PT7C4563LE Equivalent & Substitute Parts

Part Overview

The PT7C4563LE is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Diodes Incorporated. This device operates as a 2-Wire Serial I2C interface component in an 8-TSSOP surface mount package. The part is classified as Obsolete, making substitute components necessary for new designs and ongoing production requirements. Equivalent alternatives must maintain functional compatibility across I2C communication protocol, time/date format support, operating temperature range, and supply voltage specifications.

Key Parameters

Parameter	PT7C4563LE
Manufacturer	Diodes Incorporated
Product Status	Obsolete
Package Type	8-TSSOP (0.173", 4.40mm Width)
Interface	I2C, 2-Wire Serial
Time Format	HH:MM:SS (24 hr)
Date Format	YY-MM-DD-dd
Supply Voltage	1.3V ~ 5.5V
Timekeeping Current (Max)	0.65µA ~ 0.85µA @ 3V ~ 5V
Operating Temperature	-40°C ~ 85°C
Features	Alarm, Leap Year, Square Wave Output
RoHS Status	ROHS3 Compliant
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution logic is based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

I2C/2-Wire Serial interface protocol
Time format support (24-hour capability required)
Date format support (YY-MM-DD-dd)
Operating temperature range (-40°C ~ 85°C minimum)
Supply voltage overlap (minimum 1.3V ~ 5.5V range or compatible subset)
Surface mount technology
RoHS3 compliance

Package Considerations: Substitute parts are grouped by package type. The original PT7C4563LE uses 8-TSSOP packaging. Alternatives include 8-SOIC, 8-MSOP, 16-QFN, and module-based packages. Package differences require PCB layout modifications but do not affect electrical functionality when pin assignments are compatible.

Feature Alignment: All substitute parts maintain Alarm, Leap Year, and Square Wave Output capabilities. Additional features (SRAM, Trickle-Charger, Watchdog Timer) in some alternatives provide enhanced functionality without compromising baseline compatibility.

Parameter Comparison

Part Number	Manufacturer	Package	Status	Interface	Time Format	Supply Voltage	Timekeeping Current (Max)	Operating Temp	Features
PT7C4563LE	Diodes Inc.	8-TSSOP	Obsolete	I2C, 2-Wire	HH:MM:SS (24 hr)	1.3V ~ 5.5V	0.65µA ~ 0.85µA @ 3V ~ 5V	-40°C ~ 85°C	Alarm, Leap Year, Square Wave
1337AGDCGI	Renesas Electronics	8-SOIC	Active	I2C, 2-Wire	HH:MM:SS (12/24 hr)	1.8V ~ 5.5V	0.3µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	Alarm, Leap Year, Square Wave
1337GDCGI8	Renesas Electronics	8-SOIC	Active	I2C, 2-Wire	HH:MM:SS (12/24 hr)	1.8V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	Alarm, Leap Year, Square Wave
AB-RTCMC-32.768KHZ-B5GA-S3-T	Abracon LLC	10-SMD Module	Active	I2C, 2-Wire	HH:MM:SS (24 hr)	1.2V ~ 5.5V	0.45µA ~ 0.55µA @ 2V ~ 5V	-40°C ~ 85°C	Alarm, Leap Year, Square Wave
AB0805-T3	Abracon LLC	16-VFQFN	Active	I2C, 2-Wire	HH:MM:SS:hh	1.7V ~ 3.6V	0.17µA ~ 0.22µA @ 1.8V ~ 3V	-40°C ~ 85°C	Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog
AB1805-T3	Abracon LLC	16-VFQFN	Active	I2C, 2-Wire	HH:MM:SS:hh	1.7V ~ 3.6V	0.17µA ~ 0.22µA @ 1.8V ~ 3V	-40°C ~ 85°C	Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog
BQ32002D	Texas Instruments	8-SOIC	Active	I2C, 2-Wire	HH:MM:SS (24 hr)	3V ~ 3.6V	200µA @ 3.3V	-40°C ~ 85°C	Leap Year, Square Wave, Trickle-Charger
BU9873FVM-GTTR	Rohm Semiconductor	8-MSOP	Not For New Designs	I2C, 2-Wire	HH:MM:SS (12/24 hr)	1.8V ~ 5.5V	1µA ~ 1.35µA @ 3V ~ 5.5V	-40°C ~ 85°C	Alarm, Leap Year
DS1308U-18+T	Analog Devices/Maxim	8-TSSOP/8-MSOP	Active	I2C, 2-Wire	HH:MM:SS (12/24 hr)	1.71V ~ 5.5V	100µA @ 200µA @ 1.89V ~ 5.5V	-40°C ~ 85°C	Leap Year, NVSRAM, Square Wave
DS1308U-3+	Analog Devices/Maxim	8-TSSOP/8-MSOP	Active	I2C, 2-Wire	HH:MM:SS (12/24 hr)	2.7V ~ 5.5V	Not specified	-40°C ~ 85°C	Leap Year, NVSRAM, Square Wave
DS1308U-3+T	Analog Devices/Maxim	8-TSSOP/8-MSOP	Active	I2C, 2-Wire	HH:MM:SS (12/24 hr)	2.7V ~ 5.5V	Not specified	-40°C ~ 85°C	Leap Year, NVSRAM, Square Wave

Engineering Selection Recommendations

Direct Package Equivalents (8-TSSOP/8-MSOP): DS1308U-18+T, DS1308U-3+, and DS1308U-3+T from Analog Devices/Maxim Integrated are Active status components available in compatible 8-TSSOP/8-MSOP packages. These parts maintain I2C interface compatibility and -40°C ~ 85°C operating temperature alignment. DS1308U-18+T supports the full 1.71V ~ 5.5V supply voltage range, matching the original part's lower voltage threshold. All three variants are ROHS3 compliant.

