What Riedon does

Riedon is a US-based specialty manufacturer of precision and power resistors, founded in 1960 and headquartered in Alhambra, California. The company produces wirewound, thick film, thin film, and Bulk Metal Foil resistors with tolerances down to ±0.005% and TCR as low as 1ppm/°C, spanning surface mount, through-hole, chassis-mount, and TO-style packages with power handling up to 2.5kW and high-voltage ratings to 30kV. Its product portfolio also includes current-sense/shunt resistors, RTD temperature sensors, fuse resistors, and the Smart Shunt Series — digital DC current sensors combining passive shunt elements with closed-loop Hall-effect technology, integrated 16-bit automotive-grade MCUs, 24-bit ADCs, and RS-485/Modbus RTU or CAN bus interfaces. Riedon's core technologies include the proprietary Ayrton-Perry non-inductive winding technique and Bulk Metal Foil formulations.

The company serves industrial, medical, aerospace/defense, rail, and electric-vehicle/energy customers — including Boeing, Lockheed Martin, Performance Controls, defibrillator OEMs, and Vapor Stone Rail Systems — with applications ranging from MRI/CT scanners and defibrillators to missile assemblies and battery monitoring. It sells through a hybrid model of direct sales, the global electronics distributor Digi-Key, and regional partners such as Blume Elektronik in Germany, and it offers custom low-volume production runs (hundreds of units) alongside standard catalog parts. In April 2023, substantially all of Riedon's assets were acquired by Bourns Inc. through its subsidiary BE Services Company, Inc., and Riedon now operates as a brand under Bourns, continuing to focus on precision resistive and current-sensing solutions.

Name

Riedon

Legal name

Riedon Inc.

Website

https://riedon.com

Company type

Private

Founded year

1960

Operating status

Operating

Headcount range

251–500 employees

Short description

Riedon, founded in 1960 and based in Alhambra, California, manufactures precision wirewound, thick-film, thin-film, and foil resistors, plus Smart Shunt digital current sensors, serving aerospace/defense, medical, industrial, and EV/energy OEMs through direct sales and distributors. Acquired by Bourns Inc. in April 2023.

Ownership category

akta.pro rank

Product category

Precision Resistors

akta.pro primary industry

Resistors (Fixed/Variable/Network) (HDAHANAA)

Keywords

• Precision resistor manufacturing
• Wirewound resistors
• Current sense shunts
• Thick film resistors
• Custom power resistors

Headquarters

HQ city

Alhambra

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, Infrastructure

Revenue model

1. Resistor Sales: Riedon generates revenue through the sale of various resistor types including power, precision, surface mount, high temperature, high power, wirewound, thick film, thin film, and custom resistors. They also sell current sensing/shunt resistors and smart sensor products.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

Riedon is a precision resistor manufacturer that designs and produces power, precision, surface mount, high temperature, high power and custom resistors using wirewound, thick film, thin film and Bulk Metal Foil technologies. Its offering spans current sense/shunt resistors, high voltage resistors up to 30kV, high pulse/pulse-withstanding resistors, TO-style power resistors, AEC-Q200 compliant automotive resistors, non-magnetic resistors for MRI/CT applications, RTD temperature sensors, and the Smart Shunt series of digital DC current sensors. Customers include medical equipment, aerospace & defense, industrial electronics and electric vehicle/energy manufacturers served through direct sales and distributors such as Digi-Key and Blume Elektronik.

Product overview

Riedon is a precision resistor manufacturing company founded in 1960, specializing in power, precision, and custom resistors. The product portfolio includes Surface Mount, High Pulse/Pulse Withstanding, High Power & TO Type, High Voltage, Current Sense/Shunt, Precision, Wirewound, and Leaded resistors, along with the Smart Shunt series of digital DC current sensors. The company also offers Custom Resistors for specialized applications. Riedon's resistor technologies encompass thick film, thin film, wirewound (including Ayrton-Perry non-inductive winding), and Bulk Metal Foil. Key product series include the SSD Smart Shunt (digital DC current sensors with integrated MCU/ADC), CHR/HVC/HVS chip resistors, AEC-Q200 compliant CLSA series, and various precision wirewound series. The company was acquired by Bourns Inc. in April 2023 and operates as a subsidiary.

