PCA9557PW,112 Equivalent & Substitute Parts

Part Overview

The PCA9557PW,112 is an 8-bit I/O expander interface circuit manufactured by NXP USA Inc., designed for I2C and SMBus communication at 400 kHz. This component operates across a supply voltage range of 2.3V to 5.5V and features open drain and push-pull output configurations with 10mA and 25mA source/sink capabilities. The part is classified as obsolete, necessitating identification of equivalent alternatives for ongoing design support and procurement continuity.

Substiute Parts

PCA9557PW,112

NXP USA Inc.In Stock: 1189PCA9557PW,112 Datasheet

Current PartRFQ

PCA9557PW,118

NXP USA Inc.In Stock: 40470PCA9557PW,118 Datasheet

MFR RecommendedRFQ

PCA9557PW

Texas InstrumentsIn Stock: 55298PCA9557PW Datasheet

DirectRFQ

PCA9557PWR

Texas InstrumentsIn Stock: 30955PCA9557PWR Datasheet

MFR RecommendedRFQ

PCA9557PWT

Texas InstrumentsIn Stock: 1648PCA9557PWT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9557PW,112 is determined by strict equivalence across the following critical parameters: 8 I/O configuration, I2C/SMBus interface protocol, 400 kHz clock frequency, 2.3V to 5.5V supply voltage range, -40°C to 85°C operating temperature, open drain and push-pull output types, 10mA and 25mA current capabilities, and 16-TSSOP surface mount package. All substitute parts listed maintain these electrical and mechanical specifications. Packaging format variations (tube, cut tape, digi-reel) do not affect functional equivalence but may impact procurement and handling requirements.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing procurement, PCA9557PWR (Texas Instruments) is the primary recommended substitute. This part maintains full electrical and mechanical equivalence to the PCA9557PW,112 while offering active product status, ensuring long-term availability and manufacturing support. The PCA9557PWR provides identical current output specifications (10mA, 25mA) and operates within the same supply voltage and temperature ranges.

PCA9557PW,118 (NXP USA Inc.) serves as an alternative active-status substitute with equivalent functionality. This part differs only in maximum sink current specification (20mA versus 25mA), which remains suitable for applications not requiring the full 25mA sink capability.

Obsolete variants (PCA9557PW, PCA9557PWT) are available in existing inventory but should not be selected for new designs due to discontinued product status. These parts are electrically equivalent but lack manufacturing continuity guarantees.

All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can PCA9557PW,118 replace PCA9557PW,112 in existing designs? A: Yes. PCA9557PW,118 maintains all critical electrical parameters including 8 I/O configuration, I2C/SMBus 400 kHz interface, 2.3V to 5.5V supply range, and -40°C to 85°C operating temperature. The maximum sink current specification is 20mA versus 25mA; applications requiring only 20mA or less sink current experience no functional difference.

Q: What is the difference between PCA9557PWR and PCA9557PW,112? A: Both parts are electrically and mechanically equivalent with identical I/O count, interface protocol, clock frequency, supply voltage, operating temperature, and output current specifications. The primary difference is product status: PCA9557PWR is active with ongoing manufacturing support, while PCA9557PW,112 is obsolete. Packaging format may differ (cut tape/digi-reel versus tube).

Q: Are all substitute parts in the same 16-TSSOP package? A: Yes. All listed substitute parts use the 16-TSSOP surface mount package with 0.173" width and 4.40mm dimensions, ensuring direct PCB footprint compatibility.

Q: Do packaging format variations affect electrical performance? A: No. Packaging formats (tube, cut tape, digi-reel) are procurement and handling specifications only. Electrical and mechanical performance remains identical across all packaging options for the same part number variant.

Q: Which substitute should be selected for new production designs? A: PCA9557PWR is the recommended selection for new designs. This part offers active product status, full electrical equivalence, and long-term manufacturing availability.