PCA9544ADWR Equivalent & Substitute Parts

Part Overview

The PCA9544ADWR is a translating switch interface IC manufactured by Texas Instruments, designed for I2C and SMBus applications. This 20-SOIC surface mount component operates across a supply voltage range of 2.3V to 5.5V and is currently classified as Last Time Buy, indicating end-of-life status. Due to this product status, identifying functionally compatible substitute components is essential for ongoing design support and procurement continuity.

Substiute Parts

PCA9544ADWR

Texas InstrumentsIn Stock: 10574PCA9544ADWR Datasheet

Current PartRFQ

TCA9544APWR

Texas InstrumentsIn Stock: 700108TCA9544APWR Datasheet

MFR RecommendedRFQ

MAX3798ETJ+T

Analog Devices Inc./Maxim IntegratedIn Stock: 2128MAX3798ETJ+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCA9544ADWR is determined by the following critical parameters:

• Interface Protocol Compatibility: I2C and SMBus support
• Supply Voltage Range: Minimum 2.3V operation capability
• Package Type: Surface mount configuration
• Functional Classification: Translating switch or multiplexer functionality
• Regulatory Compliance: ROHS3 and REACH compliance status

The identified substitute parts are grouped based on their ability to maintain these core electrical and mechanical specifications within the constraints of their respective package formats.

Parameter Comparison

Engineering Selection Recommendations

TCA9544APWR is the primary substitute from Texas Instruments. This component maintains the same base product architecture (TCA9544) with active product status, ensuring long-term availability. The supply voltage range of 1.65V to 5.5V encompasses the original 2.3V to 5.5V specification. The package transition from 20-SOIC to 20-TSSOP requires PCB layout modification but maintains pin-count compatibility. ROHS3 and REACH compliance status matches the original component.

MAX3798ETJ+T is listed as a secondary substitute but operates within a narrower voltage range (2.85V to 3.63V), which does not fully encompass the original 2.3V minimum specification. This component is classified as a limiting amplifier rather than a translating switch interface, indicating functional divergence from the original application. Selection of this substitute requires verification that the narrower voltage specification and different functional classification align with specific circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can TCA9544APWR directly replace PCA9544ADWR without PCB modifications?

A: The TCA9544APWR maintains the same pin count (20 pins) and surface mount configuration. However, the package geometry differs (20-TSSOP versus 20-SOIC), requiring PCB footprint redesign. Electrical compatibility is maintained within the specified voltage and interface parameters.

Q: What is the significance of the voltage supply range difference between PCA9544ADWR (2.3V ~ 5.5V) and TCA9544APWR (1.65V ~ 5.5V)?

A: The TCA9544APWR supports operation at lower voltages (1.65V) than the original component. For applications operating at or above 2.3V, this expanded range presents no compatibility issue. Applications requiring operation below 2.3V cannot use the original PCA9544ADWR specification and would benefit from the TCA9544APWR's extended lower voltage capability.

Q: Is MAX3798ETJ+T suitable as a substitute for the PCA9544ADWR?

A: The MAX3798ETJ+T operates within a restricted voltage range (2.85V to 3.63V) that does not fully cover the original 2.3V minimum specification. Additionally, this component functions as a limiting amplifier rather than a translating switch interface. Substitution requires confirmation that the application voltage range and functional requirements align with this component's specifications.

Q: What packaging considerations apply when transitioning from PCA9544ADWR to TCA9544APWR?

A: The transition from 20-SOIC (0.295" width) to 20-TSSOP (0.173" width) represents a package size reduction. PCB layout modifications are required, including footprint redesign and potential trace routing adjustments. Pin pitch and lead configuration differ between packages, necessitating design review before implementation.

Q: Are all substitute parts ROHS3 and REACH compliant?

A: Yes. Both TCA9544APWR and MAX3798ETJ+T maintain ROHS3 compliance and REACH unaffected status, matching the original PCA9544ADWR specifications.