PCF85063AT/AAZ Real Time Clock (RTC) IC Equivalent & Substitute Parts

Part Overview

The PCF85063AT/AAZ is an active Real Time Clock (RTC) IC manufactured by NXP Semiconductors, designed for clock/calendar applications requiring I2C 2-Wire Serial communication. This 8-SOIC package device operates across a wide supply voltage range of 0.9V to 5.5V with minimal timekeeping current consumption of 0.6µA at 3.3V. The part is ROHS3 compliant and currently in active production status with 22,050 units in stock.

Equivalent and substitute parts are identified based on matching functional requirements: Clock/Calendar type, I2C 2-Wire Serial interface, 12/24-hour time format with YY-MM-DD-dd date format, -40°C to 85°C operating temperature range, and surface mount packaging. Substitutes must maintain compatibility with these core electrical and mechanical parameters.

Key Parameters

Parameter	PCF85063AT/AAZ
Manufacturer	NXP Semiconductors
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Voltage Supply Range	0.9V ~ 5.5V
Current - Timekeeping (Max)	0.6µA @ 3.3V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Features	Alarm, Leap Year, Square Wave Output
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution logic is based on the following critical parameters that must align with the PCF85063AT/AAZ:

Interface & Communication: All substitutes must support I2C 2-Wire Serial protocol with matching time format (HH:MM:SS, 12/24 hr) and date format (YY-MM-DD-dd).

Operating Conditions: Operating temperature range of -40°C to 85°C is mandatory. Supply voltage compatibility is evaluated based on overlap with the 0.9V to 5.5V range of the main part.

Package Compatibility: Substitutes are grouped by package type. Direct pin-compatible replacements use 8-SOIC (0.154", 3.90mm Width). Alternative packages (8-TSSOP, 8-MSOP) are listed as functional equivalents requiring PCB layout modification.

Compliance & Status: All substitutes maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory alignment.

Functional Features: Presence of Alarm, Leap Year, and Square Wave Output features determines substitution tier. Parts with additional features (NVSRAM, Watchdog Timer, SRAM) are noted as enhanced alternatives.

Parameter Comparison

Part Number	Manufacturer	Package / Case	Interface	Voltage Supply	Timekeeping Current (Max)	Operating Temp	Features	RoHS Status	Product Status
PCF85063AT/AAZ	NXP Semiconductors	8-SOIC (0.154", 3.90mm)	I2C, 2-Wire Serial	0.9V ~ 5.5V	0.6µA @ 3.3V	-40°C ~ 85°C	Alarm, Leap Year, Square Wave Output	ROHS3 Compliant	Active
1338-31DVGI8	Renesas Electronics	8-TSSOP, 8-MSOP (0.118", 3.00mm)	I2C, 2-Wire Serial	3.3V ~ 5.5V	5µA @ 3.63V ~ 5.5V	-40°C ~ 85°C	Leap Year, NVSRAM, Square Wave Output	ROHS3 Compliant	Active
DS1307ZN+T&R	Analog Devices Inc./Maxim Integrated	8-SOIC (0.154", 3.90mm)	I2C, 2-Wire Serial	4.5V ~ 5.5V	200µA @ 5V	-40°C ~ 85°C	Leap Year, NVSRAM, Square Wave Output	ROHS3 Compliant	Active
DS1338U-18+T&R	Analog Devices Inc./Maxim Integrated	8-TSSOP, 8-MSOP (0.118", 3.00mm)	I2C, 2-Wire Serial	1.71V ~ 5.5V	100µA @ 1.89V	-40°C ~ 85°C	Leap Year, NVSRAM, Square Wave Output	ROHS3 Compliant	Active
ISL12026AIVZ	Renesas Electronics	8-TSSOP (0.173", 4.40mm)	I2C, 2-Wire Serial	2.7V ~ 5.5V	10µA ~ 20µA @ 2.7V ~ 5.5V	-40°C ~ 85°C	Alarm, Leap Year	ROHS3 Compliant	Active
ISL1208IB8Z	Renesas Electronics	8-SOIC (0.154", 3.90mm)	I2C, 2-Wire Serial	2.7V ~ 5.5V	4µA ~ 6µA @ 3V ~ 5V	-40°C ~ 85°C	Alarm, Leap Year, SRAM	ROHS3 Compliant	Active
M41ST85WMX6TR	STMicroelectronics	28-SOIC (0.295", 7.50mm)	I2C, 2-Wire Serial	2.7V ~ 3.6V	0.5mA @ 2.7V ~ 3.6V	-40°C ~ 85°C	Alarm, Leap Year, NVSRAM, Square Wave Output, Supervisor, Watchdog Timer	ROHS3 Compliant	Active
M41T82ZM6F	STMicroelectronics	8-SOIC (0.154", 3.90mm)	I2C, 2-Wire Serial	2.38V ~ 5.5V	10µA @ 5.5V	-40°C ~ 85°C	Alarm, Leap Year, SRAM, Watchdog Timer	ROHS3 Compliant	Active
MCP7940MT-I/ST	Microchip Technology	8-TSSOP (0.173", 4.40mm)	I2C, 2-Wire Serial	1.8V ~ 5.5V	1µA @ 5.5V	-40°C ~ 85°C	Alarm, Leap Year, Square Wave Output, SRAM	ROHS3 Compliant	Active
MCP79410T-I/SN	Microchip Technology	8-SOIC (0.154", 3.90mm)	I2C, 2-Wire Serial	1.8V ~ 5.5V	1.2µA @ 3.3V	-40°C ~ 85°C	Alarm, Leap Year, Square Wave Output, SRAM, Unique ID	ROHS3 Compliant	Active
RX-8571LCB0 PURE SN	EPSON	12-TFSOJ (0.094", 2.40mm)	I2C, 2-Wire Serial	1.6V ~ 5.5V	0.55µA ~ 0.6µA @ 3V ~ 5V	-40°C ~ 85°C	Alarm, Leap Year, RAM	ROHS3 Compliant	Active

