TCA9554ADWT Equivalent & Substitute Parts

Part Overview

The TCA9554ADWT is an 8-bit I/O expander IC manufactured by Texas Instruments, designed for I2C and SMBus communication at 400 kHz. This device provides 8 programmable I/O pins with interrupt output capability and push-pull output configuration. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required for design flexibility, inventory management, or supply chain continuity.

Substiute Parts

TCA9554ADWT

Texas InstrumentsIn Stock: 931TCA9554ADWT Datasheet

Current PartRFQ

PCA8574D,518

NXP USA Inc.In Stock: 1634PCA8574D,518 Datasheet

MFR RecommendedRFQ

PCA9554AD,118

NXP USA Inc.In Stock: 3992PCA9554AD,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TCA9554ADWT are qualified based on the following critical parameters:

• Number of I/O: 8 pins (mandatory match)
• Interface Protocol: I2C and/or SMBus support at 400 kHz
• Package Type: 16-SOIC form factor with 0.295" width and 7.50mm height
• Output Configuration: Push-pull output type
• Interrupt Capability: Interrupt output present
• Operating Temperature Range: -40°C ~ 85°C minimum
• Supply Voltage Range: Minimum 1.65V to 5.5V support
• Product Status: Active production
• Compliance: RoHS3 compliant

Two substitute parts meet these criteria: PCA9554AD,118 (NXP USA Inc.) and PCA8574D,518 (NXP USA Inc.). Both devices maintain functional equivalence through matching I/O count, interface protocols, package specifications, and operating parameters.

Parameter Comparison

Engineering Selection Recommendations

PCA9554AD,118 (NXP USA Inc.) is the primary substitute for the TCA9554ADWT. This part maintains full functional equivalence with identical I/O count, interface protocols (I2C and SMBus), clock frequency, operating temperature range, and package specifications. The supply voltage range is 2.3V ~ 5.5V, which is compatible with applications operating above 2.3V. Moisture sensitivity level matches at MSL 1 (Unlimited). Both devices are in active production with ROHS3 compliance and REACH unaffected status.

PCA8574D,518 (NXP USA Inc.) is a secondary substitute with the following considerations: The device supports I2C protocol at 400 kHz but does not include SMBus protocol support. Supply voltage range is 2.3V ~ 5.5V. Moisture sensitivity level is MSL 2 (1 Year), which is less favorable than the primary part. All other electrical and mechanical parameters match the main part. This substitute is suitable for applications requiring only I2C communication without SMBus dependency.

Both substitute parts are manufactured by NXP USA Inc., are in active production status, and maintain RoHS3 compliance. Selection between these options depends on protocol requirements (SMBus support) and moisture sensitivity constraints for the target application.

Frequently Asked Questions (FAQ)

Q: Can PCA9554AD,118 be used as a direct replacement for TCA9554ADWT?

A: Yes. Both devices share identical I/O count (8), interface protocols (I2C and SMBus), clock frequency (400 kHz), operating temperature range (-40°C ~ 85°C), and 16-SOIC package specifications. The supply voltage range of PCA9554AD,118 (2.3V ~ 5.5V) is compatible with applications operating above 2.3V. Moisture sensitivity level is equivalent at MSL 1 (Unlimited).

Q: What is the key difference between PCA9554AD,118 and PCA8574D,518?

A: PCA9554AD,118 supports both I2C and SMBus protocols, while PCA8574D,518 supports I2C only. Additionally, PCA8574D,518 has a moisture sensitivity level of MSL 2 (1 Year) compared to MSL 1 (Unlimited) for PCA9554AD,118. All other electrical and mechanical parameters are equivalent.

Q: Are the package dimensions identical across all three parts?

A: Yes. All three parts use the 16-SOIC package with 0.295" width and 7.50mm height, ensuring identical PCB footprint and mounting compatibility.

Q: What supply voltage range must be considered when selecting a substitute?

A: The TCA9554ADWT operates from 1.65V ~ 5.5V. Both NXP substitutes operate from 2.3V ~ 5.5V. Applications requiring operation below 2.3V must use the original TCA9554ADWT part.

Q: Do all three parts support interrupt output functionality?

A: Yes. All three parts include interrupt output capability with push-pull output configuration and POR (Power-On Reset) feature.

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

A: All three parts are RoHS3 compliant, REACH unaffected, and in active production status. The primary difference is moisture sensitivity level: TCA9554ADWT and PCA9554AD,118 are MSL 1 (Unlimited), while PCA8574D,518 is MSL 2 (1 Year).