PT7C4563BUEX Equivalent & Substitute Parts

Part Overview

The PT7C4563BUEX is a Real Time Clock (RTC) IC manufactured by Diodes Incorporated, designed for clock/calendar applications with I2C serial interface. This device operates across a wide supply voltage range of 1.3V to 5.5V and features alarm functionality, leap year support, and square wave output capabilities. The part is packaged in 8-TSSOP (8-MSOP) surface mount configuration with a timekeeping current consumption of 0.65µA to 0.85µA at 3V to 5V.

The PT7C4563BUEX is currently listed 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	PT7C4563BUEX
Manufacturer	Diodes Incorporated
Product Status	Obsolete
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Voltage - Supply	1.3V ~ 5.5V
Current - Timekeeping (Max)	0.65µA ~ 0.85µA @ 3V ~ 5V
Operating Temperature	-40°C ~ 85°C
Time Format	HH:MM:SS (24 hr)
Date Format	YY-MM-DD-dd
Features	Alarm, Leap Year, Square Wave Output
RoHS Status	ROHS3 Compliant
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the PT7C4563BUEX is determined by the following critical parameters:

Primary Compatibility Criteria:

Interface: I2C, 2-Wire Serial (mandatory match)
Operating Temperature: -40°C ~ 85°C (mandatory match)
Voltage Supply Range: Must encompass or overlap with 1.3V ~ 5.5V
Package Type: 8-pin surface mount configurations (8-TSSOP, 8-MSOP, 8-SOIC, or 8-uMAX/uSOP)
RoHS Compliance: ROHS3 Compliant (mandatory match)

Secondary Functional Criteria:

Time Format: 24-hour or 12/24-hour selectable
Date Format: YY-MM-DD-dd support
Features: Alarm and Leap Year support (core requirements)

Substitute parts are grouped into two categories based on package compatibility:

Category A - Direct Package Match (8-TSSOP/8-MSOP/8-SOIC/8-uMAX): Parts maintaining the same 8-pin surface mount footprint with full voltage range compatibility and active product status.

Category B - Alternative Packages (16-pin and smaller packages): Parts with enhanced functionality or different package configurations that maintain I2C interface and core RTC features but require PCB layout modification.

Parameter Comparison

Parameter	PT7C4563BUEX	1339-31DVGI8	AB0805-T3	DS1337S+T&R	DS1338U-3+T&R	DS1339AU+T	DS1341U+
Manufacturer	Diodes Inc.	Renesas Electronics	Abracon LLC	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Interface	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire
Package / Case	8-TSSOP/MSOP	8-TSSOP	16-VFQFN	8-SOIC	8-TSSOP/MSOP	8-TSSOP/MSOP	8-TSSOP/MSOP
Voltage - Supply	1.3V ~ 5.5V	3.3V ~ 5.5V	1.7V ~ 3.6V	1.8V ~ 5.5V	2.7V ~ 5.5V	1.71V ~ 5.5V	1.8V ~ 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
Time Format	HH:MM:SS (24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS:hh	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 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
Features	Alarm, Leap Year, Square Wave Output	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog Timer	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Current - Timekeeping (Max)	0.65µA ~ 0.85µA @ 3V ~ 5V	200µA @ 3.63V ~ 5.5V	0.17µA ~ 0.22µA @ 1.8V ~ 3V	0.6µA @ 1.3V ~ 1.8V	200µA @ 3.3V	200µA @ 1.71V ~ 5.5V	0.5µA ~ 0.6µA @ 3V ~ 5V

Engineering Selection Recommendations

Direct Substitutes (Same 8-pin Package, Active Status):

DS1341U+ is the primary recommended substitute. This Analog Devices/Maxim part maintains the 8-TSSOP/8-MSOP package footprint, operates across 1.8V to 5.5V supply range, and delivers timekeeping current of 0.5µA to 0.6µA at 3V to 5V—comparable to the original PT7C4563BUEX. The device is ROHS3 compliant with active product status and unlimited MSL rating, ensuring long-term availability and supply chain stability.

DS1339AU+T provides an alternative with identical package configuration and extended voltage range (1.71V to 5.5V). This part includes trickle-charger functionality and maintains ROHS3 compliance with active status. Timekeeping current is specified at 200µA across the full voltage range.