8-SOIC Package Alternatives: Renesas Electronics 1337AGDCGI and 1337GDCGI8 are Active status RTC components in 8-SOIC packaging. Both support 12/24-hour time format and maintain I2C 2-Wire Serial interface. Supply voltage range begins at 1.8V, which is compatible with the original part's 1.3V ~ 5.5V specification for applications operating above 1.8V. These parts are ROHS3 compliant with unlimited moisture sensitivity level.

Low-Power Module Solution: Abracon LLC AB-RTCMC-32.768KHZ-B5GA-S3-T is an Active status module-based RTC with 10-SMD packaging. This component offers the lowest timekeeping current (0.45µA ~ 0.55µA) and extends supply voltage support to 1.2V minimum. It maintains 24-hour time format and full feature set (Alarm, Leap Year, Square Wave Output). Module integration may simplify board-level design.

Enhanced Feature Alternatives: Abracon LLC AB0805-T3 and AB1805-T3 are Active status 16-VFQFN components with integrated 256B SRAM, Trickle-Charger, and Watchdog Timer. These parts offer the lowest timekeeping current (0.17µA ~ 0.22µA) but operate within 1.7V ~ 3.6V supply range, requiring circuit redesign for applications requiring the original part's 5.5V maximum rating.

Not Recommended for New Designs: BU9873FVM-GTTR (Rohm Semiconductor) carries "Not For New Designs" status and should not be selected for new development projects despite Active inventory availability.

Limited Compatibility: BQ32002D (Texas Instruments) operates within 3V ~ 3.6V supply range, which does not accommodate the original part's 1.3V minimum specification. This part is suitable only for applications with fixed 3.3V supply rails.

Frequently Asked Questions (FAQ)

Q: Can I directly replace PT7C4563LE with any of these substitute parts? A: Direct replacement depends on package compatibility and supply voltage requirements. DS1308U-18+T, DS1308U-3+, and DS1308U-3+T are available in compatible 8-TSSOP/8-MSOP packages. Other alternatives require PCB layout modifications due to different package types (8-SOIC, 16-QFN, Module). All substitutes maintain I2C interface and -40°C ~ 85°C operating temperature compatibility.

Q: What is the primary reason for finding a substitute for PT7C4563LE? A: PT7C4563LE is classified as Obsolete. Substitute components ensure design continuity, supply chain reliability, and access to Active status parts with ongoing manufacturer support.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant, matching the original part's environmental compliance status.

Q: Which substitute offers the lowest power consumption? A: Abracon LLC AB0805-T3 and AB1805-T3 offer the lowest timekeeping current at 0.17µA ~ 0.22µA @ 1.8V ~ 3V. However, these parts operate within 1.7V ~ 3.6V supply range and are not suitable for applications requiring 5.5V operation.

Q: Can I use a substitute part with a different package type? A: Yes, but PCB layout modifications are required. Package changes affect pin pitch, footprint dimensions, and board routing. Electrical functionality remains compatible when I2C interface pins are properly mapped.

Q: Which substitute maintains the exact same supply voltage range as PT7C4563LE? A: No substitute maintains the identical 1.3V ~ 5.5V range. DS1308U-18+T comes closest with 1.71V ~ 5.5V support. Abracon AB-RTCMC-32.768KHZ-B5GA-S3-T extends to 1.2V minimum but is limited to 5.5V maximum.

Q: What is the difference between 12/24-hour and 24-hour time format support? A: 24-hour format displays time as 00:00:00 to 23:59:59. 12/24-hour format allows software selection between 12-hour (with AM/PM indicator) and 24-hour modes. Both formats are compatible with applications designed for 24-hour operation.

Q: Are there inventory considerations for substitute selection? A: Yes. Abracon AB-RTCMC-32.768KHZ-B5GA-S3-T has the highest inventory (2,787 pcs), followed by AB0805-T3 (21,300 pcs). Renesas 1337GDCGI8 offers 1,087 pcs. Inventory levels support production volume requirements across different substitution scenarios.

Q: Which substitute is recommended for new designs? A: Renesas Electronics 1337AGDCGI or 1337GDCGI8 are recommended for new designs. Both are Active status, ROHS3 compliant, and available in standard 8-SOIC packaging with established supply chain support. DS1308U-18+T is also suitable if 8-TSSOP/8-MSOP package compatibility is required.

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