FC4STCBAF12.0 Equivalent & Substitute Parts

Part Overview

The FC4STCBAF12.0 is a 12 MHz through-hole crystal oscillator manufactured by Fox Electronics, designed for fundamental mode operation in HC-49/US package configuration. This active product is ROHS3 compliant and suitable for applications requiring stable frequency reference at 12 MHz with ±30ppm tolerance. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within specified parameter ranges.

Substiute Parts

FC4STCBAF12.0

Fox ElectronicsIn Stock: 1154FC4STCBAF12.0 Datasheet

Current PartRFQ

ECS-120-S-4X

ECS Inc.In Stock: 2118ECS-120-S-4X Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FC4STCBAF12.0 are qualified based on the following critical parameters:

• Frequency: 12 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• ESR: 60 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 Compliance: ROHS3 Compliant (compliance level match required)

The ECS-120-S-4X meets all critical substitution criteria and is classified as a direct equivalent for the FC4STCBAF12.0.

Parameter Comparison

Engineering Selection Recommendations

Both the FC4STCBAF12.0 and ECS-120-S-4X are active products with ROHS3 compliance and REACH unaffected status. Selection between these parts is based on the following factors:

The FC4STCBAF12.0 provides a wider operating temperature range (-20°C to 70°C) compared to the ECS-120-S-4X (-10°C to 70°C). Applications requiring operation below -10°C must use the FC4STCBAF12.0.

The ECS-120-S-4X has a marginally lower seated height (4.60mm vs 3.60mm), which may be advantageous in space-constrained PCB layouts.

Both parts share identical electrical specifications (frequency, tolerance, ESR, load capacitance) and mechanical compatibility (HC-49/US package, through-hole mounting, identical footprint dimensions).

Frequently Asked Questions (FAQ)

Q: Can the ECS-120-S-4X replace the FC4STCBAF12.0 in all applications?

A: The ECS-120-S-4X is electrically and mechanically compatible for applications operating within the -10°C to 70°C temperature range. Applications requiring operation below -10°C must use the FC4STCBAF12.0.

Q: Are the physical dimensions identical between these parts?

A: The length and width dimensions are identical (11.35mm x 4.65mm). The seated height differs by 0.10mm (FC4STCBAF12.0: 3.60mm; ECS-120-S-4X: 4.60mm). This difference is negligible for standard PCB applications but should be verified for height-constrained designs.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the FC4STCBAF12.0 and ECS-120-S-4X are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.60.0050.

Q: What are the critical parameters for substitution?

A: Frequency (12 MHz), frequency tolerance (±30ppm), ESR (60 Ohms), package type (HC-49/US), and operating mode (fundamental) must remain constant. Operating temperature range and seated height are secondary considerations dependent on application requirements.

Q: Is the MSL rating difference significant?

A: The FC4STCBAF12.0 has MSL not applicable, while the ECS-120-S-4X has MSL 1 (unlimited). This indicates the ECS-120-S-4X has defined moisture sensitivity handling requirements. Verify storage and handling procedures for your specific manufacturing environment.