Linear Systems
Linear Systems is a privately-held, Fremont-based specialty semiconductor manufacturer founded in 1987, producing ultra-low-noise JFETs, lateral DMOS switches, and related discrete components from three Silicon Valley fabs for defense, aerospace, professional audio, medical, and scientific instrument customers.
- Company typePrivate
- Founded1987
- HeadquartersFremont, United States
- Headcount11–50
- GTM typeB2B
- OfferingHardware or Manufacturing
What Linear Systems does
Linear Integrated Systems, Inc. (doing business as Linear Systems) is a privately-held specialty semiconductor manufacturer founded in 1987 by John H. Hall and headquartered in Fremont, California. The company designs and manufactures ultra-low-noise discrete semiconductors — primarily JFETs, lateral DMOS switches, current-regulating diodes, voltage-controlled resistors, MOSFETs, bipolar transistors, and BIFET amplifiers — across three Silicon Valley fabrication facilities. Its core technological differentiator is a proprietary monolithic dual JFET construction and exclusive ownership (acquired from Vishay/Siliconix in 2001) of lateral DMOS mask sets and process technology, enabling products with 100% noise testing, ultra-low input noise (1.3-1.5 nV/√Hz), high input impedance (up to 1 TΩ), and tight device matching that integrated alternatives cannot match.
Linear Systems sells its components to engineering customers across defense and aerospace (underwater surveillance systems, space telescope cameras, military sensors, sonobuoys), professional audio (high-fidelity microphones, preamplifiers, headphone amplifiers — including AEA's 'quietest ribbon mic'), medical instrumentation (ECG, EEG, MRI, PET), scientific and test equipment, and industrial/IoT sensing applications. Its commercial model combines direct B2B sales (phone, email, quote-based) with global authorized distributor channels, complemented by custom testing and screening services that allow customers to specify precise parameters. Pricing is not publicly disclosed but historical unit prices range from $1.23 to $5.38 at 1,000-piece quantities. Marketing is technical-content driven through a blog, technical literature library, YouTube channel, and event sponsorships (Burning Amp Festival, Offshore Technology Conference).
The company has 11-50 employees, has remained privately held and founder-controlled since inception, and has professionalized its leadership team since 2024 with new VPs of Operations, Manufacturing, and a Chief Product Officer. No venture or private equity funding has been disclosed, and revenue figures are not publicly available.
Linear Systems firmographics
Firmographics- Name
- Linear Systems
- Legal name
- Linear Integrated Systems, Inc.
- Website
- https://linearsystems.com
- Company type
- Private
- Founded year
- 1987
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Linear Systems is a privately-held, Fremont-based specialty semiconductor manufacturer founded in 1987, producing ultra-low-noise JFETs, lateral DMOS switches, and related discrete components from three Silicon Valley fabs for defense, aerospace, professional audio, medical, and scientific instrument customers.
- Ownership category
- akta.pro rank
Linear Systems industry classification
Industry- Product category
- Specialty Discrete Semiconductors
- NAICS
- Semiconductor and Related Device Manufacturing (334413), Semiconductor and Other Electronic Component Manufacturing (3344)
- SIC
- Semiconductors & Related Devices (3674)
- akta.pro primary industry
- Small-Signal Transistors (BJT/JFET) (HDAHAHAI)
- akta.pro secondary industry
- Signal Diodes & Switching Diodes (HDAHAHAK)
Keywords
Where Linear Systems is headquartered
LocationHeadquarters
- HQ city
- Fremont
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Linear Systems business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Operations, Personnel, Technology or R&D, Infrastructure, Marketing or Sales
Revenue model
- Discrete Semiconductor Component Sales: Manufactures and sells specialty discrete semiconductors including JFETs, DMOS switches, bipolar transistors, MOSFETs, and related components. Revenue generated through direct sales to OEMs, distributors, and individual engineers. Products available in various package types (TO-92, SOT-23, SOIC, etc.) and die form for hybrid manufacturing.
- Custom Screening and Testing Services: Offers expanded custom testing services allowing designers to tailor product specifications to meet specific design requirements. Designers can select specific parameters across all small signal discrete products. MOQ applies to specialized services.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Unit Pricing | Pay-as-you-go | LSK489 Low-Capacitance Dual N-Channel JFET |
| Unit Pricing | Pay-as-you-go | LS26VNS/VPS Voltage-Controlled Resistors |
| Other | Multi-year contract | Custom Screening Services |
Go-to-market motion3 records
Distribution channels3 records
Marketing channels10 records
Linear Systems product offering
Product offeringCore offering
Linear Systems (Linear Integrated Systems, Inc.) manufactures specialty discrete semiconductors including ultra-low-noise monolithic dual JFETs, high-speed lateral DMOS FET switches, current-regulating diodes, voltage-controlled resistors, NPN/PNP bipolar transistors, small-signal MOSFETs, BIFET amplifiers, and low-leakage diodes. Products are fabricated at three Silicon Valley facilities and supplied in die form and standard packages (TO-92, SOT-23, SOIC) for OEM, hybrid, and end-product integration in defense, aerospace, professional audio, medical, test & measurement, and industrial sensor applications.
