PCA9538PW,118 Equivalent & Substitute Parts

Part Overview

The PCA9538PW,118 is an 8-bit I/O expander interface circuit manufactured by NXP Semiconductors, designed for I2C and SMBus communication at 400 kHz. This device provides push-pull output capability with configurable source/sink current (10mA, 25mA) and includes power-on reset (POR) functionality. The component is actively produced and RoHS3 compliant, making it suitable for industrial and commercial applications requiring I/O expansion in space-constrained environments.

Equivalent and substitute parts become necessary when the primary part experiences supply constraints, lead time extensions, or when design flexibility permits selection from multiple qualified sources meeting identical electrical and mechanical specifications.

Substiute Parts

PCA9538PW,118

NXP SemiconductorsIn Stock: 3151PCA9538PW,118 Datasheet

Current PartRFQ

PCA9538PWR

Texas InstrumentsIn Stock: 16821PCA9538PWR Datasheet

DirectRFQ

TCA6408APWR

Texas InstrumentsIn Stock: 58418TCA6408APWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PCA9538PW,118 is determined by strict equivalence across the following critical parameters:

• I/O Configuration: 8-bit expander architecture
• Communication Protocol: I2C and SMBus compatibility at 400 kHz
• Output Characteristics: Push-pull topology with 10mA and 25mA source/sink capability
• Package Specification: 16-TSSOP form factor with identical 0.173" (4.40mm) width
• Supply Voltage Range: Minimum 2.3V operation required
• Temperature Rating: -40°C to 85°C operational envelope
• Compliance: RoHS3 and REACH compliance status

Substitute parts must maintain identical electrical performance across all specified parameters. Physical package compatibility and pin-to-pin functional equivalence are mandatory requirements.

Parameter Comparison

Engineering Selection Recommendations

PCA9538PWR (Texas Instruments) is a direct functional equivalent to the PCA9538PW,118. Both devices share identical electrical specifications, package geometry, and compliance certifications. Selection between these parts is determined by supply availability and procurement lead times, as they are functionally interchangeable.

TCA6408APWR (Texas Instruments) meets all specified electrical and mechanical requirements with one exception: the supply voltage minimum is 1.65V compared to 2.3V for the primary part. This extended lower voltage range does not create incompatibility in applications designed for the PCA9538PW,118, as the TCA6408APWR operates within the 2.3V ~ 5.5V envelope when used in such designs. The device maintains identical I/O count, interface protocol, output characteristics, temperature rating, package specification, and compliance status. The TCA6408APWR is suitable for applications requiring the specified 2.3V ~ 5.5V supply range.

All three parts are actively produced and RoHS3 compliant, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can PCA9538PWR replace PCA9538PW,118 in existing designs?

A: Yes. The PCA9538PWR is electrically and mechanically equivalent. Both devices feature identical I/O configuration, I2C/SMBus protocol support at 400 kHz, push-pull output topology, source/sink current ratings, supply voltage range (2.3V ~ 5.5V), operating temperature range, 16-TSSOP package geometry, and compliance certifications. Direct substitution is supported without design modification.

Q: What is the key difference between TCA6408APWR and PCA9538PW,118?

A: The TCA6408APWR has a lower minimum supply voltage specification (1.65V versus 2.3V). All other electrical parameters—I/O count, interface protocol, clock frequency, output type, source/sink current, operating temperature, and package specification—are identical. The TCA6408APWR is compatible with designs specified for 2.3V ~ 5.5V operation.

Q: Are all three parts pin-to-pin compatible?

A: Yes. All three parts use the 16-TSSOP package with identical pin assignments and functional equivalence. Physical layout compatibility is maintained across all three devices.

Q: Do packaging differences affect substitution eligibility?

A: The primary part is supplied in Tape & Reel (TR) format, while the substitute parts are available in Cut Tape (CT) and Digi-Reel® formats. These are packaging and delivery method variations only and do not affect electrical performance or board-level compatibility.

Q: Are all parts RoHS3 compliant?

A: Yes. PCA9538PW,118, PCA9538PWR, and TCA6408APWR are all RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for industrial and commercial applications.