The Senior Level Semiconductor High Voltage LNDMOS (Laterally Diffused N-type Metal-Oxide-Semiconductor) Device Engineer at Diodes, Inc. plays a pivotal role in the design, development, and optimization of high voltage power semiconductor devices. This person is responsible for advancing LNDMOS technology to enable reliable, efficient, and high-performance solutions for applications ranging from automotive, industrial, and consumer electronics to renewable energy systems. Focus will be on developing device and process technologies addressing voltages of 7 – 100 V with either junction or deep trench isolation. Bridging the gap between theoretical device physics and practical manufacturing, the LNDMOS Device Engineer ensures the delivery of robust products that meet stringent industry standards.
The device engineer will be part of the Diodes, Inc. worldwide technology development organization and will work with a team of industry experts designing and developing analog semiconductor process technologies for Diodes products for both internal and external production. Work location will be the Diodes, Inc. fabrication site in South Portland, Maine (USA).
Principal Duties and Responsibilities:
Device Design and Development: Lead and execute the design of high voltage LNDMOS devices, considering breakdown voltage, on-resistance, charge balance, and ruggedness. Utilize CAD and TCAD simulation tools to model electrical, thermal, and reliability characteristics, iterating designs to achieve optimal performance. Device voltages will be over 7 volts and as high as 120 volts, and devices will be isolated either by junctions or deep trenches.
Process Integration: Collaborate closely with process engineers to define and refine process flows for LNDMOS device fabrication. Evaluate and select suitable materials, doping profiles, and process steps to achieve desired device specifications, manufacturability, and yield.
Device Characterization: Plan and conduct electrical, thermal, and reliability characterization of fabricated devices. Understanding how to characterize device isolation, whether by junctions or deep trenches, is especially important. Analyze test data to validate models, extract key device parameters, and identify areas for improvement.
Technology Innovation: Research and implement new architectures, materials, and device structures (e.g., trench, RESURF, shielded gate) to push the boundaries of LNDMOS performance. Stay abreast of academic and industry advances, proposing innovative solutions for future products.
Cross-functional Collaboration: Interface with teams across device design, process engineering, test and characterization, packaging, and product engineering to ensure seamless development and launch of LNDMOS-based products.
Documentation and Reporting: Produce detailed technical documentation, including design specifications, simulation reports, process flows, and characterization results. Present findings to both technical and non-technical stakeholders.
Technical Support: Provide guidance and expertise to application engineers, field teams, and customers for integrating LNDMOS devices into end applications, troubleshooting, and ensuring optimal performance.Knowledge, Skills, and Abilities:
Education: Master’s or Doctoral degree in Electrical Engineering, Physics, Materials Science, or a related field with a focus on semiconductor devices or microelectronics.
Experience: 5-10 years of direct experience in power semiconductor device engineering, with a strong emphasis on high voltage LNDMOS or LDMOS design and fabrication. Must have worked directly designing devices with operating voltages above 30V and possibly as high as 120V. Must understand state of the art device isolation methods such as deep trench and junction guard rings. Experience with other power devices (IGBT, SiC/GaN MOSFETs) is a plus.
Technical Skills:- Proficiency in device and process simulation tools (e.g., Synopsys Sentaurus, Silvaco Atlas).
- Strong understanding of semiconductor physics, high voltage breakdown mechanisms, device isolation, and reliability phenomena.
- Hands-on experience with wafer fabrication, cleanroom protocols, and device characterization equipment.
- Knowledge of industry standards for device reliability and ruggedness.
- Experience with statistical analysis and data-driven problem solving.
- Strong analytical thinking and attention to detail.
- Excellent verbal and written communication skills for technical presentations and documentation.
- Ability to work independently and as part of cross-functional teams.
- Creative problem-solver with a passion for innovation.
- Results-driven mindset with a commitment to quality and continuous improvement.
Additional Desirable Skills:
- Publications or patents power devices or LNDMOS technology.
- Proven track record of leading device development projects from concept to mass production.
- Familiarity with automotive, industrial, or renewable energy power electronics applications.
- Experience engaging with customers and stakeholders to translate application needs into device requirements.
Pay range $143,000 to $219,000/yr. Actual compensation may vary based on experience, qualifications, skills, and geographic considerations. Incentive compensation and benefits may also be available.
Diodes Incorporated (Nasdaq: DIOD), a Standard and Poor’s SmallCap 600 and Russell 3000 Index company, is a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logic, and analog semiconductor markets. Diodes serves the consumer electronics, computing, communications, industrial, and automotive markets. Diodes, Inc. is committed to developing power electronics solutions that drive sustainability, safety, and performance. We foster a culture of creativity, integrity, and learning, empowering our teams to push boundaries and deliver excellence to our customers and partners worldwide.
We offer a competitive benefits package to include medical, dental, vision, FSA, 401k with company match, company paid Short Term and Long-Term disability and standard life insurance policy. We also provide paid time off and have an employee wellness program.
Skills Required
- Master's or doctoral degree in Electrical Engineering, Physics, Materials Science, or a related field focused on semiconductor devices or microelectronics
- 5–10 years of direct experience in power semiconductor device engineering
- Direct experience designing high-voltage LNDMOS or LDMOS devices above 30 volts, potentially up to 120 volts
- Understanding of deep-trench isolation and junction guard rings
- Proficiency with device and process simulation tools such as Synopsys Sentaurus or Silvaco Atlas
- Strong understanding of semiconductor physics, high-voltage breakdown mechanisms, device isolation, and reliability phenomena
- Hands-on experience with wafer fabrication, cleanroom protocols, and device characterization equipment
- Knowledge of industry standards for device reliability and ruggedness
- Experience with statistical analysis and data-driven problem solving
- Strong analytical, communication, documentation, collaboration, and problem-solving skills
- Experience with IGBT, SiC/GaN MOSFETs, or other power devices
- Publications or patents in power devices or LNDMOS technology
- Experience leading device development projects from concept to mass production
- Familiarity with automotive, industrial, or renewable-energy power electronics applications
- Experience translating customer application needs into device requirements
What We Do
For information about career opportunities please visit www.diodes.com/careers Diodes Incorporated is a leading global manufacturer and supplier of high-quality semiconductor products to the world’s leading companies in the consumer electronics, computing, communications, industrial, and automotive markets. We leverage our expanded product portfolio of discrete, analog, and mixed-signal products and leading-edge packaging technology to meet customers’ needs. Our broad range of application-specific solutions and solutions-focused sales, coupled with worldwide operations of 32 sites, including engineering, testing, manufacturing, and customer service, enables us to be a premier provider for high-volume, high-growth markets. Our products include diodes; rectifiers; transistors; MOSFETs; GPP bridges; GPP rectifiers; protection devices; function-specific arrays; single gate logic; amplifiers and comparators; Hall-effect and temperature sensors; power management devices, including AC-DC converters and controllers, DC-DC switching and linear voltage regulators, voltage references, and LED drivers; along with special-function devices, such as USB power switches, load switches, voltage supervisors, and motor controllers. Diodes also has timing, connectivity, switching, and signal integrity solutions for high-speed signals. Our product focus is on high-growth end-user equipment markets, such as satellite TV set-top boxes, portable DVD players, datacom devices, ADSL modems, power supplies, medical devices (non-life support devices/systems), PCs and notebooks, flat panel displays, digital cameras, mobile handsets, AC-to-DC and DC-to-DC conversion, Wireless 802.11 LAN access points, brushless DC motor fans, serial connectivity, and automotive applications. Diodes’ global corporate headquarters is located in Plano, Texas, USA. For more information visit www.Diodes.com.
