TCA9554DBQR Equivalent & Substitute Parts

Part Overview

The TCA9554DBQR is an 8-bit I/O expander interface circuit manufactured by Texas Instruments, designed for I2C communication at 400 kHz. This device operates across a wide voltage range of 1.65V to 5.5V and functions within an operating temperature range of -40°C to 85°C. The part is currently in active production status and is ROHS3 compliant. Substitute parts are identified when equivalent functional specifications and electrical parameters align with the original device, enabling direct replacement in applications where package and thermal requirements permit.

Substiute Parts

TCA9554DBQR

Texas InstrumentsIn Stock: 3527TCA9554DBQR Datasheet

Current PartRFQ

MAX7324AEG+

Analog Devices Inc./Maxim IntegratedIn Stock: 1149MAX7324AEG+ 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 TCA9554DBQR are qualified based on the following core electrical and functional parameters:

• Number of I/O: 8 (must match)
• Interface: I2C (must match)
• Clock Frequency: 400 kHz (must match)
• Output Type: Push-Pull (must match)
• Interrupt Output: Yes (must match)
• Features: POR (Power-On Reset, must match)
• Voltage Supply Range: Compatible overlap required
• Operating Temperature: Compatible range required
• RoHS Status: ROHS3 Compliant (must match)
• Product Status: Active (must match)

The identified substitute parts maintain functional equivalence across these parameters. Package type differences are noted as they may require PCB layout modifications but do not affect electrical compatibility when interface requirements are met.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active production status and ROHS3 compliance, meeting regulatory requirements for current applications. The TCA9554DBQR operates within a lower temperature range (-40°C to 85°C) compared to the MAX7324 variants (-40°C to 125°C), which provide extended thermal performance. The substitute parts offer identical I/O count, interface protocol, and clock frequency specifications.

Package differences exist between the original 16-SSOP format and the substitute options (24-QSOP and 24-TQFN). These package variations require PCB layout reconfiguration but do not alter electrical compatibility. The MAX7324 series specifies 20mA output source/sink current, whereas the TCA9554DBQR does not provide this specification in the available data.

Selection between substitute parts should account for PCB footprint availability, thermal management requirements, and packaging format compatibility with existing assembly processes.

Frequently Asked Questions (FAQ)

Q: Can MAX7324AEG+ and MAX7324ATG+T be used interchangeably with TCA9554DBQR?

A: Both MAX7324 variants meet the core electrical and functional requirements: 8 I/O, I2C 400 kHz interface, push-pull output, interrupt capability, and POR feature. Substitution is electrically valid. However, package differences (16-SSOP versus 24-QSOP or 24-TQFN) require PCB layout modifications.

Q: What are the key differences between MAX7324AEG+ and MAX7324ATG+T?

A: Both parts share identical electrical specifications and voltage/temperature ranges. The primary difference is packaging format: MAX7324AEG+ uses 24-QSOP in Tube packaging, while MAX7324ATG+T uses 24-TQFN (4x4) in Tape & Reel format. Moisture sensitivity levels differ (MSL 1 for both, but with different duration ratings).

Q: Does the extended operating temperature range of MAX7324 parts affect compatibility?

A: The MAX7324 series operates to 125°C versus 85°C for the TCA9554DBQR. This extended range does not create compatibility issues; it provides additional thermal margin. Applications operating within the TCA9554DBQR temperature range remain fully compatible.

Q: Are there voltage supply compatibility concerns?

A: The TCA9554DBQR operates from 1.65V to 5.5V, while MAX7324 parts operate from 1.71V to 5.5V. The 0.06V difference at the lower threshold is negligible for standard applications. Both ranges cover standard 3.3V and 5V logic levels.

Q: What packaging considerations apply when substituting these parts?

A: The TCA9554DBQR uses 16-SSOP packaging, while substitutes use larger packages (24-QSOP or 24-TQFN). PCB footprint, trace routing, and component placement must be redesigned. Verify that the selected package fits within available board space and thermal requirements.