PT7C4372AWEX Equivalent & Substitute Parts

Part Overview

The PT7C4372AWEX is a Real Time Clock (RTC) IC with Clock/Calendar functionality, manufactured by Diodes Incorporated. This device operates via I2C 2-Wire Serial interface and is packaged in 8-SOIC (0.154", 3.90mm Width) surface mount configuration. The part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device supports 12/24-hour time format, YY-MM-DD-dd date format, and includes alarm and leap year features. Operating voltage ranges from 1.8V to 6V with timekeeping current of 0.8µA at 3V.

Key Parameters

Parameter	PT7C4372AWEX
Manufacturer	Diodes Incorporated
Category	Clock/Timing
Type	Clock/Calendar
Package / Case	8-SOIC (0.154", 3.90mm Width)
Interface	I2C, 2-Wire Serial
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Features	Alarm, Leap Year
Voltage - Supply	1.8V ~ 6V
Current - Timekeeping (Max)	0.8µA @ 3V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the PT7C4372AWEX is determined by the following critical parameters:

Primary Substitution Criteria:

Interface: I2C, 2-Wire Serial (mandatory match)
Time Format: HH:MM:SS with 12/24-hour support (mandatory match)
Date Format: YY-MM-DD-dd (mandatory match)
Features: Alarm and Leap Year support (mandatory match)
Operating Temperature: -40°C ~ 85°C (mandatory match)
Voltage Supply Range: Must encompass or overlap with 1.8V ~ 6V

Package Compatibility:

Primary substitute group: 8-SOIC (0.154", 3.90mm Width) — direct pin-compatible replacement
Secondary substitute group: 8-TSSOP/8-MSOP (0.118", 3.00mm Width) — functionally equivalent, different footprint
Tertiary substitute group: Other packages (8-DIP, 16-SOIC) — functionally equivalent, significant layout changes required

Active vs. Obsolete Status: The PT7C4372AWEX is Obsolete. All recommended substitutes are Active products, ensuring long-term availability and supply chain stability.

Parameter Comparison

Parameter	PT7C4372AWEX	1337DVGI	1339-31DCGI8	BQ32000DR	BQ32002DR	DS1337U+T&R
Manufacturer	Diodes Inc.	Renesas	Renesas	Texas Instruments	Texas Instruments	Analog Devices/Maxim
Package / Case	8-SOIC	8-TSSOP/8-MSOP	8-SOIC	8-SOIC	8-SOIC	8-TSSOP/8-MSOP
Interface	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire
Time Format	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (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
Features	Alarm, Leap Year	Alarm, Leap Year, Square Wave Output	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Leap Year, Square Wave Output, Trickle-Charger	Leap Year, Square Wave Output, Trickle-Charger	Alarm, Leap Year, Square Wave Output
Voltage - Supply	1.8V ~ 6V	1.8V ~ 5.5V	3.3V ~ 5.5V	3V ~ 3.6V	3V ~ 3.6V	1.8V ~ 5.5V
Current - Timekeeping (Max)	0.8µA @ 3V	0.6µA @ 1.3V ~ 1.8V	200µA @ 3.63V ~ 5.5V	100µA @ 3.3V	65µA @ 3.3V	0.6µA @ 1.3V ~ 1.8V
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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

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

1339-31DCGI8 (Renesas) is the primary direct replacement for PT7C4372AWEX. Both devices use 8-SOIC packaging with identical footprint. The 1339-31DCGI8 is Active status with unlimited MSL rating, providing superior supply chain stability. Voltage supply range of 3.3V ~ 5.5V is narrower than the original but covers standard operating conditions. Additional features include Square Wave Output and Trickle-Charger functionality.

BQ32000DR and BQ32002DR (Texas Instruments) are 8-SOIC pin-compatible alternatives. Both are Active status with unlimited MSL rating. Supply voltage is restricted to 3V ~ 3.6V, requiring design verification for compatibility. BQ32002DR offers lower timekeeping current (65µA) compared to BQ32000DR (100µA). Both lack 12-hour time format support, supporting only 24-hour format.

Functionally Equivalent Substitutes (8-TSSOP/8-MSOP Package):

1337DVGI (Renesas) and DS1337U+T&R (Analog Devices/Maxim) provide functional equivalence with different surface mount footprint. Both support full 12/24-hour time format and alarm functionality. Supply voltage ranges (1.8V ~ 5.5V) closely match the original specification. Timekeeping current is significantly lower (0.6µA at 1.3V ~ 1.8V). Both are Active status with unlimited MSL rating. PCB layout modification is required for package transition.

Compliance & Availability:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original device certifications. Active product status ensures long-term availability and manufacturing support, addressing the obsolescence of the PT7C4372AWEX.

Frequently Asked Questions (FAQ)

Q: Can I use BQ32000DR or BQ32002DR as direct replacements?

A: BQ32000DR and BQ32002DR are pin-compatible in 8-SOIC packaging but have critical functional differences. Both support only 24-hour time format, whereas PT7C4372AWEX supports 12/24-hour format. Supply voltage is restricted to 3V ~ 3.6V, narrower than the original 1.8V ~ 6V range. Design verification is required to confirm compatibility with your application's time format requirements and voltage supply specifications.

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

A: Both are 8-pin surface mount packages with identical electrical functionality but different physical dimensions and PCB footprints. 8-SOIC (0.154", 3.90mm Width) is wider than 8-TSSOP/8-MSOP (0.118", 3.00mm Width). Direct footprint substitution is not possible; PCB layout modification is required when transitioning between these packages.

Q: Why is 1339-31DCGI8 recommended over other substitutes?

A: 1339-31DCGI8 provides direct 8-SOIC pin-compatible replacement with no PCB layout changes required. It is Active status with unlimited MSL rating, ensuring superior supply chain stability compared to the Obsolete PT7C4372AWEX. Voltage supply range of 3.3V ~ 5.5V covers standard operating conditions. Additional features (Square Wave Output, Trickle-Charger) provide enhanced functionality without compromising compatibility.

Q: Are there supply voltage compatibility concerns?

A: PT7C4372AWEX operates from 1.8V ~ 6V. Most substitutes operate within narrower ranges: 1337DVGI and DS1337U+T&R support 1.8V ~ 5.5V (compatible); 1339-31DCGI8 supports 3.3V ~ 5.5V (compatible with standard 3.3V/5V systems); BQ32000DR and BQ32002DR support only 3V ~ 3.6V (requires verification for 1.8V applications). Confirm your application's supply voltage before selection.

Q: What does MSL rating mean for component selection?

A: MSL (Moisture Sensitivity Level) indicates how long a component can be exposed to moisture before soldering. PT7C4372AWEX has MSL 3 (168 hours maximum). All recommended substitutes have MSL 1 (unlimited exposure), providing more flexible handling and storage conditions during manufacturing.

Q: Do all substitutes support alarm functionality?

A: No. PT7C4372AWEX, 1337DVGI, 1339-31DCGI8, and DS1337U+T&R all support alarm functionality. BQ32000DR and BQ32002DR do not include alarm features. Confirm alarm requirement before selecting BQ32000DR or BQ32002DR variants.

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