PCA9546APW Equivalent & Substitute Parts

Part Overview

The PCA9546APW 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 16-TSSOP package. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

PCA9546APW

Texas InstrumentsIn Stock: 80146PCA9546APW Datasheet

Current PartRFQ

ADN8102ACPZ

Analog Devices Inc.In Stock: 4759ADN8102ACPZ Datasheet

MFR RecommendedRFQ

MAX3798ETJ+

Analog Devices Inc./Maxim IntegratedIn Stock: 1114MAX3798ETJ+ Datasheet

MFR RecommendedRFQ

PCA9546APW,118

NXP SemiconductorsIn Stock: 24142PCA9546APW,118 Datasheet

MFR RecommendedRFQ

Z8523320ASG

ZilogIn Stock: 760Z8523320ASG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCA9546APW is determined by the following critical parameters:

Primary Substitution Criteria:

• Functional category: Interface, specialized translating switch
• Interface protocol: I2C and/or SMBus compatibility
• Supply voltage range: Minimum 2.3V to 5.5V operational capability
• Package type: Surface mount configuration
• Product status: Active or available inventory

Identified Substitute Groups:

Group 1: Direct Functional Equivalent (Recommended) PCA9546APW,118 from NXP Semiconductors matches the original specification exactly, including identical interface protocols (I2C, SMBus), voltage range (2.3V ~ 5.5V), package type (16-TSSOP), and functional application (translating switch). This part is currently active with substantial inventory availability.

Group 2: Alternative Interface Controllers ADN8102ACPZ (Analog Devices Inc.) and Z8523320ASG (Zilog) are classified as interface specialized components. Both support I2C protocol and surface mount configuration. However, these parts operate within different voltage ranges and package configurations, requiring design-level evaluation for compatibility.

Group 3: Specialized Amplifier Interface MAX3798ETJ+ (Analog Devices Inc./Maxim Integrated) is a limiting amplifier with differential output characteristics. While categorized as an interface component with I2C support, its primary function differs from the translating switch application of the original part.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: PCA9546APW,118

The NXP Semiconductors variant PCA9546APW,118 is the direct functional equivalent for the obsolete Texas Instruments PCA9546APW. This part maintains identical electrical specifications, interface protocols, voltage range, and package configuration. Both components are ROHS3 compliant with unlimited moisture sensitivity rating. The NXP variant is currently in active production status with 24,100 units available in inventory, providing supply continuity for existing designs and new implementations.

Secondary Alternatives: Conditional Evaluation Required

ADN8102ACPZ and Z8523320ASG are interface-category components with active product status and ROHS3 compliance. However, these parts operate within restricted voltage ranges (1.8V ~ 3.3V and 4.5V ~ 5.5V respectively) compared to the original 2.3V ~ 5.5V specification. Package configurations differ significantly (64-LFCSP and 44-LQFP versus 16-TSSOP), requiring PCB layout redesign. These alternatives are suitable only when system voltage constraints align with their operational ranges and board space permits larger package footprints.

Not Recommended: MAX3798ETJ+

The MAX3798ETJ+ is a limiting amplifier with differential output characteristics, functionally distinct from the translating switch application. While I2C compatible, its primary design purpose and electrical characteristics do not align with translating switch requirements.

Frequently Asked Questions (FAQ)

Q: Can PCA9546APW,118 be used as a direct replacement for the obsolete PCA9546APW?

A: Yes. The PCA9546APW,118 manufactured by NXP Semiconductors is electrically and functionally identical to the original Texas Instruments part. Both operate at 2.3V ~ 5.5V supply voltage, support I2C and SMBus protocols, use 16-TSSOP packaging, and are ROHS3 compliant. Pin configuration and functional behavior are equivalent, allowing direct substitution without design modification.

Q: What are the key differences between the primary substitute and alternative options?

A: The primary substitute (PCA9546APW,118) maintains all original specifications. Alternative options (ADN8102ACPZ, Z8523320ASG) differ in voltage operating ranges, package sizes, and primary applications. ADN8102ACPZ operates at 1.8V ~ 3.3V in a 64-pin package designed for Ethernet control. Z8523320ASG operates at 4.5V ~ 5.5V in a 44-pin package. These alternatives require design-level compatibility assessment.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The original PCA9546APW and all identified substitute parts (PCA9546APW,118, ADN8102ACPZ, Z8523320ASG, MAX3798ETJ+) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of the 16-TSSOP package for substitution?

A: The 16-TSSOP package is a thin shrink small-outline package with 0.173" width and 4.40mm height. Only PCA9546APW,118 maintains this package configuration. Alternative substitutes use larger packages (64-LFCSP, 44-LQFP, 32-TQFN), requiring PCB redesign, different footprints, and potentially modified board layouts. Package compatibility is critical for direct board-level substitution.

Q: How does moisture sensitivity level affect component selection?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to moisture before soldering. The original PCA9546APW and PCA9546APW,118 have MSL 1 (unlimited exposure tolerance), providing maximum handling flexibility. ADN8102ACPZ and Z8523320ASG have MSL 3 (168-hour limit), requiring stricter moisture control during storage and assembly. MAX3798ETJ+ has MSL 1 (unlimited). For high-volume manufacturing or extended storage, MSL 1 components are preferred.

Q: Can ADN8102ACPZ or Z8523320ASG be used in systems designed for the original PCA9546APW?

A: Not without design modification. ADN8102ACPZ operates at 1.8V ~ 3.3V (incompatible with systems requiring 2.3V ~ 5.5V operation) and uses a 64-pin package requiring complete PCB redesign. Z8523320ASG operates at 4.5V ~ 5.5V (narrower range than original) and uses a 44-pin package. Both require functional verification and board layout changes. These are alternative solutions only when system constraints permit such modifications.