A3P10 Trimmer Capacitor Equivalent & Substitute Parts

Part Overview

The A3P10 is a 1–10pF trimmer capacitor manufactured by Knowles Voltronics, rated for 250V operation with side adjustment and through-hole mounting. This component is classified as obsolete, making identification of compatible substitutes essential for ongoing maintenance, repair, and legacy system support. The A3P10 operates across the temperature range of –65°C to 125°C and features a PTFE dielectric with a Q factor of 2000 @ 100MHz.

Substiute Parts

A3P10

Knowles VoltronicsIn Stock: 980A3P10 Datasheet

Current PartRFQ

5201

Knowles Johanson ManufacturingIn Stock: 31385201 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A3P10 is determined by the following critical parameters:

• Capacitance Range Overlap: The substitute must cover or encompass the 1–10pF range of the A3P10
• Voltage Rating: Must meet or exceed 250V
• Adjustment Type: Must be side-adjustable to maintain circuit tuning functionality
• Mounting Type: Must be through-hole to ensure PCB compatibility
• Operating Temperature Range: Must support –65°C to 125°C operation
• Physical Dimensions: Must fit within or be compatible with existing PCB footprints

The 5201 trimmer capacitor from Knowles Johanson Manufacturing satisfies these substitution criteria. Although the 5201 offers an extended lower capacitance limit (0.8pF) and uses an air dielectric instead of PTFE, it maintains full overlap with the A3P10's 1–10pF operating window, identical voltage rating, side adjustment, through-hole mounting, and matching temperature range.

Parameter Comparison

Engineering Selection Recommendations

The 5201 is the designated manufacturer-recommended substitute for the A3P10. Selection of the 5201 is supported by the following factors:

• Active Product Status: The 5201 is in active production, ensuring long-term availability and supply chain continuity
• Regulatory Compliance: The 5201 is ROHS3 compliant, meeting current environmental and material restriction standards
• Electrical Compatibility: Identical voltage rating (250V), adjustment type (side), and operating temperature range (–65°C to 125°C) ensure direct functional equivalence
• Physical Compatibility: Dimensions are within acceptable tolerance for through-hole PCB mounting (0.295" vs. 0.300" diameter represents a 0.005" difference)
• Performance Enhancement: The 5201 provides superior Q factor (5000 @ 100MHz vs. 2000 @ 100MHz), resulting in lower losses and improved circuit performance

Frequently Asked Questions (FAQ)

Q: Can the 5201 be used as a direct replacement for the A3P10 in existing designs?

A: Yes. The 5201 meets all critical electrical and mechanical parameters: 250V rating, side adjustment, through-hole mounting, –65°C to 125°C temperature range, and capacitance range overlap (0.8–10pF encompasses 1–10pF). Physical dimensions are compatible with standard through-hole PCB layouts.

Q: What is the difference between the PTFE dielectric in the A3P10 and the air dielectric in the 5201?

A: Both dielectrics are suitable for high-frequency trimmer capacitor applications. The air dielectric in the 5201 contributes to its higher Q factor (5000 vs. 2000 @ 100MHz), indicating lower dielectric losses. Selection between them depends on specific circuit requirements; both are electrically valid substitutes within the stated parameters.

Q: Are there any packaging differences between the A3P10 and 5201?

A: The A3P10 is specified with packaging designation "–" (not detailed), while the 5201 is supplied in bulk packaging. Both are through-hole components suitable for manual or automated assembly. Verify packaging requirements with your procurement process.

Q: Does the 5201's extended lower capacitance limit (0.8pF vs. 1pF) affect compatibility?

A: No. The extended range is a superset of the A3P10's range. Circuits designed for 1–10pF operation will function identically with the 5201's 0.8–10pF range. The additional 0.2pF of lower capacitance does not introduce incompatibility.

Q: Is the 5201 RoHS compliant?

A: Yes. The 5201 is ROHS3 compliant, meeting current environmental and material restriction standards. The A3P10's RoHS status is not specified in the available data.