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Resistors
Resistors from alfatec: Precision and Reliability for Your Electronics
In the world of modern electronics, precise and reliable passive components are the foundation of every high-quality circuit. alfatec GmbH & Co. KG is your specialized partner for a comprehensive range of resistors that meet the highest technical standards. From standard applications to highly specialized use cases – we provide the right components for engineers, technicians, and purchasers. Discover our portfolio and find the optimal solution for your project.
Our Resistor Portfolio: Variety for Every Application
The demands on electronic circuits are as diverse as the end products themselves. That’s why alfatec, in cooperation with leading manufacturers such as Royalohm and Firstohm, offers a wide range of resistor types to ensure you find the right component for every challenge.
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Overview of Resistor Types Available at alfatec
We offer a carefully selected range of resistors distinguished by their form factor, materials, and specific properties.
SMD Resistors (Chip Resistors): Compact and Efficient
The ongoing miniaturization in electronics requires ever smaller yet more powerful components. Our SMD resistors (Surface-Mount Devices) are optimized for automated assembly and are ideal for compact circuits with high component density.
- Manufacturer: Royalohm
Technical Features:
- Sizes: 0201, 0402, 0603, 0805, 1206 to 2512
- Materials: High-purity ceramic substrates (aluminum oxide) with thick-film or thin-film resistor layers
- Tolerances: From standard (±5%) to high-precision (±0.1%)
- Temperature Coefficient (TCR): Up to ±25 ppm/°C for applications requiring maximum stability
- Special Types: Automotive-qualified (AEC-Q200), anti-sulfur, high-power, and high-voltage variants
Advantages:
- Space-saving for miniaturized electronics
- Cost-efficient for automated production (wave and reflow soldering)
- Versatile for general, automotive, telecom, and industrial electronics
Applications:
- Automotive control units
- Telecommunications (smartphones, routers)
- Consumer electronics and medical devices
- Industrial control and sensor systems
Power Resistors: When Every Watt Counts
For applications where significant electrical power must be converted into heat, we offer specialized power resistors in robust housings.
- Manufacturer: Royalohm
Types:
- Cement resistors and aluminum-housed resistors
Technical Features:
- Mounting: Often designed for heatsink mounting to maximize heat dissipation
- High Power Dissipation: Designed for continuous operation under heavy load
- Form Factors: Axial, radial, and radial terminal versions
Advantages:
- Excellent heat dissipation for reliable high-power operation
- Rugged construction resistant to vibration and mechanical stress
Applications:
- Braking resistors in frequency converters
- Load resistors for test scenarios
- Heating elements and inrush current limiters
MELF Resistors: Robustness and Pulse Resistance
MELF resistors (Metal Electrode Leadless Face) are a technologically superior alternative to conventional chip resistors. Their cylindrical shape and high-quality materials ensure outstanding performance, especially in demanding applications.
- Manufacturer: Firstohm
Technical Features:
- Structure: Cylindrical ceramic body with metal film resistor layer
- Pulse Resistance: Excellent resistance to high-energy pulses and surge voltages (up to 10 kV in the SRM series)
- Thermal Dissipation: Significantly better than chip resistors, enabling higher power density
- Long-Term Stability: High precision and low drift over lifetime
- Special Types: Anti-surge, precision, high-voltage, current sense, and automotive-qualified (AEC-Q200)
Advantages:
- Superior pulse resistance for protection against transients
- High reliability for safety-critical and long-life systems
- Precise performance with tight tolerances and low TCR
Applications:
- Power supplies and frequency converters
- Smart meters and solar inverters
- EV charging circuits (e.g., pre-charge circuits)
- Industrial automation
Through-Hole Resistors (THT): Classic and Powerful
Through-hole resistors are the classic choice for applications requiring manual assembly, high mechanical stability, or high power dissipation.
- Manufacturers: Royalohm, Firstohm
Types:
- Carbon Film Resistors: Cost-effective all-rounders
- Metal Film Resistors: High precision, low TCR, low noise
- Metal Oxide Film Resistors: High temperature resistance and good pulse load capacity
- Wirewound Resistors: For very high power dissipation and as fusible resistors
Technical Features:
- Form: Axial and radial leads for flexible mounting
- Power Range: From milliwatts to several watts
- Materials: Ceramic bodies with various resistor layers and protective coatings
Advantages:
- Mechanical stability with strong PCB connection
- High load capacity for power applications and heat dissipation
- Easy prototyping with hand soldering
Applications:
- Power supplies and audio amplifiers
- Household appliances
- Prototyping and repair services
Our partners for resistors
Royalohm
Our partner Royalohm, one of the most renowned manufacturers of electrical resistors in the world, impresses with over 40 years of experience. With production facilities in Thailand and China, they control the entire manufacturing process. They also ensure continuous innovation in various application areas through in-house R&D developments.
Firstohm
Founded in 1969, the Taiwanese company specialises in resistors, including MELF resistors, overvoltage and high voltage resistors, precision resistors and high power and current sense resistors. Firstohm has also pioneered the development of various types of resistors to meet the changing needs of the global industry.
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See the quality and performance of our resistors for yourself. Request a no-obligation quote today or download the data sheets.
alfatec – your partner for high-quality electronic components
As your expert partner for electronic components, alfatec supports you in selecting the right resistors for your applications. We offer comprehensive advice and are happy to answer any questions you may have about power modules.
Do you have questions about our resistors or would you like a personal consultation? Feel free to contact us.