Open-air resistors

  • 30-Apr-2009 04:34 EDT
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TT electronics IRC's OARS-3 open-air current sense resistors are metal alloy strip resistors featuring a flame-proof open-air surface mount design, providing superior thermal temperature cycling and allowing the resistors to operate to power ratings of at least 3 W. The open construction of the resistor, including the open-air design and flexible leads, isolates the hotspot from the circuit board material, preventing circuit board damage. The flame-proof resistor consists of a heavy-gauge metal resistance alloy with solder-compliant copper terminations. The resistors are ideal for surge and pulse circuits, ac power applications, current sensing, and feedback circuits while presenting a low inductance signature. They feature a resistance range of 2 to 15 mW, with tolerance to ±1% or ±5%. Inductance is less than 10 nanohenries, with operating temperatures of -40 to +125°C (-40 to +257°F).
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