FPXLF080 Equivalent & Substitute Parts Reference

Part Overview

The FPXLF080 is an 8.0 MHz crystal oscillator manufactured by Fox Electronics, designed for surface mount applications in a 4-SMD, no lead package. This component operates at fundamental mode with ±50ppm frequency stability across the -10°C to 70°C temperature range. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new procurement requirements.

Substiute Parts

FPXLF080

Fox ElectronicsIn Stock: 1128FPXLF080 Datasheet

Current PartRFQ

ECS-80-S-7SX-TR

ECS Inc.In Stock: 4210ECS-80-S-7SX-TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FPXLF080 is determined by the following critical parameters:

Primary Matching Criteria:

• Frequency: 8.0 MHz (exact match required)
• Operating Mode: Fundamental (exact match required)
• Frequency Stability: ±50ppm or better (equal or tighter tolerance acceptable)
• Operating Temperature Range: -10°C to 70°C minimum (equal or wider range acceptable)
• Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Factors:

• ESR: 80 Ohms nominal (±20% variation acceptable within circuit design margins)
• Package footprint: Physical dimensions and pitch compatibility with PCB layout
• Moisture Sensitivity: MSL 1 or better (lower MSL numbers indicate better moisture resistance)

The ECS-80-S-7SX-TR meets all primary matching criteria and maintains compatibility within acceptable engineering tolerances for ESR variation.

Parameter Comparison

Engineering Selection Recommendations

The ECS-80-S-7SX-TR is a direct functional equivalent for the obsolete FPXLF080. Both components share identical frequency, operating mode, temperature range, and physical dimensions. The substitute part offers improved frequency tolerance (±30ppm versus ±50ppm), which provides enhanced stability margins in timing-critical applications.

The ESR difference of 20 Ohms (80 Ohms to 100 Ohms) falls within acceptable circuit design tolerances and does not preclude substitution. Circuit validation should confirm that the slightly higher ESR does not impact oscillation startup or frequency accuracy in the specific application.

The ECS-80-S-7SX-TR is classified as "Not For New Designs" by the manufacturer, indicating limited long-term availability. For new production programs, additional alternatives should be evaluated to ensure supply chain continuity beyond the current inventory level of 4165 pieces.

Frequently Asked Questions (FAQ)

Q: Can the ECS-80-S-7SX-TR be used as a direct drop-in replacement for the FPXLF080?

A: Yes, the ECS-80-S-7SX-TR is electrically and mechanically compatible. Both components operate at 8.0 MHz with identical frequency stability, temperature range, and physical footprint. The substitute part requires no circuit modifications for standard applications.

Q: What is the significance of the ESR difference between the two parts?

A: The FPXLF080 specifies 80 Ohms ESR while the ECS-80-S-7SX-TR specifies 100 Ohms. This 20-Ohm difference is within typical design margins for crystal oscillator circuits. ESR affects oscillation startup time and power consumption; however, the magnitude of this difference does not typically require circuit redesign for applications operating within the specified temperature and frequency range.

Q: Are there any compliance or regulatory differences between these parts?

A: Both parts share identical REACH status (REACH Unaffected), ECCN classification (EAR99), and HTSUS code (8541.60.0050). The substitute part carries RoHS3 compliance certification, which exceeds the regulatory requirements of the original part. No compliance barriers exist for substitution.

Q: What packaging format is supplied for the ECS-80-S-7SX-TR?

A: The ECS-80-S-7SX-TR is supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount assembly. The FPXLF080 packaging format is not specified in the available data; verify packaging compatibility with your procurement and assembly processes.

Q: Should I be concerned about the "Not For New Designs" status of the substitute part?

A: The "Not For New Designs" designation indicates that ECS Inc. is not recommending this part for new product development, typically due to planned discontinuation or replacement by newer alternatives. For legacy system support or existing production runs, this part remains functionally suitable. For new product development, evaluate additional 8.0 MHz crystal alternatives to ensure long-term supply availability.