PCA9543APWRG4 Equivalent & Substitute Parts

Part Overview

The PCA9543APWRG4 is a translating switch interface IC manufactured by Texas Instruments, designed for I2C bus applications. This device operates across a supply voltage range of 2.3V to 5.5V and is housed in a 14-TSSOP surface mount package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for ongoing system support and new designs.

Substiute Parts

PCA9543APWRG4

Texas InstrumentsIn Stock: 1039PCA9543APWRG4 Datasheet

Current PartRFQ

PCA9543APWR

Texas InstrumentsIn Stock: 17240PCA9543APWR Datasheet

MFR RecommendedRFQ

PCA9543APW,118

NXP USA Inc.In Stock: 2262PCA9543APW,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9543APWRG4 is determined by the following critical parameters:

• Base Product Number: All substitutes must share the PCA9543 base designation, ensuring functional equivalence in I2C translating switch operation
• Package / Case: Substitutes must use the 14-TSSOP package format (0.173", 4.40mm Width) to ensure PCB footprint compatibility
• Mounting Type: Surface mount requirement must be maintained
• Interface Protocol: I2C compatibility is mandatory
• Voltage Supply Range: Operating voltage must encompass or align with the 2.3V to 5.5V specification
• Compliance Standards: RoHS3 compliance and REACH unaffected status must be maintained

Two substitute parts meet these criteria and are identified as manufacturer-recommended alternatives.

Parameter Comparison

Engineering Selection Recommendations

PCA9543APWR (Texas Instruments) is the primary recommended substitute. This part maintains identical electrical specifications (2.3V ~ 5.5V supply voltage) and mechanical compatibility (14-TSSOP package). The device is currently in active production status with substantial inventory availability (17,200 pcs), ensuring supply chain continuity. It supports both I2C and SMBus protocols, providing expanded interface compatibility. All compliance certifications (ROHS3, REACH unaffected) are maintained.

PCA9543APW,118 (NXP USA Inc.) serves as a secondary alternative. This NXP-manufactured variant shares the same base product number, package format, and compliance standards. The supply voltage specification differs slightly, supporting 2.3V ~ 3.6V and 4.5V ~ 5.5V ranges with a gap in the 3.6V ~ 4.5V region. This part is actively produced with adequate inventory (2,200 pcs). Selection of this substitute requires verification that system operating voltage does not fall within the 3.6V ~ 4.5V gap.

Frequently Asked Questions (FAQ)

Q: Can PCA9543APWR be used as a direct replacement for PCA9543APWRG4?

A: Yes. Both parts share identical base product designation (PCA9543), package format (14-TSSOP), mounting type (surface mount), and supply voltage range (2.3V ~ 5.5V). PCB footprint and electrical interface compatibility are maintained. The PCA9543APWR is the manufacturer-recommended substitute with active production status.

Q: What is the difference between PCA9543APWR and PCA9543APW,118?

A: Both are functionally equivalent I2C interface ICs in 14-TSSOP packages. The primary difference is manufacturer: PCA9543APWR is from Texas Instruments, while PCA9543APW,118 is from NXP USA Inc. The NXP variant specifies supply voltage as 2.3V ~ 3.6V and 4.5V ~ 5.5V, creating a gap in the 3.6V ~ 4.5V range. The Texas Instruments part covers the continuous 2.3V ~ 5.5V range. Both maintain ROHS3 compliance and REACH unaffected status.

Q: Are there any package or footprint differences between these substitutes?

A: No. All three parts (PCA9543APWRG4, PCA9543APWR, and PCA9543APW,118) use the identical 14-TSSOP package format with 0.173" width and 4.40mm dimensions. Surface mount footprints are compatible across all variants.

Q: Why is the original PCA9543APWRG4 discontinued?

A: The PCA9543APWRG4 is discontinued at DiGi Electronics. The active substitute PCA9543APWR from Texas Instruments provides equivalent functionality and is currently in production with full inventory availability.

Q: Does the PCA9543APWR support SMBus in addition to I2C?

A: Yes. The PCA9543APWR supports both I2C and SMBus protocols, providing expanded interface compatibility compared to the original PCA9543APWRG4 specification.

Q: What is the moisture sensitivity level for these parts?

A: All three parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage or handling.