TCA9554DBR Equivalent & Substitute Parts

Part Overview

The TCA9554DBR is an 8-bit I/O expander interface circuit manufactured by Texas Instruments, designed for I2C communication at 400 kHz. This device is classified as an active product with full RoHS3 compliance and unlimited moisture sensitivity rating. The TCA9554DBR operates across a supply voltage range of 1.65V to 5.5V and supports operating temperatures from -40°C to 85°C. Substitute parts are necessary when specific packaging requirements, extended temperature ranges, or alternative sourcing strategies are required for production environments.

Substiute Parts

TCA9554DBR

Texas InstrumentsIn Stock: 64463TCA9554DBR Datasheet

Current PartRFQ

MAX7324AEG+

Analog Devices Inc./Maxim IntegratedIn Stock: 1149MAX7324AEG+ Datasheet

MFR RecommendedRFQ

MAX7324ATG+

Analog Devices Inc./Maxim IntegratedIn Stock: 1239MAX7324ATG+ Datasheet

MFR RecommendedRFQ

MAX7324ATG+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1015MAX7324ATG+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TCA9554DBR are qualified based on the following electrical and mechanical parameters:

Core Electrical Compatibility:

• Number of I/O: 8 channels
• Interface Protocol: I2C at 400 kHz
• Output Configuration: Push-Pull
• Interrupt Output: Present
• Power-On Reset (POR): Included

Allowable Parameter Variations:

• Supply Voltage Range: Substitutes must support the TCA9554DBR operating range (1.65V ~ 5.5V minimum)
• Operating Temperature: Substitutes may extend the upper temperature limit beyond 85°C
• Output Current Capability: Substitutes may provide specified source/sink current (20mA in substitute parts)
• Package Type: Different surface mount packages are acceptable if PCB layout permits

Compliance Requirements:

• RoHS3 Compliance: Required
• REACH Status: Unaffected
• MSL Rating: 1 (Unlimited)

The three substitute parts (MAX7324AEG+, MAX7324ATG+, MAX7324ATG+T) share the same base product number (MAX7324) and maintain electrical equivalence while offering alternative packaging and sourcing options.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain active product status and full RoHS3 compliance, ensuring regulatory alignment with the TCA9554DBR. The MAX7324 series substitutes provide extended operating temperature capability (-40°C to 125°C) compared to the TCA9554DBR (-40°C to 85°C), making them suitable for applications requiring higher thermal performance.

Package Selection Considerations:

MAX7324AEG+ features a 24-SSOP package in tube packaging, suitable for lower-volume applications or manual assembly processes.

MAX7324ATG+ and MAX7324ATG+T both utilize the 24-TQFN (4x4) package with exposed pad, offering improved thermal dissipation and smaller footprint. The primary distinction is packaging format: MAX7324ATG+ is supplied in tube format, while MAX7324ATG+T is supplied in tape and reel format for automated assembly.

Voltage Supply Compatibility:

The substitute parts specify a minimum supply voltage of 1.71V compared to the TCA9554DBR minimum of 1.65V. This represents a negligible difference in practical applications and does not restrict substitution in standard operating conditions.

All parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, confirming regulatory equivalence.

Frequently Asked Questions (FAQ)

Q: Can MAX7324 series parts directly replace TCA9554DBR in existing designs?

A: Electrical substitution is valid based on matching I/O count (8), interface protocol (I2C 400 kHz), output configuration (Push-Pull), and interrupt capability. However, package differences require PCB layout verification. The TCA9554DBR uses 16-SSOP packaging, while MAX7324 substitutes use either 24-SSOP or 24-TQFN packages. Pin-to-pin compatibility must be confirmed through datasheet cross-reference before implementation.

Q: What is the significance of the extended operating temperature range in MAX7324 parts?

A: MAX7324 substitutes support -40°C to 125°C operation compared to TCA9554DBR's -40°C to 85°C range. This extended upper temperature limit accommodates applications in high-temperature environments or systems with elevated internal operating conditions. If your application operates within the TCA9554DBR temperature range, this difference is not a limiting factor.

Q: How do packaging formats affect component selection?

A: TCA9554DBR is supplied in cut tape and digi-reel format. MAX7324AEG+ uses tube packaging, while MAX7324ATG+ uses tube and MAX7324ATG+T uses tape and reel. Tape and reel format (MAX7324ATG+T) is optimized for high-volume automated assembly. Tube format is suitable for lower volumes or manual pick-and-place operations. Select based on your production volume and assembly process requirements.

Q: Are there supply voltage compatibility concerns?

A: MAX7324 parts specify 1.71V minimum supply voltage versus TCA9554DBR's 1.65V minimum. Both support the full 5.5V maximum. This 0.06V difference is negligible in standard power supply designs and does not create practical compatibility issues.

Q: Do all substitute parts maintain the same compliance certifications?

A: Yes. All substitute parts are RoHS3 compliant, REACH unaffected, and carry MSL rating 1 (unlimited). ECCN and HTSUS classifications are identical across all parts, confirming regulatory and trade compliance equivalence.

Q: Which substitute part should be selected for new designs?

A: Selection depends on packaging and sourcing requirements. For smallest footprint and thermal performance, use MAX7324ATG+ or MAX7324ATG+T in 24-TQFN package. For compatibility with existing 24-pin SSOP layouts, use MAX7324AEG+. For high-volume production, MAX7324ATG+T (tape and reel) offers cost efficiency in automated assembly.