PCA9557BSHP Equivalent & Substitute Parts

Part Overview

The PCA9557BSHP is an 8-bit I/O Expander designed for I2C and SMBus communication at 400 kHz, packaged in a 16-HVQFN (4x4) surface mount configuration. This component is classified as Obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across I/O count, interface protocol, electrical characteristics, and physical packaging.

Substiute Parts

PCA9557BSHP

NXP USA Inc.In Stock: 895PCA9557BSHP Datasheet

Current PartRFQ

PCA9557BS,118

NXP USA Inc.In Stock: 1996PCA9557BS,118 Datasheet

MFR RecommendedRFQ

PCA9557RGVR

Texas InstrumentsIn Stock: 5616PCA9557RGVR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9557BSHP is determined by strict equivalence across the following parameters:

• I/O Configuration: 8-bit I/O count (non-negotiable)
• Communication Interface: I2C and SMBus protocol support at 400 kHz
• Electrical Specifications: Supply voltage range 2.3V ~ 5.5V, operating temperature -40°C ~ 85°C
• Output Architecture: Open Drain output type with specified current ratings
• Physical Form Factor: 16-VQFN Exposed Pad package for surface mount assembly
• Functional Features: Power-On Reset capability

The identified substitute parts maintain these core parameters while offering active product status and improved availability. Packaging format differences (Tape & Reel vs. Cut Tape) do not affect functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

PCA9557BS,118 is the primary substitute for the PCA9557BSHP. Both parts are manufactured by NXP USA Inc., ensuring design continuity and supply chain consistency. The PCA9557BS,118 maintains identical core electrical and functional specifications while offering Active product status. This part carries ROHS3 compliance and unlimited moisture sensitivity rating, providing superior long-term reliability for storage and handling. Tape & Reel packaging is standard for production volume applications.

PCA9557RGVR serves as an alternative substitute manufactured by Texas Instruments. This part maintains functional equivalence across all critical parameters and offers the highest current availability. The PCA9557RGVR is ROHS3 compliant and suitable for applications where cross-manufacturer sourcing is acceptable. The MSL-2 rating requires controlled storage conditions (1-year shelf life from manufacturing date).

Both substitute parts support identical I/O configurations, communication protocols, and electrical operating ranges. Selection between them should be based on supply chain requirements, manufacturer preference, and packaging format availability for production processes.

Frequently Asked Questions (FAQ)

Q: Can PCA9557BS,118 or PCA9557RGVR be used as direct replacements for PCA9557BSHP in existing designs?

A: Yes. Both substitute parts maintain identical I/O count (8-bit), interface protocols (I2C/SMBus at 400 kHz), supply voltage range (2.3V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and package form factor (16-VQFN Exposed Pad). No circuit modifications are required.

Q: What is the difference in output current capability between the main part and substitutes?

A: The PCA9557BSHP specifies 10mA/20mA source/sink current. Both PCA9557BS,118 and PCA9557RGVR provide 10mA/25mA, offering increased sink current capacity. Applications designed for the original 20mA specification will operate within the substitute specifications.

Q: Are there packaging format considerations when switching between these parts?

A: The PCA9557BSHP uses standard packaging, while PCA9557BS,118 is supplied in Tape & Reel format and PCA9557RGVR in Cut Tape & Digi-Reel format. These differences affect handling and assembly processes but do not impact electrical or functional compatibility. Confirm packaging compatibility with your production assembly requirements.

Q: What is the significance of the Moisture Sensitivity Level (MSL) difference?

A: PCA9557BSHP and PCA9557BS,118 both carry MSL-1 (Unlimited), allowing indefinite storage without moisture control. PCA9557RGVR carries MSL-2 (1 Year), requiring controlled storage conditions and bake-out procedures if shelf life is exceeded. Select based on your inventory management and storage capabilities.

Q: Why is PCA9557BSHP classified as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The identified substitute parts (PCA9557BS,118 and PCA9557RGVR) maintain full functional equivalence while offering Active product status and ongoing manufacturer support.

Q: Can both substitute parts be used interchangeably in the same design?

A: Yes. Both parts meet identical functional and electrical requirements. However, cross-manufacturer substitution (NXP to Texas Instruments) may require supply chain approval depending on your organization's component qualification procedures.