FC4STCBAF4.0 Equivalent & Substitute Parts

Part Overview

The FC4STCBAF4.0 is a 4 MHz through-hole crystal oscillator manufactured by Fox Electronics, designed for fundamental mode operation in standard HC-49/US packaging. This component is classified as Active product status with full ROHS3 compliance and REACH unaffected certification. Substitute parts are identified to provide alternative sourcing options when the primary part becomes unavailable or when inventory requirements necessitate qualified alternatives meeting identical electrical and mechanical specifications.

Substiute Parts

FC4STCBAF4.0

Fox ElectronicsIn Stock: 933FC4STCBAF4.0 Datasheet

Current PartRFQ

ECS-40-S-4X

ECS Inc.In Stock: 1972ECS-40-S-4X Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FC4STCBAF4.0 are qualified based on the following critical parameters that determine functional and mechanical interchangeability:

• Frequency: 4 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• ESR: 150 Ohms (exact match required)
• Package / Case: HC-49/US (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Mode: Fundamental (exact match required)
• RoHS Status: ROHS3 Compliant (compliance requirement)

The ECS-40-S-4X meets all critical substitution criteria and is therefore classified as a direct equivalent for the FC4STCBAF4.0.

Parameter Comparison

Engineering Selection Recommendations

Both the FC4STCBAF4.0 and ECS-40-S-4X are Active product status components with identical electrical specifications and mechanical compatibility. Selection between these parts may be based on inventory availability, lead time, or supply chain requirements. The FC4STCBAF4.0 supports an extended lower operating temperature limit of -20°C compared to the ECS-40-S-4X at -10°C; applications requiring operation below -10°C must specify the FC4STCBAF4.0. Both parts maintain ROHS3 compliance and REACH unaffected status, suitable for regulated manufacturing environments.

Frequently Asked Questions (FAQ)

Q: Can the ECS-40-S-4X replace the FC4STCBAF4.0 in all applications?

A: The ECS-40-S-4X is electrically and mechanically equivalent for applications operating within the -10°C to 70°C temperature range. Applications requiring operation below -10°C must use the FC4STCBAF4.0 due to its extended lower temperature specification of -20°C.

Q: Are the physical dimensions identical between these parts?

A: Both parts use HC-49/US packaging with identical length and width dimensions (0.447" x 0.183"). The seated height differs by 0.004" (0.10mm), with the ECS-40-S-4X at 0.138" and the FC4STCBAF4.0 at 0.142". This minimal difference does not affect PCB layout compatibility.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the FC4STCBAF4.0 and ECS-40-S-4X are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS code 8541.60.0030.

Q: What is the significance of the ±30ppm frequency tolerance specification?

A: The ±30ppm frequency tolerance defines the maximum allowable deviation from the nominal 4 MHz frequency at room temperature and specified load conditions. Both parts meet this specification, ensuring frequency accuracy for timing-critical applications.

Q: Are there any moisture sensitivity considerations for these parts?

A: The FC4STCBAF4.0 lists Moisture Sensitivity Level as Not Applicable. The ECS-40-S-4X specifies MSL 1 (Unlimited), indicating no moisture-related handling restrictions for either part.