FSUSB40L10X Equivalent & Substitute Parts

Part Overview

The FSUSB40L10X is a USB Switch IC manufactured by onsemi, designed for single-channel DPDT switching applications in USB 2.0 systems. This component features break-before-make switching logic with a 720MHz bandwidth and operates across a 3V to 4.3V supply range. The part is classified as obsolete, making identification of active equivalent components essential for new designs and ongoing production support.

Substiute Parts

FSUSB40L10X

onsemiIn Stock: 24941FSUSB40L10X Datasheet

Current PartRFQ

FSUSB42MUX

onsemiIn Stock: 65316FSUSB42MUX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSUSB40L10X is determined by the following critical parameters:

• Switch Circuit Configuration: DPDT topology with single-channel operation
• On-State Resistance: Maximum 6.5Ω specification
• Bandwidth Performance: 720MHz -3dB bandwidth for USB 2.0 signal integrity
• Supply Voltage Range: Compatible voltage operation window
• Break-Before-Make Logic: Switching sequence requirement
• Surface Mount Compatibility: Package form factor and mounting technology
• Compliance Standards: RoHS3 and REACH status alignment

The FSUSB42MUX qualifies as a direct substitute based on matching all critical electrical parameters and maintaining equivalent functional performance within the USB 2.0 interface category.

Parameter Comparison

Engineering Selection Recommendations

The FSUSB42MUX is the manufacturer-recommended substitute for the obsolete FSUSB40L10X. Both components maintain identical electrical specifications for switch resistance, bandwidth, and operating temperature range. The FSUSB42MUX offers an expanded supply voltage range (2.4V to 4.4V versus 3V to 4.3V), providing additional design flexibility while remaining fully backward-compatible with the original specification window.

Both parts carry ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring equivalent environmental and regulatory standing. The primary design consideration is the package transition from 10-UFQFN to 10-MSOP form factor, which requires PCB layout modification but does not affect electrical performance or functional compatibility.

The FSUSB42MUX is currently in active production status with substantial inventory availability, making it the appropriate choice for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can the FSUSB42MUX directly replace the FSUSB40L10X without circuit modification?

A: Electrical substitution is direct. The FSUSB42MUX matches all critical electrical parameters including on-state resistance, bandwidth, supply voltage range, and switching logic. However, the package form factor differs (10-MSOP versus 10-UFQFN), requiring PCB layout redesign.

Q: What is the key difference between these two parts?

A: The primary difference is package form factor and product status. The FSUSB40L10X uses a 10-UFQFN Exposed Pad package and is obsolete. The FSUSB42MUX uses a 10-MSOP package and is in active production. Electrical performance is equivalent.

Q: Does the FSUSB42MUX support the same supply voltage as the FSUSB40L10X?

A: The FSUSB42MUX supply range (2.4V to 4.4V) encompasses the FSUSB40L10X range (3V to 4.3V). Designs operating within the original 3V to 4.3V window are fully compatible.

Q: Are both parts RoHS compliant?

A: Yes. Both the FSUSB40L10X and FSUSB42MUX are ROHS3 compliant with identical moisture sensitivity levels (MSL 1, Unlimited).

Q: Why is the FSUSB40L10X marked as obsolete?

A: The FSUSB40L10X is obsolete due to product lifecycle management by onsemi. The FSUSB42MUX represents the active equivalent in the product family and is the recommended replacement for ongoing designs.