English
A ceramic resistor is a versatile component that combines a ceramic housing or core with a resistive element to deliver exceptional thermal management, electrical insulation, and mechanical durability. Unlike standard film resistors, ceramic resistors are designed to handle significant power dissipation—ranging from a few watts to over 100W—while maintaining stable performance under high temperatures and harsh conditions. The ceramic material (typically alumina or steatite) offers flame retardancy (UL94V-0), excellent dielectric strength, and resistance to thermal shock, making it the preferred choice for power supplies, motor drives, home appliances, and specialized heating applications.
At RST Electric, we manufacture a complete portfolio of ceramic resistors, including SQM (vertical/radial), SQP (horizontal/axial), HR (ceramic heating elements for consumer products), and SQH (bracket mount with leads) series. With over 10 years of engineering expertise and ISO 9001 certified facilities, we deliver components that combine precision, durability, and cost-effectiveness for demanding industrial, automotive, and consumer applications.
·Power Rating: Determine the continuous or intermittent power the resistor must handle. Our SQP and SQM series cover 1W to 20W for PCB applications; the SQH series extends to 50W for chassis mounting; the HR series ranges from 3W to 20W for low-temperature heating applications.
·Resistance Value & Tolerance: Choose from 0.1Ω to 100kΩ with tolerances of ±1%, ±2%, ±5%, or ±10%. Tight tolerances ensure precision in current sensing, voltage division, and temperature control circuits.
·Mounting Style:
SQP (horizontal axial) – ideal for through-hole PCB mounting with low profile.
SQM (vertical radial) – saves board space by standing upright, perfect for dense layouts.
SQH (bracket mount) – combines leads with mounting brackets for secure chassis attachment and enhanced heat dissipation.
HR (ceramic heating element) – designed for integration into consumer products with custom shapes and lead configurations.
·Application Type:
For general power dissipation (bleeder resistors, snubbers, braking), choose SQP, SQM, or SQH.
For low-temperature heating (aroma diffusers, wax warmers, oil burners), choose HR series.
·Environmental Conditions: Consider operating temperature range (-55°C to +200°C for power resistors; 80°C–165°C for heating elements), humidity resistance, and flame-retardant requirements.
By evaluating these parameters, you can ensure that your ceramic resistor delivers reliable, long-term performance in its intended application.
SQP Series – Horizontal Axial Ceramic Resistor
The SQP series is the workhorse of our resistor family. With a rectangular ceramic housing and axial leads, it mounts horizontally on PCBs, making it ideal for power supplies, motor drives, and home appliances. Power ratings range from 1W to 20W, with resistance values from 0.1Ω to 100kΩ. The SQP series offers excellent solderability, low noise, and high insulation resistance—perfect for general-purpose power applications where reliability is paramount.
SQM Series – Vertical Radial Ceramic Resistor
When board space is at a premium, the SQM series provides a space-saving vertical solution. Its radial leads allow upright mounting, reducing PCB footprint by up to 50% compared to axial counterparts. Available in 1W to 20W ratings, the SQM series is ideal for compact power supplies, LED drivers, and automotive electronics. The vertical orientation also promotes natural convection, aiding heat dissipation in dense layouts.
HR Series – Ceramic Heating Element for Consumer Products
The HR series is a specialized ceramic heating element designed for low-temperature applications such as aroma diffusers, essential oil warmers, wax melters, and coffee warmers. Operating at surface temperatures between 80°C and 165°C, this resistor gently releases fragrance without burning oils or wax. Available in 3W to 20W power ratings with voltage options including 120V AC, 240V AC, 12V DC, and 5V USB, the HR series is built for safety and energy efficiency. Its ceramic housing remains cool to the touch when properly integrated, making it ideal for consumer wellness and automotive fragrance products.
SQH Series – Bracket Mount Ceramic Resistor
The SQH series bridges the gap between PCB-mounted and chassis-mounted resistors. It combines a ceramic housing with integrated metal brackets and axial leads, allowing secure attachment to a chassis or heatsink via screws. Power ratings from 10W to 50W make it ideal for applications where moderate power dissipation is needed but space constraints prevent the use of larger units. The SQH series is commonly used in battery chargers, servo drives, and industrial test equipment.
| Application Area | Specific Us | Recommended Series |
| Power Supplies | Bleeder resistors, snubber circuits, pre-charge networks | SQP, SQM |
| Motor Drives & Controls | Dynamic braking resistors for VFDs and servo drives | SQH, SQP |
| Home Appliances | Fan speed control, surge suppression | SQP, SQM |
| Automotive Electronics | Current sensing, DC-DC converters | SQM, SQH |
| Industrial Automation | Load resistors for PLCs, robotics | SQH, SQP |
| Consumer Wellness | Aroma diffusers, wax warmers, oil burners | HR |
| Automotive Fragrance | 12V-powered scent diffusers | HR (12V DC) |
| Test & Measurement | Precision loads, calibration shunts | SQP, SQH |
| Renewable Energy | Discharge resistors for solar inverters | SQH, SQP |
Q: What is the difference between SQP and SQM series ceramic resistors?
A: SQP series has axial leads for horizontal PCB mounting, offering low profile. SQM series has radial leads for vertical mounting, saving board space. Both are available in 1W to 20W with similar electrical characteristics; the choice depends on your PCB layout constraints.
Q: When should I use an SQH series resistor instead of a standard ceramic resistor?
A: The SQH series features integrated mounting brackets for secure chassis attachment, enabling better thermal transfer and mechanical stability. Use it when your application requires chassis mounting or when PCB-mounted resistors would be subject to vibration.
Q: What is the HR series used for?
A: The HR series is a ceramic heating element designed for low-temperature consumer products such as aroma diffusers, essential oil warmers, wax melters, and coffee warmers. It operates at safe surface temperatures (80°C–165°C) and is available in multiple voltage configurations for global and automotive
applications.
Q: Can ceramic resistors be used in outdoor or harsh environments?
A: Yes. Our SQH series can be supplied with conformal coating for moisture resistance. For HR series, the ceramic housing itself provides good environmental protection for indoor consumer use. Custom encapsulation options are available for demanding environments.
Q: What is the typical lifespan of a ceramic resistor?
A: With proper derating (operating below maximum power) and adequate cooling, ceramic power resistors can operate for decades. HR series heating elements are designed for thousands of heating cycles in consumer products.
To learn more about our specific ceramic resistor offerings, please explore the following product categories:
·SQP Series (Horizontal Axial) – General-purpose, through-hole ceramic resistors for power supplies and home appliances.
·SQM Series (Vertical Radial) – Space-saving upright resistors for compact PCB designs.
·HR Series (Ceramic Heating Element) – Low-temperature heating elements for aroma diffusers, wax warmers, and consumer wellness products.
·SQH Series (Bracket Mount) – Medium-power resistors with mounting brackets for secure chassis attachment.
Whether you need a standard ceramic resistor for a new power supply, a space-saving SQM for a compact design, a heating element for a consumer product, or a custom-engineered solution for a specialized application, our team is ready to assist. Contact us today for a detailed proposal, technical consultation, or factory tour.
