PCA9535ECDTR2G Equivalent & Substitute Parts

Part Overview

The PCA9535ECDTR2G is a 16-bit I/O expander with I2C and SMBus interface operating at 100 kHz, manufactured by onsemi in 24-TSSOP surface mount packaging. This device features open drain output configuration with 25 mA source/sink capability and power-on reset functionality. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

PCA9535ECDTR2G

onsemiIn Stock: 36200PCA9535ECDTR2G Datasheet

Current PartRFQ

PCA9535CPW,118

NXP USA Inc.In Stock: 3285PCA9535CPW,118 Datasheet

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PCA9535PW,112

NXP SemiconductorsIn Stock: 1976PCA9535PW,112 Datasheet

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PCA9535PW,118

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

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PCA9555PW,112

NXP SemiconductorsIn Stock: 4902PCA9555PW,112 Datasheet

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PCA9555PW,118

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

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PI4IOE5V9555LEX

Diodes IncorporatedIn Stock: 3245PI4IOE5V9555LEX Datasheet

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TCA9535PWR

Texas InstrumentsIn Stock: 5506TCA9535PWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the PCA9535ECDTR2G is determined by the following critical parameters:

• I/O Count: 16-bit configuration required
• Interface Protocol: I2C and/or SMBus compatibility
• Package Type: 24-TSSOP surface mount form factor
• Voltage Supply Range: Minimum 1.65V support preferred for full compatibility
• Operating Temperature Range: Extended range (-55°C to 125°C) preferred
• Output Configuration: Open drain or push-pull acceptable with equivalent current ratings

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents (PCA9535 Base): Parts maintaining the same base product number with enhanced clock frequency (400 kHz) and active product status. These include PCA9535CPW,118, PCA9535PW,112, and PCA9535PW,118.

Category B - Enhanced Alternatives (PCA9555 Base & Other Manufacturers): Parts with identical I/O count and interface but different base product numbers or manufacturers, including PCA9555PW,112, PCA9555PW,118, PI4IOE5V9555LEX, and TCA9535PWR.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

PCA9535CPW,118 and PCA9535PW,118 are the preferred substitutes, maintaining the PCA9535 base product number with active product status and ROHS3 compliance. PCA9535CPW,118 preserves the open drain output configuration of the original part. Both operate at 400 kHz, providing improved performance over the 100 kHz original specification while maintaining full I2C and SMBus compatibility.

Secondary Substitutes (Compatible Alternatives)

PCA9535PW,112 offers identical functionality to PCA9535PW,118 with push-pull output configuration and tube packaging instead of cut tape. TCA9535PWR from Texas Instruments maintains the full 1.65V ~ 5.5V supply voltage range matching the original part, with active product status and ROHS3 compliance.

Extended Alternatives (PCA9555 Series)

PCA9555PW,112 and PCA9555PW,118 provide equivalent I/O expansion with enhanced specifications. PCA9555PW,118 offers the highest inventory availability (52,826 pcs) with active product status and full compliance certifications.

Cross-Manufacturer Option

PI4IOE5V9555LEX from Diodes Incorporated provides 16-bit I/O expansion in 24-TSSOP packaging with 400 kHz I2C operation and 2.3V ~ 5.5V supply range. This option is suitable for applications where manufacturer diversification is required.

Voltage Supply Consideration

Applications requiring operation below 2.3V should prioritize TCA9535PWR, which maintains the 1.65V minimum supply voltage of the original PCA9535ECDTR2G.

Temperature Range Consideration

The original part operates to -55°C. All substitute parts operate to -40°C minimum. Applications requiring extended low-temperature operation below -40°C must retain the original PCA9535ECDTR2G or identify alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can PCA9535PW,118 directly replace PCA9535ECDTR2G?

A: Yes, with operational considerations. Both are 16-bit I2C/SMBus I/O expanders in 24-TSSOP packaging with identical pinout. The substitute operates at 400 kHz versus 100 kHz and has a reduced operating temperature range (-40°C to 85°C versus -55°C to 125°C). Voltage supply range is reduced to 2.3V ~ 5.5V. Verify application requirements for clock frequency, temperature, and supply voltage compatibility.

Q: What is the difference between open drain and push-pull output configurations?

A: The original PCA9535ECDTR2G features open drain outputs, while most substitutes (PCA9535PW,112, PCA9535PW,118, PCA9555 series, TCA9535PWR) use push-pull outputs. Open drain requires external pull-up resistors and is suitable for multi-master I2C applications. Push-pull outputs provide active high and low drive. Application circuit design must accommodate the selected output type.

Q: Is PCA9535CPW,118 a better choice than PCA9535PW,118?

A: PCA9535CPW,118 maintains the open drain output configuration of the original part, making it the preferred direct replacement if the application circuit relies on open drain characteristics. PCA9535PW,118 uses push-pull outputs and may require circuit modifications. Both are active products with identical I/O count, interface, and package.

Q: Can I use PCA9555PW,118 instead of PCA9535ECDTR2G?

A: Yes. Both devices provide 16-bit I2C/SMBus I/O expansion in 24-TSSOP packaging. The PCA9555 series is functionally compatible with PCA9535 devices. Verify that application firmware or hardware does not depend on device-specific register layouts or addressing schemes. PCA9555PW,118 has the highest inventory availability among all substitutes.

Q: What is the impact of the 400 kHz clock frequency on my application?

A: The substitute parts operate at 400 kHz I2C clock frequency versus 100 kHz on the original. This provides faster I/O expansion communication and is backward compatible with 100 kHz I2C bus implementations. No application changes are required; the device will operate at the bus speed negotiated by the I2C master.

Q: Does the reduced voltage supply range (2.3V minimum) affect my design?

A: If your application operates below 2.3V, use TCA9535PWR, which maintains the 1.65V minimum supply voltage of the original part. Most substitute parts specify 2.3V ~ 5.5V. Verify your system supply voltage against the selected substitute's minimum specification.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the original PCA9535ECDTR2G.

Q: What packaging options are available?

A: Substitutes are available in Cut Tape (CT) & Digi-Reel packaging (PCA9535CPW,118, PCA9535PW,118, PI4IOE5V9555LEX, TCA9535PWR) and Tube packaging (PCA9535PW,112, PCA9555PW,112). Select based on your procurement and assembly requirements.