Differentiator

Problem solved

Functional benefit

Brands

• SSD Smart Shunt: Digital DC current sensors series featuring 16-bit automotive-grade MCU, 24-bit ADC, and flash memory for battery-related current sensing applications
• shunts.com

Products and services

• Surface Mount Resistors Surface mount resistor products for direct integration into printed circuit boards, available in various power ratings and precision levels for electronic manufacturers.
• High Pulse / Pulse Withstanding Resistors Resistors designed to withstand sudden current or voltage changes, transients and surge events, protecting electronic components from damage in specialized electronic equipment.
• High Power & TO Type Resistors High-power resistors in chassis mount and TO-style transistor outline packages (TO-126, TO-220, TO-247, TO-263) designed for efficient heat dissipation in demanding power electronics applications.
• High Voltage Resistors Resistors designed for high-voltage applications up to 6000V for chip resistors and 30kV for leaded versions, serving medical (CAT scan, CO2 lasers), oil & gas, instrumentation and defense sectors.
• Current Sense / Shunt Resistors Low-value resistors designed to sense current flow in electronic circuits, including precision shunt configurations for battery monitoring, energy storage and power management applications.
• Precision Resistors High-accuracy resistors with tight tolerances down to ±0.005% and low TCR down to ±1ppm/°C for applications requiring stable resistance values over time and temperature.
• Custom Resistors Custom-designed resistor solutions tailored to specific application requirements including custom packages, joule-rated parts, heater chips and specialized configurations, with low-volume production runs.
• Wirewound Resistors Precision wirewound resistors available as axial-leaded, aluminum-housed and surface mount variants with tolerances down to 0.005%, TCR as low as 1ppm/°C, and power handling up to 2.5kW.
• Leaded Resistors Traditional leaded resistor configurations for through-hole mounting, including precision and power variants for industrial and legacy applications.
• SSD Smart Shunt Series Digital DC Current Sensors Next-generation digital DC current sensors combining passive shunt resistors with closed-loop Hall-effect technology, featuring a 16-bit automotive-grade MCU, 24-bit ADC, flash memory with ECC and Modbus RTU or CAN bus interfaces for battery-related current sensing applications.
• SSA Smart Shunt Series Current Sensors Original Smart Shunt current sensor series combining conventional passive shunt resistors with closed-loop Hall-effect current sensor accuracy, eliminating the need for periodic calibration in battery management and energy storage applications.
• CHR Series Thick Film Chip Resistors Thick film chip resistors with high temperature capability up to 300°C, optional non-magnetic contacts (Pt-Ag, Pt-Pd-Ag), whisker-free surfaces and high voltage up to 6000V, with resistance values from 1Ω to 10MΩ in sizes 0402 to 4020.
• HVC Series High Value Chip Resistors High-voltage thick film chip resistors with resistance values from 10MΩ to 1TΩ for high-resistance applications.
• HVS Series Precision High Value Resistors Precision chip resistors in the high value range from 100KΩ to 10TΩ with specified temperature and voltage dependency properties.
• CLSA Series AEC-Q200 Compliant Resistors AEC-Q200 compliant current sensing chip resistors designed for automotive applications requiring automotive quality certification.
• MSR Series Ultra-Low Ohm Resistors Ultra-low ohm bare metal element through-hole resistors with power rating up to 5W using all-welded construction for automated circuit board mounting.
• HTE Series High-Voltage Thick Film Resistors High-voltage thick film resistors in non-inductive cylindrical construction with resistance values from 1kΩ to 100MΩ and tolerances of ±1% to ±10%.
• USR 2-0808 Series Ultra-Precision Foil Resistors Ultra-precision foil resistors with TCR as low as ±0.05ppm/°C, featuring low power coefficient of resistance and rapid thermal stabilization within seconds.
• PFC Series Thick Film Power SMD Resistors High-power surface mount chips replacing standard TO-126 (25W) SMT packages with only 1mm thickness, featuring non-inductive design for high-frequency and high-speed pulse applications.
• Metal-Clad Braking Resistors High-performance metal-clad braking resistors for high-power wirewound applications, designed for rugged environments and regenerative drive energy dissipation.
• RS Series DC Current Shunts Standard DC current shunts with current ratings from 5A to 10,000A using Manganin resistive elements, with standard tolerance of ±0.25% (optional ±0.1%) and TCR of ±15ppm/°C or better.
• Non-Magnetic Resistors Non-magnetic chip resistors and leaded resistors using noble metal alloy contacts (no Nickel) for MRI and CT medical imaging applications, with contact areas made by Pt-Ag and Pt-Pd-Ag alloys.
• RTD Temperature Sensors Resistance Temperature Detector sensors using precision wirewound resistors with known resistance vs. temperature relationship of metals, available in various wire alloys including Platinum, Balco and nickel.
• 100, SM, PC Series Precision Wirewound Resistors Precision axial-leaded wirewound resistors with tolerances down to 0.005%, TCR down to 1ppm/°C, and operating temperatures from -55°C to +350°C.
• Evenohm Precision Wirewound Resistors Precision wirewound resistors using Evenohm alloy formulated for low TCR of 5-10ppm/°C and thermal EMF of approximately 2µV/°C.
• UT Series High-Temperature Resistors High-temperature axial resistors operating from -55°C to 275°C (higher with derating) with TCR options down to 1ppm/°C, capable of withstanding over 1000 Joules in pulse applications.
• Ayrton-Perry Wirewound Resistors Non-inductive wirewound resistors using Ayrton-Perry winding technique with minimized parasitic inductance (<1µH for 500Ω) and capacitance (<0.8pF for 1MΩ), delivering typical rise times of 20nsec or less for pulse and high-frequency applications.
• Fuse Resistors Wire-wound resistors designed to open (stop current flow) when current exceeds fuse characteristic design limits, serving dual functions of fuse and resistor for circuit protection in power electronics.
• UHPL Series Ultra High Precision Foil Resistors Through-hole molded resistors using Bulk Metal Foil technology with tolerance of ±0.005%, TCR of ±2ppm, and load stability of ±0.005% at rated power (70°C, 2000 hours).

