PCA9655EDWR2G Equivalent & Substitute Parts

Part Overview

The PCA9655EDWR2G is a 16-bit I/O expander interface IC designed for I2C and SMBus communication at 100 kHz clock frequency. Manufactured by onsemi, this device operates across a wide supply voltage range of 1.65V to 5.5V and supports operating temperatures from -55°C to 125°C. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

PCA9655EDWR2G

onsemiIn Stock: 87331PCA9655EDWR2G Datasheet

Current PartRFQ

MAX7311AWG+

Analog Devices Inc./Maxim IntegratedIn Stock: 29967MAX7311AWG+ Datasheet

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MAX7318AWG+

Analog Devices Inc./Maxim IntegratedIn Stock: 2784MAX7318AWG+ Datasheet

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PCA9535DWR

Texas InstrumentsIn Stock: 8358PCA9535DWR Datasheet

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PCA9555D,112

NXP USA Inc.In Stock: 2368PCA9555D,112 Datasheet

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PCA9555DW

Texas InstrumentsIn Stock: 2085PCA9555DW Datasheet

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PCF8575DWR

Texas InstrumentsIn Stock: 6392PCF8575DWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PCA9655EDWR2G is determined by the following critical parameters:

Core Functional Requirements:

• 16-bit I/O configuration
• I2C and SMBus interface support
• Push-pull output type
• Interrupt output capability
• Power-on reset (POR) feature

Electrical Compatibility Criteria:

• Supply voltage range must encompass or overlap with 1.65V ~ 5.5V
• Operating temperature range must support -55°C ~ 125°C or be suitable for the intended application
• Output current capability (source/sink) must meet or exceed application requirements
• Clock frequency must support I2C/SMBus communication at required speeds

Physical Compatibility:

• 24-SOIC package form factor
• Surface mount mounting type

The substitute parts listed operate at 400 kHz clock frequency, which is backward compatible with 100 kHz I2C/SMBus systems. However, differences in supply voltage ranges, operating temperature limits, and output current specifications must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

MAX7311AWG+ and MAX7318AWG+ (Analog Devices/Maxim Integrated)

These parts provide the closest electrical compatibility to the PCA9655EDWR2G. Both maintain the extended upper operating temperature of 125°C and support a minimum supply voltage of 2V. Output current specifications (31mA, 43mA) align well with the original 42mA rating. Both parts are active products with ROHS3 compliance and superior moisture sensitivity ratings (MSL 1). The 400 kHz clock frequency is backward compatible with 100 kHz I2C/SMBus systems. Selection between MAX7311AWG+ and MAX7318AWG+ depends on inventory availability and application-specific requirements.

PCA9535DWR (Texas Instruments)

This part maintains the same base product family (PCA953x series) and offers active product status. It supports the required 16-bit I/O configuration and I2C/SMBus interface. However, the operating temperature range is limited to -40°C ~ 85°C, which does not cover the extended low-temperature specification of the original part. Output current specifications (10mA, 25mA) are lower than the original. This part is suitable for applications not requiring the extended temperature range.

PCA9555D,112 (NXP USA Inc.)

This NXP part provides 16-bit I/O expansion with I2C/SMBus support and active product status. Operating temperature range (-40°C ~ 85°C) and output current specifications (10mA, 25mA) are identical to the PCA9535DWR. The minimum supply voltage of 2.3V is higher than the original 1.65V specification. This part is suitable for applications operating within the specified temperature and voltage ranges.

PCF8575DWR (Texas Instruments)

This part offers active product status and maintains the 24-SOIC package form factor. However, the output current source/sink specification (1mA, 25mA) is significantly lower than the original 42mA, particularly for source current. The operating temperature range (-40°C ~ 85°C) and minimum supply voltage (2.5V) are more restrictive than the original. This part is suitable only for applications with lower output current requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz substitute part in a 100 kHz I2C/SMBus system?

A: Yes. The 400 kHz clock frequency specification indicates the maximum supported speed. All substitute parts listed operate at 400 kHz and are backward compatible with 100 kHz I2C/SMBus systems. The communication speed is determined by the master device, not the I/O expander.

Q: What is the significance of the supply voltage range difference?

A: The PCA9655EDWR2G supports operation down to 1.65V, while most substitutes require a minimum of 2V or higher. If your application operates below 2V, only the MAX7311AWG+ or MAX7318AWG+ are suitable alternatives. For applications operating at 2V or above, all listed substitutes are electrically compatible.

Q: Why do some substitutes have lower output current ratings?

A: Output current capability varies by manufacturer design. The PCA9535DWR, PCA9555D,112, and PCF8575DWR have lower source/sink current specifications than the original. If your application requires the full 42mA output current, verify that the substitute part's current rating meets your load requirements. The MAX7311AWG+ and MAX7318AWG+ provide comparable current capability (43mA sink).

Q: Does the operating temperature range affect substitution?

A: Yes. The PCA9655EDWR2G operates from -55°C to 125°C. Most substitutes are limited to -40°C ~ 85°C. If your application requires operation below -40°C or above 85°C, only the MAX7311AWG+ and MAX7318AWG+ support the extended upper temperature of 125°C. For applications within -40°C ~ 85°C, all listed parts are suitable.

Q: Are all substitute parts in the same 24-SOIC package?

A: All listed substitute parts use the 24-SOIC (0.295", 7.50mm Width) package form factor, ensuring direct physical compatibility with the original PCA9655EDWR2G. PCB layout and footprints require no modification.

Q: What does the MSL (Moisture Sensitivity Level) rating mean for substitution?

A: The PCA9655EDWR2G has an MSL rating of 3 (168 hours), while all substitute parts have MSL 1 (unlimited). Lower MSL ratings indicate better moisture resistance and longer shelf life. Substitute parts with MSL 1 provide superior moisture handling characteristics, which is advantageous for long-term storage and reliability.

Q: Which substitute part is the best overall replacement?

A: The MAX7311AWG+ or MAX7318AWG+ provide the most comprehensive compatibility with the original PCA9655EDWR2G, supporting the extended temperature range to 125°C, lower minimum supply voltage (2V), and comparable output current (43mA). Selection depends on inventory availability and specific application constraints.