PCA9543AD Equivalent & Substitute Parts

Part Overview

The PCA9543AD is a 2-Channel I2C Multiplexer Interface manufactured by Texas Instruments, packaged in 14-SOIC surface mount configuration. This component enables multiplexing of I2C and SMBus communication channels, allowing a single I2C master to communicate with multiple I2C slave devices on separate bus segments. The part is currently in Last Time Buy status, making identification of suitable alternatives essential for ongoing design support and production continuity.

Substiute Parts

PCA9543AD

Texas InstrumentsIn Stock: 3337PCA9543AD Datasheet

Current PartRFQ

TCA9543ADR

Texas InstrumentsIn Stock: 3033TCA9543ADR Datasheet

MFR RecommendedRFQ

ADN8102ACPZ

Analog Devices Inc.In Stock: 4759ADN8102ACPZ Datasheet

MFR RecommendedRFQ

PCA9543AD,118

NXP USA Inc.In Stock: 3517PCA9543AD,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9543AD is determined by the following critical parameters:

Primary Substitution Criteria:

• Interface protocol compatibility (I2C/SMBus support)
• Channel configuration (2-channel multiplexing capability)
• Voltage supply range overlap (minimum 2.3V ~ 5.5V support)
• Package compatibility (14-SOIC form factor)
• Surface mount mounting type
• RoHS3 compliance and MSL rating

Substitute Parts Identified:

1. TCA9543ADR (Texas Instruments) – Direct functional equivalent with identical channel configuration, package, and voltage range. Differs in product status (Active vs. Last Time Buy) and packaging format (Cut Tape vs. Tube).

2. PCA9543AD,118 (NXP USA Inc.) – Functionally equivalent 2-channel I2C multiplexer with matching voltage supply range and package specifications. Maintains identical interface protocol and electrical characteristics. Packaging differs (Tape & Reel vs. Tube).

3. ADN8102ACPZ (Analog Devices Inc.) – Specialized Ethernet Controller Interface with I2C support. This part operates within a narrower voltage range (1.8V ~ 3.3V), uses a different package format (64-LFCSP-VQ), and serves a different primary application domain. Substitution is limited to I2C interface applications only and requires careful voltage compatibility verification.

Parameter Comparison

Engineering Selection Recommendations

Recommended Primary Substitutes:

TCA9543ADR and PCA9543AD,118 are the preferred alternatives for direct replacement of the PCA9543AD. Both parts maintain identical functional specifications, voltage supply ranges, and package form factors. Both are in Active product status, ensuring long-term availability and supply chain stability. Selection between these two should be based on packaging requirements (Cut Tape vs. Tape & Reel) and inventory availability.

Secondary Substitute:

ADN8102ACPZ is suitable only for applications where the narrower voltage supply range (1.8V ~ 3.3V) is compatible with system design requirements. The different package format (64-LFCSP-VQ) requires PCB layout redesign. This part is recommended only when primary substitutes are unavailable and system voltage constraints permit its use.

Compliance Considerations:

All identified substitutes maintain ROHS3 compliance and EAR99 ECCN classification, consistent with the original PCA9543AD specifications. Moisture sensitivity levels for TCA9543ADR and PCA9543AD,118 match the original part (MSL 1), while ADN8102ACPZ requires MSL 3 handling procedures.

Frequently Asked Questions (FAQ)

Q: Can TCA9543ADR be used as a direct drop-in replacement for PCA9543AD?

A: TCA9543ADR is functionally equivalent and maintains the same 14-SOIC package, voltage supply range (1.65V ~ 5.5V exceeds the original 2.3V ~ 5.5V), and I2C/SMBus interface specifications. Packaging format differs (Cut Tape vs. Tube), but electrical compatibility is complete.

Q: What is the difference between PCA9543AD and PCA9543AD,118?

A: Both parts are 2-channel I2C multiplexers with identical electrical specifications and 14-SOIC packaging. The primary difference is manufacturer (Texas Instruments vs. NXP USA Inc.) and packaging format (Tube vs. Tape & Reel). Functional performance is equivalent.

Q: Is ADN8102ACPZ suitable for all PCA9543AD applications?

A: ADN8102ACPZ supports I2C interface but operates within a narrower voltage range (1.8V ~ 3.3V) and uses a significantly different package (64-LFCSP-VQ vs. 14-SOIC). Substitution is limited to applications where system voltage remains within 1.8V ~ 3.3V and PCB layout can accommodate the larger package footprint.

Q: What are the key parameters that determine substitution compatibility?

A: Critical parameters include I2C/SMBus interface support, 2-channel multiplexing capability, voltage supply range compatibility, 14-SOIC package format, surface mount mounting type, and RoHS3 compliance. Deviations in any of these parameters require detailed application-level verification.

Q: Why is the PCA9543AD in Last Time Buy status?

A: Last Time Buy status indicates the manufacturer is discontinuing this product line. TCA9543ADR and PCA9543AD,118 are Active status alternatives that provide equivalent functionality with assured long-term availability.

Q: Are there any handling differences between these substitute parts?

A: TCA9543ADR and PCA9543AD,118 share MSL 1 (Unlimited) moisture sensitivity with the original part. ADN8102ACPZ requires MSL 3 handling procedures (168-hour limit), necessitating different storage and assembly protocols.