HoTo263A Series – High-Power Thick-Film Resistors with Wide Resistance Range

author: Milliohm Electronics

2026-07-30

Milliohm Electronics' HoTo263A Series – The High-Power Resistor Solution You Can Trust

Drawing on over a decade of experience in the passive components industry, Milliohm Electronics—a nationally certified High-Tech Enterprise—has independently developed the HoTo263A power thick-film resistor series. Key advantages include:

High power handling for demanding applications
Non-inductive design for high-frequency performance
Wide resistance range for flexible design-in
Easy mounting for streamlined assembly

Manufactured to international standards and backed by multiple authoritative certifications, the HoTo263A series delivers a reliable, cost-effective alternative to imported power resistors—empowering equipment upgrades and contributing to the advancement of high-quality industrial development across sectors.

I. Enterprise Strength – Precision Engineering That Defines a National Brand

Shenzhen Milliohm Electronics Co., Ltd. is a state-certified High-Tech Enterprise dedicated to the research, development, and production of resistors, shunts, and other passive components. Since our founding in 2009, we have pursued a clear and consistent vision: innovation at our core, quality as our foundation. With more than a decade of focused expertise in the resistor industry, we have built a fully integrated operational framework that spans R&D, manufacturing, sales, and customer support. From our headquarters in Shenzhen, we operate four manufacturing sites in Anhui, Foshan, Zhongshan, and Danyang, alongside eight sales offices across the country. Our 30,000 m² production footprint and team of over 400 employees enable us to deliver high-volume production with unwavering quality consistency.

We operate in full compliance with international standards, having secured IATF 16949 and ISO 9001 system certifications, with all products meeting RoHS and REACH environmental requirements—ensuring full regulatory compliance for even the most demanding industry applications. Through our proprietary process technologies, advanced manufacturing equipment, and experienced R&D personnel, Milliohm Electronics continues to develop high-performance components that precisely address market demands. The HoTo263A power thick-film resistor series is a prime example of our technical capabilities and commitment to engineering excellence—designed to solve the critical pain points of high-power, high-frequency applications, and trusted by customers across industries for its outstanding performance.

II. Core Product – HoTo263A Power Thick-Film Resistor: The Preferred Choice for High-Power Applications

The HoTo263A power thick-film resistor is purpose-engineered for high-power, high-frequency applications. Housed in a standard TO‑263 package and incorporating a non-inductive design philosophy, the series delivers an optimal balance of high power handling capability and precision electrical performance. With a broad resistance range and user-friendly mounting features, the HoTo263A series readily adapts to the demanding operating conditions encountered across industrial and electronic applications—making it an essential component for power supply modules, variable frequency drives, high-frequency equipment, and related systems.

① Key Features – Engineered to Overcome Industry Challenges

① -1： High Power Handling – Engineered for Demanding Load Conditions

The HoTo263A series offers a rated power of up to 35 W with an appropriate heatsink (2.5 W without heatsink), with a thermal resistance as low as 4.5°C/W, ensuring excellent heat dissipation efficiency and stable operation under high load conditions. It effectively performs critical circuit functions including current limiting, voltage division, and energy buffering. By minimizing the need for frequent component replacement, it substantially reduces equipment maintenance costs and extends service life.

①-2： Non-Inductive Design – Optimized for High-Frequency Applications

Employing a professional non-inductive structural design, the series effectively suppresses parasitic inductance, mitigating circuit oscillation and signal distortion in high-frequency operation. This ensures stable resistor performance in high-frequency environments, making it ideally suited for a wide range of high-frequency equipment and precision circuits while enhancing overall system efficiency.

①-3： Wide Resistance Range – Flexible and Convenient Selection

Covering a resistance range from 0.1 R to 1 MR, the series encompasses low, medium, and high resistance values, enabling flexible selection based on specific application requirements without the need for custom designs. This significantly streamlines the component selection process and accommodates diverse application needs.

