PCA9557D,112 Equivalent & Substitute Parts

Part Overview

The PCA9557D,112 is an 8-bit I/O expander IC designed for I2C and SMBus communication at 400 kHz, manufactured by NXP USA Inc. in a 16-SOIC surface mount package. This component provides open drain and push-pull output configurations with power-on reset (POR) functionality, operating across a supply voltage range of 2.3V to 5.5V and temperature range of -40°C to 85°C.

The PCA9557D,112 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Substiute Parts

PCA9557D,112

NXP USA Inc.In Stock: 697PCA9557D,112 Datasheet

Current PartRFQ

PCA9557D

Texas InstrumentsIn Stock: 4106PCA9557D Datasheet

DirectRFQ

PCA9557DR

Texas InstrumentsIn Stock: 154594PCA9557DR Datasheet

MFR RecommendedRFQ

PCA9557DT

Texas InstrumentsIn Stock: 1586PCA9557DT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA9557D,112 are qualified based on the following electrical and mechanical parameters:

• Number of I/O: 8 channels (fixed requirement)
• Interface Protocol: I2C and SMBus at 400 kHz (fixed requirement)
• Output Configuration: Open Drain and Push-Pull capability (fixed requirement)
• Supply Voltage Range: 2.3V ~ 5.5V (fixed requirement)
• Operating Temperature Range: -40°C ~ 85°C (fixed requirement)
• Package Type: 16-SOIC surface mount form factor (fixed requirement)
• Power-On Reset Feature: POR functionality (fixed requirement)
• Compliance Standards: ROHS3 Compliant, REACH Unaffected, MSL Level 1

All substitute parts listed maintain identical electrical specifications and mechanical compatibility with the original PCA9557D,112. Variations in output current source/sink ratings (20mA vs. 25mA) and packaging options (tube, cut tape, tape & reel) do not affect functional substitution.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: PCA9557DR (Texas Instruments)

The PCA9557DR is the preferred substitute for the PCA9557D,112. This part maintains active product status with the manufacturer, ensuring long-term availability and supply chain stability. The PCA9557DR is available in Cut Tape and Digi-Reel packaging formats with inventory of 154,514 units, providing reliable sourcing for production applications. All electrical and mechanical specifications are identical to the original part, with output current capability increased to 25mA, which provides enhanced performance margin without affecting compatibility.

Secondary Recommendations: PCA9557D and PCA9557DT (Texas Instruments)

The PCA9557D and PCA9557DT are functionally equivalent alternatives. Both parts are classified as obsolete but maintain identical electrical specifications. The PCA9557D is available in tube packaging with 4,020 units in stock. The PCA9557DT is supplied in tape & reel format with 1,512 units available. These options are suitable for applications where packaging format or inventory availability aligns with procurement requirements.

Compliance Verification

All substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL Level 1 moisture sensitivity rating, ensuring regulatory and environmental compliance equivalent to the original PCA9557D,112.

Frequently Asked Questions (FAQ)

Q: Can PCA9557DR be used as a direct replacement for PCA9557D,112?

A: Yes. The PCA9557DR is electrically and mechanically compatible with the PCA9557D,112. Both parts feature 8 I/O channels, I2C/SMBus 400 kHz interface, identical supply voltage range (2.3V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and 16-SOIC surface mount package. The increased output current capability (25mA vs. 20mA) provides additional performance margin without affecting circuit compatibility.

Q: What is the difference between PCA9557D, PCA9557DR, and PCA9557DT?

A: These parts are electrically identical but differ in packaging and product status. PCA9557D is supplied in tube format and is obsolete. PCA9557DR is supplied in cut tape and digi-reel format and maintains active product status. PCA9557DT is supplied in tape & reel format and is obsolete. All three parts are functionally equivalent for circuit design purposes.

Q: Why is PCA9557DR recommended over other substitutes?

A: PCA9557DR is recommended because it maintains active product status with the manufacturer, ensuring continued availability and supply chain reliability. With 154,514 units in stock, it provides the most stable long-term sourcing option compared to obsolete alternatives.

Q: Are there any compatibility concerns when substituting the PCA9557D,112?

A: No compatibility concerns exist. All substitute parts maintain identical pin configuration, electrical specifications, and mechanical form factor. The 16-SOIC package dimensions (0.154" width, 3.90mm) are consistent across all parts, ensuring direct PCB compatibility without layout modifications.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All substitute parts are ROHS3 compliant, REACH unaffected, and classified as MSL Level 1 (unlimited moisture sensitivity), matching the compliance profile of the original PCA9557D,112.