C3VFSC7 Equivalent & Substitute Parts

Part Overview

The C3VFSC7 is a 311.04 MHz VCXO CMOS oscillator manufactured by Cardinal Components Inc., designed for applications requiring voltage-controlled crystal oscillator functionality with enable/disable control. This device operates at 3.3V supply voltage and delivers CMOS-level output signals. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for system redesign, legacy support, and procurement planning.

Substiute Parts

C3VFSC7

Cardinal Components Inc.In Stock: 1032C3VFSC7 Datasheet

Current PartRFQ

XLP73V311.040000I

Renesas Electronics CorporationIn Stock: 683XLP73V311.040000I Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the C3VFSC7 requires matching the following critical parameters:

• Frequency: 311.04 MHz (exact match required)
• Type: VCXO with enable/disable functionality
• Supply Voltage: 3.3V operation
• Package: 6-SMD, No Lead surface mount configuration
• Mounting: Surface mount compatibility with existing PCB layouts

The XLP73V311.040000I from Renesas Electronics Corporation meets these core substitution criteria. While the output type differs (LVPECL vs. CMOS), both are logic-level outputs compatible with 3.3V systems. The substitute part maintains identical frequency, package form factor, and enable/disable control functionality, making it suitable for direct replacement in applications where LVPECL output levels are acceptable to downstream circuitry.

Parameter Comparison

Engineering Selection Recommendations

The XLP73V311.040000I represents the primary substitute for the obsolete C3VFSC7. Selection of this alternative is supported by the following factors:

• Product Status: The Renesas part is active and in production, ensuring long-term availability and supply chain stability compared to the obsolete Cardinal component.
• Regulatory Compliance: The XLP73V311.040000I carries ROHS3 compliance certification, meeting current environmental and material restriction requirements.
• Frequency Match: Both parts operate at 311.04 MHz, ensuring direct functional equivalence in frequency-dependent applications.
• Package Compatibility: Both use 6-SMD, No Lead surface mount packages with identical pinout and enable/disable control, allowing PCB-level substitution.
• Output Level Consideration: The shift from CMOS to LVPECL output requires verification that downstream receiver circuits accept LVPECL logic levels at 3.3V. LVPECL outputs are compatible with CMOS input thresholds in most modern digital systems.
• Current Consumption: The substitute part draws 120mA maximum compared to 40mA for the original. Power supply and thermal design must accommodate this increased current draw.
• Temperature Range: The Renesas part extends the lower operating limit to -40°C, providing broader environmental coverage than the original -10°C minimum.

Frequently Asked Questions (FAQ)

Q: Can the XLP73V311.040000I directly replace the C3VFSC7 without circuit modifications?

A: Direct PCB-level replacement is possible due to identical package type and pinout. However, circuit verification is required to confirm that downstream logic accepts LVPECL output levels. LVPECL and CMOS outputs differ in voltage swing characteristics, though both operate within 3.3V logic domains.

Q: What is the impact of the output type change from CMOS to LVPECL?

A: CMOS outputs swing between ground and supply voltage (0V to 3.3V). LVPECL outputs operate with a smaller voltage swing centered around a reference level. Most modern 3.3V CMOS receivers accept LVPECL input levels, but signal integrity analysis is recommended for high-speed or noise-sensitive applications.

Q: Are the package dimensions identical between the two parts?

A: Both parts use 6-SMD, No Lead packages, but dimensions differ slightly. The Renesas part measures 0.295" L x 0.205" W (7.50mm x 5.20mm) versus the Cardinal part at 0.276" L x 0.197" W (7.00mm x 5.00mm). The Renesas part is also lower in profile (0.055" vs. 0.079" seated height). These differences are within typical PCB layout tolerances for surface mount components.

Q: Why does the substitute part consume more current?

A: The XLP73V311.040000I draws 120mA maximum compared to 40mA for the C3VFSC7. This difference reflects the LVPECL output architecture, which requires higher current for signal generation. Power supply capacity and thermal management must be evaluated for the target application.

Q: Is the frequency stability specification comparable?

A: The C3VFSC7 specifies ±30ppm frequency stability. The XLP73V311.040000I does not provide a published frequency stability value in the available data. Applications requiring specific frequency stability guarantees should contact the manufacturer for detailed specifications.

Q: What is the significance of the extended temperature range in the substitute part?

A: The XLP73V311.040000I operates from -40°C to 85°C, compared to -10°C to 85°C for the original. This extended lower limit provides operational capability in colder environments and may be beneficial for aerospace, automotive, or outdoor applications.

Q: Are both parts REACH compliant?

A: Yes, both the C3VFSC7 and XLP73V311.040000I are listed as REACH Unaffected, indicating compliance with REACH regulations.