PT7C4337AWEX Equivalent & Substitute Parts

Part Overview

The PT7C4337AWEX is a Real Time Clock (RTC) IC Clock/Calendar with I2C 2-Wire Serial interface manufactured by Diodes Incorporated. This device operates across a wide supply voltage range of 1.8V to 5.5V and features alarm functionality, leap year support, and square wave output capabilities. The part is actively produced and widely available with 7,923 units in current inventory.

Substitute parts are necessary when the PT7C4337AWEX becomes unavailable, when design requirements demand alternative package formats, or when application specifications require different electrical characteristics such as modified supply voltage ranges, lower power consumption, or expanded memory capacity.

Key Parameters

Parameter	PT7C4337AWEX
Manufacturer	Diodes Incorporated
Package / Case	8-SOIC (0.154", 3.90mm Width)
Interface	I2C, 2-Wire Serial
Type	Clock/Calendar
Voltage - Supply	1.8V ~ 5.5V
Current - Timekeeping (Max)	0.8µA @ 1.3V ~ 1.8V
Operating Temperature	-40°C ~ 85°C
Features	Alarm, Leap Year, Square Wave Output
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the PT7C4337AWEX is determined by the following critical parameters:

Interface Compatibility: All substitute parts must support I2C 2-Wire Serial communication to maintain firmware and hardware compatibility.

Functional Features: Substitute parts must provide Clock/Calendar functionality with support for alarm, leap year calculation, and square wave output.

Voltage Supply Range: The substitute must operate within or encompass the 1.8V to 5.5V supply range. Parts with narrower ranges may be acceptable if the application operates within the overlapping voltage window.

Time and Date Format: All candidates must support HH:MM:SS (12/24 hour) time format and YY-MM-DD-dd date format.

Operating Temperature: The substitute must support the -40°C to 85°C operating temperature range.

Package Compatibility: While the primary PT7C4337AWEX uses 8-SOIC packaging, substitutes in alternative surface-mount packages (8-MSOP, 8-TSSOP, 10-SMD Module, 16-SOIC) are acceptable if the PCB layout can accommodate the different footprint.

Product Status: Active status is preferred for long-term availability, though parts marked "Not For New Designs" may serve as temporary substitutes in existing production runs.

Parameter Comparison

Parameter	PT7C4337AWEX	AB-RTCMC-32.768KHZ-B5ZE-S3-T	BU9873FVM-GTTR	DS1307Z+	DS1337C#	DS1337S+T&R	DS1338Z-18+	DS1339U-33+T&R	DS1342U+T&R	DS3231M+
Manufacturer	Diodes Inc.	Abracon LLC	Rohm Semiconductor	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim
Package / Case	8-SOIC	10-SMD Module	8-MSOP	8-SOIC	16-SOIC	8-SOIC	8-SOIC	8-MSOP	8-MSOP	16-SOIC
Interface	I2C, 2-Wire	I2C, 2-Wire	I2C, 2-Wire	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	1.2V ~ 5.5V	1.8V ~ 5.5V	4.5V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.71V ~ 5.5V	2.97V ~ 5.5V	1.8V ~ 5.5V	2.3V ~ 5.5V
Current - Timekeeping (Max)	0.8µA @ 1.3V-1.8V	0.5µA @ 2V-5V	1µA-1.35µA @ 3V-5.5V	200µA @ 5V	0.6µA @ 1.3V-1.8V	0.6µA @ 1.3V-1.8V	100µA @ 1.89V	200µA @ 5.5V	0.6µA-0.7µA @ 3V-5V	130µA-200µA @ 3.63V-5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°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
Features	Alarm, Leap Year, Square Wave	Alarm, Leap Year, Square Wave	Alarm, Leap Year	Leap Year, NVSRAM, Square Wave	Alarm, Leap Year, Square Wave	Alarm, Leap Year, Square Wave	Leap Year, NVSRAM, Square Wave	Alarm, Leap Year, Square Wave, Trickle-Charger	Alarm, Leap Year, Square Wave	Alarm, Leap Year, Square Wave
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)	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	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
Product Status	Active	Active	Not For New Designs	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (8-SOIC Package, Direct Footprint Match):

DS1337S+T&R and DS1338Z-18+ are the most direct substitutes, offering identical 8-SOIC packaging with full feature compatibility. Both are actively produced and ROHS3 compliant. DS1337S+T&R provides the closest electrical match with 0.6µA timekeeping current at low voltage. DS1338Z-18+ offers expanded supply voltage range down to 1.71V and includes NVSRAM memory.