①-4： TO‑263 Standard Package – Efficient and Convenient Mounting

The HoTo263A series is housed in the industry-standard TO‑263 package, featuring standardized dimensions and excellent consistency. Coupled with recommended pad layouts, it seamlessly integrates with automated pick-and-place and soldering processes, significantly improving production efficiency while facilitating convenient maintenance and replacement. The series is fully compatible with standardized PCB designs.

①-5： Superior Stability and Reliability – Proven Through Rigorous Testing

The series has undergone comprehensive qualification testing, including short-time overload, rapid temperature cycling, climatic sequence, damp heat steady-state, and endurance (load life) tests. All tests are conducted in compliance with GB/T 5729-2003 and IEC 60115-1:2001 standards, with resistance change limits strictly controlled within specified tolerances. The HoTo263A series delivers stable long-term performance and reliably withstands demanding operating conditions.

①-6： Multiple Precision Options – Tailored to Diverse Requirements

The series is available in tolerance grades of ±0.5%, ±1%, ±5%, and ±10%. Temperature Coefficient of Resistance (TCR) is offered in four ranges—±50 ppm/°C, ±100 ppm/°C, ±250 ppm/°C, and ±500 ppm/°C—depending on the resistance value range. This flexibility allows customers to select the optimal balance between precision and cost-effectiveness for their specific application needs.

② Key Specifications – Engineered for Application Excellence

② -1: Electrical Specifications (at 25°C Ambient)

Parameter	Value / Range
Rated Power (with heatsink)	35 W
Rated Power (without heatsink)	2.5 W
Thermal Resistance	4.5°C/W
Resistance Range	0.1 R ~ 1 MR
Maximum Operating Voltage	350 V
Dielectric Withstanding Voltage	1800 VAC
Operating Temperature Range	–55°C to +175°C
Climatic Category (IEC 60068-1)	55/175/56

Resistance Range – Tolerance – TCR Matrix:

Resistance Range	Tolerance	TCR
0.1 R ~ 1 R	±5%, ±10%	±500 ppm/°C
1 R ~ 10 R	±5%, ±10%	±250 ppm/°C
10 R ~ 1 MR	±0.5%, ±1%, ±5%, ±10%	±50 ppm/°C, ±100 ppm/°C

② -2: Dimensions and Pad Layout

Mechanical Dimensions (mm):

W	E	A	D	H	H1	L	L1	B	C	P
5.08±0.25	1.3±0.1	0.8±0.06	10±0.2	8.8±0.2	4.9±0.1	4.5±0.4	1.25±0.1	1.5±0.5	1.5±0.5	0.6±0.05

Recommended Pad Layout (mm):

a	b	c	d	e	f	h	k
1.2	8.6	4.02	11	4	2.49	6.5	2.4

Optimized for automated soldering processes to ensure reliable solder joints.

② -3: Ordering Information

Part Number Structure: HoTo-263A[Power][Resistance][Tolerance Code][TCR Code]

Example: HoTo-263A35W25RJE = 35 W, 25 Ω, ±5%, ±100 ppm/°C

Code	Tolerance	Code	TCR
D	±0.5%	D	±50 ppm/°C
F	±1%	E	±100 ppm/°C
J	±5%	H	±250 ppm/°C
K	±10%	K	±500 ppm/°C

② -4: Customization Services

Customized specifications are available upon request. Milliohm Electronics offers flexible adjustments to power rating, tolerance, TCR, and other key parameters to meet unique application requirements. Please contact our sales team for detailed customization inquiries.

III. Application Scenarios – Enabling Diverse Industries and Unlocking New Possibilities in High-Power Applications

Leveraging its core strengths—high power handling, non-inductive design, wide resistance range, and exceptional stability—the HoTo263A power thick-film resistor series offers broad adaptability across industrial, electronics, power, and other sectors, delivering reliable component-level support for a wide variety of equipment. Key application scenarios include:

① Power Supply Modules

The HoTo263A series is deployed in a wide range of power supply equipment, including high-power power supply modules, switching power supplies, and UPS systems, where it performs critical circuit functions such as current limiting, voltage division, and energy buffering. With a rated power of 35 W, the series readily accommodates the high-load demands of power modules, while its non-inductive design effectively mitigates signal interference in high-frequency operation. The wide operating temperature range ensures stable performance under the complex thermal conditions typical of power supply environments, guaranteeing consistent output and extending the service life of power modules.