Product overview
Linear Systems (Linear Integrated Systems) is a specialty semiconductor manufacturer offering a comprehensive portfolio of discrete components for precision analog applications. The core product line centers on ultra-low-noise JFETs including the LSK389 (industry's lowest noise dual N-channel JFET), LSK489 (low-capacitance dual N-channel JFET), and LSJ689 (P-channel complement), alongside single JFET amplifiers like LSK170, LSBF862, and LSJ74. Complementary offerings include High-Speed Lateral DMOS Switches (SD5000 Series), Current Regulating Diodes (SST500 Series), Voltage Controlled Resistors (LS26VNS/VPS, VCR11N), Bipolar Transistors, BIFET Amplifiers, MOSFETs, and Low-Leakage Diodes. The company provides advanced custom testing and screening services for all products, and supports designs with application notes, datasheets, SPICE models, and evaluation boards like the headphone amplifier board. Products serve critical applications in defense, aerospace, professional audio, medical instrumentation, sensor systems, and scientific equipment.
Differentiator
Problem solved
Functional benefit
Brands
- Improved Standard Products: Line of improved replacement products for discontinued semiconductors from Fairchild, NXP, Siliconix-Vishay, and other manufacturers.
Products and services
- LSK389 Series Industry's lowest noise monolithic Dual N-Channel JFET with 100% noise testing, guaranteed 1/f and broadband noise specs, elimination of burst (RTN/popcorn) noise, high transconductance, and excellent matching for low-noise differential amplifier input stages.
- LSK489 Series Low-noise, low-capacitance monolithic dual N-channel JFET with 1.5 nV/√Hz noise at 1kHz, 4 pF input capacitance, tight Vgs matching, and 1000 GΩ input impedance, designed for high-impedance sensor and audio front ends without requiring cascode configuration.
- LSJ689 Ultra-low-noise P-channel dual JFET complement to the LSK489, featuring 2 nV/√Hz noise, 3 pF gate-drain capacitance, 50V breakdown voltage, and monolithic dual construction for improved matching and thermal tracking in fully complementary input stages.
- LSK170 Series Ultra-low-noise single N-channel JFET designed as a direct replacement for the Toshiba 2SK170, targeting ultra-low-noise audio, acoustic, and high-input-impedance instrumentation applications.
- LSBF862 Ultra-low-noise N-channel JFET amplifier that serves as an improved replacement for the discontinued NXP BF862, with superior noise characteristics, -40V gate-source breakdown voltage, and selectable testing and screening options.
- SD5000 Series Quad high-speed N-channel lateral DMOS FET switch with Zener diode protection, ultrafast switching speeds (tr=1ns, tOFF=3ns), and low parasitic capacitances for wideband signal handling with high off-isolation and minimum crosstalk.
- SD/SST210 Series Single high-speed N-channel lateral DMOS FET switch for video, fast ATE, telecom, and analog switching applications, part of the Siliconix-acquired DMOS product line with 1ns switching capability.
- SST500 Series Current Regulating Diodes with tight tolerances and wide current range, direct replacement for the Siliconix-Vishay SST500 Series, targeting test instrumentation and medical applications.
- LS26VNS / LS26VPS Voltage-Controlled Resistors N-channel and P-channel JFET voltage-controlled resistors whose drain-source resistance is controlled by DC bias voltage, used in variable gain amplifiers, automatic gain controls, voltage-controlled oscillators, and filter range controls.
- 3N163 PMOS MOSFET (RADFET) Small-signal P-channel MOSFET that can function as a RADFET (radiation-sensitive field-effect transistor) for radiation detection, capable of operating without continuous power and retaining exposure information as non-volatile analog memory.
- Custom Testing & Screening Services Advanced screening and customization services allowing precise parameter selection across the full product range including JFETs, MOSFETs, bipolar transistors, current regulators, and diodes, with custom sorting options and tighter tolerances than standard datasheet specifications.
- Headphone Amplifier Evaluation Board Complete stereo headphone amplifier evaluation board featuring 400 mW output power into 100Ω, 10Hz-200kHz frequency response, low distortion, short-circuit protection, and volume control, using Linear Systems JFETs to demonstrate component performance to engineering buyers.
Quantifiable outcome
- Input noise as low as 1.3 nV/√Hz at 1 kHz and 1.5 nV/√Hz at 10 Hz in LSK389
- +6 more outcomes
Companies that use Linear Systems
Customer profileNamed customers3 records
Segments5 records
Ideal customer profiles5 records
Linear Systems technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature8 records
Linear Systems partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- Rattle TechcoreStrategic partnership announced in April 2026 for public sector technology expansion. Linear Systems' components are part of Rattle Tech's expanded public sector technology portfolio delivering cloud-based solutions including digital evidence management, citizen engagement tools, and AI-powered chatbot automation for 24/7 government support. The collaboration positions Linear Systems as a component supplier enabling modernization of legacy systems for government agencies and law enforcement.
