PCA9545APW Equivalent & Substitute Parts

Part Overview

The PCA9545APW 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 supply voltage range of 2.3V to 5.5V and is classified as obsolete. Due to its obsolete status, identifying functionally equivalent substitute parts is essential for ongoing system maintenance, redesigns, and procurement continuity.

Substiute Parts

PCA9545APW

Texas InstrumentsIn Stock: 89700PCA9545APW Datasheet

Current PartRFQ

MAX14502AETL+T

Analog Devices Inc./Maxim IntegratedIn Stock: 23600MAX14502AETL+T Datasheet

MFR RecommendedRFQ

NCT5946W

Nuvoton Technology CorporationIn Stock: 1191NCT5946W 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

Z8523316VSG

ZilogIn Stock: 2282Z8523316VSG Datasheet

MFR RecommendedRFQ

Z8523320ASG

ZilogIn Stock: 760Z8523320ASG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA9545APW are identified based on the following critical parameters:

• Interface Protocol: I2C and SMBus compatibility
• Voltage Supply Range: Operating voltage window of 2.3V to 5.5V
• Package Type: Surface mount configuration
• RoHS Compliance: ROHS3 Compliant status
• Moisture Sensitivity: MSL rating compatibility

The substitute parts listed below meet these criteria to varying degrees. Parts are grouped by their functional alignment with the original PCA9545APW specification.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility)

PCA9545APW,118 is the primary recommended substitute. Manufactured by NXP USA Inc., this part maintains identical electrical specifications (2.3V ~ 5.5V supply, I2C/SMBus interface) and package configuration (20-TSSOP) as the original PCA9545APW. The critical distinction is its Active product status, ensuring ongoing availability and supply chain continuity. Both parts carry ROHS3 compliance and MSL rating of 1.

PCA9545APW,112 provides an alternative from NXP USA Inc. with matching electrical and package specifications. However, its Obsolete product status limits its long-term procurement viability.

Secondary Substitutes (Conditional Compatibility)

NCT5946W from Nuvoton Technology Corporation supports I2C interface and maintains ROHS3 compliance with Active product status. However, incomplete specification data regarding voltage supply range and package details requires verification before selection.

Limited Compatibility Substitutes

MAX14502AETL+T from Analog Devices Inc./Maxim Integrated supports I2C and 2-Wire Serial protocols with Active status and ROHS3 compliance. The voltage supply range (1.8V ~ 3.3V) is narrower than the original part and incompatible with applications requiring the full 2.3V ~ 5.5V range. The 40-TQFN package differs from the original 20-TSSOP, requiring PCB layout modifications.

Z8523320ASG and Z8523316VSG from Zilog are interface ICs with Active status and ROHS3 compliance. Voltage supply specifications (4.5V ~ 5.5V) do not cover the lower end of the original part's range. Interface protocol details are not specified. Package configurations (44-LQFP and 44-PLCC respectively) differ significantly from the original 20-TSSOP, necessitating substantial design changes.

Frequently Asked Questions (FAQ)

Q: Can PCA9545APW,118 be used as a direct replacement for PCA9545APW?

A: Yes. Both parts share identical electrical specifications (2.3V ~ 5.5V supply voltage, I2C/SMBus interface), package configuration (20-TSSOP), RoHS compliance, and moisture sensitivity rating. The primary difference is product status: PCA9545APW,118 is Active, ensuring supply availability.

Q: Why is MAX14502AETL+T listed as a substitute if its voltage range differs?

A: MAX14502AETL+T is included because it appears in the manufacturer's substitute list for PCA9545APW. However, its 1.8V ~ 3.3V supply range does not cover the full 2.3V ~ 5.5V specification of the original part. Selection requires confirmation that your application operates within the narrower voltage window.

Q: What are the package implications of selecting Z8523320ASG or Z8523316VSG?

A: Both Zilog parts use larger packages (44-LQFP and 44-PLCC respectively) compared to the original 20-TSSOP. This requires PCB redesign, including modified footprints, routing, and potentially different board space allocation. These parts should be considered only when package change is acceptable.

Q: Is NCT5946W a viable substitute despite incomplete specifications?

A: NCT5946W supports I2C interface and maintains Active product status with ROHS3 compliance. However, missing voltage supply range and package specifications prevent definitive compatibility assessment. Verification against your application requirements and detailed datasheet review is necessary before selection.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings in substitute selection?

A: MSL ratings indicate moisture sensitivity during storage and handling. The original PCA9545APW and most recommended substitutes carry MSL 1 (Unlimited), meaning no moisture precautions are required. Z8523320ASG and Z8523316VSG carry MSL 3 (168 Hours), requiring controlled storage conditions and limiting shelf life. Selection depends on your manufacturing and storage capabilities.