Equivalent & Substitute Parts for P8J Trimmer Capacitor

Part Overview

The P8J is a 0.8–8pF trimmer capacitor rated for 500V operation, manufactured by Knowles Voltronics. This component features a sapphire dielectric with side adjustment capability and is designed for surface mount applications. The product is currently obsolete, making identification of suitable substitute components essential for ongoing system support and component procurement.

Substiute Parts

P8J

Knowles VoltronicsIn Stock: 992P8J Datasheet

Current PartRFQ

27291SL

Knowles Johanson ManufacturingIn Stock: 280327291SL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P8J is determined by strict equivalence across the following critical parameters:

• Capacitance range: 0.8–8pF (exact match required)
• Voltage rating: 500V (exact match required)
• Adjustment type: Side (exact match required)
• Dielectric material: Sapphire (exact match required)
• Mounting type: Surface Mount (exact match required)
• Physical dimensions: 0.140" diameter (4.66mm) (exact match required)
• Operating temperature range: –65°C to 125°C (exact match required)

The substitute part 27291SL meets all critical electrical and mechanical parameters, enabling direct functional replacement in applications requiring the P8J specification.

Parameter Comparison

Engineering Selection Recommendations

The 27291SL is a direct functional equivalent to the P8J. Both components share identical electrical specifications, physical dimensions, and environmental operating parameters. The 27291SL is manufactured by Knowles Johanson Manufacturing and carries active product status, ensuring ongoing availability and supply chain continuity. The 27291SL is RoHS3 compliant, meeting current regulatory requirements for electronic component procurement. Selection of the 27291SL eliminates obsolescence risk while maintaining full electrical and mechanical compatibility with existing P8J applications.

Frequently Asked Questions (FAQ)

Q: Can the 27291SL be used as a direct replacement for the P8J?

A: Yes. The 27291SL meets all critical electrical and mechanical parameters of the P8J, including capacitance range, voltage rating, adjustment type, dielectric material, mounting configuration, and physical dimensions. Direct substitution is supported.

Q: What is the primary advantage of using the 27291SL over the P8J?

A: The 27291SL carries active product status, ensuring long-term availability and supply chain support. The P8J is obsolete and subject to inventory depletion.

Q: Are there packaging differences between the P8J and 27291SL?

A: Both components are surface mount devices with identical physical dimensions (0.140" diameter, 4.66mm). Packaging format differences do not affect functional compatibility or board-level integration.

Q: Does the 27291SL meet current regulatory compliance standards?

A: Yes. The 27291SL is RoHS3 compliant, meeting current environmental and regulatory requirements for electronic component procurement and use.

Q: Are the Q-factor specifications identical between the two parts?

A: The Q-factor specifications differ between the two components. The P8J specifies Q @ 1500 at 250MHz, while the 27291SL specifies Q @ 3000 at 100MHz. Both values are provided by the respective manufacturers and reflect measurement conditions specific to each component design. Functional substitution remains valid for applications requiring the specified electrical parameters.