② Industrial Controls

The HoTo263A series is well-suited for industrial variable frequency drives (VFDs), automation control systems, and servo drives, where it is used for current sensing, current limiting protection, and energy absorption. Its exceptional stability and minimal resistance drift ensure precise and reliable equipment control, preventing system failures caused by resistor performance fluctuations and thereby improving production efficiency and product yield. The industry-standard TO‑263 package is fully compatible with automated assembly processes, significantly enhancing manufacturing productivity.

③ High-Frequency Equipment

Leveraging its non-inductive design advantage, the HoTo263A series is widely deployed in high-frequency equipment and RF circuits, where it effectively suppresses circuit oscillation and signal distortion caused by inductive parasitic effects. This ensures stable high-frequency signal transmission and enhances the precision and efficiency of equipment operation, meeting the stringent performance requirements of high-frequency applications.

④ Emerging and Extended Applications

Backed by its proven reliability, wide resistance range, and full environmental compliance (RoHS/REACH), the HoTo263A series can be extended to emerging applications including new energy systems, industrial instrumentation, and high-voltage equipment. It satisfies the demanding requirements of high-power, high-stability scenarios across these sectors, empowering equipment upgrades and contributing to enhanced productivity and quality across industries.

IV. Core Advantages – Choosing Milliohm Means Choosing Peace of Mind

① Quality Assurance – A True Alternative to Imported Equivalents

The HoTo263A power thick-film resistor series is manufactured in strict compliance with IATF 16949 and ISO 9001 quality management system standards. Having passed a comprehensive suite of rigorous performance tests, all key parameters are validated to meet or exceed international standards, making the series a fully qualified alternative to imported equivalents. With superior cost-effectiveness, it enables customers to achieve significant cost reductions while maintaining uncompromising quality—delivering tangible value through cost optimization and efficiency gains.

② Ample Production Capacity – Efficient and Reliable Delivery

With four manufacturing facilities operating in parallel at scale, Milliohm Electronics maintains substantial production capacity reserves to respond swiftly to high-volume customer orders, ensuring on-time delivery and preventing production delays caused by supply chain interruptions. A well-established inventory management system further supports emergency procurement needs, enhancing operational efficiency and strengthening supply chain resilience.

③ Technical Support – Responsive and Customer-Centric Service

Our dedicated R&D team offers extended customization services, tailoring key parameters to meet specific customer requirements. Backed by dedicated FAE (Field Application Engineering) and account management teams, we provide comprehensive support through an integrated online-and-offline service model—including technical consultation, component selection guidance, and after-sales support. Our rapid-response approach ensures that customer concerns are addressed promptly and effectively.

④ Full Regulatory Compliance – Risk-Free Procurement and Deployment

Milliohm Electronics and its products have obtained multiple authoritative certifications and fully comply with RoHS, REACH, and other environmental directives, making them suitable for a broad range of compliance-sensitive applications. All product performance attributes have been validated through national and international standard testing, ensuring a solid foundation of reliability that customers can trust.

V. Partnership for the Future – Collaborating with Milliohm for Shared Success

Milliohm Electronics remains steadfast in its corporate philosophy—"Precision Engineering, Powering the Future"—guided by technological innovation as our core driver, quality assurance as our foundation, and customer needs as our compass. We are continuously refining the HoTo263A power thick-film resistor series, enhancing both performance and cost-effectiveness to deliver superior, more competitive component solutions to customers across industries.

Today, Milliohm Electronics' products are widely deployed across power supplies, industrial controls, high-frequency equipment, and other sectors. Through consistent quality and dedicated service, we have earned broad recognition from industry customers and established long-term, stable partnerships with numerous industry leaders.

We cordially invite partners from all industries to join us in leveraging our product advantages, technical capabilities, and service commitment to drive equipment upgrades and industrial innovation—achieving mutual benefit and shared growth.