FSUSB22QSC USB Switch IC Equivalent & Substitute Parts

Part Overview

The FSUSB22QSC is a quad 2:1 USB switch IC manufactured by onsemi in a 16-QSOP package. This interface component features 4 channels with SPDT switching capability, designed for USB 2.0 applications with a maximum on-state resistance of 6.5Ω and -3dB bandwidth of 750MHz. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and component sourcing.

Key Parameters

Parameter	Value
Manufacturer Part Number	FSUSB22QSC
Manufacturer	onsemi
Category	Interface
Package / Case	16-LSSOP (0.154", 3.90mm Width)
Number of Channels	4
Switch Circuit	SPDT
Multiplexer/Demultiplexer Circuit	2:1
On-State Resistance (Max)	6.5Ω
Voltage - Supply, Single (V+)	3V ~ 3.6V
-3dB Bandwidth	750MHz
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the FSUSB22QSC is determined by the following critical parameters:

Channel Configuration: 4 channels with 2:1 multiplexer/demultiplexer and SPDT switching topology
Supply Voltage: 3V to 3.6V single supply operation
On-State Resistance: Maximum 6.5Ω for USB 2.0 signal integrity
Bandwidth Performance: 750MHz -3dB bandwidth for high-speed USB applications
Operating Temperature Range: -40°C to 85°C
Package Compatibility: Surface mount packages with equivalent pin counts and footprints

Substitute parts are grouped into two categories based on application domain and performance characteristics:

Category 1: Networking Switch ICs (TS3L100 and TS3L110 series) These parts maintain the 4-channel SPDT configuration and 3V to 3.6V supply voltage. The TS3L100 series operates at 0°C to 70°C with 350MHz bandwidth, suitable for applications with relaxed temperature and bandwidth requirements. The TS3L110 series extends the operating temperature to -40°C to 85°C with 500MHz bandwidth, providing closer performance alignment to the FSUSB22QSC.

Category 2: Video Switch ICs (TS3V330 and TS3V340 series) These parts provide 4-channel SPDT switching with 3V to 3.6V supply and -40°C to 85°C operating temperature. The TS3V330 offers 300MHz bandwidth with RGB features, while the TS3V340 delivers 500MHz bandwidth with 6Ω on-state resistance, matching the FSUSB22QSC performance profile most closely.

Parameter Comparison

Part Number	Manufacturer	Package / Case	Channels	On-State Resistance (Max)	-3dB Bandwidth	Supply Voltage	Operating Temperature	Product Status
FSUSB22QSC	onsemi	16-LSSOP (3.90mm)	4	6.5Ω	750MHz	3V ~ 3.6V	-40°C ~ 85°C	Obsolete
TS3L100DBQR	Texas Instruments	16-SSOP (3.90mm)	4	15Ω	350MHz	3V ~ 3.6V	0°C ~ 70°C	Active
TS3L100PW	Texas Instruments	16-TSSOP (4.40mm)	4	15Ω	350MHz	3V ~ 3.6V	0°C ~ 70°C	Active
TS3L100PWR	Texas Instruments	16-TSSOP (4.40mm)	4	15Ω	350MHz	3V ~ 3.6V	0°C ~ 70°C	Active
TS3L110DBQR	Texas Instruments	16-SSOP (3.90mm)	4	8Ω	500MHz	3V ~ 3.6V	-40°C ~ 85°C	Active
TS3L110PW	Texas Instruments	16-TSSOP (4.40mm)	4	8Ω	500MHz	3V ~ 3.6V	-40°C ~ 85°C	Last Time Buy
TS3L110PWR	Texas Instruments	16-TSSOP (4.40mm)	4	8Ω	500MHz	3V ~ 3.6V	-40°C ~ 85°C	Active
TS3V330DBQR	Texas Instruments	16-SSOP (3.90mm)	4	10Ω	300MHz	3V ~ 3.6V	-40°C ~ 85°C	Active
TS3V330PW	Texas Instruments	16-TSSOP (4.40mm)	4	10Ω	300MHz	3V ~ 3.6V	-40°C ~ 85°C	Last Time Buy
TS3V330PWR	Texas Instruments	16-TSSOP (4.40mm)	4	10Ω	300MHz	3V ~ 3.6V	-40°C ~ 85°C	Active
TS3V340DBQR	Texas Instruments	16-SSOP (3.90mm)	4	6Ω	500MHz	3V ~ 3.6V	-40°C ~ 85°C	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility)

