Equivalent & Substitute Parts for P8F Trimmer Capacitor

Part Overview

The P8F is a 0.8–8pF trimmer capacitor rated for 500V operation with top-side adjustment, manufactured by Knowles Voltronics. This component features a sapphire dielectric, non-magnetic construction, and surface mount packaging suitable for high-frequency applications. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement.

Substiute Parts

P8F

Knowles VoltronicsIn Stock: 1151P8F Datasheet

Current PartRFQ

27293

Knowles Johanson ManufacturingIn Stock: 170127293 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P8F is based on strict equivalence across the following critical parameters:

• Capacitance Range: 0.8–8pF (exact match required)
• Voltage Rating: 500V (minimum requirement)
• Dielectric Material: Sapphire (electrical performance determinant)
• Adjustment Type: Top (mechanical compatibility)
• Mounting Type: Surface Mount (assembly compatibility)
• Physical Dimensions: 0.140" diameter (4.66mm) and height within tolerance
• Operating Temperature Range: –65°C to 125°C (environmental compatibility)

The substitute part 27293 meets all these criteria and is manufactured by Knowles Johanson Manufacturing as an active product, providing a direct functional replacement for the obsolete P8F.

Parameter Comparison

Engineering Selection Recommendations

The 27293 is the direct substitute for the obsolete P8F. Both components share identical electrical specifications (capacitance range, voltage rating, dielectric material) and mechanical compatibility (adjustment type, mounting type, physical dimensions). The 27293 is manufactured by Knowles Johanson Manufacturing and maintains active product status, ensuring ongoing availability and supply chain continuity.

The 27293 offers ROHS3 compliance, meeting modern environmental and regulatory requirements. The maximum seated height of the 27293 (0.480") is 0.015" lower than the P8F (0.495"), which remains within typical PCB layout tolerances for surface mount components. This minor dimensional difference does not affect functional performance or mechanical fit in standard applications.

Frequently Asked Questions (FAQ)

Q: Can the 27293 be used as a direct replacement for the P8F in existing designs?

A: Yes. The 27293 meets all critical electrical and mechanical parameters of the P8F, including capacitance range, voltage rating, dielectric material, adjustment type, and mounting configuration. The slight reduction in maximum seated height (0.015") is not a functional constraint for standard PCB layouts.

Q: What is the difference in Q factor between the P8F and 27293?

A: The P8F specifies Q @ 1500 at 250MHz, while the 27293 specifies Q @ 3000 at 100MHz. These measurements are taken at different frequencies and therefore are not directly comparable. Both components are suitable for their respective application frequencies.

Q: Is the 27293 RoHS compliant?

A: Yes. The 27293 is ROHS3 compliant, meeting current environmental and regulatory standards for electronic components.

Q: Are there packaging differences between the P8F and 27293?

A: The P8F is specified with packaging listed as "–" (not specified), while the 27293 is supplied in Bulk packaging. Both components use identical surface mount construction and physical dimensions.

Q: What is the availability status of the 27293?

A: The 27293 is an active product with current inventory of 1682 pieces in stock, ensuring reliable procurement compared to the obsolete P8F.