FSUSB20L10X USB Switch IC Equivalent & Substitute Parts

Part Overview

The FSUSB20L10X 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 product is currently classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and component procurement.

Substiute Parts

FSUSB20L10X

onsemiIn Stock: 55383FSUSB20L10X Datasheet

Current PartRFQ

FSUSB42UMX

onsemiIn Stock: 285405FSUSB42UMX Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSUSB20L10X is determined by the following critical parameters:

• Switch Circuit Configuration: DPDT topology for single-channel operation
• On-State Resistance: Maximum 6.5 Ohm specification
• Bandwidth Performance: Minimum 720 MHz -3dB bandwidth for USB 2.0 compliance
• Supply Voltage Compatibility: Operating range must accommodate the application's power supply
• Package Compatibility: Surface mount 10-pin packages (10-UFQFN or equivalent footprint)
• Operating Temperature Range: -40°C to 85°C minimum requirement
• USB 2.0 Compliance: Bi-directional or Break-Before-Make switching capability

The FSUSB42UMX qualifies as a direct substitute based on matching all critical electrical parameters and maintaining compatible package dimensions, despite product status differences.

Parameter Comparison

Engineering Selection Recommendations

The FSUSB42UMX is the qualified substitute for the obsolete FSUSB20L10X based on the following engineering criteria:

Electrical Compatibility: The FSUSB42UMX maintains identical on-state resistance (6.5 Ohm maximum) and switch circuit topology (DPDT, single channel). The -3dB bandwidth of 720 MHz meets USB 2.0 requirements and is within acceptable tolerance of the original 750 MHz specification.

Supply Voltage: The FSUSB42UMX features an expanded supply voltage range (2.4V ~ 4.4V) compared to the original (3V ~ 3.6V), providing greater design flexibility while remaining compatible with the original operating range.

Product Status and Compliance: The FSUSB42UMX holds Active product status, ensuring continued availability and manufacturing support. Both components maintain identical REACH Unaffected and MSL 1 (Unlimited) classifications, confirming equivalent regulatory compliance.

Package and Thermal Performance: Both components utilize 10-pin surface mount packages with identical operating temperature ranges (-40°C ~ 85°C), ensuring direct PCB compatibility and thermal performance equivalence.

Enhanced Switching Behavior: The FSUSB42UMX incorporates Break-Before-Make switching logic, which provides improved signal integrity compared to the bi-directional switching of the original part, representing a functional enhancement for USB switching applications.

Frequently Asked Questions (FAQ)

Q: Can the FSUSB42UMX be used as a direct replacement for the FSUSB20L10X in existing designs?

A: Yes. The FSUSB42UMX meets all critical electrical parameters: identical DPDT switch configuration, matching on-state resistance (6.5 Ohm), compatible -3dB bandwidth (720 MHz vs. 750 MHz), and identical operating temperature range. Package footprints are compatible (10-UFQFN). No design modifications are required.

Q: What is the difference between Bi-Directional and Break-Before-Make switching?

A: Bi-Directional switching allows simultaneous conduction paths during transitions. Break-Before-Make ensures the switch breaks the existing connection before establishing a new one, eliminating momentary short circuits. For USB applications, Break-Before-Make provides superior signal integrity.

Q: Is the expanded supply voltage range of the FSUSB42UMX (2.4V ~ 4.4V) a concern compared to the original (3V ~ 3.6V)?

A: No. The expanded range is compatible with the original specification. If your design operates within 3V ~ 3.6V, the FSUSB42UMX will function identically. The wider range provides additional flexibility for future design iterations.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both components share identical REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity classification. Regulatory compliance is equivalent.

Q: Why is the FSUSB20L10X marked as obsolete?

A: The FSUSB20L10X has been superseded by the FSUSB42UMX in onsemi's product portfolio. The FSUSB42UMX offers identical electrical performance with enhanced switching characteristics and maintains Active product status for ongoing support.

Q: What is the significance of the 10-MicroPak™ vs. 10-UMLP package designation?

A: Both designations refer to equivalent 10-pin ultra-miniature surface mount packages with identical footprints (1.8x1.4 mm). The terminology reflects different naming conventions used by onsemi. PCB compatibility is maintained.