FC7BQCCMM8.0-T1 Equivalent & Substitute Parts

Part Overview

The FC7BQCCMM8.0-T1 is an 8 MHz fundamental mode crystal oscillator manufactured by Fox Electronics, designed for surface mount applications in 4-SMD, No Lead packaging. This part operates across the industrial temperature range of -40°C to 85°C with ±30ppm frequency tolerance and 20pF load capacitance. The product is currently obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications requiring 8 MHz crystal oscillators with matching electrical and mechanical specifications.

Substiute Parts

FC7BQCCMM8.0-T1

Fox ElectronicsIn Stock: 1181FC7BQCCMM8.0-T1 Datasheet

Current PartRFQ

FC7BSCBMM8.0-T1

Fox ElectronicsIn Stock: 1016FC7BSCBMM8.0-T1 Datasheet

SimilarRFQ

405I35D08M00000

CTS-Frequency ControlsIn Stock: 1081405I35D08M00000 Datasheet

SimilarRFQ

405I35E08M00000

CTS-Frequency ControlsIn Stock: 3024405I35E08M00000 Datasheet

SimilarRFQ

406I35D08M00000

CTS-Frequency ControlsIn Stock: 33646406I35D08M00000 Datasheet

SimilarRFQ

406I35E08M00000

CTS-Frequency ControlsIn Stock: 770406I35E08M00000 Datasheet

SimilarRFQ

407F39D008M0000

CTS-Frequency ControlsIn Stock: 1145407F39D008M0000 Datasheet

SimilarRFQ

407F39E008M0000

CTS-Frequency ControlsIn Stock: 174156407F39E008M0000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FC7BQCCMM8.0-T1 are qualified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Frequency: 8 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Load Capacitance: 20pF (exact match required)
• Operating Temperature Range: -40°C to 85°C (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 4-SMD, No Lead (exact match required)
• Operating Mode: Fundamental (exact match required)

Secondary Consideration:

• ESR (Equivalent Series Resistance): Variations within 40-110 Ohms are acceptable for circuit compatibility, as ESR affects circuit Q-factor and startup characteristics but does not prevent functional substitution within typical application tolerances.

Substitute parts meeting all primary criteria are considered direct equivalents. Parts with 18pF load capacitance are listed for reference but do not meet the primary matching criteria and require circuit re-evaluation before substitution.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (20pF Load Capacitance, All Primary Parameters Match):

1. 407F39E008M0000 (CTS-Frequency Controls) — Recommended primary substitute. Matches all electrical parameters and physical dimensions of the original part. Active product status with ROHS3 compliance. Highest inventory availability (174,049 pcs).

2. 405I35E08M00000 (CTS-Frequency Controls) — Qualified substitute with identical electrical specifications. Smaller package footprint (5.00 x 3.20mm vs. 7.00 x 5.00mm). Active product status with ROHS3 compliance. Suitable for space-constrained applications.

3. 406I35E08M00000 (CTS-Frequency Controls) — Qualified substitute with lower ESR (40 Ohms vs. 80 Ohms). Intermediate package size (6.00 x 4.60mm). Active product status with ROHS3 compliance. Tape & Reel packaging available.

4. FC7BSCBMM8.0-T1 (Fox Electronics) — Qualified substitute from original manufacturer. Active product status with ROHS3 compliance. Higher ESR (110 Ohms) and slightly larger package dimensions. Maintains Fox Electronics supply chain continuity.

All recommended substitutes are active products with current RoHS compliance, ensuring long-term availability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can I substitute the FC7BQCCMM8.0-T1 with a part having 18pF load capacitance?

A: No. The original part specifies 20pF load capacitance. Parts with 18pF load capacitance (405I35D08M00000, 406I35D08M00000, 407F39D008M0000) do not meet the primary matching criteria. Substitution requires circuit re-evaluation and potential oscillator tuning adjustments.

Q: What is the impact of ESR differences between substitute parts?

A: ESR affects crystal oscillator startup time and circuit Q-factor. The original part specifies 80 Ohms ESR. Substitutes with 40 Ohms (406I35E08M00000) or 60 Ohms (407F39E008M0000) ESR provide lower resistance, improving startup characteristics. The 110 Ohms ESR variant (FC7BSCBMM8.0-T1) is slightly higher but remains within acceptable operating range for most applications. Verify circuit design margins if ESR variation exceeds ±30 Ohms from the original specification.

Q: Are there package size considerations for substitution?

A: Yes. The original FC7BQCCMM8.0-T1 uses a 7.00 x 5.00mm footprint. The 405I35E08M00000 uses a smaller 5.00 x 3.20mm package, suitable for space-constrained designs. The 406I35E08M00000 and 407F39E008M0000 maintain similar or identical footprints. Verify PCB layout compatibility before selecting a substitute with different package dimensions.

Q: What is the difference between tape & reel and standard packaging?

A: Tape & Reel (TR) packaging is standard for high-volume automated assembly. Parts listed with TR packaging (406I35D08M00000, 406I35E08M00000, 407F39D008M0000, 407F39E008M0000) are supplied on continuous tape for pick-and-place equipment. Standard packaging may be supplied in alternative formats. Confirm packaging requirements with your procurement process.

Q: Why is the original part obsolete?

A: The FC7BQCCMM8.0-T1 is marked obsolete by Fox Electronics. Active substitute parts from both Fox Electronics (FC7BSCBMM8.0-T1) and CTS-Frequency Controls (405I35E08M00000, 406I35E08M00000, 407F39E008M0000) provide equivalent functionality with current product status and regulatory compliance.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification. The original part is marked REACH Unaffected. All substitutes maintain REACH Unaffected status, ensuring regulatory alignment for both legacy and new production applications.