PCA9544APW Equivalent & Substitute Parts

Part Overview

The PCA9544APW is a translating switch interface IC manufactured by Texas Instruments, designed for I2C and SMBus applications. This component operates across a supply voltage range of 2.3V to 5.5V and is housed in a 20-TSSOP surface mount package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

PCA9544APW

Texas InstrumentsIn Stock: 65882PCA9544APW Datasheet

Current PartRFQ

PCA9544APW,118

NXP USA Inc.In Stock: 3014PCA9544APW,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9544APW is determined by the following critical parameters:

Interface Protocol Compatibility: Both the main part and substitute must support I2C and SMBus protocols to maintain system-level functionality.

Package Specification: The 20-TSSOP package with 0.173" width and 4.40mm dimensions is a mandatory requirement for PCB layout compatibility and assembly process alignment.

Voltage Supply Range: The substitute must operate within the specified supply voltage window. The original part operates at 2.3V ~ 5.5V.

Mounting Technology: Surface mount technology is required for compatibility with modern assembly processes.

Base Product Number: The PCA9544 base designation indicates the functional family to which equivalent parts belong.

Regulatory Compliance: RoHS3 compliance and REACH unaffected status ensure regulatory alignment across manufacturing jurisdictions.

Parameter Comparison

Engineering Selection Recommendations

The PCA9544APW,118 manufactured by NXP USA Inc. is the designated manufacturer-recommended substitute for the obsolete Texas Instruments PCA9544APW. Both parts share identical package specifications, interface protocols, and regulatory compliance certifications.

The substitute part maintains active product status, ensuring continued availability and manufacturing support. The voltage supply range of the NXP variant specifies two discrete operating windows (2.3V ~ 3.6V and 4.5V ~ 5.5V) compared to the continuous range of the original part. This specification difference reflects typical dual-supply-rail operation in modern systems and does not restrict substitution in applications operating within these defined ranges.

Both parts carry ROHS3 compliance and REACH unaffected status, confirming alignment with current environmental and regulatory requirements. The identical moisture sensitivity level (MSL 1, Unlimited) indicates equivalent handling and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can the PCA9544APW,118 be used as a direct replacement for the PCA9544APW?

A: Yes, the PCA9544APW,118 is the manufacturer-recommended substitute. Both parts share identical package specifications (20-TSSOP), interface protocols (I2C, SMBus), and regulatory compliance status. The voltage supply specification difference reflects operational design rather than a functional limitation.

Q: What is the significance of the voltage supply range difference between the two parts?

A: The original part specifies a continuous range of 2.3V ~ 5.5V, while the substitute specifies 2.3V ~ 3.6V and 4.5V ~ 5.5V. This indicates the substitute is optimized for dual-supply-rail applications. Applications operating within either specified window remain fully compatible.

Q: Are there any PCB layout or assembly process changes required when substituting the PCA9544APW,118?

A: No. Both parts use identical 20-TSSOP packaging with matching physical dimensions (0.173" width, 4.40mm). PCB footprints, assembly processes, and thermal management requirements remain unchanged.

Q: What is the packaging format difference, and does it affect component selection?

A: The substitute is supplied in Tape & Reel (TR) format, which is standard for high-volume manufacturing and automated assembly. This format difference does not affect electrical or mechanical compatibility; it reflects supply chain and manufacturing process optimization.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both the PCA9544APW and PCA9544APW,118 are ROHS3 compliant and REACH unaffected, confirming compliance with current environmental and regulatory standards across manufacturing jurisdictions.