PCA9555PW,112 Equivalent & Substitute Parts

Part Overview

The PCA9555PW,112 is a 16-bit I/O expander IC manufactured by NXP Semiconductors, designed for I2C and SMBus communication at 400 kHz. This interface component provides programmable input/output expansion for embedded systems and microcontroller applications. The part is currently in active production status with 4829 units available in stock. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and interface protocols to ensure seamless integration in system designs.

Substiute Parts

PCA9555PW,112

NXP SemiconductorsIn Stock: 4902PCA9555PW,112 Datasheet

Current PartRFQ

PCA9555PW,118

NXP USA Inc.In Stock: 52925PCA9555PW,118 Datasheet

MFR RecommendedRFQ

NLVPCA9535EDTR2G

onsemiIn Stock: 5716NLVPCA9535EDTR2G Datasheet

MFR RecommendedRFQ

TCA9555PWR

Texas InstrumentsIn Stock: 55618TCA9555PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA9555PW,112 are classified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Number of I/O: 16 bits (mandatory match)
• Package / Case: 24-TSSOP form factor (mandatory match for PCB compatibility)
• Interface Protocol: I2C or SMBus support (mandatory for communication compatibility)
• Mounting Type: Surface Mount (mandatory for assembly compatibility)

Secondary Compatibility Parameters:

• Clock Frequency: 400 kHz operation (preferred for SMBus compliance)
• Output Type: Push-Pull configuration (preferred for drive capability)
• Voltage Supply Range: Overlap with 2.3V ~ 5.5V (required for power supply compatibility)
• Operating Temperature: Coverage of -40°C ~ 85°C range (required for thermal compatibility)

Parts are grouped into two categories: direct equivalents (matching all primary and secondary parameters) and functional alternatives (matching primary parameters with acceptable deviations in secondary specifications).

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

PCA9555PW,118 and TCA9555PWR are functionally equivalent to the PCA9555PW,112 for most applications. Both parts maintain 16-bit I/O configuration, 400 kHz clock frequency, push-pull output type, and 24-TSSOP packaging. PCA9555PW,118 is supplied by NXP USA Inc. in Cut Tape and Digi-Reel packaging with 52826 units in stock. TCA9555PWR is supplied by Texas Instruments in Cut Tape and Digi-Reel packaging with 55545 units in stock. Both parts are active products with ROHS3 compliance. The primary difference is packaging format; selection depends on procurement and assembly requirements.

Functional Alternative (Limited Substitution):

NLVPCA9535EDTR2G, manufactured by onsemi, provides 16-bit I/O expansion in 24-TSSOP packaging with I2C interface support. This part operates at 100 kHz clock frequency (reduced from 400 kHz) and features open-drain output configuration (versus push-pull). The supply voltage range extends to 1.65V minimum and operating temperature range extends to -55°C to 125°C. This part is marked as obsolete and should be considered only when legacy system compatibility is required. Current inventory is 5668 units.

Selection Criteria:

For new designs and active production environments, PCA9555PW,118 or TCA9555PWR are preferred due to active product status, full 400 kHz SMBus compliance, and push-pull output capability. NLVPCA9535EDTR2G is suitable only for replacement in existing systems where the reduced clock frequency and open-drain output are compatible with circuit design requirements.

Frequently Asked Questions (FAQ)

Q: Can PCA9555PW,118 directly replace PCA9555PW,112 in existing designs?

A: Yes. Both parts are NXP products with identical electrical specifications: 16-bit I/O, 400 kHz I2C/SMBus interface, push-pull output, 24-TSSOP package, and -40°C to 85°C operating range. The difference is packaging format (tube versus cut tape/digi-reel). PCB layout and firmware require no modification.

Q: Is TCA9555PWR compatible with PCA9555PW,112?

A: Yes, with one consideration. TCA9555PWR is a Texas Instruments equivalent with identical I/O count, clock frequency, output type, and package. The supply voltage range is wider (1.65V minimum versus 2.3V minimum). If your system operates above 2.3V, TCA9555PWR is a direct substitute. If your system requires operation below 2.3V, verify compatibility before substitution.

Q: Why is NLVPCA9535EDTR2G listed as a substitute if it operates at 100 kHz?

A: NLVPCA9535EDTR2G is listed as a functional alternative for legacy system replacement only. The 100 kHz clock frequency is incompatible with SMBus 400 kHz requirements but may be acceptable in I2C-only applications with slower communication requirements. The open-drain output requires external pull-up resistors, differing from the push-pull configuration of the main part. This part is obsolete and not recommended for new designs.

Q: Are all substitute parts available in the same package?

A: Yes. All listed parts use 24-TSSOP (0.173", 4.40mm width) surface-mount packaging, ensuring identical PCB footprint compatibility. Packaging format differs (tube, cut tape, or tape & reel), but the physical component dimensions and pin configuration are identical.

Q: What compliance certifications apply to these parts?

A: All parts listed are ROHS3 compliant and REACH unaffected. All parts carry EAR99 export classification and HTSUS code 8542.39.0001. Moisture sensitivity level is 1 (unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Q: Can I use NLVPCA9535EDTR2G in a new SMBus application?

A: No. NLVPCA9535EDTR2G operates at 100 kHz maximum frequency, which does not meet SMBus 400 kHz specification. Use PCA9555PW,118 or TCA9555PWR for SMBus compliance. NLVPCA9535EDTR2G is suitable only for I2C applications with lower communication speed requirements.