What Ametherm does

Ametherm, Inc. is a US-based manufacturer of NTC (Negative Temperature Coefficient) and PTC (Positive Temperature Coefficient) thermistor components, organized into two product lines: Inrush Current Limiters and Sensing Thermistors. The company designs and produces thermistors from specially-formulated metal oxide ceramic materials, delivering discrete components that protect electrical equipment from surge current at power-on and provide temperature sensing, measurement, compensation, and control. Product families span multiple form factors and ratings — including MS35 and MM35-DIN series for high-power industrial applications (up to 1200J input energy and 80A steady-state current), ACCU-CURVE interchangeable precision thermistors (±0.2°C accuracy), surface-mount SM08/SM06/SM04 series, and the dual-function ThermiVolt NTC probe — all manufactured in Carson City, Nevada, and qualified to UL, CSA, ISO 9001:2015, RoHS, REACH, and Dodd-Frank 3TG standards.

The company serves industrial manufacturing (motors, transformers, power supplies, wind/solar inverters), automotive and EV battery management, medical equipment, and consumer/appliance electronics. Ametherm operates a hybrid go-to-market combining direct factory sales for custom specifications and large-volume orders with authorized global distribution through Digi-Key Electronics and Mouser Electronics for SMB and prototyping volume. Marketing is technical-content driven — an extensive engineering blog, application notes, online selection calculators, free sample programs, and APEC conference participation — designed to drive pull-through demand from design engineers. The company was acquired by Vishay Intertechnology, Inc. (NYSE: VSH) on June 6, 2024, integrating Ametherm's portfolio into one of the world's largest manufacturers of discrete semiconductors and passive electronic components.

Name

Ametherm

Legal name

Ametherm, Inc.

Website

https://ametherm.com

Company type

Private

Founded year

1994

Operating status

Acquired

Headcount range

101–250 employees

Short description

Ametherm manufactures NTC and PTC thermistor components — inrush current limiters and temperature sensors — for industrial, automotive/EV, medical, and appliance customers from its Carson City, Nevada facility, distributing globally via Digi-Key, Mouser, and direct sales, and now operating as a Vishay Intertechnology subsidiary following its June 2024 acquisition.

Ownership category

akta.pro rank

Product category

Passive Electronic Components (Thermistors)

NAICS

Capacitor, Resistor, Coil, Transformer, and Other Inductor Manufacturing (334416)

SIC

Electronic Components & Accessories (3670)

akta.pro primary industry

Thermistors & Temperature Sensors (NTC/PTC/RTD Elements) (HDAHANAH)

Keywords

• Inrush current limiters
• NTC thermistors
• PTC thermistors
• Temperature sensing components
• Circuit protection devices

Headquarters

HQ city

Carson City

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Thermistor Component Sales: Direct sales of NTC and PTC thermistors, inrush current limiters, and temperature sensor probes to industrial customers through distribution partners and direct requests. Products are sold as discrete components with various specifications for different applications.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels6 records

Core offering

Ametherm designs and manufactures NTC and PTC thermistor-based components used for inrush current limiting and temperature sensing in electrical and electronic circuits. Products are built from specially-formulated metal oxide ceramic materials in Carson City, Nevada (USA) and are sold as discrete catalog components (across multiple series such as MS35, MM35-DIN, MegaSurge, miniAMP, bigAMP, ACCU-CURVE and ThermiVolt) to industrial, automotive/EV, medical, and consumer electronics OEMs. The offering spans miniature surface-mount devices to DIN-rail-mountable high-power units rated up to 1200J input energy and 80A steady-state current.

Product overview

Ametherm is a manufacturer of NTC (Negative Temperature Coefficient) and PTC (Positive Temperature Coefficient) thermistor-based products organized into two core product lines: Inrush Current Limiters and Sensing Thermistors. The Inrush Current Limiters product line includes multiple series (Standard Surge, MS35, AS Series, MegaSurge, PTC, MM35-DIN, miniAMP, bigAMP, RTI Surge Gard, MCL20) designed to protect electrical equipment from surge current damage at power-on across applications from consumer electronics to industrial machinery. The Sensing Thermistors product line encompasses various probe assemblies (ThermiVolt, Ring Lug, Threaded Hex Nut, Epoxy, Steel Housing, Glass Encapsulated DG Series), surface mount devices (SM08/SM06/SM04, End Band), and specialized sensors (ACCU-CURVE interchangeable, Disc and Chip, PANR series) for temperature sensing, measurement, compensation, and control in medical, industrial, automotive, and consumer applications. Both product lines are manufactured in Carson City, Nevada, USA.