1339-31DVGI8 (Renesas Electronics) offers 8-TSSOP packaging with ROHS3 compliance and active status. However, the minimum supply voltage is 3.3V, which does not fully encompass the original part's 1.3V lower limit. This part is suitable only for applications operating at 3.3V or higher.

Alternative Package Options (Active Status, Enhanced Features):

AB0805-T3 (Abracon LLC) provides a 16-VFQFN package with superior timekeeping current performance (0.17µA to 0.22µA at 1.8V to 3V) and includes 256B SRAM, trickle-charger, and watchdog timer functionality. This option requires PCB layout modification but offers enhanced integration for power-sensitive applications. MSL rating of 1 (Unlimited) ensures handling flexibility.

DS1337S+T&R (Analog Devices/Maxim) in 8-SOIC package maintains 1.8V to 5.5V operation with 0.6µA timekeeping current at 1.3V to 1.8V. ROHS3 compliant with active status and unlimited MSL rating.

Selection Criteria Summary:

All recommended substitutes maintain I2C interface compatibility, -40°C to 85°C operating temperature range, and ROHS3 compliance. Product status is active for all alternatives, ensuring sustained availability. Selection should prioritize DS1341U+ for direct footprint compatibility with minimal design modification, or AB0805-T3 for applications requiring enhanced features and superior power efficiency.

Frequently Asked Questions (FAQ)

Q: Can DS1338U-3+T&R be used as a direct replacement for PT7C4563BUEX?

A: DS1338U-3+T&R maintains the 8-TSSOP/8-MSOP package and I2C interface. However, the minimum supply voltage is 2.7V, which does not cover the original part's 1.3V lower operating limit. This part is compatible only for applications operating at 2.7V or higher. Additionally, timekeeping current is specified at 200µA at 3.3V, which is higher than the original 0.65µA to 0.85µA specification.

Q: What is the key difference between DS1341U+ and DS1339AU+T?

A: Both parts use the 8-TSSOP/8-MSOP package and I2C interface. DS1341U+ operates from 1.8V to 5.5V with timekeeping current of 0.5µA to 0.6µA at 3V to 5V, matching the original part's power profile more closely. DS1339AU+T operates from 1.71V to 5.5V but specifies 200µA timekeeping current across the full voltage range. DS1341U+ is preferred for power-sensitive applications.

Q: Why does AB0805-T3 use a different package (16-VFQFN) than the original PT7C4563BUEX?

A: AB0805-T3 employs a 16-pin VFQFN package to accommodate additional features including 256B SRAM, trickle-charger, and watchdog timer functionality. This package change requires PCB layout modification but provides enhanced integration and superior timekeeping current performance (0.17µA to 0.22µA at 1.8V to 3V). This option is suitable for redesign scenarios where additional functionality is beneficial.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—1339-31DVGI8, AB0805-T3, DS1337S+T&R, DS1338U-3+T&R, DS1339AU+T, DS1341U+, DS1375T+, and DS3231M+—are ROHS3 compliant, matching the original PT7C4563BUEX compliance status.

Q: What does MSL (Moisture Sensitivity Level) rating mean for component selection?

A: MSL rating indicates the maximum time a component can be exposed to moisture before soldering. MSL 1 (Unlimited) means the part has no moisture sensitivity restrictions and can be stored indefinitely. MSL 3 (168 Hours) requires the part to be soldered within 168 hours of package opening. For supply chain flexibility, parts with MSL 1 rating are preferred.

Q: Can I use DS3231M+ as a substitute?

A: DS3231M+ is a 16-SOIC package RTC with I2C interface and ROHS3 compliance. However, the minimum supply voltage is 2.3V, which does not cover the original part's 1.3V lower limit. Additionally, timekeeping current is specified at 130µA to 200µA at 3.63V to 5.5V, significantly higher than the original 0.65µA to 0.85µA. This part is suitable only for applications with higher power budgets and minimum 2.3V supply voltage.

Q: What is the primary advantage of DS1375T+ over other substitutes?

A: DS1375T+ uses a compact 6-WDFN package with 16B memory and operates from 1.7V to 5.5V with 0.5µA timekeeping current. This option provides the smallest footprint among available substitutes while maintaining I2C interface and core RTC functionality. However, the 6-pin package requires significant PCB layout modification compared to the original 8-pin configuration.

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