Alternative Package Substitutes:

DS1339U-33+T&R and DS1342U+T&R use 8-MSOP packaging, requiring PCB layout modification but offering compact form factor. Both maintain full feature compatibility and active production status. DS1342U+T&R provides superior low-voltage performance with 0.6µA-0.7µA timekeeping current.

Extended Feature Substitutes:

DS3231M+ operates in 16-SOIC packaging and includes integrated temperature-compensated crystal oscillator, delivering enhanced frequency stability. This part is suitable for applications requiring higher accuracy but demands PCB redesign.

Module-Based Substitute:

AB-RTCMC-32.768KHZ-B5ZE-S3-T from Abracon LLC provides a complete RTC module in 10-SMD format with integrated crystal. This option suits applications where external crystal management is undesirable.

Legacy Consideration:

BU9873FVM-GTTR is marked "Not For New Designs" and should be used only for existing production continuity or repair applications.

Voltage-Constrained Applications:

DS1307Z+ operates only within 4.5V to 5.5V supply range and is unsuitable for low-voltage applications below 4.5V. This part is acceptable only for fixed 5V systems.

Frequently Asked Questions (FAQ)

Q: Can DS1307Z+ replace PT7C4337AWEX in a 3.3V application?

A: No. DS1307Z+ requires 4.5V minimum supply voltage and cannot operate at 3.3V. The PT7C4337AWEX and most alternative substitutes support 1.8V to 5.5V range, making them suitable for 3.3V systems.

Q: What is the primary difference between DS1337S+T&R and DS1338Z-18+?

A: Both use 8-SOIC packaging and support identical interfaces. DS1338Z-18+ includes 56 bytes of NVSRAM (non-volatile static RAM) for data storage and operates down to 1.71V supply voltage. DS1337S+T&R lacks integrated memory but achieves lower timekeeping current at ultra-low voltages.

Q: Is the AB-RTCMC-32.768KHZ-B5ZE-S3-T module compatible with existing PT7C4337AWEX firmware?

A: The module maintains I2C 2-Wire Serial interface compatibility and identical time/date format support. However, the 10-SMD Module package requires different PCB footprint design. Firmware compatibility depends on specific register mapping and command set alignment, which must be verified against application documentation.

Q: Why does BU9873FVM-GTTR show "Not For New Designs" status?

A: This designation indicates the manufacturer has discontinued active development and recommends alternative parts for new applications. BU9873FVM-GTTR remains available for existing production support but should not be selected for new designs due to uncertain long-term availability.

Q: What is the impact of switching from 8-SOIC to 8-MSOP packaging?

A: Both packages are surface-mount formats with different physical dimensions. 8-MSOP (0.110", 2.80mm width) is narrower than 8-SOIC (0.154", 3.90mm width). PCB layout and footprint must be redesigned, but electrical functionality remains identical. Thermal characteristics may differ slightly due to package geometry.

Q: Does DS3231M+ require external crystal oscillator?

A: No. DS3231M+ integrates a temperature-compensated crystal oscillator internally, eliminating the need for external crystal components. This reduces component count and improves frequency stability across temperature variations.

Q: Can I use DS1339U-33+T&R in a battery-backed application?

A: Yes. DS1339U-33+T&R supports battery supply voltage range of 1.3V to 3.7V and includes trickle-charger functionality for rechargeable battery management. This makes it suitable for backup power applications.

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