MC18FD271F-TF Equivalent & Substitute Parts

Part Overview

The MC18FD271F-TF 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 Active and remains in current production. 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.

Substitute parts are identified when equivalent electrical performance can be maintained within the allowed parameter tolerances for the application. The primary reason to evaluate alternative models is inventory availability, lead time optimization, or specific tolerance requirements that may be satisfied by related part numbers within the same product family.

Substiute Parts

MC18FD271F-TF

Cornell Dubilier Electronics (CDE)In Stock: 1002MC18FD271F-TF Datasheet

Current PartRFQ

MC18FD271J-F

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MC18FD271F-TF is determined by strict equivalence in the following parameters:

Critical Parameters (Must Match Exactly):

• Capacitance: 270 pF
• Voltage Rating: 500 V
• Dielectric Material: Mica
• Package / Case: 1812 (4532 Metric)
• Mounting Type: Surface Mount
• Physical Dimensions: 0.177" L x 0.126" W (4.50mm x 3.20mm)
• Height - Seated (Max): 0.079" (2.00mm)

Allowable Variation Parameters:

• Tolerance: ±1% (main part) to ±5% (substitute part) — tolerance may be relaxed in substitutes
• Operating Temperature Range: -55°C to 125°C (must be maintained or exceeded)
• RoHS and MSL Status: Must maintain compliance level or higher

The MC18FD271J-F qualifies as a substitute because it maintains all critical electrical and mechanical parameters while permitting a tolerance relaxation from ±1% to ±5%. This tolerance difference is the sole distinguishing factor between the main part and the identified substitute.

Parameter Comparison

Engineering Selection Recommendations

MC18FD271F-TF (±1% Tolerance): Select this part number when circuit design specifications require capacitance tolerance of ±1% or tighter. This specification is appropriate for precision RF tuning circuits, impedance matching networks, or applications where capacitance drift must be minimized across the operating temperature range.

MC18FD271J-F (±5% Tolerance): This substitute part number is suitable for applications where capacitance tolerance of ±5% is acceptable. Both parts maintain identical voltage rating, dielectric material, package dimensions, and thermal operating range. The MC18FD271J-F is available in higher inventory quantity (1218 Pcs vs. 986 Pcs) and may offer improved lead time availability.

Both parts are Active products manufactured by Cornell Dubilier Electronics, maintain ROHS3 compliance, and carry MSL Level 1 (Unlimited) moisture sensitivity rating. Selection between these two part numbers should be based solely on the tolerance requirement of the specific application circuit.

Frequently Asked Questions (FAQ)

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

A: The MC18FD271J-F can replace the MC18FD271F-TF only in applications where a ±5% capacitance tolerance is acceptable. If the circuit design requires ±1% tolerance or tighter, the MC18FD271F-TF must be used. Both parts are electrically and mechanically identical in all other parameters.

Q: Are the physical dimensions and PCB footprints identical?

A: Yes. Both parts use the 1812 (4532 Metric) package with identical dimensions of 0.177" L x 0.126" W (4.50mm x 3.20mm) and maximum seated height of 0.079" (2.00mm). PCB footprints and assembly processes are interchangeable.

Q: Do both parts meet the same compliance standards?

A: Yes. Both MC18FD271F-TF and MC18FD271J-F are ROHS3 compliant, REACH unaffected, and carry MSL Level 1 (Unlimited) rating. Both are classified as Active products in current production.

Q: What is the voltage rating difference, if any?

A: There is no voltage rating difference. Both parts are rated for 500 V operation and maintain identical operating temperature range of -55°C to 125°C.

Q: Which part should be selected for RF applications?

A: Both parts are specified for RF applications with High Q and Low Loss characteristics. Selection should be based on the tolerance requirement: use MC18FD271F-TF for ±1% tolerance circuits, or MC18FD271J-F for ±5% tolerance circuits.