FSAL200QSCX Equivalent & Substitute Parts

Part Overview

The FSAL200QSCX is a 4-circuit SPDT analog switch manufactured by onsemi, designed for signal routing and multiplexing applications. This interface IC operates across a 3V to 5.5V single supply with 12Ohm on-state resistance and features a 137MHz bandwidth. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

FSAL200QSCX

onsemiIn Stock: 17878FSAL200QSCX Datasheet

Current PartRFQ

TS3A5018PW

Texas InstrumentsIn Stock: 1250TS3A5018PW Datasheet

MFR RecommendedRFQ

QS4A205QG

Renesas Electronics CorporationIn Stock: 2377QS4A205QG Datasheet

SimilarRFQ

QS4A205QG8

Renesas Electronics CorporationIn Stock: 16558QS4A205QG8 Datasheet

SimilarRFQ

TS3A5018DBQR

Texas InstrumentsIn Stock: 17447TS3A5018DBQR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FSAL200QSCX is determined by the following core parameters:

• Switch circuit configuration (SPDT required)
• Number of circuits (4 required)
• Multiplexer/demultiplexer circuit topology (2:1 required)
• Operating temperature range (-40°C ~ 85°C minimum)
• On-state resistance compatibility (12Ohm maximum acceptable)
• Supply voltage overlap with 3V ~ 5.5V range
• Surface mount package compatibility
• RoHS3 compliance

The substitute parts listed below meet these electrical and mechanical criteria, though individual parameter values may vary within acceptable engineering tolerances for signal switching applications.

Parameter Comparison

Engineering Selection Recommendations

TS3A5018PW (MFR Recommended Substitute)

This Texas Instruments part is designated as the manufacturer-recommended substitute. It provides superior electrical performance with 10Ohm on-state resistance, 300MHz bandwidth, and significantly lower leakage current (100nA vs. 100µA). However, the supply voltage range (1.65V ~ 3.6V) does not fully overlap with the FSAL200QSCX operating range above 3.6V. Package width increases from 3.90mm to 4.40mm (16-TSSOP). Moisture sensitivity is improved to MSL 1. Product status is Last Time Buy, indicating limited future availability.

QS4A205QG and QS4A205QG8 (Similar Substitutes)

Both Renesas Electronics parts are functionally identical, differing only in packaging format (Tube vs. Tape & Reel). These devices operate at fixed 5V supply, matching the upper range of the FSAL200QSCX. On-state resistance is 17Ohm, exceeding the main part specification. Electrical performance is superior with 830MHz bandwidth, 2nA leakage current, and -100dB crosstalk. Package dimensions match the original (16-SSOP, 3.90mm width). Both parts maintain Active product status with MSL 1 rating, ensuring long-term availability and superior moisture handling.

TS3A5018DBQR (Similar Substitute)

This Texas Instruments variant in 16-SSOP package provides identical electrical specifications to TS3A5018PW with the same supply voltage limitation (1.65V ~ 3.6V). Package dimensions match the original (3.90mm width). Product status is Active with MSL 2 rating. This option is suitable for designs operating within the 1.65V ~ 3.6V range.

Frequently Asked Questions (FAQ)

Q: Can TS3A5018PW replace FSAL200QSCX in all applications?

A: TS3A5018PW is electrically compatible for SPDT 4-circuit switching functions. However, the supply voltage range (1.65V ~ 3.6V) does not support operation above 3.6V. Applications requiring the full 3V ~ 5.5V range must use QS4A205QG or QS4A205QG8. Package width increases from 3.90mm to 4.40mm, requiring PCB layout verification.

Q: What is the difference between QS4A205QG and QS4A205QG8?

A: Both parts are electrically identical 4-circuit SPDT switches with 17Ohm on-state resistance and 5V operation. The difference is packaging format: QS4A205QG is supplied in Tube, while QS4A205QG8 is supplied in Tape & Reel. Electrical performance and pin configuration are identical.

Q: Why does QS4A205QG have higher on-state resistance (17Ohm vs. 12Ohm)?

A: On-state resistance variation is a normal characteristic across different IC switch designs and manufacturing processes. The 17Ohm specification remains within acceptable limits for most analog switching applications. Signal integrity impact depends on source impedance and load characteristics in the specific circuit design.

Q: Is the package size change from 3.90mm to 4.40mm (TS3A5018PW) critical?

A: Package width increase from 3.90mm to 4.40mm requires PCB layout verification. If the original design has tight spacing constraints, QS4A205QG or QS4A205QG8 maintain the original 3.90mm width. TS3A5018DBQR also preserves the original package dimensions.

Q: What does "Last Time Buy" status mean for TS3A5018PW?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part. Existing inventory is available for purchase, but production will cease. For long-term designs, QS4A205QG or QS4A205QG8 with Active status are recommended to ensure sustained availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. FSAL200QSCX and all listed substitutes (TS3A5018PW, QS4A205QG, QS4A205QG8, TS3A5018DBQR) are ROHS3 Compliant. All parts are also REACH Unaffected and classified under ECCN EAR99.

Q: Which substitute offers the best long-term availability?

A: QS4A205QG and QS4A205QG8 maintain Active product status with unlimited moisture sensitivity (MSL 1), providing the strongest long-term availability and reliability profile. Both are supplied by Renesas Electronics with no announced end-of-life.