Equivalent & Substitute Parts for P12B Trimmer Capacitor

Part Overview

The P12B is a 1–12pF trimmer capacitor manufactured by Knowles Voltronics, designed for 500V applications with side adjustment and through-hole mounting. This component features a sapphire dielectric with sealed construction and operates across the temperature range of –55°C to 125°C. The P12B is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and component procurement.

Substiute Parts

P12B

Knowles VoltronicsIn Stock: 1066P12B Datasheet

Current PartRFQ

57291

Knowles Johanson ManufacturingIn Stock: 74757291 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P12B trimmer capacitor is based on the following critical parameters:

• Capacitance Range: The substitute must cover or encompass the 1–12pF range
• Voltage Rating: Minimum 500V rated voltage to maintain electrical safety margins
• Adjustment Type: Side adjustment mechanism for mechanical compatibility
• Mounting Type: Through-hole configuration for PCB integration
• Physical Dimensions: Compatible package size to fit existing board layouts
• Operating Temperature Range: Support for –55°C to 125°C operational envelope
• Dielectric Material: Sapphire or equivalent high-stability dielectric

The part 57291 from Knowles Johanson Manufacturing is identified as a manufacturer-recommended substitute. However, complete parameter specifications for the 57291 are not fully documented in available data, limiting detailed cross-reference validation.

Parameter Comparison

Engineering Selection Recommendations

The 57291 is designated as the manufacturer-recommended substitute for the obsolete P12B. Both components share identical ECCN and HTSUS classifications, confirming regulatory alignment. The 57291 carries active product status and RoHS compliance certification, supporting long-term availability and environmental regulatory requirements.

Selection of the 57291 as a replacement should be validated against the specific electrical and mechanical requirements of the target application, particularly where capacitance range, voltage rating, adjustment mechanism, and physical footprint are critical design constraints.

Frequently Asked Questions (FAQ)

Q: Why is the P12B classified as obsolete? A: The P12B is no longer in active production. The 57291 represents the current active alternative from the same manufacturer family.

Q: What are the critical parameters for substitution? A: Capacitance range (1–12pF), voltage rating (500V minimum), adjustment type (side), mounting configuration (through-hole), and physical dimensions must align with the original design requirements.

Q: Is the 57291 a direct pin-for-pin replacement? A: Both components are trimmer capacitors with through-hole mounting. Physical compatibility must be confirmed against PCB layout and mechanical constraints specific to your application.

Q: What is the difference in moisture sensitivity between the two parts? A: The P12B lists MSL as Not Applicable, while the 57291 is rated MSL 1 (Unlimited). This indicates the 57291 has minimal moisture sensitivity and does not require special handling or storage conditions.

Q: Are there regulatory or compliance differences? A: Both parts share the same ECCN (EAR99) and HTSUS (8532.30.0090) classifications. The 57291 carries RoHS compliance certification, which may be required for certain end-use applications.

Q: Where can I find complete technical specifications for the 57291? A: Detailed specifications for the 57291 should be obtained directly from Knowles Johanson Manufacturing or authorized distributors to confirm all electrical and mechanical parameters.