FC4STCBMF6.0 Equivalent & Substitute Parts

Part Overview

The FC4STCBMF6.0 is a 6 MHz through-hole crystal oscillator manufactured by Fox Electronics, designed for fundamental mode operation in timing and frequency control applications. This part is currently active in production with 823 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to supply constraints, design flexibility, or inventory optimization.

Substiute Parts

FC4STCBMF6.0

Fox ElectronicsIn Stock: 836FC4STCBMF6.0 Datasheet

Current PartRFQ

AS-6.000-18

Raltron ElectronicsIn Stock: 4235AS-6.000-18 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The AS-6.000-18 from Raltron Electronics qualifies as a substitute based on the following critical parameters:

• Frequency Match: Both parts operate at 6 MHz with identical ±30ppm frequency tolerance
• Operating Mode: Both use fundamental mode operation
• Package Compatibility: Both use HC-49/US through-hole package with compatible mechanical dimensions
• Temperature Range: Both support -20°C ~ 70°C operating temperature
• Compliance: Both are ROHS3 compliant and REACH unaffected

Substitution is valid within the constraints of load capacitance and ESR differences, which must be evaluated against specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the FC4STCBMF6.0 and AS-6.000-18 are active production parts with full regulatory compliance. Selection between these parts depends on circuit-specific requirements:

The FC4STCBMF6.0 operates with 20pF load capacitance and 120 Ohms ESR. The AS-6.000-18 operates with 18pF load capacitance and 80 Ohms ESR. These differences affect oscillator startup behavior and power consumption characteristics. Circuit design parameters, including load capacitance tuning and drive level specifications, determine which part is appropriate for a given application.

Both parts meet ROHS3 and REACH compliance requirements and operate across the identical temperature range. Mechanical compatibility is confirmed through HC-49/US package standardization, with minor dimensional variations within standard tolerances.

Frequently Asked Questions (FAQ)

Q: Can AS-6.000-18 directly replace FC4STCBMF6.0 in existing designs?

A: Direct replacement requires circuit evaluation. The 2pF load capacitance difference and 40 Ohm ESR difference may affect oscillator tuning and startup characteristics. Circuit design parameters must be reviewed to confirm compatibility.

Q: Are both parts available in the same packaging format?

A: Yes. Both parts use HC-49/US through-hole package with compatible mechanical dimensions. Dimensional variations are within standard tolerances for this package type.

Q: What is the significance of the ESR difference?

A: ESR (Equivalent Series Resistance) affects oscillator power consumption and startup behavior. The AS-6.000-18 has lower ESR (80 Ohms vs. 120 Ohms), which may reduce power requirements but requires circuit validation.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting identical environmental and regulatory requirements.

Q: What is the load capacitance difference impact?

A: Load capacitance affects the oscillation frequency in the circuit. The 2pF difference between 20pF and 18pF requires circuit tuning adjustment to maintain specified frequency tolerance. Circuit design parameters must accommodate this difference.

Q: Are both parts currently in production?

A: Yes. Both parts have active product status with current inventory availability.