PCA9538PW,112 Equivalent & Substitute Parts

Part Overview

The PCA9538PW,112 is an 8-channel I/O expander IC designed for I2C and SMBus communication at 400 kHz, manufactured by NXP USA Inc. in a 16-TSSOP surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part provides push-pull output capability with configurable interrupt output and power-on reset (POR) functionality, operating across a 2.3V to 5.5V supply voltage range.

Substiute Parts

PCA9538PW,112

NXP USA Inc.In Stock: 993PCA9538PW,112 Datasheet

Current PartRFQ

PCA9538PWR

Texas InstrumentsIn Stock: 16821PCA9538PWR Datasheet

MFR RecommendedRFQ

TCA6408APWR

Texas InstrumentsIn Stock: 58418TCA6408APWR Datasheet

MFR RecommendedRFQ

TCA9538PWR

Texas InstrumentsIn Stock: 2342TCA9538PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA9538PW,112 are selected based on strict electrical and mechanical compatibility criteria. The following parameters must match or be compatible:

• Number of I/O Channels: Must be 8
• Interface Protocol: Must support I2C at 400 kHz minimum
• Package / Case: Must be 16-TSSOP with identical 0.173" (4.40mm) width
• Mounting Type: Must be Surface Mount
• Output Type: Must be Push-Pull
• Interrupt Output: Must be present
• Operating Temperature Range: Must cover -40°C to 85°C
• RoHS Compliance: Must be ROHS3 Compliant

All three substitute parts meet these criteria and are pin-compatible alternatives suitable for direct replacement in existing designs.

Parameter Comparison

Engineering Selection Recommendations

PCA9538PWR (Texas Instruments) is the primary substitute option. It maintains identical electrical specifications to the original PCA9538PW,112, including supply voltage range (2.3V ~ 5.5V) and output current ratings (10mA, 25mA). This part is in active production status with substantial inventory availability (16,723 units), ensuring long-term supply continuity.

TCA6408APWR (Texas Instruments) is a compatible alternative with extended lower voltage capability (1.65V ~ 5.5V versus 2.3V ~ 5.5V). This part supports both I2C and SMBus protocols and maintains all other critical parameters. Inventory availability is highest among substitutes (58,400 units), providing supply security.

TCA9538PWR (Texas Instruments) is functionally compatible with I2C interface support at 400 kHz. Output current specifications are not provided for this variant. This part is in active production with moderate inventory (2,300 units).

All three substitutes are ROHS3 compliant and carry identical moisture sensitivity ratings (MSL 1 - Unlimited), ensuring compliance with environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can PCA9538PWR be used as a direct replacement for PCA9538PW,112?

A: Yes. PCA9538PWR is electrically and mechanically identical to the original part, with matching pin configuration, supply voltage range (2.3V ~ 5.5V), output current specifications (10mA, 25mA), and operating temperature range (-40°C ~ 85°C). Both are housed in 16-TSSOP packages with identical dimensions.

Q: What is the difference between TCA6408APWR and the other substitutes?

A: TCA6408APWR extends the lower supply voltage limit to 1.65V, compared to 2.3V for PCA9538PWR and TCA9538PWR. All other electrical and mechanical parameters remain compatible. This extended voltage range may be beneficial for low-power applications.

Q: Are all substitute parts pin-compatible with the original PCA9538PW,112?

A: Yes. All three substitute parts use the 16-TSSOP package with identical pin assignments and electrical characteristics, enabling direct PCB replacement without design modifications.

Q: What is the significance of the obsolete status for PCA9538PW,112?

A: Obsolete status indicates the original part is no longer manufactured by NXP USA Inc. All three substitute parts are in active production status, ensuring availability for new designs and production continuity.

Q: Do all substitutes support SMBus protocol?

A: PCA9538PWR and TCA6408APWR explicitly support both I2C and SMBus protocols. TCA9538PWR supports I2C protocol at 400 kHz. Verify SMBus requirement against your specific application needs.

Q: Are there any compliance differences between the main part and substitutes?

A: No. All parts are ROHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity ratings, and are REACH unaffected. Compliance certifications are identical across all options.