PT7C4563UE Real Time Clock (RTC) IC Equivalent & Substitute Parts

Part Overview

The PT7C4563UE is a Real Time Clock (RTC) IC manufactured by Diodes Incorporated, designed for Clock/Calendar applications with I2C 2-Wire 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 currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	PT7C4563UE
Manufacturer	Diodes Incorporated
Category	Clock/Timing
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
Time Format	HH:MM:SS (24 hr)
Date Format	YY-MM-DD-dd
Features	Alarm, Leap Year, Square Wave Output
Current - Timekeeping (Max)	0.65µA ~ 0.85µA @ 3V ~ 5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the PT7C4563UE is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Interface: I2C, 2-Wire Serial (mandatory)
Package / Case: 8-TSSOP or 8-MSOP form factor (mandatory for direct PCB compatibility)
Voltage - Supply: Must encompass or overlap the 1.3V ~ 5.5V range
Time Format: HH:MM:SS capability (12/24 hr acceptable)
Date Format: YY-MM-DD-dd support
Operating Temperature: -40°C ~ 85°C range
Features: Alarm and Leap Year support (core functionality)
RoHS Status: ROHS3 Compliant

Substitute Parts by Package Compatibility:

Group 1: 8-TSSOP/8-MSOP Direct Replacements (Same Package)

1337DVGI8 (Renesas Electronics Corporation)
BU9873FVT-GE2 (Rohm Semiconductor)
DS1308U-3+ (Analog Devices Inc./Maxim Integrated)
DS1338U-33+T&R (Analog Devices Inc./Maxim Integrated)

Group 2: 8-SOIC Alternative Package (Different PCB Layout Required)

1339-31DCGI8 (Renesas Electronics Corporation)
BQ32000D (Texas Instruments)
DS1307ZN+ (Analog Devices Inc./Maxim Integrated)
DS1338C-3# (Analog Devices Inc./Maxim Integrated)
DS1338Z-18+T&R (Analog Devices Inc./Maxim Integrated)

Group 3: 8-UFDFN/8-VSON Alternative Package (Different PCB Layout Required)

BU9873NUX-TTR (Rohm Semiconductor)

Parameter Comparison

Part Number	Manufacturer	Package / Case	Voltage - Supply	Time Format	Date Format	Interface	Features	Current - Timekeeping (Max)	Operating Temperature	Product Status	RoHS Status
PT7C4563UE	Diodes Incorporated	8-TSSOP, 8-MSOP (0.118", 3.00mm)	1.3V ~ 5.5V	HH:MM:SS (24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Alarm, Leap Year, Square Wave Output	0.65µA ~ 0.85µA @ 3V ~ 5V	-40°C ~ 85°C	Obsolete	ROHS3 Compliant
1337DVGI8	Renesas Electronics Corporation	8-TSSOP, 8-MSOP (0.118", 3.00mm)	1.8V ~ 5.5V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Alarm, Leap Year, Square Wave Output	0.6µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	Active	ROHS3 Compliant
1339-31DCGI8	Renesas Electronics Corporation	8-SOIC (0.154", 3.90mm)	3.3V ~ 5.5V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Alarm, Leap Year, Square Wave Output, Trickle-Charger	200µA @ 3.63V ~ 5.5V	-40°C ~ 85°C	Active	ROHS3 Compliant
BQ32000D	Texas Instruments	8-SOIC (0.154", 3.90mm)	3V ~ 3.6V	HH:MM:SS (24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Leap Year, Square Wave Output, Trickle-Charger	100µA @ 3.3V	-40°C ~ 85°C	Active	ROHS3 Compliant
BU9873FVT-GE2	Rohm Semiconductor	8-TSSOP (0.173", 4.40mm)	1.8V ~ 5.5V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Alarm, Leap Year	1µA ~ 1.35µA @ 3V ~ 5.5V	-40°C ~ 85°C	Not For New Designs	ROHS3 Compliant
BU9873NUX-TTR	Rohm Semiconductor	8-UFDFN Exposed Pad	1.8V ~ 5.5V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Alarm, Leap Year	1µA ~ 1.35µA @ 3V ~ 5.5V	-40°C ~ 85°C	Not For New Designs	ROHS3 Compliant
DS1307ZN+	Analog Devices Inc./Maxim Integrated	8-SOIC (0.154", 3.90mm)	4.5V ~ 5.5V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Leap Year, NVSRAM, Square Wave Output	200µA @ 5V	-40°C ~ 85°C	Active	ROHS3 Compliant
DS1308U-3+	Analog Devices Inc./Maxim Integrated	8-TSSOP, 8-MSOP (0.118", 3.00mm)	2.7V ~ 5.5V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Leap Year, NVSRAM, Square Wave Output	Not specified	-40°C ~ 85°C	Active	ROHS3 Compliant
DS1338C-3#	Analog Devices Inc./Maxim Integrated	16-SOIC (0.295", 7.50mm)	2.7V ~ 5.5V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Leap Year, NVSRAM, Square Wave Output	200µA @ 3.3V	-40°C ~ 85°C	Active	ROHS3 Compliant
DS1338U-33+T&R	Analog Devices Inc./Maxim Integrated	8-TSSOP, 8-MSOP (0.118", 3.00mm)	3V ~ 5.5V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Leap Year, NVSRAM, Square Wave Output	125µA ~ 200µA @ 3.63V ~ 5.5V	-40°C ~ 85°C	Active	ROHS3 Compliant
DS1338Z-18+T&R	Analog Devices Inc./Maxim Integrated	8-SOIC (0.154", 3.90mm)	1.71V ~ 5.5V	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	Leap Year, NVSRAM, Square Wave Output	100µA @ 1.89V	-40°C ~ 85°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Package Replacement (Recommended for Minimal PCB Changes):

