Littelfuse

Circuit Protection and Power Control Componentslittelfuse.com

Company typePublic
Founded1927
HeadquartersChicago, United States
Headcount5,001–10,000
GTM typeB2B
OfferingHardware or Manufacturing

Littelfuse firmographics

Firmographics

Name: Littelfuse
Legal name: Littelfuse, Inc.
Website: https://littelfuse.com
Company type: Public
Founded year: 1927
Operating status: Operating
Headcount range: 5,001–10,000 employees
Ownership category
akta.pro rank

Littelfuse industry classification

Industry

Product category: Circuit Protection and Power Control Components
NAICS: Electrical Equipment Manufacturing (33531), Relay and Industrial Control Manufacturing (335314), Wiring Device Manufacturing (33593)
SIC: Electronic & Other Electrical Equipment (No Computer Equip) (3600), Semiconductors & Related Devices (3674), Industrial Instruments For Measurement, Display, And Control (3823)
akta.pro primary industry: Varistors & Surge Protection (MOV/TVS-like passive protectors/GDT) (HDAHANAI)
akta.pro secondary industries: Power Modules (IGBT/MOSFET/SiC/GaN Modules) (HDAHAHAH), Industrial Safety & Security Electronics Manufacturing (Safety relays, E-stops, light curtains, access control) (IMAGAGAG)

Keywords

Circuit protection components
Power semiconductors
Electrical fuses
Protection relays
Automotive TVS diodes

Where Littelfuse is headquartered

Location

Headquarters

HQ city: Chicago
HQ country: United States
HQ region: North America

Offices5 records

Markets served

Littelfuse business model

Business model

GTM type: B2B
Offering type: Hardware or Manufacturing
Cost components: Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

Electronic Components Sales: Littelfuse generates revenue through the design, manufacture, and sale of electronic components including circuit protection devices, fuses, semiconductors, sensors, switches, and protection relays. Products are sold to industrial, transportation, and electronics end markets through distributor networks.
Distribution Services: The company serves as a distributor of its own products and also receives distribution services from partners like Mouser Electronics for global market access.

Pricing tiers

Model	Billing	Price
Other	Multi-year contract	B2B component sales through authorized distributors

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Littelfuse product offering

Product offering

Core offering

Littelfuse designs, manufactures, and sells electronic components for circuit protection, power control, and sensing across industrial, transportation, and electronics end markets. Its product portfolio spans fuses, TVS diodes, metal oxide varistors, gas discharge tubes, surge protective devices, MOSFETs (Si/SiC), IGBTs, gate drivers, magnetic and temperature sensors, electromechanical switches, ground fault and arc flash protection relays, solid state relays, and aerospace/defense connectors. Products are sold to OEM customers globally via authorized distributor networks and the company's own e-commerce platform.

Product overview

Littelfuse is a diversified industrial technology manufacturing company offering a comprehensive portfolio of circuit protection, power control, and sensing solutions. The product portfolio centers on five core technology areas: (1) Circuit Protection Products including fuses, TVS diodes, MOVs, GDTs, and SPDs for overcurrent and overvoltage protection; (2) Power Semiconductors including MOSFETs (Si/SiC), IGBTs, and gate drivers for power conversion; (3) Sensors including TMR magnetic switches, temperature sensors (NTC), and speed sensors; (4) Switches including tactile, DIP, and load switches; and (5) Protection Relays including GFCIs and arc flash relays. Additionally, Littelfuse offers Solid State Relays and Aerospace & Defense Connectors (D-Sub, Micro D, MTB1) with ESCC/MIL certifications. Notable product lines include the SB4000 Industrial Shock Block GFCI for personnel protection, FlatSuppressX TVS diode series for automotive load-dump protection, TMR Magnetic Switch Series for position sensing, and the MMIX1T500N20X4 power MOSFET for high-power density applications. The company serves industrial, transportation, electronics, power generation, data center, and aerospace & defense end markets.

Differentiator

Problem solved

Functional benefit

Brands

C&K Switches: Electromechanical switches brand acquired by Littelfuse in 2022, including D-Sub connectors, Micro D connectors, and SpaceSplice connectors for aerospace and defense applications.
SpaceSplice
AeroSplice
PolySwitch
FlatSuppressX
DBMA Savers

Products and services

Circuit Protection Products

Quantifiable outcome

Q2 2026 revenue growth of 20% year-over-year to $739 million
+4 more outcomes

Companies that use Littelfuse

Customer profile

Named customers4 records

Segments5 records

Ideal customer profiles4 records

Littelfuse technology and API

Technology

Technology focussed Yes

API detail

Has API: No
API docs
API detail

Core technology

AI maturity

App detail

Feature6 records

Littelfuse partnerships and signals

Strategic signal

Partnerships

Four partnerships are on record, tiered minor and core.