Differentiator

Problem solved

Functional benefit

Brands

• ACCU-CURVE: Series of interchangeable NTC thermistors used for high-accuracy temperature sensing, control, and compensation in medical, industrial, and automotive applications.
• MegaSurge
• miniAMP
• bigAMP
• ThermiVolt
• RTI Surge Gard

Products and services

• Inrush Current Limiters NTC and PTC thermistor-based inrush current limiters for protecting transformers, motors, power supplies, inverters, and other inductive loads from damaging surge currents at switch-on. For industrial, automotive, renewable energy, and consumer electronics OEMs.
• NTC Sensing Thermistors NTC thermistor temperature sensors for accurate temperature sensing, measurement, compensation, and control across industrial, medical, automotive, and consumer applications.
• RTI / Ametek-Rodan / Ketema-Rodan Legacy Thermistor Sensors Legacy thermistor sensor product lines carried over from acquired brands RTI, Ametek-Rodan, and Ketema-Rodan, supplied to existing customers for continuity in established applications.

Quantifiable outcome

• MS35 series withstands 500J to 750J input energy and 10A to 50A steady-state currents
• +2 more outcomes

Segments4 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

One partnership is on record.

• Vishay IntertechnologycoreOthers · 6 June 2024Vishay Intertechnology, one of the world's largest manufacturers of discrete semiconductors and passive electronic components, acquired Ametherm in June 2024. This acquisition expands Vishay's resistor product portfolio to include Ametherm's inrush current limiting thermistors and temperature sensors.

Scale indicators2 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• Murata Manufacturing: Largest global passive-components manufacturer with broad NTC thermistor and temperature-sensor product lines. Competes with Ametherm in surface-mount and probe thermistors across automotive and industrial segments.
• Vishay Intertechnology: Parent company of Ametherm since June 2024 and one of the world's largest manufacturers of discrete semiconductors and passive components, including its own NTC/PTC thermistor lines. Most direct line-of-sight competitor plus acquirer.
• STMicroelectronics: Major semiconductor company with analog temperature-sensor ICs and embedded NTC interface products targeting industrial and automotive markets. Competes with Ametherm at the system level for temperature-monitoring design wins.
• TE Connectivity: Global connectivity and sensor manufacturer with temperature-sensor products including NTC thermistor probes for industrial, automotive, and medical applications. Overlaps Ametherm's probe-assembly business.
• Honeywell Sensing & Productivity Solutions: Industrial conglomerate's sensor division offering thermistors, RTDs, and temperature probes for HVAC, medical, and industrial customers. Significant overlap with Ametherm's sensing business at scale.
• TDK (EPCOS): Global passive-components giant offering NTC/PTC thermistors, inrush current limiters, and temperature sensors through its EPCOS brand. Much broader portfolio than Ametherm but competes in the same discrete thermistor categories.

Direct peers

• Littelfuse: Major circuit-protection specialist with PTC thermistor offerings and competing inrush current limiter solutions for power electronics, motor drives, and industrial power systems. Overlaps with Ametherm's inrush current limiter lines.
• Shibaura Electronics: Specialist manufacturer of NTC thermistors for industrial, automotive, and home appliance applications. Comparable niche focus on thermistor-based sensing and inrush current limiting components.
• Amphenol Advanced Sensors (Thermometrics): Subsidiary of Amphenol producing NTC thermistors, probe assemblies, and temperature sensors for automotive, medical, and industrial markets. Directly competes with Ametherm's sensing thermistor portfolio across form factors and accuracy classes.
• Semitec Corporation: Japanese pure-play NTC thermistor manufacturer focused on temperature sensing and inrush current limiting. Closest direct competitor to Ametherm in size, product scope, and target applications including automotive, industrial, and medical.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xx.com/Ametherm

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

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 Ametherm