FSAL200MTCX Equivalent & Substitute Parts

Part Overview

The FSAL200MTCX 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 supply range with a maximum on-state resistance of 12Ohm and supports switching frequencies up to 137MHz. The device is packaged in a 16-TSSOP surface mount configuration with RoHS3 compliance and unlimited moisture sensitivity rating.

The FSAL200MTCX is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute components must maintain functional compatibility across switching characteristics, package form factor, and electrical operating parameters.

Key Parameters

Parameter	FSAL200MTCX
Manufacturer	onsemi
Switch Circuit Type	SPDT
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	2:1
On-State Resistance (Max)	12Ohm
Channel-to-Channel Matching (ΔRon)	400mOhm
Voltage - Supply, Single (V+)	3V ~ 5.5V
Switch Time (Ton, Toff) (Max)	20ns, 10ns
-3dB Bandwidth	137MHz
Charge Injection	7pC
Channel Capacitance (CS(off), CD(off))	13pF
Current - Leakage (IS(off)) (Max)	100µA
Crosstalk	-70dB @ 30MHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-TSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the FSAL200MTCX are evaluated based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Switch circuit topology (SPDT configuration)
Number of circuits (4-circuit requirement)
Multiplexer/demultiplexer circuit (2:1 ratio)
Package form factor (16-TSSOP surface mount)
Operating temperature range (-40°C ~ 85°C)
RoHS3 compliance and MSL rating

Secondary Performance Parameters:

On-state resistance and channel-to-channel matching
Supply voltage range compatibility
Switching speed characteristics
Bandwidth and frequency response
Leakage current specifications

Substitutes are grouped into two categories: MFR Recommended (direct manufacturer recommendation) and Similar (functionally equivalent with noted parameter variations).

Parameter Comparison

Parameter	FSAL200MTCX (onsemi)	TS3A5018PW (TI)	PI5L200LEX (Diodes)	QS4A205QG (Renesas)	QS4A205QG8 (Renesas)	TS3A5018PWR (TI)
Switch Circuit	SPDT	SPDT	-	SPDT	SPDT	SPDT
Number of Circuits	4	4	4	4	4	4
Multiplexer/Demultiplexer Circuit	2:1	2:1	2:1	2:1	2:1	2:1
On-State Resistance (Max)	12Ohm	10Ohm	12Ohm	17Ohm	17Ohm	10Ohm
Channel-to-Channel Matching (ΔRon)	400mOhm	300mOhm	-	-	-	300mOhm
Voltage - Supply, Single (V+)	3V ~ 5.5V	1.65V ~ 3.6V	3.3V, 5V	5V	5V	1.65V ~ 3.6V
Switch Time (Ton, Toff) (Max)	20ns, 10ns	8ns, 6.5ns	-	6ns, 6ns	6ns, 6ns	8ns, 6.5ns
-3dB Bandwidth	137MHz	300MHz	137MHz	830MHz	830MHz	300MHz
Charge Injection	7pC	2pC	-	1.5pC	1.5pC	2pC
Current - Leakage (IS(off)) (Max)	100µA	100nA	-	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	-40°C ~ 85°C
Package / Case	16-TSSOP	16-TSSOP	16-TSSOP	16-SSOP	16-SSOP	16-TSSOP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

MFR Recommended Substitute: TS3A5018PW / TS3A5018PWR (Texas Instruments)

The TS3A5018 series represents the manufacturer-recommended replacement for the obsolete FSAL200MTCX. Both TS3A5018PW (Tube packaging) and TS3A5018PWR (Cut Tape & Digi-Reel packaging) maintain identical electrical specifications. These devices offer superior performance characteristics including lower on-state resistance (10Ohm vs. 12Ohm), reduced leakage current (100nA vs. 100µA), and faster switching times (8ns/6.5ns vs. 20ns/10ns). The TS3A5018 operates across a narrower supply range (1.65V ~ 3.6V) compared to the FSAL200MTCX (3V ~ 5.5V), requiring verification of circuit compatibility. Both variants maintain 16-TSSOP packaging, RoHS3 compliance, and MSL 1 rating. TS3A5018PWR is currently in active production with significantly higher inventory availability (109,400 units).

