PCA9535RGER I/O Expander 16-Bit I2C Interface

Part Overview

The PCA9535RGER is a 16-bit I/O expander manufactured by Texas Instruments, designed for I2C and SMBus communication at 400 kHz. This interface IC operates across a supply voltage range of 2.3V to 5.5V and is housed in a 24-VQFN surface mount package. The device is currently in active production status with extensive inventory availability. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required for design flexibility, supply chain optimization, or manufacturing continuity.

Substiute Parts

PCA9535RGER

Texas InstrumentsIn Stock: 54765PCA9535RGER Datasheet

Current PartRFQ

PCA9535BS,118

NXP SemiconductorsIn Stock: 5832PCA9535BS,118 Datasheet

MFR RecommendedRFQ

PI4IOE5V9535ZDEX

Diodes IncorporatedIn Stock: 24931PI4IOE5V9535ZDEX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA9535RGER are qualified based on the following critical parameters:

• 16-bit I/O configuration
• I2C protocol support at 400 kHz minimum clock frequency
• Supply voltage compatibility within 2.3V to 5.5V range
• Operating temperature range of -40°C to 85°C
• Surface mount packaging in 24-pin QFN format
• Push-pull output capability with specified current ratings
• Interrupt output functionality
• RoHS3 compliance and equivalent regulatory status

The identified substitutes maintain functional equivalence across these core electrical and mechanical specifications, enabling direct replacement in circuit designs without modification to PCB layout or firmware logic.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active production status and ROHS3 compliance, qualifying them for equivalent use in applications requiring 16-bit I2C I/O expansion at 400 kHz. The PCA9535RGER and PCA9535BS,118 share identical electrical specifications including push-pull output configuration and current ratings, with the primary distinction being package variant (VQFN versus HVQFN) and moisture sensitivity level. The PI4IOE5V9535ZDEX from Diodes Incorporated provides functional I2C compatibility and identical voltage and temperature specifications, though detailed output specifications are not provided in the available data.

Selection between these parts should be based on PCB layout requirements specific to the QFN package variant, supply chain availability, and moisture handling requirements for the intended manufacturing environment.

Frequently Asked Questions (FAQ)

Q: Can PCA9535BS,118 directly replace PCA9535RGER on an existing PCB?

A: The PCA9535BS,118 uses a 24-HVQFN package while the PCA9535RGER uses 24-VQFN. Both are 4x4mm QFN packages with identical pin counts and electrical specifications. PCB footprint compatibility must be verified, as HVQFN and VQFN variants may have minor dimensional differences affecting solder pad layout.

Q: What is the difference between the NXP and Diodes substitutes?

A: Both maintain I2C 400 kHz operation and identical supply voltage and temperature ranges. The PCA9535BS,118 provides complete electrical specifications including push-pull output and current ratings. The PI4IOE5V9535ZDEX offers equivalent I2C functionality with unspecified output characteristics. The NXP part carries a lower moisture sensitivity level (1 versus 2), providing extended shelf life without baking.

Q: Are all three parts suitable for SMBus applications?

A: The PCA9535RGER and PCA9535BS,118 explicitly support both I2C and SMBus protocols. The PI4IOE5V9535ZDEX is specified for I2C operation; SMBus compatibility is not documented in the available parameters.

Q: What package considerations apply to these substitutes?

A: All three parts use 24-pin QFN surface mount packages in 4x4mm form factor. The specific QFN variant (VQFN, HVQFN, or TQFN) determines exact pad dimensions and thermal characteristics. Verify footprint compatibility with your PCB design before selecting a substitute.

Q: Do moisture sensitivity differences affect component selection?

A: The PCA9535RGER carries MSL 2 (1 Year), requiring baking before reflow if shelf life exceeds one year. Both substitute parts carry MSL 1 (Unlimited), eliminating moisture management requirements. For high-volume or long-lead-time applications, MSL 1 parts reduce manufacturing complexity.