TCA9554DWR Equivalent & Substitute Parts

Part Overview

The TCA9554DWR is an 8-bit I/O expander interface circuit manufactured by Texas Instruments, designed for I2C communication at 400 kHz. This device provides general-purpose input/output expansion capabilities with interrupt output functionality and push-pull output configuration. The part is currently in active production status with 684 units in stock. Equivalent and substitute parts are identified when they maintain functional compatibility across core electrical parameters including I/O count, interface protocol, clock frequency, and supply voltage range, while accommodating variations in package form factor and thermal operating range.

Substiute Parts

TCA9554DWR

Texas InstrumentsIn Stock: 770TCA9554DWR 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

PCA9554D,118

NXP USA Inc.In Stock: 100226PCA9554D,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TCA9554DWR are qualified based on the following core electrical and functional parameters:

Essential Compatibility Criteria:

• Number of I/O: 8 (all substitutes maintain this specification)
• Interface Protocol: I2C (all substitutes support I2C)
• Clock Frequency: 400 kHz (all substitutes operate at this frequency)
• Output Type: Push-Pull (all substitutes use push-pull configuration)
• Interrupt Output: Yes (all substitutes include interrupt capability)
• Features: POR (all substitutes include Power-On Reset)

Allowable Variations:

• Package form factor (16-SOIC, 24-QSOP, 24-TQFN permitted)
• Supply voltage range (1.65V–5.5V minimum; 1.71V–5.5V acceptable)
• Operating temperature range (-40°C to 85°C minimum; -40°C to 125°C acceptable)
• Output current specifications (when specified)
• Packaging type (Tube, Cut Tape, Tape & Reel)

The three qualified substitutes (MAX7324AEG+, MAX7324ATG+, PCA9554D,118) meet all essential criteria while offering alternative package options and extended thermal ratings.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts maintain active production status and ROHS3 compliance, meeting regulatory requirements equivalent to the TCA9554DWR.

MAX7324AEG+ and MAX7324ATG+ offer extended operating temperature range (-40°C to 125°C) compared to the TCA9554DWR (-40°C to 85°C), providing thermal margin for high-temperature applications. These parts differ in package form factor: MAX7324AEG+ uses 24-SSOP while MAX7324ATG+ uses 24-TQFN with exposed pad. Both require PCB layout modifications due to package size increase from 16-SOIC.

PCA9554D,118 maintains the same 16-SOIC package footprint as the TCA9554DWR, enabling direct board-level substitution without layout redesign. This part adds SMBus protocol support in addition to I2C. The minimum supply voltage is 2.3V compared to 1.65V for the TCA9554DWR, which may limit use in ultra-low-voltage applications.

Selection should prioritize package compatibility requirements and thermal operating range specifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can MAX7324AEG+ and MAX7324ATG+ be used interchangeably with TCA9554DWR on the same PCB?

A: No. Both MAX7324 variants use 24-pin packages (SSOP and TQFN respectively) compared to the 16-pin SOIC package of TCA9554DWR. PCB layout and routing modifications are required. The parts are functionally equivalent but not pin-compatible.

Q: What is the primary advantage of PCA9554D,118 as a substitute?

A: PCA9554D,118 maintains the 16-SOIC package footprint identical to TCA9554DWR, allowing direct substitution without PCB redesign. It also supports SMBus protocol in addition to I2C, providing protocol flexibility.

Q: Are there supply voltage compatibility concerns when substituting parts?

A: The TCA9554DWR operates from 1.65V minimum. MAX7324AEG+ and MAX7324ATG+ require 1.71V minimum, and PCA9554D,118 requires 2.3V minimum. Applications operating below 2.3V must use either TCA9554DWR or MAX7324 variants. Applications operating above 2.3V can use any substitute.

Q: Do all substitute parts include Power-On Reset functionality?

A: Yes. All three substitute parts (MAX7324AEG+, MAX7324ATG+, PCA9554D,118) include POR functionality matching the TCA9554DWR specification.

Q: What is the difference between MAX7324AEG+ and MAX7324ATG+?

A: Both parts are functionally identical with identical electrical specifications. The difference is package form factor: MAX7324AEG+ uses 24-SSOP while MAX7324ATG+ uses 24-TQFN with exposed pad. Selection depends on PCB layout requirements and thermal management strategy.

Q: Can PCA9554D,118 be used in applications requiring SMBus protocol?

A: Yes. PCA9554D,118 supports both I2C and SMBus protocols. Applications using only I2C protocol will operate identically to TCA9554DWR.