Engineering Selection Recommendations

Direct Pin-Compatible Replacements (8-SOIC Package):

DS1307ZN+T&R, ISL1208IB8Z, M41T82ZM6F, and MCP79410T-I/SN maintain the same 8-SOIC (0.154", 3.90mm Width) package as the PCF85063AT/AAZ, enabling direct PCB substitution without layout modification. All four parts are ROHS3 compliant and active status. DS1307ZN+T&R requires minimum supply voltage of 4.5V, limiting use in low-voltage applications. ISL1208IB8Z and M41T82ZM6F support the full 2.7V to 5.5V range. MCP79410T-I/SN extends compatibility to 1.8V minimum, offering the broadest supply voltage flexibility among 8-SOIC options.

Functional Equivalents with Alternative Packages:

1338-31DVGI8, DS1338U-18+T&R, ISL12026AIVZ, and MCP7940MT-I/ST provide functional equivalence with different package geometries (8-TSSOP or 8-MSOP). These require PCB layout redesign but maintain I2C interface compatibility and -40°C to 85°C operating range. DS1338U-18+T&R supports the widest supply voltage range (1.71V to 5.5V). MCP7940MT-I/ST achieves the lowest timekeeping current at 1µA at 5.5V.

Enhanced Feature Alternative:

M41ST85WMX6TR offers integrated Supervisor and Watchdog Timer functions in a 28-SOIC package. This part requires significant PCB redesign due to package size increase and operates within a narrower supply voltage range (2.7V to 3.6V). Selection is appropriate only when supervisor and watchdog functionality is required.

Ultra-Low Power Alternative:

RX-8571LCB0 PURE SN achieves timekeeping current of 0.55µA to 0.6µA at 3V to 5V, matching the PCF85063AT/AAZ efficiency. The 12-TFSOJ package (0.094", 2.40mm Width) is the smallest footprint available. REACH status is affected, requiring compliance verification for specific applications. This part is optimal for battery-powered applications prioritizing minimal power consumption.

All substitute parts maintain ROHS3 compliance and active product status, ensuring regulatory alignment and long-term supply availability.

Frequently Asked Questions (FAQ)

Q: Can DS1307ZN+T&R directly replace PCF85063AT/AAZ on the PCB?

A: Yes, DS1307ZN+T&R uses the same 8-SOIC (0.154", 3.90mm Width) package and can be soldered into the same footprint without PCB modification. However, verify that your circuit supplies minimum 4.5V, as DS1307ZN+T&R does not operate below this voltage threshold, unlike PCF85063AT/AAZ which functions at 0.9V.

Q: Which substitute offers the lowest power consumption?

A: RX-8571LCB0 PURE SN and PCF85063AT/AAZ both achieve 0.55µA to 0.6µA timekeeping current at 3V to 5V, making them equivalent in power efficiency. MCP7940MT-I/ST and MCP79410T-I/SN follow closely at 1µA and 1.2µA respectively.

Q: Are all substitutes I2C compatible with the original design?

A: Yes, all listed substitutes use I2C 2-Wire Serial protocol with matching time format (HH:MM:SS, 12/24 hr) and date format (YY-MM-DD-dd). No firmware changes are required for I2C communication, though register mapping may differ. Consult individual datasheets for alarm and feature register differences.

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

A: 8-SOIC (0.154", 3.90mm Width) and 8-TSSOP (0.118", 3.00mm Width) are both 8-pin surface mount packages with identical pin counts and pitch, but different physical dimensions. 8-TSSOP is narrower and requires PCB footprint redesign. Pin assignments are identical across these package types for equivalent parts.

Q: Can I use M41ST85WMX6TR as a drop-in replacement?

A: No. M41ST85WMX6TR uses a 28-SOIC package (0.295", 7.50mm Width) versus the 8-SOIC of PCF85063AT/AAZ. This requires complete PCB redesign. Additionally, M41ST85WMX6TR operates at 2.7V to 3.6V, which may not cover your full supply voltage range. Select this part only if supervisor and watchdog timer functions are required.

Q: Which substitute has the widest supply voltage range?

A: DS1338U-18+T&R supports 1.71V to 5.5V, the broadest range among all substitutes. MCP7940MT-I/ST and MCP79410T-I/SN both support 1.8V to 5.5V. These three parts are optimal for applications requiring operation across extended voltage ranges.

Q: Is REACH compliance important for my application?

A: RX-8571LCB0 PURE SN has REACH Affected status, while all other substitutes have REACH Unaffected status. If your application or market requires REACH compliance, avoid RX-8571LCB0 PURE SN or verify specific exemptions with the manufacturer.

Q: Do all substitutes support both 12-hour and 24-hour time formats?

A: Yes, all listed substitutes support HH:MM:SS time format with selectable 12/24-hour operation. RX-8571LCB0 PURE SN operates in 24-hour format only, which may require firmware adjustment if your design requires 12-hour format capability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message