PCA9545APWT Equivalent & Substitute Parts

Part Overview

The PCA9545APWT is a translating switch interface IC manufactured by Texas Instruments, designed for I2C and SMBus applications. This 20-TSSOP surface mount device operates across a 2.3V to 5.5V supply voltage range and functions as a 4-channel I2C switcher. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Substiute Parts

PCA9545APWT

Texas InstrumentsIn Stock: 968PCA9545APWT Datasheet

Current PartRFQ

ADN8102ACPZ

Analog Devices Inc.In Stock: 4759ADN8102ACPZ Datasheet

MFR RecommendedRFQ

PCA9545APW,112

NXP USA Inc.In Stock: 1902PCA9545APW,112 Datasheet

MFR RecommendedRFQ

PCA9545APW,118

NXP USA Inc.In Stock: 3120PCA9545APW,118 Datasheet

MFR RecommendedRFQ

PI4MSD5V9544ALEX

Diodes IncorporatedIn Stock: 2279PI4MSD5V9544ALEX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCA9545APWT is determined by the following critical parameters:

• Interface Compatibility: I2C and SMBus protocol support
• Package Type: 20-TSSOP form factor for PCB layout compatibility
• Voltage Supply Range: 2.3V to 5.5V operational window
• Mounting Type: Surface mount technology
• Functional Classification: Translating switch or multiplexer functionality
• Compliance Standards: ROHS3 compliance and REACH unaffected status

Substitute parts are grouped into two categories based on these parameters:

Category 1 - Direct Functional Equivalents (Same Package, Same Interface)

• PCA9545APW,112 (NXP USA Inc.)
• PCA9545APW,118 (NXP USA Inc.)

These parts maintain identical package specifications, voltage ranges, and I2C/SMBus interface protocols, differing only in packaging format and product status.

Category 2 - Functional Alternatives (Different Package, Compatible Interface)

• PI4MSD5V9544ALEX (Diodes Incorporated)
• ADN8102ACPZ (Analog Devices Inc.)

These parts provide equivalent switching or multiplexing functionality but operate within different package types and voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred for Existing Designs)

PCA9545APW,118 is the recommended primary substitute. This part maintains identical electrical specifications, package geometry, and interface protocols as the PCA9545APWT. The part carries active product status, ensuring long-term availability and supply chain stability. ROHS3 compliance and unlimited MSL rating provide equivalent environmental handling characteristics.

PCA9545APW,112 serves as a secondary option with identical technical specifications but obsolete product status, limiting its suitability for new designs despite current inventory availability.

For New Designs Requiring Extended Availability

ADN8102ACPZ offers active product status with ROHS3 compliance and REACH unaffected certification. However, this part operates within a reduced voltage range (1.8V to 3.3V) and employs a significantly different package format (64-VFQFN). Design integration requires PCB layout modification and voltage supply verification.

For Multiplexer-Based Applications

PI4MSD5V9544ALEX maintains the 20-TSSOP package footprint and supports extended voltage operation (1.65V to 5.5V). This part is classified as Last Time Buy, indicating limited future availability and unsuitability for long-term production designs.

Frequently Asked Questions (FAQ)

Q: Can PCA9545APW,118 be used as a direct drop-in replacement for PCA9545APWT?

A: Yes. Both parts share identical voltage supply ranges (2.3V to 5.5V), I2C/SMBus interface protocols, 20-TSSOP package specifications, and surface mount mounting type. Pinout and functional operation are equivalent. The primary difference is product status: PCA9545APW,118 is active while PCA9545APWT is obsolete.

Q: What are the packaging differences between substitute options?

A: PCA9545APW,112 and PCA9545APW,118 use identical 20-TSSOP packaging. PI4MSD5V9544ALEX also employs 20-TSSOP but functions as a multiplexer rather than a translating switch. ADN8102ACPZ uses 64-VFQFN packaging, requiring complete PCB redesign and is not suitable for direct replacement.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and REACH unaffected status, matching the environmental compliance profile of the PCA9545APWT.

Q: What is the significance of MSL ratings in these parts?

A: PCA9545APWT, PCA9545APW,112, PCA9545APW,118, and PI4MSD5V9544ALEX all carry MSL 1 (Unlimited) ratings, indicating no moisture sensitivity restrictions during storage and handling. ADN8102ACPZ carries MSL 3 (168 Hours), requiring controlled humidity storage and limiting shelf life to 168 hours after moisture exposure.

Q: Which substitute is recommended for new production designs?

A: PCA9545APW,118 is the recommended choice for new designs. It maintains complete electrical and mechanical compatibility with the original part while offering active product status, ensuring supply chain continuity and long-term availability.