PCA9544ADGVR Equivalent & Substitute Parts

Part Overview

The PCA9544ADGVR 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-TVSOP surface mount package. The device is currently in Last Time Buy status, indicating limited availability and the necessity to identify functionally compatible alternatives for ongoing design requirements and production planning.

Substiute Parts

PCA9544ADGVR

Texas InstrumentsIn Stock: 3435PCA9544ADGVR Datasheet

Current PartRFQ

TCA9544APWR

Texas InstrumentsIn Stock: 700108TCA9544APWR Datasheet

MFR RecommendedRFQ

AD9985ABSTZ-110

Analog Devices Inc.In Stock: 20598AD9985ABSTZ-110 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCA9544ADGVR is determined by the following critical parameters:

Primary Substitution Criteria:

• Interface protocol compatibility (I2C/SMBus support)
• Surface mount packaging with equivalent or compatible footprint dimensions
• Supply voltage range overlap or compatibility with system requirements
• RoHS3 compliance and regulatory alignment
• Moisture sensitivity level suitable for manufacturing and storage conditions

Identified Substitutes:

TCA9544APWR (Texas Instruments) qualifies as a direct substitute based on shared manufacturer lineage, identical base product number (TCA9544), compatible 20-pin surface mount package (20-TSSOP with 0.173", 4.40mm width), overlapping supply voltage range (1.65V ~ 5.5V encompasses the original 2.3V ~ 5.5V), and equivalent RoHS3 compliance. This part is in Active product status with substantial inventory availability.

AD9985ABSTZ-110 (Analog Devices Inc.) is listed as a substitute but operates in a different functional category (Video Interface) with a different package type (80-LQFP), different supply voltage range (2.2V ~ 3.45V), and higher moisture sensitivity level (MSL 3). This part is in Last Time Buy status and represents a limited-scope alternative for specific video interface applications only.

Parameter Comparison

Engineering Selection Recommendations

TCA9544APWR is the primary recommended substitute for the PCA9544ADGVR. Both components share Texas Instruments manufacturing, identical base product architecture, compatible 20-pin surface mount packages with matching width specifications (4.40mm), and equivalent RoHS3 compliance. The TCA9544APWR offers an extended lower supply voltage limit (1.65V versus 2.3V), providing greater operational flexibility. Critically, the TCA9544APWR maintains Active product status with high inventory availability (700,024 pieces), ensuring long-term supply chain continuity compared to the Last Time Buy status of the original part.

AD9985ABSTZ-110 is not recommended as a general substitute due to fundamental differences in package type (80-LQFP versus 20-pin), restricted supply voltage range (2.2V ~ 3.45V), elevated moisture sensitivity level (MSL 3), and different functional application (video interface). This part should be considered only for specialized video interface applications where the original PCA9544ADGVR was not the intended component.

Frequently Asked Questions (FAQ)

Q: Can TCA9544APWR be used as a direct replacement for PCA9544ADGVR in existing designs?

A: TCA9544APWR is compatible for most applications. Both parts share the same base product number (TCA9544/PCA9544), operate on overlapping supply voltage ranges, and use compatible 20-pin surface mount packages. PCB layout modifications are minimal due to matching package dimensions (0.173", 4.40mm width). Verify that your system supply voltage falls within the TCA9544APWR range (1.65V ~ 5.5V).

Q: What is the difference between 20-TFSOP and 20-TSSOP packages?

A: Both are 20-pin thin shrink small outline packages with identical width (0.173", 4.40mm) and pin pitch. TFSOP and TSSOP designations reflect minor manufacturing variations but are mechanically and electrically compatible for PCB assembly purposes.

Q: Why is AD9985ABSTZ-110 listed as a substitute if it has a different package?

A: AD9985ABSTZ-110 is listed in the manufacturer's substitute field but is not a practical replacement for general I2C/SMBus translating switch applications. It serves a different functional purpose (video interface) and requires different PCB layout and supply voltage design. This part should only be considered if your application specifically requires video interface functionality.

Q: What does Last Time Buy status mean for the PCA9544ADGVR?

A: Last Time Buy indicates that Texas Instruments will discontinue this part after current inventory is depleted. No new production runs are planned. Designs should transition to the TCA9544APWR (Active status) to ensure long-term component availability and supply chain stability.

Q: Are there any compliance or regulatory differences between these parts?

A: All three parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 export classification. The primary compliance difference is moisture sensitivity level: PCA9544ADGVR and TCA9544APWR both have MSL 1 (Unlimited), while AD9985ABSTZ-110 has MSL 3 (168 Hours), requiring more stringent storage and handling procedures.