Custom Electronics

What Custom Electronics does

Custom Electronics, Inc. (CEI) is a privately held, make-to-order manufacturer of high-voltage electronic components and integrated sub-assemblies, founded in 1964 and headquartered at 87 Browne St, Oneonta, NY. The company specializes in high-voltage reconstituted mica paper capacitors (the KMS, CKR, KVX series and XKM/XKH exploding foil initiator variants), specialty film capacitors via its Oneonta Technologies subsidiary, capacitor couplers, insulated bus bars and power distribution products, custom magnetic components (acquired from Newport Magnetics), and integrated electronic assemblies that combine capacitors, resistors, diodes, coils, spark gaps, and voltage dividers in epoxy-encapsulated modules. Technology differentiators include a proprietary Grade A mica paper formulation, proprietary epoxy encapsulation chemistries, and an internal test capability envelope that spans partial discharge testing to 20kVAC, dielectric withstanding voltage to 75kV, thermal cycling from -65°C to +200°C, and high-altitude testing to 70,000 ft, all backed by AS9100 / ISO 9001 certification. Underlying technology also extends into a proprietary battery management system for the CMP2500 LiFePO4 battery storage line.

CEI sells exclusively through quote-based, custom-engineered engagements to enterprise customers in five primary verticals: Military/Defense (primary), Aerospace/Space, Medical Electronics, Industrial/Oil & Gas, and Power & Energy. U.S. enterprise accounts are handled by an in-house direct sales team led by Sales Manager Michael Schulte, while seven international sales representative organizations cover the United Kingdom, Germany, France/Spain/Portugal, Taiwan, China, Turkey, and Israel. Use cases include power-supply systems for communications and weather satellites, guidance-system transmitters for missiles, shipboard defense radar, exploding foil initiators and safe-arm devices, down-hole oil and gas drilling electronics, medical imaging high-voltage capacitors, and (most recently, via an October 2025 partnership with GridEdge Networks) 69kV distributed-generation-permissive solutions for utility grid integration of renewable energy resources compliant with IEEE 1547-2018. CEI maintains no public pricing, no e-commerce channel, and operates on multi-year contract terms with its custom design customers.

The firm is founder- and management-owned with no disclosed institutional or venture capital backing. Operational subsidiaries include the Power Systems Division, Oneonta Technologies, Inc. (film capacitors), and Ioxus (ultracapacitors, created in 2007). Leadership comprises CEO Michael Pentaris (joined as a turnaround executive, introduced lean manufacturing and a dedicated business development function), President / VP of Operations Carol Brower (two decades of internal tenure, led the Ioxus spin-out setup, the implementation of a new MRP system, and two subsequent business acquisitions), Board Vice Chairman Jonathan Dokuchitz (joined 2007, led LEAN implementation and serves as ITAR/BIS compliance officer), and Sales Manager Michael Schulte (with CEI since 1985).

Name

Custom Electronics

Legal name

Custom Electronics, Inc.

Website

https://customelec.com

Company type

Private

Founded year

1964

Operating status

Operating

Headcount range

51–100 employees

Short description

Custom Electronics, Inc. is a privately held make-to-order manufacturer of high-voltage mica paper capacitors, film capacitors, capacitor couplers, bus bars, magnetics, and integrated electronic assemblies. It serves military, aerospace, medical, oil and gas, and energy customers through direct sales and a seven-country international representative network.

Ownership category

akta.pro rank

Product category

High-Voltage Electronic Components Manufacturing

NAICS

Capacitor, Resistor, Coil, Transformer, and Other Inductor Manufacturing (334416), Printed Circuit Assembly (Electronic Assembly) Manufacturing (334418), Electrical Equipment Manufacturing (33531)

SIC

Electronic Components & Accessories (3670), Electronic Coils, Transformers & Other Inductors (3677), Electronic Components, Nec (3679)

akta.pro primary industry

Passive Components (Resistors, Capacitors, Inductors, Ferrites) (IMAGAJAA)

akta.pro secondary industries

Military Power Supplies, RF/Microwave Components & Ruggedized Electronics (IMABAGAJ), EV/Industrial Charging Power Electronics (Chargers, rectifiers, power stages) (IMAGADAF), Low-Voltage Switchboards & Panelboards (LV distribution panels, MCCs, switchboards) (IMAGAEAA)

Keywords

• High voltage capacitors
• Mica paper capacitors
• Electronic assemblies manufacturing
• Custom bus bars
• Energy storage systems

