FSA805UMX Equivalent & Substitute Parts

Part Overview

The FSA805UMX is a 1-channel audio switch IC manufactured by onsemi in a 12-UMLP (1.8x1.8) surface mount package. This component is designed for consumer audio applications requiring analog signal switching with a 1x3:1 multiplexer configuration. The FSA805UMX is currently classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity.

Substiute Parts

FSA805UMX

onsemiIn Stock: 25234FSA805UMX Datasheet

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FSA1153UCX

onsemiIn Stock: 3551FSA1153UCX Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The FSA1153UCX qualifies as a functional substitute for the FSA805UMX based on the following critical parameters:

Matching Parameters:

• Manufacturer: onsemi (same source)
• Switch Configuration: 3:1 multiplexer (equivalent switching topology)
• Number of Channels: 1 (identical channel count)
• Interface Type: Analog (same signal domain)
• Operating Temperature Range: -40°C ~ 85°C (identical thermal specification)
• Moisture Sensitivity Level: 1 (Unlimited) (equivalent reliability classification)
• Surface Mount Technology: Both use surface mount construction

Supply Voltage Compatibility: The FSA1153UCX operates at 2.7V ~ 5.5V, which encompasses the FSA805UMX supply range of 2.7V ~ 4.4V. The substitute part supports the full operating voltage window of the original component.

Package Consideration: Both parts use 12-pin packages (12-UFQFN/12-UMLP for FSA805UMX; 12-UFBGA/12-WLCSP for FSA1153UCX). Physical footprint compatibility requires verification against specific PCB layout requirements.

Parameter Comparison

Engineering Selection Recommendations

The FSA1153UCX is the designated substitute for the obsolete FSA805UMX based on functional equivalence and compliance alignment:

Product Status Justification: The FSA805UMX is obsolete, while the FSA1153UCX maintains active production status with onsemi. This ensures long-term availability and supply chain continuity for new designs or production restarts.

Compliance & Certification: Both parts carry identical regulatory classifications: REACH Unaffected, ECCN EAR99, and HTSUS 8542.39.0001. The FSA1153UCX additionally carries RoHS3 compliance certification, meeting modern environmental standards.

Electrical Compatibility: The FSA1153UCX supports the full operating voltage range of the FSA805UMX (2.7V ~ 4.4V falls within 2.7V ~ 5.5V specification). Identical operating temperature ranges (-40°C ~ 85°C) ensure thermal compatibility across all application environments.

Package Migration Path: PCB redesign is required due to package differences (12-UMLP to 12-WLCSP). Verify footprint compatibility and signal routing before implementation.

Frequently Asked Questions (FAQ)

Q: Can the FSA1153UCX directly replace the FSA805UMX without PCB modification?

A: Electrical substitution is valid; however, physical package differences (12-UMLP versus 12-WLCSP) require PCB layout changes. Pin-to-pin compatibility must be verified against the respective datasheets before implementation.

Q: What is the key difference in supply voltage specifications?

A: The FSA805UMX operates at 2.7V ~ 4.4V, while the FSA1153UCX operates at 2.7V ~ 5.5V. The substitute part supports a wider voltage range, making it compatible with the original design's voltage window and providing additional flexibility for future applications.

Q: Why is the FSA805UMX listed as obsolete?

A: Obsolescence indicates that onsemi has discontinued production and support for this part number. The FSA1153UCX represents the active alternative for new designs and production continuity.

Q: Are there any performance differences between these parts?

A: Both parts share identical channel count (1), switch configuration (3:1), operating temperature range (-40°C ~ 85°C), and moisture sensitivity classification. The FSA1153UCX provides additional specifications including on-state resistance (2Ohm max), bandwidth (500MHz), and crosstalk performance (-120dB @ 1kHz), which were not specified for the FSA805UMX.

Q: What certifications apply to both parts?

A: Both the FSA805UMX and FSA1153UCX are REACH Unaffected and classified under ECCN EAR99. The FSA1153UCX additionally carries RoHS3 compliance, meeting current environmental regulations.

Q: How should package selection be handled in the design process?

A: Confirm the 12-WLCSP footprint compatibility with your PCB design tools and manufacturing capabilities. Consult the onsemi datasheets for detailed pinout and mechanical specifications before finalizing the layout.