Equivalent & Substitute Parts for A2P1 Trimmer Capacitor

Part Overview

The A2P1 is a 0.3–1.2 pF trimmer capacitor manufactured by Knowles Voltronics, designed for surface mount applications with a rated voltage of 250 V and PTFE dielectric. This component is classified as obsolete, making identification of functionally equivalent substitutes necessary for ongoing design support and production continuity. Substitute parts must maintain the specified capacitance range, voltage rating, and general-purpose application profile while accommodating differences in mounting technology and adjustment mechanism.

Substiute Parts

A2P1

Knowles VoltronicsIn Stock: 743A2P1 Datasheet

Current PartRFQ

GNC1R250

Sprague-GoodmanIn Stock: 1036GNC1R250 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the A2P1 are identified based on the following critical parameters:

• Capacitance Range: Substitute must provide 0.3–1.2 pF adjustment capability
• Voltage Rating: Substitute must meet or exceed 250 V rated voltage
• Dielectric Material: Substitute must use PTFE or equivalent high-frequency dielectric
• General Purpose Classification: Substitute must be designated for general-purpose trimmer applications
• Operating Temperature: Substitute must support the –65°C to 125°C range or broader

Mounting type (surface mount vs. through hole) and adjustment mechanism (top vs. side) may differ in substitutes, provided the electrical performance and environmental specifications remain compatible with the original application requirements.

Parameter Comparison

Engineering Selection Recommendations

The GNC1R250 (Sprague-Goodman PISTONCAP®) provides electrical equivalence to the A2P1 within the specified capacitance range of 0.3–1.2 pF. Both components are classified as obsolete and carry identical moisture sensitivity ratings (MSL 1, Unlimited). The GNC1R250 offers a higher voltage rating (500 V vs. 250 V), which provides additional design margin in high-voltage applications.

Key differences requiring design consideration:

• Mounting Technology: The GNC1R250 is through-hole mounted, whereas the A2P1 is surface mount. PCB layout and assembly process modifications are necessary.
• Adjustment Mechanism: The GNC1R250 uses side adjustment versus the A2P1's top adjustment, affecting physical accessibility and tuning procedure.
• Dielectric Material: The GNC1R250 uses sapphire dielectric instead of PTFE, resulting in higher Q factor (4000 @ 250 MHz vs. 2000 @ 100 MHz).
• Operating Temperature Lower Limit: The GNC1R250 operates to –55°C, whereas the A2P1 extends to –65°C. Applications requiring operation below –55°C require alternative evaluation.

Both components are RoHS compliant and carry identical ECCN and HTSUS classifications.

Frequently Asked Questions (FAQ)

Q: Can the GNC1R250 directly replace the A2P1 in an existing surface mount assembly?

A: No. The GNC1R250 is a through-hole component, while the A2P1 is surface mount. PCB redesign and assembly process changes are required.

Q: Does the higher voltage rating of the GNC1R250 (500 V vs. 250 V) affect circuit performance?

A: The voltage rating does not affect circuit performance in applications operating below the rated voltage. The higher rating provides additional safety margin and component longevity in high-voltage environments.

Q: Are there differences in tuning procedure between top-adjustment and side-adjustment trimmers?

A: Yes. Top-adjustment (A2P1) and side-adjustment (GNC1R250) mechanisms require different physical access and tuning tool orientation. Assembly and maintenance procedures must be adapted accordingly.

Q: What is the significance of the Q factor difference between these components?

A: The GNC1R250 exhibits higher Q (4000 @ 250 MHz) compared to the A2P1 (2000 @ 100 MHz), indicating lower dielectric loss at higher frequencies. This may improve circuit efficiency in RF and microwave applications.

Q: Are both components suitable for applications requiring operation below –55°C?

A: The A2P1 operates to –65°C, while the GNC1R250 operates to –55°C. For applications requiring operation below –55°C, the A2P1 specification must be maintained or alternative components evaluated.

Q: Do both components carry the same regulatory compliance?

A: Yes. Both the A2P1 and GNC1R250 carry identical ECCN (EAR99) and HTSUS (8532.30.0090) classifications. The GNC1R250 is additionally marked as RoHS Compliant.