Headquarters

HQ city

Oneonta

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Custom Capacitor Sales: Make-to-order manufacturing of high-voltage mica paper capacitors and specialty film capacitors. Over 15,000 capacitor designs created. Revenue from one-time custom manufacturing orders.
2. Integrated Electronic Assemblies/Modules: Custom module units combining capacitors with resistors, diodes, coils, spark gaps, and voltage dividers. Encapsulated with proprietary epoxies for military, aerospace, and industrial applications.
3. Bus Bars and Power Distribution Products: Insulated bus bars, bus bar assemblies, and integrated energy storage solutions. Used in industrial motor drives, renewable energy generation, power conditioning, distribution, and military/aerospace systems.
4. Power & Energy Solutions (Battery Systems): CMP2500 battery systems with LiFePO4 cells featuring 2.5kWh per battery, up to 10kWh capacity at 24VDC. Custom application-specific energy storage solutions for military, emergency response, and commercial applications.
5. Magnetic Solutions: Custom magnetic components including transformers, inductors, coils, magnetic pickups, speed sensors. From prototype to large volume production runs.

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels4 records

Core offering

Custom Electronics, Inc. (CEI) is a make-to-order manufacturer of high-voltage mica paper capacitors, specialty film capacitors, capacitor couplers, integrated electronic sub-assemblies, insulated bus bars, magnetic components, and LiFePO4 battery storage systems. All products are custom-designed and built to specification for military, aerospace, industrial, medical electronics, oil and gas, and utility/energy customers, with over 15,000 unique capacitor designs produced since 1964.

Product overview

Custom Electronics (CEI) is a make-to-order manufacturer offering a portfolio of high-voltage electronic components and integrated assemblies. The core product line centers on mica paper capacitors and specialty film capacitors (Custom Solutions, KMS Series, CKR, KVX Series, XKM/XKH Exploding Foil Initiators, Film Capacitors), supplemented by capacitor couplers, the CMP2500 battery storage system with proprietary BMS, magnetic solutions (pickups, sensors, coils, inductors, transformers), bus bars (single insulated, multi-layer, integrated assemblies, PCB stiffeners), and integrated electronic assemblies/modules. Since 1964, CEI has served military, industrial, commercial, aerospace, medical, and energy markets with customizable, high-reliability components.

Differentiator

Problem solved

Functional benefit

Brands

• Oneonta Technologies, Inc. Film capacitors product line including metallized polypropylene capacitors for the Power Electronics industry.

Products and services

• High-Voltage Mica Paper and Film Capacitors Custom-designed high-voltage mica paper and metallized polypropylene film capacitors with voltage ratings up to 100 kVDC, capacitance from 10 pF to 10 µF, and temperature range -65°C to 260°C. Includes KMS Series, CKR, KVX Series, XKM/XKH Exploding Foil Initiator variants, and film capacitors for power electronics. Built make-to-order for demanding military, aerospace, medical, and industrial applications.
• Capacitor Couplers Custom-designed capacitor couplers using mica paper, splintered mica, or ceramic disc dielectric. Dry systems (no oil) for indoor/outdoor use, -55°C to 125°C, ratings to 40 kVAC, for power distribution, partial discharge monitoring, smart grid, MV-PLC, and overvoltage protection.
• CMP2500 Battery Storage System Portable power system using LiFePO4 lithium-iron phosphate cells with proprietary Battery Management System (BMS), modular integrated design, housed in a rugged military-spec case. 2.5 kWh per battery; up to 10 kWh at 24 VDC or 5 kWh at 12 VDC. Designed for military/defense field and training applications including drone charging, simulations, targetry, and silent watch, plus commercial backup power.
• Magnetic Solutions Custom magnetic components including magnetic pickups, speed sensors, coils, inductors, toroids, transformers, air coils, edge winding, and PCB/wire assemblies. Serves industrial, military, and commercial markets with prototyping, custom design, and manufacturing capabilities from prototype through large-volume production runs.
• Bus Bars Insulated bus bars and bus bar assemblies including single insulated conductors, multi-layer conductors, integrated electronic assemblies, and PCB StrongBar stiffeners. Multi-layer laminations with Mylar, Kapton, Nomex, G10; dielectric strength 800 V/mil; thicknesses .003 to .060 inches. Used in industrial motor drives, renewable energy generation, power conditioning, distribution, conversion, and military/aerospace systems.
• Integrated Electronic Assemblies High-voltage / high-temperature module units combining capacitors, resistors, diodes, coils, spark gaps, and voltage dividers, encapsulated with proprietary epoxies. Suitable for high-altitude applications and extreme environments including -65°C to 200°C. Used in power supplies for satellites, radar/transmitter power supplies for military aircraft, guidance system transmitters for missiles, radar transmitters for shipboard defense, and down-hole oil and gas exploration power supplies.
• 69kV Distributed Generation Permissive (DGP) Solution Utility grid solution that uses existing Coupling Capacitor Voltage Transformers to enable 69kV Distributed Generation Permissive (DGP) without building expensive fiber optic infrastructure. Automatically disconnects renewable sources during grid faults to prevent unintentional islanding and meets IEEE 1547-2018 interconnection standards. Immediately available for sub-transmission applications for U.S. utility partners.

