AJ30 Trimmer Capacitor Equivalent & Substitute Parts

Part Overview

The AJ30 is an active, production-status trimmer capacitor manufactured by Knowles Voltronics, designed for surface mount applications requiring variable capacitance adjustment. This 1.5–30pF trimmer capacitor operates at 250V rated voltage with side adjustment capability and PTFE dielectric material. Finding equivalent or substitute parts may be necessary due to inventory constraints, supply chain considerations, or specific application requirements where alternative mechanical dimensions are acceptable within the design envelope.

Substiute Parts

AJ30

Knowles VoltronicsIn Stock: 999AJ30 Datasheet

Current PartRFQ

NMAJ30

Knowles VoltronicsIn Stock: 1063NMAJ30 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The NMAJ30 is classified as a parametric equivalent to the AJ30 based on the following critical substitution criteria:

Matching Parameters (Substitution Basis):

• Capacitance Range: 1.5 ~ 30pF (identical)
• Voltage - Rated: 250 V (identical)
• Adjustment Type: Side (identical)
• Dielectric Material: PTFE (identical)
• Mounting Type: Surface Mount (identical)
• Operating Temperature Range: -65°C ~ 125°C (identical)
• Height - Seated (Max): 0.500" (12.70mm) (identical)
• RoHS Status: ROHS3 Compliant (identical)
• Moisture Sensitivity Level: 1 (Unlimited) (identical)

Differing Parameters (Non-Critical for Substitution):

• Size / Dimension: AJ30 is 0.250" Dia (6.35mm); NMAJ30 is 0.300" Dia (7.62mm)
• Features: AJ30 is General Purpose; NMAJ30 is Non-Magnetic
• Series: AJ30 has no series designation; NMAJ30 belongs to A_HV series

The dimensional difference in diameter does not affect electrical performance and represents a mechanical variation acceptable for applications where PCB layout permits the larger footprint.

Parameter Comparison

Engineering Selection Recommendations

Both the AJ30 and NMAJ30 are active production parts from Knowles Voltronics with identical electrical specifications and full compliance with ROHS3 and REACH regulations. Selection between these parts should be based on:

AJ30 Selection Criteria:

• Applications with strict PCB space constraints requiring the smaller 0.250" diameter footprint
• General-purpose trimmer capacitor applications without magnetic field sensitivity requirements

NMAJ30 Selection Criteria:

• Applications requiring non-magnetic properties for use in magnetically sensitive environments
• PCB layouts that accommodate the larger 0.300" diameter footprint
• Applications within the A_HV series product line

Both parts maintain identical electrical performance across the full operating temperature range and voltage rating. The choice between them is determined by mechanical fit and application-specific requirements such as magnetic field immunity.

Frequently Asked Questions (FAQ)

Q: Can NMAJ30 be used as a direct replacement for AJ30?

A: Yes, provided the PCB layout accommodates the larger 0.300" diameter of the NMAJ30 compared to the 0.250" diameter of the AJ30. All electrical parameters, voltage ratings, capacitance ranges, and operating temperature specifications are identical.

Q: What is the significance of the "Non-Magnetic" feature in NMAJ30?

A: The Non-Magnetic designation indicates that the NMAJ30 does not introduce magnetic field interference. This is relevant for applications in proximity to sensitive magnetic components or in magnetically shielded environments. The AJ30 carries no such specification.

Q: Are there any compliance differences between AJ30 and NMAJ30?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited). Regulatory and environmental compliance is equivalent.

Q: Does the difference in Q factor affect substitution?

A: The AJ30 specifies Q @ 100MHz as 2000, while NMAJ30 does not provide this specification. For applications where Q factor is a critical design parameter, the AJ30 specification should be verified. For general-purpose trimmer applications, this difference does not preclude substitution.

Q: What are the packaging considerations for these parts?

A: Both parts are supplied in bulk packaging as surface mount components. No special handling or packaging differences exist between the two parts.