FSAL200QSC Equivalent & Substitute Parts

Part Overview

The FSAL200QSC is a 4-circuit SPDT analog switch IC manufactured by onsemi, designed for signal routing and multiplexing applications in the 3V to 5.5V supply range. This component features 12Ohm on-state resistance and operates across the -40°C to 85°C temperature range. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SPDT (Single Pole Double Throw)
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	4
On-State Resistance (Max)	12Ohm
Channel-to-Channel Matching (ΔRon)	400mOhm
Supply Voltage Range (Single)	3V ~ 5.5V
Switch Time (Ton/Toff)	20ns / 10ns
-3dB Bandwidth	137MHz
Operating Temperature	-40°C ~ 85°C
Package Type	16-LSSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the FSAL200QSC is determined by the following critical parameters:

Circuit Configuration: SPDT 2:1 multiplexer with 4 independent circuits
On-State Resistance: Maximum 12Ohm (allows higher resistance substitutes with acceptable performance trade-offs)
Supply Voltage Compatibility: 3V to 5.5V single supply operation
Package Compatibility: 16-pin LSSOP/SSOP surface mount form factor
Operating Temperature Range: -40°C to 85°C
Functional Performance: Switch time, bandwidth, and leakage current characteristics

The substitute parts listed below maintain the core SPDT 2:1 4-circuit topology and surface mount packaging. Variations in on-state resistance, bandwidth, and leakage current reflect different semiconductor technologies and design approaches while preserving functional compatibility for most applications.

Parameter Comparison

Parameter	FSAL200QSC	FSAL200QSCX	QS4A205QG	QS4A205QG8	TS3A5018DBQR
Manufacturer	onsemi	onsemi	Renesas Electronics	Renesas Electronics	Texas Instruments
Switch Circuit	SPDT	SPDT	SPDT	SPDT	SPDT
Number of Circuits	4	4	4	4	4
On-State Resistance (Max)	12Ohm	12Ohm	17Ohm	17Ohm	10Ohm
Supply Voltage (Single)	3V ~ 5.5V	3V ~ 5.5V	5V	5V	1.65V ~ 3.6V
Switch Time Ton (Max)	20ns	20ns	6ns	6ns	8ns
Switch Time Toff (Max)	10ns	10ns	6ns	6ns	6.5ns
-3dB Bandwidth	137MHz	137MHz	830MHz	830MHz	300MHz
Charge Injection	7pC	7pC	1.5pC	1.5pC	2pC
Current - Leakage (Max)	100µA	100µA	2nA	2nA	100nA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	16-LSSOP	16-LSSOP	16-SSOP	16-SSOP	16-SSOP
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

FSAL200QSCX (onsemi): Direct equivalent with identical electrical specifications and operating parameters. Differs only in packaging format (Cut Tape & Digi-Reel versus standard packaging). ROHS3 compliant. Recommended for designs requiring exact parameter matching and onsemi product continuity. Higher inventory availability (17,846 pcs) supports production requirements.

QS4A205QG and QS4A205QG8 (Renesas Electronics): Active product status provides long-term supply assurance. Superior performance characteristics include lower on-state resistance (17Ohm vs. 12Ohm), significantly higher bandwidth (830MHz vs. 137MHz), and substantially lower leakage current (2nA vs. 100µA). Supply voltage limited to 5V nominal operation. Suitable for applications requiring enhanced signal integrity and lower power consumption. ROHS3 compliant. Available in both tube and tape & reel packaging.

TS3A5018DBQR (Texas Instruments): Active product with superior on-state resistance (10Ohm) and lower leakage current (100nA). Operates at lower supply voltage range (1.65V to 3.6V), limiting compatibility with 5V-only designs. Faster switch times (8ns/6.5ns) and moderate bandwidth (300MHz). ROHS3 compliant. Suitable for low-voltage applications and designs prioritizing minimal on-state resistance.

Frequently Asked Questions (FAQ)

Q: Can FSAL200QSCX be used as a direct replacement for FSAL200QSC?

A: Yes. FSAL200QSCX maintains identical electrical specifications, on-state resistance, supply voltage range, and operating temperature. The difference is packaging format. Both are onsemi products with equivalent performance characteristics.

Q: What are the key differences between onsemi and Renesas substitute options?

A: The Renesas QS4A205QG and QS4A205QG8 parts offer superior performance with lower leakage current (2nA vs. 100µA), higher bandwidth (830MHz vs. 137MHz), and faster switching times (6ns vs. 10-20ns). However, they operate at fixed 5V supply voltage, whereas FSAL200QSC supports 3V to 5.5V range. Both are active products with ROHS3 compliance.

Q: Is the TS3A5018DBQR compatible with 5V supply designs?

A: No. TS3A5018DBQR operates at 1.65V to 3.6V supply voltage range, making it unsuitable for 5V-only applications. It is appropriate for low-voltage designs where the supply voltage falls within its specified range.

Q: What packaging options are available for substitute parts?

A: FSAL200QSCX is available in Cut Tape & Digi-Reel format. QS4A205QG is supplied in Tube packaging. QS4A205QG8 is supplied in Tape & Reel format. TS3A5018DBQR is available in Cut Tape & Digi-Reel format. All maintain the 16-pin LSSOP/SSOP surface mount form factor with 0.154" (3.90mm) width.

Q: Are all substitute parts ROHS3 compliant?

A: FSAL200QSCX, QS4A205QG, QS4A205QG8, and TS3A5018DBQR are all ROHS3 compliant. The original FSAL200QSC is REACH unaffected. All parts carry EAR99 ECCN classification.

Q: Which substitute offers the best performance for high-frequency applications?

A: QS4A205QG and QS4A205QG8 provide the highest -3dB bandwidth at 830MHz, compared to 137MHz for FSAL200QSC. These parts are suitable for applications requiring superior high-frequency signal routing. Both are active products with long-term availability.

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