Quantifiable outcome

• Dielectric strength of 800v/mil for powder-coated bus bars
• +4 more outcomes

Named customers5 records

Segments5 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Three partnerships are on record, tiered core and minor.

• GridEdge NetworkscoreStrategic or Co-development Partner · 8 October 2025Partnership to launch 69kV Distributed Generation Permissive (DGP) solution for safer, more cost-effective integration of distributed energy resources into utility grids. The solution leverages existing Coupling Capacitor Voltage Transformers to eliminate expensive fiber optic installations (hundreds of thousands of dollars), automatically disconnects renewable sources during grid faults to prevent unintentional islanding, and meets IEEE 1547-2018 interconnection standards. Developed with U.S. utility partners and immediately available.
• NYSERDA (New York State Energy Research and Development Authority)minorStrategic or Co-development PartnerNYSERDA-supported project enhanced CEI's high-temperature/high-voltage module capabilities. NYSERDA provides funding and support for clean energy technology development in New York State.
• IoxusminorStrategic or Co-development PartnerUltracapacitor manufacturer created by CEI in 2007. Carol Brower instrumental in setup of new infrastructure including supply chain, equipment acquisition and transport. Ioxus operates as a separate business entity.

Scale indicators4 records

Recent moves6 records

Expansion highlights6 records

Emerging players

• Maxwell Technologies (Tesla): Maxwell Technologies, now part of Tesla, pioneered ultracapacitor technology adjacent to CEI's Ioxus subsidiary. Overlaps with CEI's high-power, fast-discharge energy storage applications and battery management focus areas.

Broad incumbents

• Vishay Intertechnology: Vishay is a broad-line manufacturer of discrete semiconductors and passive components, including capacitors and inductors used in military, aerospace, and industrial applications. Direct competition for CEI's magnetic and capacitor lines, but as part of a much larger portfolio.
• KEMET (Yageo): KEMET, now part of Yageo, is one of the world's largest capacitor manufacturers offering tantalum, ceramic, film, and paper capacitors. Overlaps with CEI's film and specialty capacitor lines but competes at scale across broader markets including automotive and consumer.
• TDK Corporation: TDK (including EPCOS) manufactures electronic components, capacitors, magnetics, and power modules globally. A broad incumbent competing with CEI across capacitor couplers, magnetics, and industrial power electronics, with much greater scale and geographic reach.
• AVX Corporation (Kyocera AVX): AVX (now Kyocera AVX) manufactures passive components including tantalum, ceramic, and film capacitors for automotive, military, and industrial customers. Overlaps with CEI's specialty capacitor offering while serving mass-market applications at scale.
• Murata Manufacturing: Murata is a global leader in ceramic capacitors and electronic modules serving automotive, communications, and industrial markets. Broad incumbent with limited overlap on high-voltage mica but competes for design sockets in EV, renewable, and power electronics.

Direct peers

• Coilcraft: Coilcraft manufactures custom and standard inductors, transformers, and chokes for military, aerospace, and industrial markets. Direct comparable to CEI's Magnetic Solutions product line (inductors, coils, transformers, magnetic pickups).
• Cornell Dubilier Electronics: Cornell Dubilier is a US manufacturer of capacitors (including mica, film, and aluminum electrolytic) serving military, aerospace, and industrial customers. Highly comparable to CEI's core mica paper and film capacitor business with overlapping defense and high-reliability end markets.
• WIMA: WIMA specializes in film capacitors (including polypropylene) for power electronics, automotive, and industrial applications. Closely aligned with CEI's film capacitor line serving motor drives, EV/industrial inverters, and renewable energy power conditioning.
• Capacitor Industries: Capacitor Industries manufactures custom high-voltage capacitors and related assemblies for industrial, medical, and military markets. Comparable custom make-to-order manufacturer with similar voltage and reliability envelope to CEI's mica and film capacitors.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/CustomElectron1
• Facebookfacebook.com/Custom.Elec
• LinkedInlinkedin.com/company/custom-electronics-inc

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries3 records

Funding overview

Funding rounds5 records

Investors1 record

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Custom Electronics