FSUSB23L10X USB Switch IC Equivalent & Substitute Parts

Part Overview

The FSUSB23L10X is a USB Switch IC manufactured by onsemi, designed for single-channel USB 2.0 switching applications. This component features a DPDT (Double Pole Double Throw) switch circuit in a 10-MicroPak™ package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and component procurement.

Substiute Parts

FSUSB23L10X

onsemiIn Stock: 3348FSUSB23L10X Datasheet

Current PartRFQ

FSUSB42UMX

onsemiIn Stock: 285405FSUSB42UMX Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSUSB23L10X is determined by the following critical parameters:

• Switch Circuit Configuration: DPDT topology for equivalent signal routing capability
• Number of Channels: Single-channel operation matching the original design
• Bandwidth Performance: 720 MHz minimum to maintain USB 2.0 signal integrity
• Operating Temperature Range: -40°C to 85°C compatibility
• Package Compatibility: Surface-mount form factor with compatible pin configuration
• Supply Voltage: Acceptable range must encompass or exceed the original 3.0V ~ 3.6V specification

The FSUSB42UMX meets all substitution criteria as an active, functionally equivalent alternative from the same manufacturer family.

Parameter Comparison

Engineering Selection Recommendations

The FSUSB42UMX is the direct substitute for the obsolete FSUSB23L10X. Selection is based on the following engineering factors:

• Product Status: FSUSB42UMX maintains active production status, ensuring long-term availability and supply chain continuity
• Electrical Compatibility: Both parts operate within overlapping voltage ranges, with FSUSB42UMX supporting the full 3.0V ~ 3.6V requirement of the original design
• Performance Enhancement: FSUSB42UMX provides improved on-state resistance (6.5 Ohm vs. 10 Ohm), reducing power dissipation
• Regulatory Compliance: Both parts maintain identical REACH and ECCN classifications (EAR99), with FSUSB42UMX additionally certified as RoHS3 Compliant
• Package Compatibility: Both components use 10-UFQFN surface-mount packages with compatible pinouts
• Feature Parity: FSUSB42UMX includes Break-Before-Make functionality, providing enhanced switching performance

Frequently Asked Questions (FAQ)

Q: Can FSUSB42UMX directly replace FSUSB23L10X in existing designs?

A: Yes. Both parts share identical DPDT switch topology, single-channel configuration, 720 MHz bandwidth, and -40°C to 85°C operating temperature range. The 10-UFQFN package footprints are compatible. FSUSB42UMX operates across a wider supply voltage range (2.4V ~ 4.4V) that fully encompasses the original 3.0V ~ 3.6V specification.

Q: What is the difference in on-state resistance between these parts?

A: FSUSB23L10X specifies a maximum on-state resistance of 10 Ohm, while FSUSB42UMX specifies 6.5 Ohm. This 35% improvement in FSUSB42UMX reduces resistive losses and heat generation in switching applications.

Q: Are there package differences between FSUSB23L10X and FSUSB42UMX?

A: Both parts use 10-UFQFN surface-mount packages. FSUSB23L10X is specified as 10-UFQFN Exposed Pad, while FSUSB42UMX is specified as 10-UFQFN. Pin configurations and footprints are compatible for PCB layout purposes.

Q: Why is FSUSB23L10X classified as obsolete?

A: FSUSB23L10X has reached end-of-life status. FSUSB42UMX represents the active production equivalent within the onsemi FSUSB family, offering improved electrical performance and continued manufacturing support.

Q: What regulatory certifications apply to FSUSB42UMX?

A: FSUSB42UMX is RoHS3 Compliant and maintains REACH Unaffected status. Both parts share identical ECCN classification (EAR99) and HTSUS code (8542.39.0001).

Q: Does FSUSB42UMX include additional features compared to FSUSB23L10X?

A: FSUSB42UMX incorporates Break-Before-Make switching functionality, which ensures the switch opens before closing to prevent signal contention during transitions. Both parts support USB 2.0 applications.