PT7C4337LE Real Time Clock (RTC) IC Equivalent & Substitute Parts

Part Overview

The PT7C4337LE is a Real Time Clock (RTC) IC manufactured by Diodes Incorporated, designed for Clock/Calendar applications with I2C, 2-Wire Serial interface. This device features alarm functionality, leap year support, and square wave output capabilities in an 8-TSSOP package (0.173", 4.40mm Width). The part is currently classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	PT7C4337LE
Manufacturer	Diodes Incorporated
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Voltage - Supply	1.8V ~ 5.5V
Current - Timekeeping (Max)	0.8µA @ 1.3V ~ 1.8V
Operating Temperature	-40°C ~ 85°C
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Features	Alarm, Leap Year, Square Wave Output
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the PT7C4337LE is determined by the following critical parameters:

Primary Substitution Criteria:

Interface: I2C, 2-Wire Serial (mandatory match)
Time Format: HH:MM:SS (12/24 hr) support
Date Format: YY-MM-DD-dd support
Features: Alarm, Leap Year, Square Wave Output
Operating Temperature: -40°C ~ 85°C
Voltage Supply Range: 1.8V ~ 5.5V (or compatible subset)
RoHS3 Compliance

Package Compatibility Considerations:

Primary package: 8-TSSOP (0.173", 4.40mm Width)
Alternative packages: 8-MSOP (0.118", 3.00mm Width), 8-VSSOP (0.110", 2.80mm Width), 8-SOIC (0.154", 3.90mm Width)
All alternatives are surface mount, 8-pin configurations with compatible pinouts for I2C RTC applications

Substitute parts are grouped into two categories: Direct Equivalents (matching all core parameters) and Functional Alternatives (meeting core requirements with minor parameter variations or enhanced features).

Parameter Comparison

Parameter	PT7C4337LE	DS1337U+	1339-31DVGI8	BU9873FVM-GTTR	DS1308U-18+	DS1339U-33+T&R	DS1375T+
Manufacturer	Diodes Inc.	Analog Devices/Maxim	Renesas	Rohm	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim
Product Status	Obsolete	Active	Active	Not For New Designs	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
Voltage - Supply	1.8V ~ 5.5V	1.8V ~ 5.5V	3.3V ~ 5.5V	1.8V ~ 5.5V	1.71V ~ 5.5V	2.97V ~ 5.5V	1.7V ~ 5.5V
Current - Timekeeping (Max)	0.8µA @ 1.3V ~ 1.8V	0.6µA @ 1.3V ~ 1.8V	200µA @ 3.63V ~ 5.5V	1µA ~ 1.35µA @ 3V ~ 5.5V	100µA @ 1.89V ~ 5.5V	200µA @ 5.5V	0.5µA @ 1.7V ~ 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 (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	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	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Alarm, Leap Year	Leap Year, NVSRAM, Square Wave Output	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Alarm, Leap Year, Square Wave Output
Package / Case	8-TSSOP (0.173", 4.40mm)	8-TSSOP, 8-MSOP (0.118", 3.00mm)	8-TSSOP, 8-MSOP (0.118", 3.00mm)	8-VSSOP, 8-MSOP (0.110", 2.80mm)	8-TSSOP, 8-MSOP (0.118", 3.00mm)	8-TSSOP, 8-MSOP (0.118", 3.00mm)	6-WDFN Exposed Pad
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Recommended for Replacement):

DS1337U+ (Analog Devices Inc./Maxim Integrated) is the primary recommended substitute. It matches the PT7C4337LE across all critical parameters: I2C interface, 1.8V ~ 5.5V supply voltage, -40°C ~ 85°C operating temperature, and identical feature set (Alarm, Leap Year, Square Wave Output). The DS1337U+ is Active status with ROHS3 compliance and MSL 1 rating. Package options include 8-TSSOP and 8-MSOP configurations. Current consumption is superior at 0.6µA versus 0.8µA.

DS1308U-18+ (Analog Devices Inc./Maxim Integrated) provides an alternative with extended supply voltage range (1.71V ~ 5.5V) and includes NVSRAM memory (56B). Active status, ROHS3 compliant, MSL 1 rating. Available in 8-TSSOP and 8-MSOP packages.

DS1339U-33+T&R (Analog Devices Inc./Maxim Integrated) offers enhanced functionality with Trickle-Charger feature and battery backup support (1.3V ~ 3.7V). Active status, ROHS3 compliant, MSL 1 rating. Minimum supply voltage is 2.97V, which may limit low-voltage applications.

Tier 2 - Functional Alternatives:

1339-31DVGI8 (Renesas Electronics Corporation) meets core requirements with Trickle-Charger feature. Active status, ROHS3 compliant. MSL 3 rating (168 Hours) requires controlled storage. Supply voltage minimum is 3.3V, limiting low-voltage compatibility. Current consumption is significantly higher at 200µA.

DS1375T+ (Analog Devices Inc./Maxim Integrated) provides the lowest timekeeping current (0.5µA) with 16B memory in a compact 6-WDFN package. Active status, ROHS3 compliant, MSL 1 rating. Package change requires PCB layout modification.

Not Recommended for New Designs:

BU9873FVM-GTTR (Rohm Semiconductor) is classified as "Not For New Designs" and should be avoided for new applications despite meeting functional requirements.

Frequently Asked Questions (FAQ)

Q: Can DS1337U+ directly replace PT7C4337LE without PCB modifications?

A: DS1337U+ is available in both 8-TSSOP and 8-MSOP packages. The 8-TSSOP variant provides direct footprint compatibility with PT7C4337LE. Pin configuration and I2C protocol are identical, enabling direct substitution without firmware changes.

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

A: Both are 8-pin surface mount packages with identical pinouts for RTC applications. 8-TSSOP measures 0.173" width (4.40mm), while 8-MSOP measures 0.118" width (3.00mm). The MSOP variant is more compact. Electrical performance is identical; selection depends on PCB layout constraints.

Q: Why does 1339-31DVGI8 have higher timekeeping current (200µA) than PT7C4337LE (0.8µA)?

A: The 1339-31DVGI8 current specification is measured at 3.63V ~ 5.5V supply range, whereas PT7C4337LE is specified at 1.3V ~ 1.8V. Current consumption varies with supply voltage. At lower voltages, the 1339-31DVGI8 would exhibit lower current draw, but this operating point is not specified in the datasheet.

Q: Is MSL 3 rating (168 Hours) acceptable for production environments?

A: MSL 3 requires controlled storage conditions with moisture exposure limited to 168 hours after package opening. This is acceptable for controlled manufacturing environments but requires proper handling procedures. MSL 1 parts (unlimited moisture exposure) are preferred for less controlled environments.

Q: Can I use DS1375T+ as a drop-in replacement?

A: DS1375T+ requires PCB layout changes due to its 6-WDFN package versus the 8-pin TSSOP/MSOP of PT7C4337LE. Pinout is different. However, it offers superior timekeeping current (0.5µA) and is recommended for space-constrained designs where layout modification is feasible.

Q: What is the significance of Trickle-Charger feature in DS1339U-33+T&R and 1339-31DVGI8?

A: Trickle-Charger enables slow charging of backup batteries during normal operation, extending battery life in applications requiring continuous timekeeping during power loss. This feature is not present in PT7C4337LE or DS1337U+, making these parts suitable only for applications with dedicated battery backup circuits.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant, matching the environmental compliance of PT7C4337LE. All parts are also REACH Unaffected and classified as EAR99 for export purposes.

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