JREP/Kanematsu CorporationminorChannel Partner/ Reseller/ Distributor · 1 January 2026JREP, a subsidiary of Kanematsu Corporation, exhibits Littelfuse products including power semiconductors, heat management solutions, and components at TECHNO-FRONTIER 2026 in Tokyo, Japan.
Analog Devices, Amphenol, Molex, Phoenix Contact, Samtec, Silicon Labs, TE Connectivity, TAIYO YUDENminorChannel Partner/ Reseller/ Distributor · 1 January 2026Littelfuse participates alongside these major component suppliers in Mouser India's Technical Roadshow 2026 covering automotive/EV ecosystems, AI hardware, and smart manufacturing across three Indian cities.
Premier FarnellminorChannel Partner/ Reseller/ Distributor · 1 January 2026Premier Farnell partnership for circuit protection product distribution in Indian markets as part of Littelfuse's regional distribution strategy.
Mouser ElectronicscoreChannel Partner/ Reseller/ Distributor · 1 January 2025Mouser Electronics is Littelfuse's authorized global distributor, receiving the 2025 Global High Service Distributor of the Year award for exceptional customer service, product breadth, digital engagement, and global accessibility. Mouser distributes to over 650,000 customers in 223 countries.

Scale indicators17 records

Recent moves6 records

Expansion highlights6 records

Littelfuse competitors and assessment

Company assessment

Direct peers

Sensata Technologies: Sensata is a direct peer to Littelfuse in circuit protection, sensors, and automotive/industrial electronic components. Both companies serve transportation and industrial end markets with overlapping portfolios in fuses, sensors, and protection relays, and compete head-to-head for similar OEM customers.
Bourns: Bourns is a direct peer in circuit protection, specializing in resistive products, circuit protection devices, and magnetic components for automotive, industrial, and consumer markets. The companies compete directly in overcurrent/overvoltage protection across multiple end segments.
Bel Fuse: Bel Fuse is a direct peer in circuit protection, magnetics, and power conversion products serving industrial, telecommunications, and military/aerospace markets. The companies overlap meaningfully in fuse products and power solutions for similar end customers.

Broad incumbents

Eaton: Eaton is a broad incumbent in electrical and industrial power management, including circuit protection, power distribution, and industrial controls. While much larger and more diversified than Littelfuse, Eaton overlaps in electrical protection and competes for similar industrial customers.
Vishay Intertechnology: Vishay is a broad incumbent in discrete semiconductors and passive components, including MOSFETs, diodes, and resistors — directly overlapping Littelfuse's power semiconductor and circuit protection portfolios. Both serve industrial, automotive, and military/aerospace end markets.
TE Connectivity: TE Connectivity is a broad incumbent in connectors and sensors, including the recently acquired Aerospace & Defense connector business area where Littelfuse/C&K competes. Both serve transportation, industrial, and aerospace/defense markets with overlapping product portfolios.
ON Semiconductor: ON Semiconductor is a broad incumbent in power semiconductors (MOSFETs, IGBTs, SiC) directly competing with Littelfuse's power semiconductor portfolio in EV, renewable, and industrial applications. Both companies target similar high-growth electrification end markets.
Infineon Technologies: Infineon is a broad incumbent and global leader in power semiconductors, automotive electronics, and industrial power solutions. It competes directly with Littelfuse in MOSFETs, IGBTs, and protection products serving the same automotive/industrial end customers.
Diodes Incorporated: Diodes Incorporated is a broad incumbent in discrete semiconductor products, including protection devices and power management ICs that overlap with Littelfuse's discrete and power semiconductor lines, serving similar automotive, industrial, and consumer customers.
Amphenol: Amphenol is a broad incumbent in interconnect, antenna, and sensor solutions, including aerospace/defense products that directly compete with Littelfuse/C&K's connector portfolio. Both serve military, aerospace, industrial, and automotive end markets with high-reliability connector solutions.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

Littelfuse compliance and trust

Trust signal

Compliance10 records

Littelfuse financial estimates

Financial estimate

Revenue estimate

Valuation estimate

Littelfuse leadership team

Management profile

Number of profiles

Profiles10 records

Littelfuse subsidiaries and ownership

Company hierarchy

Subsidiaries7 records

Littelfuse funding detail

Funding detail

Funding overview

Funding rounds

Investors

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

Littelfuse M&A and investment

M&A and investment

M&A29 records

Investments4 records

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

Frequently asked questions about Littelfuse

What does Littelfuse do?

Is Littelfuse a public or private company?

Littelfuse is a public company. It is classified as public and is currently operating.

When was Littelfuse founded?

Littelfuse was founded in 1927. It employs 5,001 to 10,000 people.

Where is Littelfuse based?

Littelfuse is headquartered in Chicago, United States, in the North America region.

How does Littelfuse make money?

Two revenue lines are on record. Electronic Components Sales are the primary driver. The others are distribution Services.

Who are Littelfuse's main competitors?

Direct peers on record are Sensata Technologies, Bourns and Bel Fuse. Broad incumbents are Eaton, Vishay Intertechnology, TE Connectivity, ON Semiconductor, Infineon Technologies, Diodes Incorporated and Amphenol.

Does Littelfuse have an API?

No public API is recorded for Littelfuse.

What industry is Littelfuse in?

Littelfuse's product category is Circuit Protection and Power Control Components. Its primary akta.pro industry code is HDAHANAI, Varistors & Surge Protection (MOV/TVS-like passive protectors/GDT), with a secondary code of HDAHAHAH, Power Modules (IGBT/MOSFET/SiC/GaN Modules). Its NAICS code is 33531 and its SIC code is 3600.