FSUSB22QSCX USB Switch IC Equivalent & Substitute Parts

Part Overview

The FSUSB22QSCX is a quad 2:1 USB switch IC manufactured by onsemi, designed for USB signal routing applications. This 4-channel SPDT switch operates at 3V to 3.6V supply voltage with 6.5Ω maximum on-state resistance and 750MHz bandwidth, supporting USB 2.0 bi-directional switching. The device is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements.

Key Parameters

Parameter	FSUSB22QSCX
Manufacturer	onsemi
Package / Case	16-LSSOP (0.154", 3.90mm Width)
Multiplexer/Demultiplexer Circuit	2:1
Switch Circuit	SPDT
Number of Channels	4
On-State Resistance (Max)	6.5Ω
Voltage - Supply, Single (V+)	3V ~ 3.6V
-3dB Bandwidth	750MHz
Features	Bi-Directional, USB 2.0
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the FSUSB22QSCX is determined by the following critical parameters:

Core Functional Requirements:

Multiplexer/Demultiplexer Circuit: 2:1
Switch Circuit: SPDT
Number of Channels: 4
Voltage Supply Range: 3V ~ 3.6V
Operating Temperature Range: -40°C ~ 85°C

Performance Criteria:

On-State Resistance: Maximum 6.5Ω (lower values acceptable)
-3dB Bandwidth: Minimum 750MHz (higher values acceptable)
Features: Bi-Directional, USB 2.0 capable

Physical & Compliance Requirements:

Mounting Type: Surface Mount
Package compatibility: 16-pin QSOP/SSOP/TSSOP variants
RoHS3 Compliance
Operating temperature range must encompass -40°C to 85°C

Substitute parts are grouped by their ability to meet or exceed these parameters while maintaining functional equivalence for USB switching applications.

Parameter Comparison

Part Number	Manufacturer	Package / Case	On-State Resistance (Max)	Voltage - Supply (V+)	-3dB Bandwidth	Operating Temperature	Product Status
FSUSB22QSCX	onsemi	16-LSSOP (3.90mm)	6.5Ω	3V ~ 3.6V	750MHz	-40°C ~ 85°C	Obsolete
PI3V312QE	Diodes Incorporated	16-SSOP (3.90mm)	8Ω	3.3V	500MHz	-40°C ~ 85°C	Active
TS3L100DBQR	Texas Instruments	16-SSOP (3.90mm)	15Ω	3V ~ 3.6V	350MHz	0°C ~ 70°C	Active
TS3L100PW	Texas Instruments	16-TSSOP (4.40mm)	15Ω	3V ~ 3.6V	350MHz	0°C ~ 70°C	Active
TS3L100PWR	Texas Instruments	16-TSSOP (4.40mm)	15Ω	3V ~ 3.6V	350MHz	0°C ~ 70°C	Active
TS3L110DBQR	Texas Instruments	16-SSOP (3.90mm)	8Ω	3V ~ 3.6V	500MHz	-40°C ~ 85°C	Active
TS3L110PW	Texas Instruments	16-TSSOP (4.40mm)	8Ω	3V ~ 3.6V	500MHz	-40°C ~ 85°C	Last Time Buy
TS3L110PWR	Texas Instruments	16-TSSOP (4.40mm)	8Ω	3V ~ 3.6V	500MHz	-40°C ~ 85°C	Active
TS3V330DBQR	Texas Instruments	16-SSOP (3.90mm)	10Ω	3V ~ 3.6V	300MHz	-40°C ~ 85°C	Active
TS3V330PW	Texas Instruments	16-TSSOP (4.40mm)	10Ω	3V ~ 3.6V	300MHz	-40°C ~ 85°C	Last Time Buy
TS3V330PWR	Texas Instruments	16-TSSOP (4.40mm)	10Ω	3V ~ 3.6V	300MHz	-40°C ~ 85°C	Active

Engineering Selection Recommendations

Primary Substitutes (Full Parameter Compatibility):

TS3L110DBQR and TS3L110PWR are the preferred active substitutes. Both maintain the full operating temperature range (-40°C to 85°C), supply voltage specification (3V ~ 3.6V), and exceed the original bandwidth requirement (500MHz vs. 750MHz original). On-state resistance of 8Ω is within acceptable tolerance. Both parts are RoHS3 compliant and actively manufactured.

Secondary Substitutes (Acceptable with Design Review):

TS3L110PW offers equivalent electrical performance to TS3L110PWR but carries Last Time Buy status, limiting long-term availability. TS3V330PWR and TS3V330DBQR maintain full temperature and voltage specifications but operate at 300MHz bandwidth, suitable only for applications not requiring the full 750MHz performance envelope.

Limited Substitutes (Restricted Application):

PI3V312QE operates at fixed 3.3V supply (not the 3V ~ 3.6V range) and provides only 500MHz bandwidth. TS3L100 variants (DBQR, PW, PWR) operate at reduced temperature range (0°C ~ 70°C) and 350MHz bandwidth, unsuitable for extended temperature applications.

Compliance Status:

All listed substitutes maintain RoHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can TS3L110DBQR directly replace FSUSB22QSCX in existing designs?

A: TS3L110DBQR is electrically and functionally equivalent. Both use 16-SSOP packaging with 3.90mm width. Verify PCB layout compatibility and confirm that the 8Ω on-state resistance (versus 6.5Ω original) does not impact signal integrity in your specific application.

Q: What is the difference between TS3L110PW and TS3L110PWR?

A: Both parts are electrically identical (8Ω, 500MHz, -40°C to 85°C). TS3L110PW is packaged in Tube format with Last Time Buy status. TS3L110PWR is packaged in Cut Tape & Digi-Reel format with Active status and higher inventory availability. For new designs, TS3L110PWR is recommended.

Q: Why do TS3L100 variants show lower bandwidth (350MHz)?

A: TS3L100 series is optimized for Ethernet/networking applications (10/100 Base-T) rather than general USB switching. The 350MHz bandwidth is sufficient for Ethernet but insufficient for USB 2.0 high-speed applications requiring 750MHz performance.

Q: Can I use TS3V330 parts as USB switch replacements?

A: TS3V330 series is designed for video/RGB switching applications with 300MHz bandwidth. While electrically compatible at the 2:1 SPDT 4-channel level, the reduced bandwidth makes these unsuitable for USB 2.0 applications requiring 750MHz performance.

Q: What packaging options are available for active substitutes?

A: Active substitutes are available in two package variants: 16-SSOP (3.90mm width) and 16-TSSOP (4.40mm width). Verify your PCB design accommodates the selected package before procurement.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the original FSUSB22QSCX regulatory requirements.

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