Scale indicators7 records
Recent moves6 records
Expansion highlights5 records
Linear Systems competitors and assessment
Company assessmentBroad incumbents
- Diodes Incorporated: Manufacturer of discrete, analog, and mixed-signal semiconductors with extensive small-signal transistor and diode lines. Competes with Linear Systems in cost-sensitive sockets where integrated volume players dominate.
- NXP Semiconductors: Global semiconductor incumbent whose discontinued BF862 JFET is directly replaced by Linear Systems' LSBF862. NXP's broad analog portfolio overlaps with Linear Systems in automotive, industrial, and consumer sockets.
- ON Semiconductor (onsemi): Broad analog and power semiconductor manufacturer with a large small-signal discrete portfolio. Competes with Linear Systems in low-noise and small-signal transistor sockets across industrial and consumer markets.
- Renesas Electronics: Acquired Intersil (co-founded by Linear Systems founder John H. Hall) and offers broad analog and discrete portfolios. Renesas is a direct line-extension competitor in precision analog and serves the same defense, industrial, and instrumentation end markets.
- Toshiba Electronic Devices & Storage: Japanese semiconductor incumbent whose discontinued 2SK170 JFET is directly replaced by Linear Systems' LSK170. Toshiba's broader small-signal discrete portfolio overlaps with Linear Systems in audio and instrumentation applications.
- Vishay Intertechnology: One of the world's largest discrete semiconductor manufacturers. Vishay is the predecessor owner of Siliconix (DMOS process acquired by Linear Systems in 2001) and competes broadly across small-signal discretes, MOSFETs, and diodes that overlap with Linear Systems' portfolio.
- Microchip Technology: Diversified analog and microcontroller supplier with small-signal discrete offerings through its Micrel and Microsemi acquisitions. Competes with Linear Systems in instrumentation, defense, and industrial applications.
Direct peers
- Calogic: Specialty manufacturer of JFETs, MOSFETs, and analog ICs focused on precision low-noise and high-performance discrete components. Closely comparable to Linear Systems in JFET focus and target customer profile of precision analog designers.
- Sensitron Semiconductor: Specialty discrete semiconductor manufacturer producing small-signal transistors, diodes, and MOSFETs for defense, aerospace, medical, and industrial markets. Direct peer in niche specialty discrete focus and qualified-customer orientation.
- Central Semiconductor: US-based specialty manufacturer of small-signal discrete semiconductors including transistors, diodes, MOSFETs, and JFETs. Closely comparable to Linear Systems in product mix, niche specialty focus, and target customer base of design engineers and OEMs.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat4 records
Key risks6 records
Key highlights7 records
Customer concentration
Linear Systems social profiles
Digital presenceLinear Systems financial estimates
Financial estimateRevenue estimate
Valuation estimate
Linear Systems leadership team
Management profileNumber of profiles
Profiles8 records
Linear Systems funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Linear Systems M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Linear Systems
What does Linear Systems do?
Linear Systems (Linear Integrated Systems, Inc.) manufactures specialty discrete semiconductors including ultra-low-noise monolithic dual JFETs, high-speed lateral DMOS FET switches, current-regulating diodes, voltage-controlled resistors, NPN/PNP bipolar transistors, small-signal MOSFETs, BIFET amplifiers, and low-leakage diodes. Products are fabricated at three Silicon Valley facilities and supplied in die form and standard packages (TO-92, SOT-23, SOIC) for OEM, hybrid, and end-product integration in defense, aerospace, professional audio, medical, test & measurement, and industrial sensor applications.
Is Linear Systems a public or private company?
Linear Systems is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Linear Systems founded?
Linear Systems was founded in 1987. It employs 11 to 50 people.
Where is Linear Systems based?
Linear Systems is headquartered in Fremont, United States, in the North America region.
How does Linear Systems make money?
Two revenue lines are on record. Discrete Semiconductor Component Sales are the primary driver. The others are custom Screening and Testing Services.
Who are Linear Systems's main competitors?
Broad incumbents on record are Diodes Incorporated, NXP Semiconductors, ON Semiconductor (onsemi), Renesas Electronics, Toshiba Electronic Devices & Storage, Vishay Intertechnology and Microchip Technology. Direct peers are Calogic, Sensitron Semiconductor and Central Semiconductor.
Does Linear Systems have an API?
No public API is recorded for Linear Systems.
What industry is Linear Systems in?
Linear Systems's product category is Specialty Discrete Semiconductors. Its primary akta.pro industry code is HDAHAHAI, Small-Signal Transistors (BJT/JFET), with a secondary code of HDAHAHAK, Signal Diodes & Switching Diodes. Its NAICS code is 334413 and its SIC code is 3674.