PCF8523AUG/HAV Equivalent & Substitute Parts

Part Overview

The PCF8523AUG/HAV is a Real Time Clock (RTC) IC manufactured by NXP USA Inc., designed for clock/calendar applications with I2C 2-Wire Serial interface. This die-form component operates across a wide voltage range of 1.6V to 5.5V and includes features such as alarm functionality, leap year support, and watchdog timer capability. The part is currently in active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part's specifications, enabling direct functional replacement in applications requiring RTC clock/calendar functionality with I2C interface.

Key Parameters

Parameter	PCF8523AUG/HAV
Manufacturer	NXP USA Inc.
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Voltage Supply Range	1.6V ~ 5.5V
Voltage Supply Battery	1.8V ~ 5.5V
Current Timekeeping (Max)	0.5µA @ 2V ~ 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, Watchdog Timer
Mounting Type	Surface Mount
Package Type	Die
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the PCF8523AUG/HAV are identified based on the following critical parameters:

Interface Compatibility: I2C 2-Wire Serial protocol
Voltage Supply Range: Overlap with 1.6V ~ 5.5V specification
Operating Temperature Range: -40°C ~ 85°C
Time/Date Format Support: HH:MM:SS and YY-MM-DD-dd capability
Core Features: Alarm and Leap Year support
Product Status: Active
Compliance: ROHS3 Compliant

Substitute parts are grouped into two categories based on packaging and electrical characteristics:

Group 1 - Enhanced Feature Set (256B Memory, Trickle-Charger):

AB0805-T3 (Abracon LLC) - 16-VFQFN package with SRAM and trickle-charger

Group 2 - Standard RTC Variants (56B Memory, NVSRAM):

DS1307Z+, DS1307Z+T&R (Analog Devices Inc./Maxim Integrated) - 8-SOIC package
DS1308U-18+ (Analog Devices Inc./Maxim Integrated) - 8-TSSOP/8-MSOP package
DS1339AU+T, DS1339U-2+ (Analog Devices Inc./Maxim Integrated) - 8-TSSOP/8-MSOP package with trickle-charger
DS1341U+, DS1341U+T&R (Analog Devices Inc./Maxim Integrated) - 8-TSSOP/8-MSOP package
DS1342U+T&R (Analog Devices Inc./Maxim Integrated) - 8-TSSOP/8-MSOP package
DS3231M+TRL (Analog Devices Inc./Maxim Integrated) - 16-SOIC package

Parameter Comparison

Part Number	Manufacturer	Interface	Voltage Supply	Battery Voltage	Current Timekeeping (Max)	Operating Temp	Time Format	Date Format	Features	Package	RoHS Status
PCF8523AUG/HAV	NXP USA Inc.	I2C, 2-Wire Serial	1.6V ~ 5.5V	1.8V ~ 5.5V	0.5µA @ 2V ~ 5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Watchdog Timer	Die	ROHS3 Compliant
AB0805-T3	Abracon LLC	I2C, 2-Wire Serial	1.7V ~ 3.6V	1.5V ~ 3.6V	0.17µA ~ 0.22µA @ 1.8V ~ 3V	-40°C ~ 85°C	HH:MM:SS:hh	YY-MM-DD-dd	Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog Timer	16-VFQFN Exposed Pad	ROHS3 Compliant
DS1307Z+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	4.5V ~ 5.5V	2V ~ 4.6V	200µA @ 5V	0°C ~ 70°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Leap Year, NVSRAM, Square Wave Output	8-SOIC (0.154", 3.90mm Width)	ROHS3 Compliant
DS1307Z+T&R	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	4.5V ~ 5.5V	2V ~ 4.6V	200µA @ 5V	0°C ~ 70°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Leap Year, NVSRAM, Square Wave Output	8-SOIC (0.154", 3.90mm Width)	ROHS3 Compliant
DS1308U-18+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	1.71V ~ 5.5V	1.3V ~ 5.5V	100µA @ 200µA @ 1.89V ~ 5.5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Leap Year, NVSRAM, Square Wave Output	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	ROHS3 Compliant
DS1339AU+T	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	1.71V ~ 5.5V	1.3V ~ 3.7V	200µA @ 1.71V ~ 5.5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output, Trickle-Charger	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	ROHS3 Compliant
DS1339U-2+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	1.8V ~ 5.5V	1.3V ~ 3.7V	100µA @ 2.2V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output, Trickle-Charger	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	ROHS3 Compliant
DS1341U+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	1.8V ~ 5.5V	—	0.5µA ~ 0.6µA @ 3V ~ 5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	ROHS3 Compliant
DS1341U+T&R	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	1.8V ~ 5.5V	—	0.5µA ~ 0.6µA @ 3V ~ 5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	ROHS3 Compliant
DS1342U+T&R	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	1.8V ~ 5.5V	—	0.6µA ~ 0.7µA @ 3V ~ 5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	ROHS3 Compliant
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	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output	16-SOIC (0.295", 7.50mm Width)	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed maintain active product status and ROHS3 compliance, meeting the regulatory and availability requirements of the PCF8523AUG/HAV. Selection among substitutes depends on specific application constraints:

For applications requiring lowest power consumption in battery-backed operation: AB0805-T3 delivers 0.17µA ~ 0.22µA timekeeping current, significantly lower than the main part's 0.5µA specification. This part also includes integrated SRAM and trickle-charger functionality. Voltage supply range is limited to 1.7V ~ 3.6V, requiring design verification for compatibility with systems requiring the full 1.6V ~ 5.5V range.