Quantifiable outcome

• 100% reliability with zero failures in over 4,000 units over millions of unit-hours of operation
• +2 more outcomes

Named customers5 records

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Three partnerships are on record, tiered flagship, regional and core.

• Bourns, Inc.flagshipOthers · 1 April 2023Bourns Inc., a US-based electronics manufacturer, acquired substantially all of Riedon's assets in April 2023 through its wholly owned subsidiary BE Services Company, Inc. The acquisition expanded Bourns' portfolio of thick-film, thin-film, wire-wound, and shunt resistor technologies.
• Blume Elektronik GmbHregionalChannel Partner/ Reseller/ Distributor · 11 September 2012German distributor partnership announced in September 2012. Blume Elektronik Distribution GmbH has been in the Electronic Passive Components business for 20 years, serving industrial, automotive and telecommunication industries. They provide technical support, free samples, and represent Riedon for custom designed resistors.
• Digi-KeycoreChannel Partner/ Reseller/ DistributorDigi-Key serves as a primary distribution partner for Riedon's smart shunt portfolio and standard resistor products, providing global access to customers through one of the largest electronic component distributors.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• ROHM Semiconductor: ROHM is a broad incumbent Japanese semiconductor and passive component manufacturer with a resistor portfolio spanning chip, current sense, and high-power devices. ROHM is explicitly named in Riedon's cross-reference guide and competes broadly across most resistor categories Riedon serves.

Direct peers

• Ohmcraft: Ohmcraft is a direct peer manufacturing precision thick-film resistors with high voltage, high resistance, and tight tolerance specifications. Ohmcraft competes with Riedon in medical imaging, test & measurement, and high-voltage instrumentation with comparable precision performance.
• Stackpole Electronics: Stackpole Electronics (part of SEI Electronics) is a direct peer manufacturing a broad line of resistive products including precision, current sense, and wirewound resistors. Stackpole is listed in Riedon's competitive cross-reference guide and overlaps significantly in industrial and automotive customer segments.
• Isabellenhütte: Isabellenhütte is a German direct peer specializing in precision low-ohmic resistors, shunts, and current sensing modules for automotive, industrial, and battery applications. The company's ISA-WELD and Smart Shunt-class products directly overlap with Riedon's RCS/RS shunts and SSD Smart Shunt Series.
• Caddock Electronics: Caddock Electronics is a direct peer manufacturing high-precision and power film resistors using proprietary resistance film technology. Caddock competes with Riedon in precision resistor segments for instrumentation, medical, and industrial applications with similar ultra-low tolerance and high-stability specifications.
• Vishay Precision Group: Vishay Precision Group (VPG) is a direct peer specializing in precision foil resistors and current sensing/shunt resistors, including Bulk Metal Foil technology with similar ultra-high precision positioning. VPG competes head-to-head with Riedon in medical, aerospace, and test & measurement applications.
• KOA Speer Electronics: KOA Speer Electronics is a direct peer and major global resistor manufacturer offering thick-film, thin-film, current sense, and wirewound resistors. KOA Speer is explicitly named in Riedon's cross-reference guide as a competitive source, particularly in automotive and industrial segments.
• Alpha Electronics Corp. Alpha Electronics is a Japanese direct peer manufacturing ultra-precision metal foil and thin-film resistors with TCR and tolerance specifications matching Riedon's Bulk Metal Foil portfolio. Alpha is explicitly listed in Riedon's competitive cross-reference guide as a direct substitute source.
• TT Electronics / IRC: TT Electronics (which acquired IRC) is a direct peer manufacturing precision, power, and current-sense resistors for aerospace, defense, and industrial markets. IRC's legacy wirewound and thin-film product lines directly overlap with Riedon's wirewound and precision resistor portfolios.
• State of the Art, Inc. (SOTA): State of the Art (SOTA) is a direct peer manufacturing precision thin-film and thick-film resistors for military, aerospace, and medical applications. SOTA competes with Riedon in high-reliability mil-spec and custom precision resistor segments.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xx.com/riedonresistors
• YouTubeyoutube.com/channel/UCKwQN4XTio_zYeh1Zdz4keA
• Facebookfacebook.com/Riedon
• LinkedInlinkedin.com/company/riedon-inc.

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

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

M&A1 record

Investments

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

Frequently asked questions about Riedon