QM Metal Film Precision Resistors 1/4 Watt 1%

Overview:

The Metal Film Resistors Fill The Gap in Between Carbon Film and Metal Oxide resistors . The Resistive element is a high content of AL203 ceramic rod on which a thin Film of Ni/Cr alloy is deposited by vacuum sputtering system. Then contact caps are pressed on to the ends of the rod and a helical grove cut through the film to give the required resistance value. Connecting copper wire is welded to the end caps. Finally the resistors are coated with multiple layers of insulation lacquer.

Features:

• Formed By spattering Ni-Cr Alloy On to Highly Concentrated Aluminum Oxide Ceramic Rods
  
• Meets Military specification MIL-R-10509F
  
• Very low current noise
• Pure Copper leads
• Precision 1% Tolerance
• Temperature coefficient of 50ppm/ºC
• Makes an excellent precise resistor due to its low temperature coefficient
• Moisture Proof Blue resin Coating ensures long Term stability

Specifications:

• Wattage : 0.25 Watt
  
• Operating Temperature Range : -55℃ ~ +155℃
  
• Temperature Coefficient : 50 PPM
  
• Short Time overload : Within ±(0.5%+0.05Ω)
• Insulation Resistance : 104MΩ or more
  
• Pulse Overload : Within ±(0.5%+0.05Ω)
  
• Tolerance : 1%
• Temperature Cycle : Within ±(1%+0.05Ω)
  
• Load Life In Humidity : Within ±(1%+0.05Ω)

Please Note that in terms Of Quality these resistors can not be compared to cheaper 1%  tolerance resistors found in the market . The cheaper variants have Magnetic Leads and do not have resin coatings and plus they have much higher temperature coefficients