For applications with standard 5V supply and cost optimization: DS1307Z+ and DS1307Z+T&R operate within 4.5V ~ 5.5V supply range with 56B NVSRAM. Operating temperature range is restricted to 0°C ~ 70°C, limiting use in extended temperature applications. Timekeeping current is 200µA at 5V.

For applications requiring extended temperature range (-40°C ~ 85°C) with moderate power consumption: DS1308U-18+, DS1339AU+T, DS1339U-2+, DS1341U+, DS1341U+T&R, and DS1342U+T&R all support the full -40°C ~ 85°C operating temperature range. DS1341U+ and DS1341U+T&R offer the lowest timekeeping current (0.5µA ~ 0.6µA @ 3V ~ 5V) among this group, matching the main part's power profile. DS1339 variants include trickle-charger functionality.

For applications requiring 16-pin package with integrated features: DS3231M+TRL provides 16-SOIC packaging with alarm and square wave output capabilities. Operating voltage range is 2.3V ~ 5.5V, and timekeeping current is 130µA ~ 200µA at 3.63V ~ 5.5V.

Frequently Asked Questions (FAQ)

Q: Can DS1307Z+ directly replace PCF8523AUG/HAV in all applications?

A: DS1307Z+ shares I2C interface, time/date format, and leap year support. However, operating temperature range differs: DS1307Z+ operates 0°C ~ 70°C versus PCF8523AUG/HAV's -40°C ~ 85°C. Applications requiring extended temperature operation must use alternative substitutes. Additionally, DS1307Z+ requires 4.5V ~ 5.5V supply, restricting use in low-voltage systems.

Q: What is the primary advantage of AB0805-T3 over other substitutes?

A: AB0805-T3 delivers significantly lower timekeeping current (0.17µA ~ 0.22µA) compared to the main part (0.5µA), reducing battery drain in battery-backed applications. It also includes 256B SRAM and trickle-charger functionality. The trade-off is a narrower voltage supply range (1.7V ~ 3.6V) and different package type (16-VFQFN versus die form).

Q: Are DS1341U+ and DS1341U+T&R functionally identical?

A: DS1341U+ and DS1341U+T&R are electrically identical. The difference is packaging: DS1341U+ is supplied in Tube packaging, while DS1341U+T&R is supplied in Cut Tape (CT) & Digi-Reel format. Both support -40°C ~ 85°C operating temperature and deliver 0.5µA ~ 0.6µA timekeeping current at 3V ~ 5V.

Q: Which substitute is best for battery-backed real-time clock applications?

A: DS1341U+ or DS1341U+T&R are optimal for battery-backed applications, offering 0.5µA ~ 0.6µA timekeeping current matching the main part's specification. Both support 1.8V ~ 5.5V supply range and -40°C ~ 85°C operating temperature. AB0805-T3 offers even lower power consumption (0.17µA ~ 0.22µA) but is limited to 1.7V ~ 3.6V supply range.

Q: What packaging considerations apply when substituting the die-form PCF8523AUG/HAV?

A: PCF8523AUG/HAV is supplied as a die, requiring integration into a larger assembly. All listed substitutes are packaged components (SOIC, TSSOP, MSOP, VFQFN). Design changes are required to accommodate the selected substitute's package type. Package selection affects PCB layout, thermal management, and assembly process compatibility.

Q: Can DS1339 variants replace PCF8523AUG/HAV in applications requiring trickle-charger functionality?

A: DS1339AU+T and DS1339U-2+ include trickle-charger functionality, matching applications that require automatic battery charging capability. Both support -40°C ~ 85°C operating temperature and I2C interface. DS1339AU+T operates 1.71V ~ 5.5V supply range, while DS1339U-2+ operates 1.8V ~ 5.5V. Timekeeping current differs: DS1339AU+T at 200µA versus DS1339U-2+ at 100µA @ 2.2V.

Q: Is MSL (Moisture Sensitivity Level) rating consistent across all substitutes?

A: PCF8523AUG/HAV carries MSL 1 (Unlimited). Most substitutes also carry MSL 1, except DS3231M+TRL which carries MSL 3 (168 Hours). MSL 3 requires controlled storage and handling procedures to prevent moisture absorption during storage and before reflow soldering.

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