FSA2257MTCX Equivalent & Substitute Parts

Part Overview

The FSA2257MTCX is a 2-circuit SPDT (Single Pole Double Throw) analog switch IC manufactured by onsemi, designed for signal routing and multiplexing applications in the 1.65V to 5.5V supply voltage range. This component features low on-state resistance of 1.5Ohm typical and operates at switching speeds up to 35ns, making it suitable for audio and RF signal switching applications. The FSA2257MTCX is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production support.

Substiute Parts

FSA2257MTCX

onsemiIn Stock: 2589FSA2257MTCX Datasheet

Current PartRFQ

FSA2257MUX

onsemiIn Stock: 23902FSA2257MUX Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FSA2257MTCX is determined by electrical and functional equivalence across the following critical parameters:

• Switch Configuration: SPDT topology with 2:1 multiplexer/demultiplexer circuit and 2 total circuits
• Electrical Performance: On-state resistance of 1.5Ohm typical, channel matching of 700mOhm, supply voltage range of 1.65V to 5.5V
• Switching Characteristics: Maximum switch times of 35ns (Ton) and 15ns (Toff), -3dB bandwidth of 200MHz
• Signal Integrity: Charge injection of 10pC, channel capacitance of 12pF, crosstalk of -75dB @ 1MHz
• Leakage Performance: Maximum leakage current of 2nA
• Environmental Compliance: ROHS3 compliance, MSL Level 1, operating temperature range of -40°C to 85°C

The FSA2257MUX meets all electrical and functional requirements for direct substitution, with the primary difference being package format (10-MSOP versus 14-TSSOP).

Parameter Comparison

Engineering Selection Recommendations

Both the FSA2257MTCX and FSA2257MUX are classified as obsolete products. Selection between these parts is determined by PCB layout constraints and package availability:

FSA2257MTCX (14-TSSOP): Use when existing PCB layouts require the 14-pin TSSOP package format with 4.40mm width. This package is suitable for applications where pin spacing and board real estate accommodate the larger footprint.

FSA2257MUX (10-MSOP): Use when space-constrained designs require the 10-pin MSOP package with 3.00mm width. This package provides equivalent electrical performance in a smaller form factor.

Both parts maintain ROHS3 compliance, MSL Level 1 rating, and identical electrical specifications. Selection should be based on PCB design requirements and package availability from current inventory sources.

Frequently Asked Questions (FAQ)

Q: Are FSA2257MTCX and FSA2257MUX electrically interchangeable?

A: Yes. Both parts share identical electrical specifications including on-state resistance, switching times, bandwidth, and leakage characteristics. The primary difference is package format: FSA2257MTCX uses 14-TSSOP while FSA2257MUX uses 10-MSOP.

Q: What is the key difference between the 14-TSSOP and 10-MSOP packages?

A: The 14-TSSOP package measures 4.40mm in width with 14 pins, while the 10-MSOP package measures 3.00mm in width with 10 pins. The 10-MSOP provides a more compact footprint suitable for space-constrained applications.

Q: Can I use FSA2257MUX as a direct replacement for FSA2257MTCX on an existing PCB?

A: Direct PCB replacement requires redesign of the footprint and routing. The different package formats (14-TSSOP versus 10-MSOP) have different pin counts and layouts. Schematic functionality is equivalent, but physical board layout modification is necessary.

Q: Are both parts still in production?

A: Both FSA2257MTCX and FSA2257MUX are classified as obsolete. Component selection should prioritize available inventory and long-term supply chain planning.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and carry MSL Level 1 (unlimited) moisture sensitivity rating. Operating temperature range is identical at -40°C to 85°C.

Q: What supply voltage range do these parts support?

A: Both parts operate with a single supply voltage range of 1.65V to 5.5V, making them suitable for low-voltage and standard logic applications.