PCA9674ATS,112 Equivalent & Substitute Parts

Part Overview

The PCA9674ATS,112 is an 8-bit I/O Expander with I2C interface operating at 1 MHz, manufactured by NXP USA Inc. in a 20-SSOP surface mount package. This component is classified as Obsolete, making identification of compatible substitutes essential for ongoing system support and new design implementations. The part provides push-pull output configuration with interrupt capability and operates across a wide supply voltage range of 2.3V to 5.5V.

Substiute Parts

PCA9674ATS,112

NXP USA Inc.In Stock: 833PCA9674ATS,112 Datasheet

Current PartRFQ

PCA9674APW,118

NXP USA Inc.In Stock: 54576PCA9674APW,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9674ATS,112 is determined by the following critical parameters that must remain consistent:

• I/O Count: 8 bits (functional requirement for pin-compatible replacement)
• Interface Protocol: I2C at 1 MHz clock frequency (communication standard)
• Interrupt Output: Yes (functional feature requirement)
• Output Configuration: Push-Pull (electrical output characteristic)
• Current Specifications: 100µA source / 25mA sink (electrical performance)
• Supply Voltage Range: 2.3V ~ 5.5V (power compatibility)
• Operating Temperature: -40°C ~ 85°C (environmental specification)
• Compliance: ROHS3 Compliant, MSL Level 1 (regulatory and handling requirements)

The PCA9674APW,118 qualifies as a manufacturer-recommended substitute based on matching all critical electrical and functional parameters. The primary difference is the package type: the substitute uses 16-TSSOP instead of 20-LSSOP, which requires PCB layout modification but maintains full electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The PCA9674APW,118 is the manufacturer-recommended substitute for the obsolete PCA9674ATS,112. Selection of this substitute is supported by:

• Product Status Alignment: The substitute is Active, ensuring long-term availability and supply chain continuity compared to the Obsolete status of the original part.
• Electrical Equivalence: All functional and electrical parameters are identical, including I/O count, interface protocol, clock frequency, output characteristics, and supply voltage specifications.
• Compliance Consistency: Both parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring regulatory and handling requirements are preserved.
• Package Consideration: The transition from 20-LSSOP to 16-TSSOP requires PCB layout redesign. The 16-pin configuration reduces the physical footprint while maintaining the same 0.173" width specification. This change necessitates schematic and layout verification to ensure proper signal routing and pin assignment.

Frequently Asked Questions (FAQ)

Q: Can the PCA9674APW,118 be used as a direct pin-for-pin replacement?

A: No. The PCA9674APW,118 uses a 16-TSSOP package compared to the 20-LSSOP package of the original part. While electrically equivalent, the pin count and physical layout differ, requiring PCB redesign and schematic updates.

Q: Are the I2C communication protocols identical between these parts?

A: Yes. Both parts operate as 8-bit I/O Expanders with I2C interface at 1 MHz clock frequency. The communication protocol, addressing scheme, and register structure are identical.

Q: What is the primary advantage of using the substitute part?

A: The PCA9674APW,118 is an Active product with high inventory availability (54,466 pcs), whereas the original PCA9674ATS,112 is Obsolete. This ensures reliable long-term supply and reduces procurement risk.

Q: Are there any electrical performance differences?

A: No. Both parts provide identical output current specifications (100µA source / 25mA sink), supply voltage range (2.3V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and interrupt output functionality.

Q: What packaging format is available for the substitute?

A: The PCA9674APW,118 is supplied in Tape & Reel (TR) format, suitable for automated assembly processes.