EM25HV Trimmer Capacitor Equivalent & Substitute Parts

Part Overview

The EM25HV is a 1–23pF trimmer capacitor rated for 750V operation, designed for surface mount applications with top adjustment. Manufactured by Knowles Voltronics, this component features a PTFE dielectric and operates across the temperature range of –65°C to 125°C. The EM25HV is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications. Substitute parts must maintain identical electrical performance and mechanical compatibility to ensure direct replacement without circuit redesign.

Substiute Parts

EM25HV

Knowles VoltronicsIn Stock: 1141EM25HV Datasheet

Current PartRFQ

AM25HV

Knowles VoltronicsIn Stock: 913AM25HV Datasheet

Parametric EquivalentRFQ

NMAM25HV

Knowles VoltronicsIn Stock: 1317NMAM25HV Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the EM25HV are qualified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match Exactly):

• Capacitance range: 1–23pF
• Voltage rating: 750V
• Dielectric material: PTFE
• Q factor: 2000 @ 100MHz

Mechanical Parameters (Must Match Exactly):

• Adjustment type: Top
• Mounting type: Surface Mount
• Physical dimensions: 0.300" Dia (7.62mm)
• Maximum seated height: 0.480" (12.19mm)

Environmental Parameters (Must Match Exactly):

• Operating temperature range: –65°C to 125°C
• Moisture sensitivity level: 1 (Unlimited)

Both substitute parts (AM25HV and NMAM25HV) satisfy all electrical, mechanical, and environmental requirements. The primary distinction between substitutes relates to product status and specific features, not performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

AM25HV: This part is an active equivalent offering identical electrical and mechanical specifications to the obsolete EM25HV. Both parts belong to the Knowles Voltronics high-voltage trimmer capacitor family and provide general-purpose functionality. AM25HV is suitable for direct replacement in applications where RoHS compliance is not a requirement.

NMAM25HV: This part is an active equivalent with identical electrical and mechanical specifications, with the additional feature designation of non-magnetic construction. NMAM25HV is suitable for direct replacement in applications where RoHS compliance is not a requirement and where non-magnetic properties are beneficial or required.

Both substitute parts are available in active production status, ensuring long-term supply availability compared to the obsolete EM25HV. Selection between AM25HV and NMAM25HV depends on whether non-magnetic characteristics are specified in the application requirements.

Frequently Asked Questions (FAQ)

Q: Can AM25HV or NMAM25HV be used as direct replacements for EM25HV?

A: Yes. Both parts meet all electrical and mechanical parameters required for direct substitution. They maintain identical capacitance range (1–23pF), voltage rating (750V), dielectric material (PTFE), physical dimensions, and operating temperature range (–65°C to 125°C).

Q: What is the difference between AM25HV and NMAM25HV?

A: Both parts are electrically and mechanically identical. The primary distinction is the feature designation: AM25HV is specified as general purpose, while NMAM25HV includes non-magnetic construction. Selection depends on application-specific requirements for magnetic properties.

Q: Why is EM25HV classified as obsolete?

A: The EM25HV has been discontinued by the manufacturer. AM25HV and NMAM25HV are active production equivalents from the same manufacturer, ensuring continued availability and supply chain reliability.

Q: Are there any compliance differences between the three parts?

A: All three parts carry identical ECCN (EAR99) and HTSUS (8532.30.0090) classifications. AM25HV and NMAM25HV are both RoHS non-compliant and REACH Unaffected. Compliance status for EM25HV was not specified in available documentation.

Q: What packaging options are available?

A: EM25HV is available in standard packaging. AM25HV and NMAM25HV are supplied in bulk packaging. Confirm packaging requirements with your procurement specification before ordering.

Q: Are the physical dimensions identical across all three parts?

A: Yes. All three parts share identical dimensions: 0.300" diameter (7.62mm) with a maximum seated height of 0.480" (12.19mm). They are fully compatible for PCB layout and mechanical assembly.