PT7C43390AWEX Equivalent & Substitute Parts

Part Overview

The PT7C43390AWEX 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 1.35V to 5.5V and features alarm functionality, leap year support, and square wave output capabilities. The part is housed in an 8-SOIC package and maintains an active product status with full RoHS3 compliance.

Substitute parts are necessary when the original PT7C43390AWEX becomes unavailable, when inventory constraints require alternative sourcing, or when design requirements necessitate different electrical characteristics or package configurations while maintaining functional compatibility.

Key Parameters

Parameter	PT7C43390AWEX
Manufacturer	Diodes Incorporated
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
Voltage - Supply	1.35V ~ 5.5V
Current - Timekeeping (Max)	0.6µA ~ 0.7µA @ 3V ~ 5V
Operating Temperature	-40°C ~ 85°C
Features	Alarm, Leap Year, Square Wave Output
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Primary Compatibility Criteria:

Interface type: I2C, 2-Wire Serial (mandatory match)
Time and date format support: HH:MM:SS (12/24 hr) and YY-MM-DD-dd (mandatory match)
Operating temperature range: -40°C ~ 85°C (mandatory match)
RoHS3 compliance status (mandatory match)

Secondary Compatibility Criteria:

Supply voltage range overlap with 1.35V ~ 5.5V
Package form factor (8-SOIC preferred for direct pin compatibility)
Current consumption characteristics
Feature set alignment (Alarm, Leap Year, Square Wave Output)

Substitute parts are grouped into two categories:

Category A - Direct Pin-Compatible Substitutes (8-SOIC Package): Parts that maintain identical package geometry and pinout, allowing direct PCB replacement without layout modifications. These include BQ32000DR, DS1338Z-3+, DS1338Z-33+, ISL12057IBZ, and ISL12026AIVZ.

Category B - Functional Equivalents (Alternative Packages): Parts that provide equivalent functionality but utilize different package configurations (8-TSSOP, 8-MSOP, 16-SOIC, 20-SOIC). These require PCB layout modifications and include DS1339U-33+, DS3231M+, ISL12022MAIBZ-T, ISL1208IRT8Z-TK, and ISL1208IU8Z-T7A.

Parameter Comparison

Parameter	PT7C43390AWEX	BQ32000DR	DS1338Z-3+	DS1338Z-33+	DS1339U-33+	DS3231M+	ISL12022MAIBZ-T	ISL12026AIVZ	ISL12057IBZ	ISL1208IRT8Z-TK	ISL1208IU8Z-T7A
Interface	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial
Time Format	HH:MM:SS (12/24 hr)	HH:MM:SS (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	YY-MM-DD-dd
Voltage - Supply	1.35V ~ 5.5V	3V ~ 3.6V	2.7V ~ 5.5V	3V ~ 5.5V	2.97V ~ 5.5V	2.3V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	1.8V ~ 3.6V	2.7V ~ 5.5V	2.7V ~ 5.5V
Current - Timekeeping (Max)	0.6µA ~ 0.7µA @ 3V ~ 5V	100µA @ 3.3V	200µA @ 3.3V	125µA ~ 200µA @ 3.63V ~ 5.5V	200µA @ 5.5V	130µA ~ 200µA @ 3.63V ~ 5.5V	14µA ~ 15µA @ 3V ~ 5V	10µA ~ 20µA @ 2.7V ~ 5.5V	0.65µA @ 1.8V	4µA ~ 6µA @ 3V ~ 5V	4µA ~ 6µA @ 3V ~ 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	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	16-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	8-TSSOP (0.173", 4.40mm Width)	8-SOIC (0.154", 3.90mm Width)	8-WDFN Exposed Pad	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Features	Alarm, Leap Year, Square Wave Output	Leap Year, Square Wave Output, Trickle-Charger	Leap Year, NVSRAM, Square Wave Output	Leap Year, NVSRAM, Square Wave Output	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Alarm, Leap Year, Square Wave Output	Alarm, Daylight Savings, Leap Year, SRAM	Alarm, Leap Year	Alarm, Leap Year	Alarm, Leap Year, SRAM	Alarm, Leap Year, SRAM
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Obsolete	Active

Engineering Selection Recommendations

Direct Replacement (8-SOIC Package Category):

DS1338Z-33+ and DS1338Z-3+ are the most suitable direct replacements for the PT7C43390AWEX. Both maintain identical 8-SOIC packaging and support 12/24-hour time format with YY-MM-DD-dd date format. The DS1338Z-33+ operates within 3V to 5.5V supply range with current consumption of 125µA to 200µA at 3.63V to 5.5V. The DS1338Z-3+ extends the lower supply voltage limit to 2.7V. Both devices include NVSRAM memory and are manufactured by Analog Devices Inc./Maxim Integrated with active product status and ROHS3 compliance.