TS3V340DBQR and TS3L110DBQR are the most suitable direct replacements. Both maintain the full -40°C to 85°C operating temperature range and deliver 500MHz bandwidth performance. TS3V340DBQR provides the closest on-state resistance specification at 6Ω, matching the FSUSB22QSC within 0.5Ω. Both parts are Active status with ROHS3 compliance and are available in 16-SSOP packages with 3.90mm width, maintaining footprint compatibility with the original LSSOP package.

Secondary Substitutes (Conditional Compatibility)

TS3L110PWR and TS3V330PWR are Active status alternatives in 16-TSSOP packages. These require PCB layout adjustment due to the 4.40mm package width versus the original 3.90mm. TS3L110PWR maintains the 500MHz bandwidth and full temperature range. TS3V330PWR operates within the full temperature range but with reduced 300MHz bandwidth, suitable only for applications not requiring the original 750MHz performance.

Limited Compatibility Substitutes

TS3L100 series parts (DBQR, PW, PWR variants) are Active status but restricted to 0°C to 70°C operating temperature and 350MHz bandwidth. These are suitable only for commercial-grade applications with relaxed environmental specifications. The 15Ω on-state resistance represents a 2.3x increase over the FSUSB22QSC, potentially affecting signal integrity in bandwidth-critical designs.

Compliance Status

All Texas Instruments substitute parts carry ROHS3 compliance and REACH Unaffected status, matching the regulatory profile of the original FSUSB22QSC.

Frequently Asked Questions (FAQ)

Q: Can TS3L100 series parts directly replace FSUSB22QSC in all applications?

A: TS3L100 series parts are not suitable for applications requiring the full -40°C to 85°C temperature range or 750MHz bandwidth. These parts operate only to 70°C and provide 350MHz bandwidth. Use only in commercial-grade designs with relaxed environmental and performance specifications.

Q: What is the impact of on-state resistance differences between substitute parts?

A: On-state resistance affects signal attenuation and power dissipation. The FSUSB22QSC specifies 6.5Ω maximum. TS3V340DBQR at 6Ω provides equivalent performance. TS3L110 series at 8Ω and TS3V330 series at 10Ω introduce progressively higher insertion loss. TS3L100 series at 15Ω may degrade signal quality in high-speed USB applications.

Q: Are package changes between LSSOP and SSOP/TSSOP acceptable?

A: 16-LSSOP (3.90mm width) and 16-SSOP (3.90mm width) packages are footprint-compatible and require no PCB modification. 16-TSSOP (4.40mm width) packages require PCB layout adjustment. Verify pin assignments and thermal pad requirements before implementation.

Q: Which substitute part is recommended for new designs?

A: TS3V340DBQR is the recommended primary choice for new designs. It provides Active product status, 500MHz bandwidth matching the original performance, 6Ω on-state resistance, full -40°C to 85°C temperature range, and ROHS3 compliance. TS3L110DBQR is an equivalent alternative with 8Ω on-state resistance.

Q: What is the difference between Last Time Buy and Active product status?

A: Active status indicates ongoing production and long-term availability. Last Time Buy status indicates the manufacturer has announced end-of-life, with production continuing only through a specified final order date. Parts in Last Time Buy status (TS3L110PW, TS3V330PW) should be avoided for new designs requiring long-term component supply.

Q: Are all substitute parts RoHS compliant?

A: All Texas Instruments substitute parts listed carry ROHS3 compliance. The original FSUSB22QSC does not specify RoHS status in the provided data. Verify RoHS requirements for your specific application before selection.

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