C3FSC7 Equivalent & Substitute Parts Reference

Part Overview

The C3FSC7 is a 311.04 MHz XO (Standard) CMOS oscillator manufactured by Cardinal Components Inc., designed for applications requiring a fixed-frequency crystal oscillator with enable/disable functionality. Operating at 3.3V with CMOS output, this component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this frequency specification.

The primary reason for identifying substitutes is the obsolete product status, which limits availability for production and maintenance applications. Substitute parts must maintain compatibility across frequency, voltage supply, package type, and output characteristics.

Substiute Parts

C3FSC7

Cardinal Components Inc.In Stock: 963C3FSC7 Datasheet

Current PartRFQ

XLP73V311.040000I

Renesas Electronics CorporationIn Stock: 683XLP73V311.040000I Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the C3FSC7 are identified based on the following allowed parameters:

• Frequency Match: 311.04 MHz (exact match required)
• Voltage Supply: 3.3V (exact match required)
• Package Type: 6-SMD, No Lead (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Function: Enable/Disable capability (required)
• Output Compatibility: CMOS or compatible logic families (LVPECL acceptable with signal level verification)
• Operating Temperature Range: Must encompass or match the original specification
• Frequency Stability: ±50ppm or better

The XLP73V311.040000I from Renesas Electronics Corporation qualifies as a substitute based on matching frequency, voltage supply, package configuration, and enable/disable functionality. While the output type differs (LVPECL vs. CMOS), both are compatible 3.3V logic families suitable for this application context.

Parameter Comparison

Engineering Selection Recommendations

The XLP73V311.040000I is suitable as a substitute for the C3FSC7 based on the following engineering criteria:

• Product Status: The substitute is active and in current production, ensuring long-term availability compared to the obsolete C3FSC7.
• Compliance: Both parts maintain REACH Unaffected and identical Moisture Sensitivity Level (MSL 1) ratings, ensuring regulatory and handling compatibility.
• Frequency and Voltage: Exact match on 311.04 MHz frequency and 3.3V supply voltage eliminates timing and power compatibility concerns.
• Package and Mounting: Identical 6-SMD, No Lead package type and surface mount configuration ensure PCB assembly compatibility with minor dimensional verification required.
• Output Logic Family: While the substitute uses LVPECL instead of CMOS, both are 3.3V-compatible logic families. System-level signal integrity analysis is required to confirm receiver compatibility.
• Operating Temperature: The substitute's extended temperature range (-40°C ~ 85°C) provides broader environmental coverage than the original specification.
• Power Consumption: The substitute requires higher maximum supply current (120mA vs. 40mA). Power supply design must accommodate this increased demand.

Frequently Asked Questions (FAQ)

Q: Can the XLP73V311.040000I directly replace the C3FSC7 without circuit modifications?

A: Direct replacement is possible for frequency and power supply compatibility. However, the output logic family change from CMOS to LVPECL requires verification that downstream receiver circuits accept LVPECL signal levels at 3.3V. Signal integrity analysis is recommended before implementation.

Q: What is the impact of the dimensional difference between the two parts?

A: The XLP73V311.040000I is slightly larger (7.50mm x 5.20mm vs. 7.00mm x 5.00mm) but lower profile (1.40mm vs. 2.00mm). PCB layout must be verified to ensure the larger footprint does not create placement conflicts. The lower height may improve clearance in space-constrained applications.

Q: Does the higher current consumption of the substitute affect system design?

A: Yes. The XLP73V311.040000I requires up to 120mA compared to the C3FSC7's 40mA maximum. Power supply capacity and current delivery paths must be re-evaluated to ensure adequate supply current without voltage droop. Decoupling capacitor placement and trace sizing may require adjustment.

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

A: Both parts share identical REACH and Moisture Sensitivity Level classifications. No additional compliance barriers exist for substitution. However, system-level certifications (if applicable) should be reviewed to confirm the output logic family change does not affect regulatory status.

Q: What is the significance of the frequency stability specification?

A: The C3FSC7 specifies ±50ppm frequency stability. The XLP73V311.040000I does not provide this specification in the available data. Applications with strict frequency tolerance requirements should obtain detailed frequency stability specifications from Renesas before finalizing the substitution.

Q: Is the extended operating temperature range of the substitute beneficial?

A: The substitute's -40°C ~ 85°C range exceeds the C3FSC7's -10°C ~ 85°C specification. This provides additional margin for applications operating at lower temperatures. However, if the original design only requires -10°C ~ 85°C, this additional capability does not provide functional advantage.