PCA8575BQ,118 Equivalent & Substitute Parts

Part Overview

The PCA8575BQ,118 is a 16-channel I/O Expander with I2C interface operating at 400 kHz, manufactured by NXP USA Inc. This component is classified as Obsolete, making identification of suitable alternatives essential for ongoing system support and new design implementations. The part is housed in a 24-DHVQFN (5.5x4.6) surface mount package and operates across a wide supply voltage range of 2.3V to 5.5V with push-pull output configuration.

Substiute Parts

PCA8575BQ,118

NXP USA Inc.In Stock: 3811PCA8575BQ,118 Datasheet

Current PartRFQ

PCA8575BS,118

NXP USA Inc.In Stock: 14524PCA8575BS,118 Datasheet

DirectRFQ

SX1509QBIULTRT

Semtech CorporationIn Stock: 2173SX1509QBIULTRT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PCA8575BQ,118 are identified based on the following critical parameters that determine functional compatibility:

Core Functional Parameters:

• Number of I/O Channels: 16
• Interface Protocol: I2C
• Clock Frequency: 400 kHz
• Interrupt Output: Yes
• Operating Temperature Range: -40°C ~ 85°C
• Mounting Type: Surface Mount

Electrical Parameters:

• Output Type: Push-Pull (primary requirement)
• Current Output Capability: Source/Sink specifications
• Supply Voltage Range: Compatibility with system voltage rails

Compliance & Certification:

• RoHS Status: ROHS3 Compliant or equivalent
• Moisture Sensitivity Level: 1 (Unlimited)

The identified substitutes maintain functional equivalence across these parameters while accommodating variations in package form factor and supply voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

PCA8575BS,118 (NXP USA Inc.)

This part represents the direct substitute from the same manufacturer. It maintains identical electrical specifications, I/O count, interface protocol, and clock frequency as the PCA8575BQ,118. The primary difference is product status: PCA8575BS,118 is Active, ensuring long-term availability and supply chain continuity. Both parts share the same base product number (PCA8575) and are ROHS3 Compliant. The package form factor differs (24-HVQFN 4x4 versus 24-DHVQFN 5.5x4.6), requiring PCB layout verification. This substitute is recommended for designs requiring minimal redesign effort and maximum electrical compatibility.

SX1509QBIULTRT (Semtech Corporation)

This part provides functional equivalence with notable parameter variations. It maintains 16 I/O channels, I2C interface at 400 kHz, and interrupt output capability. Key differences include: reduced output current specifications (8mA, 15mA versus 100µA, 25mA), narrower supply voltage range (1.425V ~ 3.6V versus 2.3V ~ 5.5V), and different package form factor (28-QFN-UT versus 24-DHVQFN). The SX1509QBIULTRT is Active and RoHS Compliant. This substitute is suitable for applications where the reduced output current and lower supply voltage range are compatible with system requirements, and where the additional package pins can be accommodated in the PCB layout.

Frequently Asked Questions (FAQ)

Q: Can PCA8575BS,118 be used as a direct replacement for PCA8575BQ,118?

A: PCA8575BS,118 provides electrical and functional equivalence. Both parts share identical I/O count (16), interface protocol (I2C 400 kHz), output type (Push-Pull), current specifications (100µA, 25mA), and supply voltage range (2.3V ~ 5.5V). The package form factor differs (24-HVQFN 4x4 versus 24-DHVQFN 5.5x4.6), requiring PCB footprint verification before implementation.

Q: What are the key limitations of SX1509QBIULTRT as a substitute?

A: The SX1509QBIULTRT has reduced output current capability (8mA, 15mA versus 100µA, 25mA) and a narrower supply voltage range (1.425V ~ 3.6V versus 2.3V ~ 5.5V). These specifications must be verified against system requirements. The package contains 28 pins versus 24 pins, requiring PCB layout modification.

Q: Are all substitute parts RoHS compliant?

A: Yes. PCA8575BS,118 is ROHS3 Compliant, and SX1509QBIULTRT is RoHS Compliant. Both meet environmental compliance requirements.

Q: What is the impact of package form factor differences?

A: Package differences require PCB layout redesign. PCA8575BQ,118 uses 24-DHVQFN (5.5x4.6), PCA8575BS,118 uses 24-HVQFN (4x4), and SX1509QBIULTRT uses 28-QFN-UT (4x4). Footprint, trace routing, and thermal management considerations must be re-evaluated for each substitute.

Q: Can SX1509QBIULTRT operate at the same supply voltage as the original part?

A: No. SX1509QBIULTRT operates at 1.425V ~ 3.6V, while PCA8575BQ,118 operates at 2.3V ~ 5.5V. Systems requiring 5V operation cannot use the SX1509QBIULTRT without voltage regulation modifications.