Advanced welded spot of anti-surge wire wound resistor | Thin Film Resistor Manufacturer | FIRSTOHM

The wire wound resistors have been around for more than a half century, they are usually existing in high power circuit design, but are not suitable for anti-surge applications. The reason is a reliability problem of the solder joint between alloy wire and metal cap, when the wire wound resistors are produced, the joint of the welded spot and metal cap may have false welding on the welded spot. Hence, the welded spot will be easily broken when surge across it with huge energy. FIRSTOHM is a high performance MELF resistors, SMD resistors, metal film resistors, surge resistors, wire wound resistors, precision resistors, High voltage resistors, high Power resistors, metal oxide resistor, thin film resistors, fixed resistors manufacturer from Taiwan since 1969. FIRSTOHM is one of the few companies who is able to design thin-film MELF resistors according to customer's requirements with high quality and reliability. We’re specialized in thin-film resistors since 1969, ISO9001/14001 certificated manufacturer. Over 50 years of industry experience for resistors design and manufacturing facility.

qrc@firstohm.com.tw

On Duty: 9am - 6pm

Advanced welded spot of anti-surge wire wound resistor | Automotive-Grade Resistors Manufacturer | FIRSTOHM

The wire wound resistors with patents of weld spot. | More than 50 years of resistor manufacture experience

The wire wound resistors with patents of weld spot.

Advanced welded spot of anti-surge wire wound resistor

The wire wound resistors have been around for more than a half century, they are usually existing in high power circuit design, but are not suitable for anti-surge applications. The reason is a reliability problem of the solder joint between alloy wire and metal cap, when the wire wound resistors are produced, the joint of the welded spot and metal cap may have false welding on the welded spot. Hence, the welded spot will be easily broken when surge across it with huge energy.


Implement

FIRSTOHM realizes the reliability of the welded spot is a key factor to withstand surge. Therefore, we did some researches and avovid this problem. Below pictures show the original welded spot and after implementation:

Traditional wire-wound resistor
Original - Traditional wire-wound resistor – Welded spot is not reliable against surge

Improved anti-surge welded spot
FIRSTOHM - Improved anti-surge welded spot

SWAT/SWMT : Anti-Surge Wire Wound Fast-Fuse (MELF) Resistor

Feature
  • Granted multinational patents.
  • Enhanced welded spot is reliable against surge.
  • Fast-acting fuse device for high power applications.
  • Advanced combined anti-surge & fast-fuse structure.
  • Flameproof multi-layer coating equivalent to UL 94 V-0.
  • Flameproof feature equivalent to overload test UL 1412.
  • Thermal fuse to protect against overheating in electronic products.
Reference Design
Illustration of Anti-Surge Wire Wound Fast-Fuse (MELF) Resistor in circuit
Structure
To emphasize position of thermal fuse and explain how to structure a wirewound resistor
Application
  • Power supply
  • Charger for mobile phone
  • LED Lighting
  • Motor star-up protection
  • Motor ignition
General Specification

The specifications of Anti-Surge Wire Wound Fast-Fuse (MELF) Resistor

Files Download
Anti-Surge Wirewound Fast-Fuse Resistor
Anti-Surge Wirewound Fast-Fuse Resistor

Anti-Surge Wirewound Fast-Fuse Resistor is specially design a fusible function upon wirewound resistor.

Download
Anti-Surge Wirewound Fast-Fuse MELF Resistor
Anti-Surge Wirewound Fast-Fuse MELF Resistor

Anti-Surge Wirewound Fast-Fuse MELF Resistor is the same as SWM series but specially add fusible function.

Download

Advanced welded spot of anti-surge wire wound resistor | Surge Resistant MELF Resistor Manufacturer | FIRSTOHM

Located in Taiwan since 1969, First resistor & condenser Co. Ltd. has been a manufacturer of MELF resistors manufacturer. Their main thin film MELF resistors include, automotive grade resistors, surface mount resistors, fusible resistors, SMD resistors, chip resistors, fixed resistors and fusible thin film resistors, which are being widely used in industrial applications such as power supply, smart meter, solar inverter, energy storage device, electric vehicle, communication equipment, and medical device.

FIRSTOHM is one of the few companies who is able to design thin-film MELF resistors according to customer's requirements with high quality and reliability. We’re specialized in thin-film resistors since 1969, ISO9001/14001 certificated manufacturer.

FIRSTOHM has been providing customers with high quality carbon film and metal film resistors since 1969, with both advanced technology and 50 years of experience, FIRSTOHM ensures that each customer's demands are met.