PCA9554TS,118 Equivalent & Substitute Parts

Part Overview

The PCA9554TS,118 is an 8-bit I/O Expander with I2C and SMBus interface operating at 400 kHz, manufactured by NXP USA Inc. in a 20-SSOP package. This component is classified as Obsolete, which necessitates identification of active equivalent parts for new designs and ongoing production requirements. The part features push-pull output configuration with interrupt output capability and operates across a supply voltage range of 2.3V to 5.5V.

Substiute Parts

PCA9554TS,118

NXP USA Inc.In Stock: 722PCA9554TS,118 Datasheet

Current PartRFQ

PCA9554BPWJ

NXP USA Inc.In Stock: 2493PCA9554BPWJ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9554TS,118 is determined by the following critical parameters:

• I/O Count: 8 I/O lines (functional requirement)
• Interface Protocol: I2C and SMBus compatibility at 400 kHz clock frequency
• Output Configuration: Push-Pull output type with specified current ratings (10mA source, 25mA sink)
• Interrupt Output: Presence of interrupt output capability
• Supply Voltage Range: Operating voltage compatibility
• Operating Temperature Range: -40°C to 85°C
• Compliance Standards: RoHS3 and REACH compliance
• Mounting Type: Surface mount configuration

The PCA9554BPWJ qualifies as a direct substitute based on matching all functional parameters, though it operates in an Active product status and features an improved supply voltage range (1.65V ~ 5.5V). The package format differs (16-TSSOP versus 20-LSSOP), requiring PCB layout modification.

Parameter Comparison

Engineering Selection Recommendations

The PCA9554BPWJ is the manufacturer-recommended substitute for the obsolete PCA9554TS,118. Both components maintain identical functional specifications for I/O expansion, interface protocol, and electrical performance. The substitute part carries Active product status, ensuring long-term availability and supply chain continuity.

Both parts satisfy ROHS3 and REACH compliance requirements, with MSL rating of 1 (Unlimited), indicating no moisture sensitivity constraints during storage and handling.

The primary design consideration is the package transition from 20-LSSOP to 16-TSSOP, which requires PCB layout modification. The substitute part offers an extended lower supply voltage limit (1.65V versus 2.3V), providing additional operational flexibility in low-voltage applications.

Frequently Asked Questions (FAQ)

Q: Can the PCA9554BPWJ directly replace the PCA9554TS,118 without design changes?

A: Functional substitution is possible; however, the package format differs (16-TSSOP versus 20-LSSOP). PCB layout and footprint modifications are required. Pin configuration must be verified against the respective datasheets to ensure correct signal routing.

Q: What is the significance of the package change from 20-LSSOP to 16-TSSOP?

A: The 16-TSSOP package is more compact than the 20-LSSOP, reducing board space requirements. Both packages maintain the same body width (0.173", 4.40mm). The pin count reduction from 20 to 16 reflects optimized packaging; functional I/O capability remains at 8 lines.

Q: Are there supply voltage compatibility concerns when substituting?

A: The PCA9554BPWJ operates at 1.65V ~ 5.5V, which encompasses the original part's 2.3V ~ 5.5V range. Applications operating above 2.3V experience no voltage-related compatibility issues. Applications requiring operation below 2.3V benefit from the extended lower voltage specification of the substitute.

Q: Do both parts maintain identical I2C/SMBus protocol compliance?

A: Yes. Both components operate at 400 kHz clock frequency with identical I2C and SMBus interface specifications. Protocol-level compatibility is maintained.

Q: What compliance certifications apply to both parts?

A: Both the PCA9554TS,118 and PCA9554BPWJ are ROHS3 Compliant and REACH Unaffected. Moisture Sensitivity Level is 1 (Unlimited) for both parts, indicating no special moisture control requirements during manufacturing or storage.