Equivalent & Substitute Parts for A3F10 Trimmer Capacitor

Part Overview

The A3F10 is a 1–10pF trimmer capacitor manufactured by Knowles Voltronics, designed for through-hole mounting with top adjustment. Rated for 250V operation, this component is classified as obsolete. Due to its discontinued status, identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for repair, maintenance, and production applications.

Substiute Parts

A3F10

Knowles VoltronicsIn Stock: 1059A3F10 Datasheet

Current PartRFQ

AC10

Eaton - Bussmann Electrical DivisionIn Stock: 835AC10 Datasheet

Parametric EquivalentRFQ

GAA10007

Sprague-GoodmanIn Stock: 761GAA10007 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the A3F10 is determined by the following critical parameters:

• Capacitance Range: 1–10pF (exact match required)
• Voltage Rating: 250V minimum (equal or higher acceptable)
• Adjustment Type: Top adjustment (functional requirement)
• Mounting Type: Through hole (mechanical requirement)
• Physical Dimensions: Diameter and height within compatible tolerances
• Operating Temperature Range: –65°C to 125°C (minimum requirement)
• Dielectric Material: PTFE or air dielectric acceptable for RF/microwave applications

The GAA10007 manufactured by Sprague-Goodman meets all critical electrical and mechanical parameters. The AC10 fuse cartridge does not qualify as a functional substitute due to fundamental category mismatch (fuse vs. capacitor).

Parameter Comparison

Engineering Selection Recommendations

The GAA10007 is the qualified substitute for the A3F10. Both components are obsolete; however, the GAA10007 maintains full electrical and mechanical compatibility with identical capacitance range, voltage rating, adjustment mechanism, and mounting configuration. Physical dimensions are within acceptable tolerance (0.299" vs. 0.300" diameter; height identical at 0.500"). The GAA10007 features superior Q factor (5000 @ 100MHz vs. 2000 @ 100MHz), which provides performance advantage in RF applications. Both components comply with RoHS requirements and carry identical ECCN and HTSUS classifications.

The AC10 is not suitable for substitution, as it is a fuse cartridge with fundamentally different electrical characteristics, function, and application scope.

Frequently Asked Questions (FAQ)

Q: Can the GAA10007 directly replace the A3F10 in existing designs?

A: Yes. The GAA10007 matches all critical electrical parameters (1–10pF capacitance, 250V rating, top adjustment) and mechanical specifications (through-hole mounting, identical height, compatible diameter). Physical dimensions are within tolerance for standard PCB layouts.

Q: What is the difference in dielectric material between A3F10 and GAA10007?

A: The A3F10 uses PTFE dielectric, while the GAA10007 uses air dielectric. Both are suitable for RF and microwave applications. Air dielectric typically offers higher Q factor, as reflected in the GAA10007 specification (5000 @ 100MHz vs. 2000 @ 100MHz).

Q: Are both parts obsolete?

A: Yes. Both the A3F10 and GAA10007 are classified as obsolete. Inventory availability should be confirmed with authorized distributors before design commitment.

Q: Why is AC10 listed but not recommended?

A: The AC10 is a fuse cartridge (10A, 550VAC/250VDC), not a capacitor. It serves a different electrical function and is not compatible with circuits designed for trimmer capacitor operation. This part number appears in historical records but does not qualify as a functional substitute.

Q: What are the key parameters to verify before substitution?

A: Confirm capacitance range (1–10pF), voltage rating (250V), adjustment type (top), mounting type (through hole), and physical fit within PCB layout constraints (0.299–0.300" diameter, 0.500" height maximum).