PCA9543APW Equivalent & Substitute Parts

Part Overview

The PCA9543APW is a translating switch interface IC manufactured by Texas Instruments, housed in a 14-TSSOP package. This component is classified as obsolete, though 3260 units remain in stock as new original inventory. The PCA9543APW functions as an I2C interface device with a supply voltage range of 2.3V to 5.5V. Due to its obsolete status, identifying equivalent and substitute parts is essential for ongoing system design, maintenance, and production continuity.

Substiute Parts

PCA9543APW

Texas InstrumentsIn Stock: 3365PCA9543APW Datasheet

Current PartRFQ

CA91L862A-50IEV

Renesas Electronics CorporationIn Stock: 2188CA91L862A-50IEV Datasheet

MFR RecommendedRFQ

PCA9543APW,118

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

MFR RecommendedRFQ

Z8523310VSG

ZilogIn Stock: 1043Z8523310VSG Datasheet

MFR RecommendedRFQ

Z8523320ASG

ZilogIn Stock: 760Z8523320ASG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA9543APW are identified based on the following critical parameters that determine functional and physical compatibility:

Primary Substitution Criteria:

• Interface type (I2C compatibility)
• Package form factor (14-TSSOP preferred for direct PCB compatibility)
• Supply voltage range (minimum 2.3V to 5.5V overlap required)
• Surface mount mounting type
• RoHS3 compliance status
• Moisture sensitivity level

Substitution Logic: The PCA9543APW,118 (NXP USA Inc.) represents the closest direct substitute, maintaining identical package geometry (14-TSSOP), I2C interface, and surface mount characteristics. This part is active in production status with compatible voltage specifications (2.3V ~ 3.6V, 4.5V ~ 5.5V).

The Z8523310VSG and Z8523320ASG (Zilog) are alternative interface ICs with different package configurations (44-PLCC and 44-LQFP respectively) and narrower voltage ranges (4.5V ~ 5.5V only). These represent functional alternatives where package footprint changes are acceptable.

The CA91L862A-50IEV (Renesas Electronics Corporation) operates at 3.3V supply voltage with a significantly different package (256-PBGA), representing a substitute only for applications where package migration is feasible and voltage requirements align.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: PCA9543APW,118 (NXP USA Inc.)

The PCA9543APW,118 is the recommended primary substitute. It maintains identical package geometry (14-TSSOP), identical interface type (I2C), and identical base product number (PCA9543). This part is in active production status, ensuring long-term availability. Both parts are ROHS3 compliant with unlimited moisture sensitivity levels. The voltage specification of 2.3V ~ 3.6V and 4.5V ~ 5.5V covers the original part's 2.3V ~ 5.5V range. Direct PCB footprint compatibility eliminates redesign requirements.

Secondary Substitutes: Z8523310VSG and Z8523320ASG (Zilog)

These Zilog interface ICs are active production alternatives suitable for applications where package footprint modification is acceptable. Both are ROHS3 compliant. The Z8523310VSG uses a 44-PLCC package, while the Z8523320ASG uses a 44-LQFP package. Both operate at 4.5V ~ 5.5V supply voltage, restricting their use to applications not requiring the lower 2.3V ~ 3.6V range of the original part. These parts carry MSL-3 ratings (168 hours), requiring controlled storage conditions compared to the original part's unlimited MSL.

Tertiary Substitute: CA91L862A-50IEV (Renesas Electronics Corporation)

The CA91L862A-50IEV represents a functional alternative only for applications where significant package migration is feasible. This part operates at 3.3V supply voltage exclusively, incompatible with applications requiring 5.5V operation. The 256-PBGA package requires substantial PCB redesign. This part is active in production and ROHS3 compliant but carries MSL-3 rating.

Frequently Asked Questions (FAQ)

Q: Can PCA9543APW,118 be used as a direct replacement for PCA9543APW?

A: Yes. Both parts share identical package geometry (14-TSSOP), interface type (I2C), and base product number (PCA9543). The voltage specifications are compatible across the operating range. No PCB modifications are required.

Q: What is the primary reason to substitute the PCA9543APW?

A: The PCA9543APW is classified as obsolete. The PCA9543APW,118 (NXP) is the active production equivalent, ensuring continued availability and supply chain stability.

Q: Can Zilog parts (Z8523310VSG, Z8523320ASG) replace the PCA9543APW without PCB changes?

A: No. Both Zilog parts use different package configurations (44-PLCC and 44-LQFP respectively) that are incompatible with the original 14-TSSOP footprint. PCB redesign is required.

Q: What is the voltage limitation of the Zilog substitutes?

A: Both Z8523310VSG and Z8523320ASG operate at 4.5V ~ 5.5V supply voltage only. They cannot operate in the 2.3V ~ 3.6V range supported by the original PCA9543APW. Applications requiring low-voltage operation must use the PCA9543APW,118 or remain with original stock.

Q: Is the CA91L862A-50IEV a practical substitute?

A: The CA91L862A-50IEV is a functional alternative only for applications where package migration from 14-TSSOP to 256-PBGA is feasible and 3.3V supply voltage is acceptable. Significant PCB redesign is required.

Q: What is the difference in moisture sensitivity between these parts?

A: The original PCA9543APW and PCA9543APW,118 both carry MSL-1 (Unlimited) ratings, requiring no special moisture control during storage. The Zilog parts (Z8523310VSG, Z8523320ASG) and Renesas part (CA91L862A-50IEV) carry MSL-3 ratings, requiring controlled storage at 168-hour maximum exposure limits before reflow soldering.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (PCA9543APW,118, Z8523310VSG, Z8523320ASG, and CA91L862A-50IEV) are ROHS3 compliant, matching the original part's compliance status.

Q: Which substitute offers the best long-term availability?

A: The PCA9543APW,118 (NXP USA Inc.) is the optimal choice for long-term availability. It is in active production status with identical functionality and package compatibility, eliminating redesign risk and ensuring supply chain continuity.