FPXLF080-20 Equivalent & Substitute Parts

Part Overview

The FPXLF080-20 is an 8 MHz fundamental mode crystal oscillator manufactured by Fox Electronics, designed for surface mount applications with a 20pF load capacitance and 80 Ohms equivalent series resistance. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The crystal operates across a temperature range of -10°C to 70°C with ±50ppm frequency stability, suitable for timing and clock generation in electronic systems.

Substiute Parts

FPXLF080-20

Fox ElectronicsIn Stock: 1237FPXLF080-20 Datasheet

Current PartRFQ

ECS-80-20-7SX-TR

ECS Inc.In Stock: 868ECS-80-20-7SX-TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the FPXLF080-20 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 8 MHz (exact match required)
• Load Capacitance: 20pF (exact match required)
• Operating Mode: Fundamental (exact match required)
• Operating Temperature Range: -10°C to 70°C (minimum coverage required)
• Mounting Type: Surface Mount (exact match required)
• Physical Dimensions: 12.50mm L x 4.60mm W x 3.70mm H maximum (exact match required)
• Moisture Sensitivity Level: MSL 1 or better (exact match required)

Allowable Variation Parameters:

• Frequency Stability: ±50ppm or better (tighter tolerance acceptable)
• Frequency Tolerance: May vary within design specifications
• ESR: Variation acceptable within circuit design margins (80 Ohms baseline)
• Package Designation: Alternative surface mount package types acceptable if physical dimensions match

The ECS-80-20-7SX-TR meets all mandatory matching criteria and qualifies as a direct substitute for the FPXLF080-20.

Parameter Comparison

Engineering Selection Recommendations

The ECS-80-20-7SX-TR is the qualified substitute for the obsolete FPXLF080-20. Selection is based on the following engineering criteria:

Product Status: The ECS-80-20-7SX-TR maintains active product status with current manufacturing support, ensuring long-term availability and supply chain continuity compared to the obsolete FPXLF080-20.

Compliance & Certifications: Both components share identical REACH status (REACH Unaffected) and ECCN classification (EAR99), maintaining regulatory compliance across applications. The ECS-80-20-7SX-TR carries RoHS3 compliance, meeting modern environmental standards.

Parameter Alignment: The substitute part matches all critical electrical parameters (frequency, load capacitance, operating mode, temperature range) and physical dimensions required for direct board-level replacement. The ESR variation (100 Ohms vs. 80 Ohms) and improved frequency tolerance (±30ppm vs. ±50ppm) are within acceptable design margins for standard timing applications.

Inventory & Availability: The ECS-80-20-7SX-TR is currently in stock with 793 units available, providing immediate procurement capability for production and design transitions.

Frequently Asked Questions (FAQ)

Q: Can the ECS-80-20-7SX-TR be used as a direct replacement for the FPXLF080-20 on existing PCBs?

A: Yes. The ECS-80-20-7SX-TR matches the physical dimensions (12.50mm x 4.60mm x 3.70mm) and footprint pitch of the FPXLF080-20, enabling direct board-level substitution without PCB redesign.

Q: What is the difference between the 4-SMD and 4-SOJ package designations?

A: Both designations refer to surface mount packages with four leads. The 4-SOJ (Small Outline J-lead) and 4-SMD (Surface Mount Device) configurations used in these parts share identical physical dimensions and mounting footprints, making them mechanically and electrically interchangeable for this application.

Q: Does the higher ESR of the ECS-80-20-7SX-TR (100 Ohms vs. 80 Ohms) affect circuit performance?

A: The 20 Ohm ESR increase is within acceptable design margins for standard 8 MHz crystal timing circuits. Circuit designers should verify ESR specifications against their oscillator circuit requirements, but this variation does not preclude substitution for typical applications.

Q: Is the improved frequency tolerance (±30ppm) of the ECS-80-20-7SX-TR beneficial?

A: Yes. The tighter ±30ppm tolerance of the substitute part provides improved frequency accuracy compared to the ±50ppm specification of the original part, offering enhanced performance for timing-sensitive applications.

Q: What compliance certifications apply to both parts?

A: Both the FPXLF080-20 and ECS-80-20-7SX-TR carry REACH Unaffected status and EAR99 ECCN classification. The ECS-80-20-7SX-TR additionally meets RoHS3 compliance requirements.

Q: Are there any moisture sensitivity concerns with the ECS-80-20-7SX-TR?

A: No. Both parts carry MSL 1 (Unlimited) moisture sensitivity ratings, indicating no moisture-related handling restrictions during storage, transport, or assembly.