PCA9535PW I/O Expander 16-Bit I2C Interface

Part Overview

The PCA9535PW is a 16-bit I/O expander designed for I2C and SMBus communication at 400 kHz clock frequency. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part operates across a supply voltage range of 2.3V to 5.5V and is housed in a 24-TSSOP surface mount package. Active alternatives from both Texas Instruments and NXP Semiconductors maintain functional and electrical compatibility while offering current product status and availability.

Substiute Parts

PCA9535PW

Texas InstrumentsIn Stock: 63113PCA9535PW Datasheet

Current PartRFQ

TCA9535PWR

Texas InstrumentsIn Stock: 5506TCA9535PWR Datasheet

MFR RecommendedRFQ

PCA9535PW,112

NXP SemiconductorsIn Stock: 1976PCA9535PW,112 Datasheet

MFR RecommendedRFQ

PCA9535PW,118

NXP USA Inc.In Stock: 4174PCA9535PW,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9535PW is determined by strict equivalence across the following critical parameters: 16 I/O lines, I2C/SMBus interface protocol, 400 kHz clock frequency, push-pull output configuration, interrupt output capability, and identical 24-TSSOP package dimensions. All identified substitutes maintain these core electrical and mechanical specifications. Voltage supply range variations exist between the main part (2.3V ~ 5.5V) and one substitute option (1.65V ~ 5.5V), which represents an extended lower voltage capability and does not restrict substitution in applications requiring the original voltage range. All substitutes are RoHS3 compliant with MSL 1 rating, matching the original part's environmental and regulatory status.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts maintain full electrical and functional equivalence to the PCA9535PW. The primary distinction is product status: the original PCA9535PW is obsolete, while TCA9535PWR, PCA9535PW,112, and PCA9535PW,118 are all active products with current manufacturing and supply availability. TCA9535PWR offers extended lower voltage operation (1.65V minimum) compared to the original specification (2.3V minimum), providing additional design flexibility for low-power applications. Both NXP variants (PCA9535PW,112 and PCA9535PW,118) maintain the original voltage specification of 2.3V ~ 5.5V. All substitutes carry ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility with the original part. Selection between substitutes should be based on packaging preference (tube versus cut tape/reel format) and manufacturer preference within your supply chain.

Frequently Asked Questions (FAQ)

Q: Can TCA9535PWR replace PCA9535PW in all applications? A: Yes. TCA9535PWR maintains all critical electrical parameters including 16 I/O lines, I2C/SMBus 400 kHz interface, push-pull output configuration, and identical 24-TSSOP package. The extended lower voltage range (1.65V minimum versus 2.3V minimum) does not restrict compatibility in applications designed for the original voltage specification.

Q: What is the difference between PCA9535PW,112 and PCA9535PW,118? A: Both parts are functionally and electrically identical. The primary difference is packaging format: PCA9535PW,112 is supplied in tube packaging, while PCA9535PW,118 is supplied in cut tape and Digi-Reel format. Selection depends on your assembly process requirements and inventory management preferences.

Q: Are all substitutes RoHS3 compliant? A: Yes. All three substitute parts (TCA9535PWR, PCA9535PW,112, and PCA9535PW,118) are ROHS3 compliant with MSL 1 rating, matching the environmental and regulatory status of the original PCA9535PW.

Q: Why is the original PCA9535PW marked as obsolete? A: The PCA9535PW has been discontinued by Texas Instruments. Active alternatives from both Texas Instruments (TCA9535PWR) and NXP (PCA9535PW,112 and PCA9535PW,118) provide equivalent functionality and are recommended for new designs and production continuity.

Q: Can I use these substitutes in existing designs without PCB modifications? A: Yes. All substitutes use the identical 24-TSSOP package with matching pin configuration and electrical specifications, allowing direct replacement without PCB layout changes.

Q: What is the difference in supply voltage range between TCA9535PWR and the other substitutes? A: TCA9535PWR operates from 1.65V to 5.5V, while PCA9535PW,112 and PCA9535PW,118 operate from 2.3V to 5.5V. The extended lower voltage capability of TCA9535PWR does not affect compatibility with designs requiring the original 2.3V minimum specification.