ISL12057IBZ provides the lowest timekeeping current consumption at 0.65µA at 1.8V, making it suitable for ultra-low-power applications. However, its supply voltage range is limited to 1.8V to 3.6V, which may not accommodate all system requirements. This part maintains 8-SOIC packaging and active product status.

BQ32000DR operates within 3V to 3.6V supply range with 100µA timekeeping current at 3.3V. This part includes trickle-charger functionality and maintains 8-SOIC packaging. Note that BQ32000DR supports only 24-hour time format, which may require firmware adjustments if 12-hour format is required.

ISL12026AIVZ offers low timekeeping current consumption of 10µA to 20µA across its 2.7V to 5.5V supply range. This part is housed in 8-TSSOP package and requires PCB layout modification.

Alternative Package Options:

DS1339U-33+ provides equivalent functionality in 8-TSSOP/8-MSOP package with alarm, leap year, square wave output, and trickle-charger features. Supply voltage range is 2.97V to 5.5V with 200µA timekeeping current at 5.5V.

DS3231M+ is housed in 16-SOIC package and offers extended supply voltage range of 2.3V to 5.5V with battery backup support from 2.3V to 5.5V. This part requires significant PCB layout changes due to larger package footprint.

ISL12022MAIBZ-T operates in 20-SOIC package with 128B SRAM memory, daylight savings support, and low timekeeping current of 14µA to 15µA at 3V to 5V. This part requires substantial PCB redesign.

Obsolete Parts:

ISL1208IRT8Z-TK carries obsolete product status and should not be selected for new designs despite its low timekeeping current characteristics of 4µA to 6µA at 3V to 5V.

Compliance and Certification:

All recommended substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the PT7C43390AWEX compliance profile. All parts carry EAR99 ECCN classification and HTSUS code 8542.39.0001.

Frequently Asked Questions (FAQ)

Q: Can DS1338Z-33+ directly replace PT7C43390AWEX without PCB modifications?

A: Yes. Both parts use identical 8-SOIC (0.154", 3.90mm Width) packaging. Pinout compatibility must be verified against device datasheets, but the package form factor allows direct PCB replacement without layout changes.

Q: What is the primary difference between DS1338Z-3+ and DS1338Z-33+?

A: The DS1338Z-3+ supports supply voltage from 2.7V to 5.5V, while DS1338Z-33+ operates from 3V to 5.5V. The DS1338Z-3+ provides broader voltage compatibility for systems requiring lower supply voltages.

Q: Why does BQ32000DR support only 24-hour time format?

A: BQ32000DR is designed with 24-hour time format as its standard configuration. Systems requiring 12-hour format operation must select alternative parts such as DS1338Z-33+, DS1338Z-3+, or ISL12057IBZ.

Q: Which substitute part offers the lowest power consumption?

A: ISL12057IBZ provides the lowest timekeeping current at 0.65µA at 1.8V. However, its supply voltage range is limited to 1.8V to 3.6V. For systems requiring broader voltage support, ISL12022MAIBZ-T offers 14µA to 15µA at 3V to 5V across a 2.7V to 5.5V supply range.

Q: Can parts in different packages (8-TSSOP, 16-SOIC, 20-SOIC) be used as substitutes?

A: Functionally, yes. However, these parts require PCB layout modifications due to different package geometries and pin counts. Direct PCB replacement is not possible without redesign.

Q: Is ISL1208IRT8Z-TK suitable for new designs?

A: No. ISL1208IRT8Z-TK carries obsolete product status. New designs should select from active product status parts such as DS1338Z-33+, ISL12057IBZ, or ISL12026AIVZ.

Q: What memory features distinguish substitute parts?

A: DS1338Z-3+ and DS1338Z-33+ include 56B NVSRAM. ISL12022MAIBZ-T provides 128B SRAM with daylight savings support. ISL1208IRT8Z-TK and ISL1208IU8Z-T7A include 2B SRAM. PT7C43390AWEX and several other substitutes do not include dedicated memory beyond timekeeping registers.

Q: Which substitute parts include trickle-charger functionality?

A: BQ32000DR, DS1339U-33+, and ISL12022MAIBZ-T include trickle-charger features for battery backup charging. PT7C43390AWEX does not include this feature.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status, matching the PT7C43390AWEX compliance requirement.

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