCB redesign. M41ST85WMH6F (28-SOP) and M41ST87WMX6TR (28-SOIC) are not pin-compatible with the 8-SOIC ISL12059IBZ. These larger packages are suitable only for new designs where additional functionality (supervisor, watchdog timer) is required.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts support -40°C ~ 85°C operating temperature range, matching the ISL12059IBZ specification. DS1307Z+ is the exception, supporting only 0°C ~ 70°C, making it unsuitable for extended temperature applications.

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