Similar Substitute: PI5L200LEX (Diodes Incorporated)

The PI5L200LEX provides functional equivalence with identical on-state resistance (12Ohm) and bandwidth (137MHz) specifications. This device is designed for telecommunications applications including 10/100 Base-T and LAN switching. The PI5L200LEX operates at fixed supply voltages (3.3V, 5V) rather than a continuous range, and lacks detailed specifications for several parameters including switch circuit type designation, channel-to-channel matching, and leakage current. The device maintains 16-TSSOP packaging, RoHS3 compliance, and MSL 1 rating. Current product status is active with 1,526 units in inventory.

Similar Substitute: QS4A205QG / QS4A205QG8 (Renesas Electronics Corporation)

The QS4A205 series offers superior high-frequency performance with 830MHz bandwidth and exceptionally low leakage current (2nA). These devices feature faster switching times (6ns) and lower charge injection (1.5pC) compared to the FSAL200MTCX. However, the on-state resistance is higher at 17Ohm, and the supply voltage is fixed at 5V only. The QS4A205QG is packaged in 16-QSOP (Tube), while QS4A205QG8 is packaged in 16-QSOP (Tape & Reel). Both maintain RoHS3 compliance and MSL 1 rating. QS4A205QG8 is in active production with high inventory (16,485 units).

Package Consideration: QS4A205 variants use 16-QSOP (0.154", 3.90mm Width) packaging, which differs from the FSAL200MTCX 16-TSSOP (0.173", 4.40mm Width). PCB layout modifications are required for this substitution.

Frequently Asked Questions (FAQ)

Q: Can TS3A5018PW directly replace FSAL200MTCX without circuit modifications?

A: The TS3A5018PW maintains identical 16-TSSOP packaging and functional topology (4-circuit SPDT 2:1 multiplexer). However, the supply voltage range differs: TS3A5018PW operates at 1.65V ~ 3.6V while FSAL200MTCX operates at 3V ~ 5.5V. Circuits designed for 5V operation require verification that the TS3A5018PW's maximum 3.6V rating is compatible with system requirements. The lower on-state resistance (10Ohm vs. 12Ohm) and significantly reduced leakage current (100nA vs. 100µA) represent performance improvements suitable for most applications.

Q: What are the key differences between TS3A5018PW and TS3A5018PWR?

A: Both variants are electrically identical with matching specifications. The difference is packaging format: TS3A5018PW is supplied in Tube packaging, while TS3A5018PWR is supplied in Cut Tape & Digi-Reel format. Selection depends on procurement and assembly requirements. TS3A5018PWR has significantly higher inventory availability (109,400 units vs. 1,220 units).

Q: Why do QS4A205QG and QS4A205QG8 use different package designations (16-QSOP vs. 16-TSSOP)?

A: Both Renesas devices use 16-QSOP packaging (0.154", 3.90mm Width), which is physically different from the FSAL200MTCX 16-TSSOP (0.173", 4.40mm Width). The QSOP package is narrower and requires PCB layout redesign. The packaging difference is the primary consideration when evaluating these substitutes for existing designs.

Q: What is the impact of lower leakage current in TS3A5018 variants?

A: The TS3A5018 series exhibits leakage current of 100nA compared to FSAL200MTCX at 100µA, representing a 1000-fold reduction. This improvement reduces power consumption in applications with multiple switch channels and extends battery life in portable systems. Lower leakage current also improves signal integrity in high-impedance signal paths.

Q: Can PI5L200LEX be used in applications requiring detailed electrical specifications?

A: The PI5L200LEX provides functional equivalence for basic switching applications with matching on-state resistance (12Ohm) and bandwidth (137MHz). However, several critical parameters lack specification data, including channel-to-channel matching, charge injection, and leakage current. Applications requiring comprehensive electrical characterization should prioritize TS3A5018 or QS4A205 variants with complete parameter documentation.

Q: What supply voltage considerations apply when selecting substitutes?

A: FSAL200MTCX operates across 3V ~ 5.5V. TS3A5018 variants operate at 1.65V ~ 3.6V (narrower range, lower maximum). PI5L200LEX operates at fixed 3.3V or 5V. QS4A205 variants operate at fixed 5V only. Verify that the selected substitute's supply voltage range encompasses the circuit's operating requirements.

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