A3T10 Trimmer Capacitor Equivalent & Substitute Parts

Part Overview

The A3T10 is a 1–10pF trimmer capacitor rated for 250V operation with top panel mount configuration, manufactured by Knowles Voltronics. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The A3T10 uses polytetrafluoroethylene (PTFE) dielectric material and is designed for general-purpose applications requiring precision capacitance adjustment in the 1–10pF range.

Key Parameters

Parameter	Value
Capacitance Range	1–10pF
Voltage Rating	250V
Adjustment Type	Top
Mounting Type	Panel Mount
Size / Dimension	0.300" Dia (7.62mm)
Height – Seated (Max)	0.500" (12.70mm)
Operating Temperature Range	–65°C to 125°C
Dielectric Material	Polytetrafluoroethylene (PTFE)
Q @ 100MHz	2000
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the A3T10 is determined by strict alignment of the following electrical and mechanical parameters:

Capacitance Range: 1–10pF (exact match required)
Voltage Rating: 250V (exact match required)
Adjustment Type: Top (exact match required)
Mounting Type: Panel Mount (exact match required)
Operating Temperature Range: –65°C to 125°C (exact match required)
Physical Dimensions: 0.300" Dia (7.62mm) and 0.500" (12.70mm) height (exact match required for AT10L and AT10N; GAA10001 has 0.236" Dia, representing a dimensional variant)

The substitute parts are classified into two categories:

Parametric Equivalents (Knowles Voltronics): AT10L and AT10N maintain identical electrical specifications and mounting dimensions to the A3T10. Both are active products with air dielectric, higher Q factor (5000 @ 100MHz), and RoHS3 compliance.

Direct Manufacturer Substitute (Sprague-Goodman): GAA10001 is a cross-manufacturer equivalent from the AIRTRIM® GAA series with matching electrical parameters and operating temperature range. Physical diameter differs (0.236" vs. 0.300"), requiring mechanical fit verification in panel mount applications.

Parameter Comparison

Parameter	A3T10	AT10L	AT10N	GAA10001
Manufacturer	Knowles Voltronics	Knowles Voltronics	Knowles Voltronics	Sprague-Goodman
Capacitance Range	1–10pF	1–10pF	1–10pF	1–10pF
Voltage Rating	250V	250V	250V	250V
Adjustment Type	Top	Top	Top	Top
Mounting Type	Panel Mount	Panel Mount	Panel Mount	Panel Mount
Size / Dimension	0.300" Dia (7.62mm)	0.300" Dia (7.62mm)	0.300" Dia (7.62mm)	0.236" Dia (6.00mm)
Height – Seated (Max)	0.500" (12.70mm)	0.500" (12.70mm)	0.500" (12.70mm)	0.500" (12.70mm)
Operating Temperature	–65°C to 125°C	–65°C to 125°C	–65°C to 125°C	–65°C to 125°C
Dielectric Material	PTFE	Air	Air	Air
Q @ 100MHz	2000	5000	5000	5000
Product Status	Obsolete	Active	Active	Obsolete
RoHS Status	Not specified	RoHS3 Compliant	RoHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

Primary Substitutes: AT10L and AT10N are the preferred alternatives to A3T10. Both are active products from the original manufacturer with identical electrical and mechanical specifications. AT10L is available in bulk packaging with 1136 units in stock, while AT10N is available with 872 units in stock. Both meet RoHS3 compliance and REACH unaffected status, supporting modern regulatory requirements. The higher Q factor (5000 @ 100MHz) compared to the A3T10 (2000 @ 100MHz) indicates improved performance characteristics in high-frequency applications.

Secondary Substitute: GAA10001 from Sprague-Goodman is a direct electrical equivalent with matching voltage, capacitance, and temperature specifications. However, the reduced physical diameter (0.236" vs. 0.300") requires mechanical fit assessment for panel mount hole sizing. GAA10001 is classified as obsolete, limiting long-term availability. This part is suitable only when mechanical constraints permit the smaller diameter and when AT10L or AT10N are unavailable.

Frequently Asked Questions (FAQ)

Q: Can AT10L or AT10N be used as direct drop-in replacements for A3T10?

A: Yes. AT10L and AT10N maintain identical capacitance range (1–10pF), voltage rating (250V), adjustment type (top), mounting type (panel mount), and physical dimensions (0.300" Dia, 0.500" height). Both are active products with enhanced performance characteristics.

Q: What is the difference between AT10L and AT10N?

A: AT10L and AT10N are electrically and mechanically identical. The primary difference is packaging: AT10L is supplied in bulk packaging, while AT10N packaging is not specified. Both have identical electrical parameters, inventory levels, and compliance certifications.

Q: Is GAA10001 compatible with A3T10 in all applications?

A: GAA10001 matches all electrical parameters and operating temperature range. However, the physical diameter is 0.236" compared to A3T10's 0.300". Panel mount hole sizing must be verified before substitution. GAA10001 is obsolete, making it unsuitable for new designs requiring long-term component availability.

Q: What is the significance of the dielectric material difference between A3T10 and the substitute parts?

A: A3T10 uses PTFE dielectric, while AT10L, AT10N, and GAA10001 use air dielectric. Air dielectric trimmer capacitors typically exhibit higher Q factors (5000 @ 100MHz vs. 2000 @ 100MHz for A3T10), resulting in lower losses and improved performance in high-frequency circuits. Both dielectric types are suitable for the specified 1–10pF, 250V application.

Q: Are there compliance or regulatory differences between these parts?

A: AT10L and AT10N are RoHS3 compliant and REACH unaffected, meeting current regulatory standards. GAA10001 is RoHS compliant but lacks RoHS3 and REACH documentation. For applications requiring modern compliance certifications, AT10L or AT10N are the appropriate selections.

Q: What inventory levels are available for each substitute?

A: AT10L has 1136 units in stock, AT10N has 872 units in stock, and GAA10001 has 1148 units in stock. All parts are listed as new original stock.

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