The 1337DVGI8 from Renesas Electronics Corporation and DS1338U-33+T&R from Analog Devices Inc./Maxim Integrated are the primary candidates for direct replacement in the 8-TSSOP/8-MSOP package. Both parts maintain active product status and ROHS3 compliance. The 1337DVGI8 offers the lowest timekeeping current at 0.6µA and supports the full voltage range down to 1.8V. The DS1338U-33+T&R provides NVSRAM functionality and operates from 3V to 5.5V with active status.

Alternative Package Solutions (Requires PCB Layout Modification):

For designs that can accommodate package changes, the DS1338Z-18+T&R offers the widest voltage range (1.71V ~ 5.5V) in an 8-SOIC package with active product status. The BQ32000D from Texas Instruments provides a narrower voltage window (3V ~ 3.6V) but features lower timekeeping current at 100µA and trickle-charger functionality.

Obsolescence Mitigation:

All recommended substitute parts carry active product status, ensuring long-term availability and design support. The PT7C4563UE's obsolete classification necessitates transition to one of these active alternatives. Parts marked "Not For New Designs" (BU9873FVT-GE2, BU9873NUX-TTR) should be avoided for new production designs despite technical compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different package than the PT7C4563UE?

A: Package changes require PCB layout modifications. The PT7C4563UE uses 8-TSSOP/8-MSOP (0.118", 3.00mm width). Direct pin-compatible replacements in the same package are 1337DVGI8, DS1308U-3+, and DS1338U-33+T&R. Alternative packages such as 8-SOIC or 8-UFDFN require new PCB design and cannot be used as drop-in replacements.

Q: What is the minimum voltage requirement for substitute parts?

A: The PT7C4563UE operates from 1.3V minimum. Substitute parts vary: 1337DVGI8 starts at 1.8V, DS1308U-3+ at 2.7V, DS1338Z-18+T&R at 1.71V, and BQ32000D at 3V. Verify your application's minimum supply voltage against the selected substitute part's specification.

Q: Do all substitute parts support 24-hour time format?

A: The PT7C4563UE uses 24-hour format exclusively. Most substitutes support both 12/24-hour formats, providing backward compatibility. BQ32000D supports 24-hour format only. Verify firmware or software compatibility with the selected part's time format capabilities.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts carry ROHS3 Compliant status, matching the PT7C4563UE's environmental compliance classification.

Q: Which substitute part has the lowest power consumption?

A: The 1337DVGI8 offers the lowest timekeeping current at 0.6µA when operating in the 1.3V to 1.8V range. For higher voltage operation, the DS1338Z-18+T&R provides 100µA at 1.89V, and the BQ32000D delivers 100µA at 3.3V.

Q: Can I use parts marked "Not For New Designs"?

A: BU9873FVT-GE2 and BU9873NUX-TTR are marked "Not For New Designs" by their manufacturers. These parts are suitable only for legacy design support or maintenance of existing products. New designs should use parts with Active product status.

Q: What is the difference between NVSRAM and non-NVSRAM RTC devices?

A: NVSRAM (Non-Volatile Static RAM) provides additional user-accessible memory for data storage beyond timekeeping. The PT7C4563UE does not include NVSRAM. Substitutes with NVSRAM (DS1307ZN+, DS1308U-3+, DS1338 series) offer expanded functionality but are functionally compatible if the additional memory is not utilized.

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