TCA8424RHAR Equivalent & Substitute Parts

Part Overview

The TCA8424RHAR is a specialized interface IC manufactured by Texas Instruments, designed for I2C communication applications. This device is packaged in a 40-VQFN (6x6) configuration with an exposed pad and operates across a supply voltage range of 1.65V to 3.6V. The part carries a "Not For New Designs" product status, indicating it has been superseded in Texas Instruments' product portfolio. Due to this discontinued status and limited suitability for new development, identifying compatible substitute components is essential for ongoing maintenance, legacy system support, and design flexibility.

Substiute Parts

TCA8424RHAR

Texas InstrumentsIn Stock: 2869TCA8424RHAR Datasheet

Current PartRFQ

TCA8418RTWR

Texas InstrumentsIn Stock: 44439TCA8418RTWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TCA8424RHAR is determined by the following critical parameters:

Primary Compatibility Criteria:

• Manufacturer: Texas Instruments (same manufacturer ensures design continuity and support)
• Interface Protocol: I2C (functional requirement for communication)
• Voltage Supply Range: 1.65V ~ 3.6V (electrical compatibility)
• RoHS Compliance: ROHS3 Compliant (regulatory requirement)
• Mounting Type: Surface Mount (PCB assembly compatibility)

Secondary Considerations:

• Package configuration and pin count may differ if the application permits redesign or layout adjustment
• Moisture Sensitivity Level may vary; lower MSL values indicate better storage and handling characteristics

The TCA8418RTWR qualifies as a substitute based on matching the core electrical parameters (I2C interface, identical supply voltage range, ROHS3 compliance, and surface mount technology). While the package differs (24-WQFN versus 40-VQFN), this substitution is valid for applications where pin count reduction or smaller form factor is acceptable.

Parameter Comparison

Engineering Selection Recommendations

TCA8424RHAR (Original Part): The TCA8424RHAR carries a "Not For New Designs" status, indicating Texas Instruments has transitioned this component out of active production. This part remains suitable for legacy system maintenance and repair applications where existing designs must be preserved. The part maintains full ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory standards.

TCA8418RTWR (Substitute Part): The TCA8418RTWR is classified as an Active product, making it the preferred choice for new development and ongoing production. This substitute shares identical electrical specifications (I2C interface, 1.65V–3.6V supply voltage) and regulatory compliance (ROHS3, REACH unaffected) with the original part. The TCA8418RTWR offers improved moisture handling characteristics (MSL 2 versus MSL 3), providing superior reliability during storage and assembly processes. The reduced pin count (24 versus 40) and smaller package footprint (4x4 versus 6x6) may require PCB layout modifications but enable more compact designs.

Frequently Asked Questions (FAQ)

Q: Can the TCA8418RTWR directly replace the TCA8424RHAR without PCB modifications?

A: Direct pin-for-pin replacement is not possible due to different package configurations (24-WQFN versus 40-VQFN). PCB layout redesign is required. However, both parts share the same I2C interface protocol and supply voltage range, making functional substitution feasible with appropriate schematic and layout updates.

Q: What are the key electrical compatibility factors between these parts?

A: Both parts operate on identical supply voltage (1.65V–3.6V), use the same I2C communication protocol, and maintain ROHS3 compliance. These parameters ensure electrical and regulatory compatibility at the system level.

Q: Why does the TCA8418RTWR have a lower Moisture Sensitivity Level (MSL 2 versus MSL 3)?

A: MSL 2 (1 Year) indicates the component can tolerate longer periods of ambient humidity exposure compared to MSL 3 (168 Hours). This represents an improvement in component robustness and reduces risk during manufacturing and storage phases.

Q: Is the TCA8418RTWR suitable for new product designs?

A: Yes. The TCA8418RTWR carries an Active product status, making it the appropriate choice for new development. The TCA8424RHAR's "Not For New Designs" designation indicates it should be avoided for new projects.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant and REACH unaffected. No compliance or certification differences exist between the two components.