MC18FD271F-F Equivalent & Substitute Parts

Part Overview

The MC18FD271F-F is a 270 pF mica capacitor manufactured by Cornell Dubilier Electronics (CDE), rated for 500 V operation in a 1812 (4532 Metric) surface mount package. This component is classified as an active product with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Mica capacitors in this specification are utilized in RF applications requiring high Q factor and low loss characteristics across the operating temperature range of -55°C to 125°C. Alternative models may be required due to inventory constraints, specific tolerance requirements, or application-driven parameter adjustments.

Substiute Parts

MC18FD271F-F

Cornell Dubilier Electronics (CDE)In Stock: 864MC18FD271F-F Datasheet

Current PartRFQ

MC18FD271J-F

Cornell Dubilier Electronics (CDE)In Stock: 1253MC18FD271J-F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MC18FD271F-F is permissible with the MC18FD271J-F based on the following criteria:

Matching Parameters (Required for Substitution):

• Capacitance: 270 pF (identical)
• Voltage Rating: 500 V (identical)
• Dielectric Material: Mica (identical)
• Package / Case: 1812 (4532 Metric) (identical)
• Mounting Type: Surface Mount (identical)
• Operating Temperature Range: -55°C to 125°C (identical)
• Physical Dimensions: 0.177" L x 0.126" W / 4.50mm x 3.20mm (identical)
• Height - Seated (Max): 0.079" (2.00mm) (identical)
• RoHS Status: ROHS3 Compliant (identical)
• MSL Rating: 1 (Unlimited) (identical)

Differing Parameter:

• Tolerance: MC18FD271F-F operates at ±1%, while MC18FD271J-F operates at ±5%

The substitute part maintains electrical and mechanical compatibility with identical capacitance, voltage rating, package dimensions, and thermal specifications. The tolerance difference represents the only parameter variance and must be evaluated against circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

MC18FD271F-F Selection Criteria: Select the MC18FD271F-F when circuit design specifications require a tolerance of ±1%. This tighter tolerance specification is appropriate for precision RF applications where capacitance accuracy directly impacts circuit performance parameters such as resonant frequency or impedance matching networks.

MC18FD271J-F Selection Criteria: Select the MC18FD271J-F when circuit design specifications permit a tolerance of ±5%. This substitute part maintains identical electrical performance in voltage rating, capacitance value, and thermal operating range while offering broader tolerance acceptance. The MC18FD271J-F is suitable for applications where capacitance variation within ±5% does not degrade circuit function.

Compliance Considerations: Both parts maintain identical ROHS3 compliance, REACH unaffected status, and MSL 1 rating. Both are classified as active products from Cornell Dubilier Electronics. Selection between these parts is determined solely by tolerance requirements and application-specific circuit performance criteria.

Frequently Asked Questions (FAQ)

Q: Can MC18FD271J-F replace MC18FD271F-F in all applications?

A: Substitution is permissible only when circuit design specifications allow a capacitance tolerance of ±5%. If the circuit requires ±1% tolerance accuracy, the MC18FD271J-F is not suitable. Review circuit schematic tolerance requirements and performance specifications before substitution.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both the MC18FD271F-F and MC18FD271J-F share identical package dimensions of 1812 (4532 Metric), with length 0.177" (4.50mm), width 0.126" (3.20mm), and maximum seated height of 0.079" (2.00mm). PCB layout and assembly tooling are compatible.

Q: What is the difference in tolerance between these parts?

A: The MC18FD271F-F operates at ±1% tolerance, while the MC18FD271J-F operates at ±5% tolerance. This means the MC18FD271F-F maintains capacitance within 270 pF ±2.7 pF, while the MC18FD271J-F maintains capacitance within 270 pF ±13.5 pF.

Q: Do both parts have identical voltage ratings?

A: Yes. Both the MC18FD271F-F and MC18FD271J-F are rated for 500 V operation. Voltage derating curves and maximum operating voltage specifications are identical.

Q: Are the thermal operating ranges the same?

A: Yes. Both parts operate across the identical temperature range of -55°C to 125°C. Thermal coefficient and capacitance stability across this range are equivalent.

Q: What is the MSL rating for both parts?

A: Both parts carry an MSL rating of 1 (Unlimited), indicating unlimited shelf life and no moisture sensitivity precautions required during storage or handling.

Q: Are both parts RoHS compliant?

A: Yes. Both the MC18FD271F-F and MC18FD271J-F are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.