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"Spring" Air Core Inductor Specifications

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Environmental

  1. Temperature coefficient of inductance
    Specification
    +5 to 70 ppm/° C typical over -40° C to +125° C at frequency specified in product table.
    Test method/condition
    The inductor shall be placed in an LC oscillator circuit. The inductor will be the only portion of the circuit in the environment chamber. The change in L will be indicated by the change in f and calculated using the equation below.
  2. Static humidity
    Specification
    Inductance shall not change more than ±5%.
    Q shall not change more than ±10%.
    Test method/condition
    Inductors shall be subjected to 95 ±5% R.H. at 50° C ±2° C for 100 hours. Inductors are to be tested after having air dried for two hours.
  3. High temperature storage
    Specification
    There shall be no case deformation or change in appearance.
    Inductance shall not change more than ±5%.
    Q shall not change more than ±10%.
    Test method/condition
    Inductors shall be subjected to +125° ±2° C for 48 ±2 hours.
    Inductors are to be tested after 1 hour at room temperature.
  4. Thermal shock
    Specification
    There shall be no case deformation or change in appearance.
    Inductance shall not change more than ±5%.
    Q shall not change more than ±10%.
    Test method/condition
    Inductors shall be subjected, 10 times, to the following temperature cycle:
    -40° C for 30 minutes.
    +125° C for 30 minutes.
    Inductors are to be tested after 1 hour at room temperature.
  5. Low temperature storage
    Specification
    There shall be no case deformation or change in appearance.
    Inductance shall not change more than ±5%.
    Q shall not change more than ±10%.
    Test method/condition
    Inductor shall be subjected to -40° C ±2° C for 48 ±2 hours.
    Inductors are to be tested after 1 hour at room temperature.

Life

  1. High temperature load life
    Specification
    Inductors shall not have a shorted or open winding.
    Test method/condition
    Inductors shall be stored at 110° C for 1000 hours with rated current applied. Inductor shall be tested at start of test, at 500 hours, and 1000 hours. Inductors are to be tested after 1 hour at room temperature.
  2. Moisture resistance
    Specification
    Inductors shall not have a shorted or open winding.
    Test method/condition
    Inductors shall be subjected to ten 24 hour cycles at 25° C to 65° C at 80 to 95% R.H., per MIL-STD202 Method 106. During any one of the first nine cycles, inductors are to be removed from the chamber and exposed for 3 hours to -10° C. Inductors are to be tested after 2 hours at room temperature.

General

  1. Operating temperature range
    Specification
    -40° C to +125° C.
  2. Insulation resistance
    Specification
    1000 megohms minimum.
    Test method/condition
    100V DC between inductor terminals and center case.
  3. Dielectric withstanding voltage
    Specification
    No evidence of voltage breakdown.
    Test method/condition
    500V AC between inductor terminals and center of case for a maximum of 1 minute.
  4. Flammability
    Specification
    IEC 695-2-2.
    Test method/condition
    Withstands needle-flame test.

Other

  1. Solderability
    Specification
    The metalized area must have 90% min. solder coverage.
    Test method/condition
    Dip pads in flux (Alpha 100 or equiv.) and dip in solder pot (63Sn/37Pb solder) at 232° C ±5° C for five seconds.
  2. Resistance to soldering heat
    Specification
    There shall be no case deformation or change in appearance.
    Inductance shall not change more than ±5%.
    Q shall not change more than ±10%.
    Test method/condition
    Inductors shall be reflowed onto a P.C. board using 63Sn/37Pb solder paste. Solder process shall be 230° C for 20 ±2 seconds and 260° C for 5 ±2 seconds.
  3. Random vibration
    Specification
    There shall be no case deformation or change in appearance.
    Inductance shall not change more than ±5%.
    Q shall not change more than ±10%.
    Test method/condition
    Inductors shall be randomly vibrated per NAVMAT P9492 profile. Samples shall be subjected to .04G/Hz for a minimum of 15 minutes per axis, for each of three axes.
  4. Mechanical shock
    Specification
    There shall be no case deformation or change in appearance.
    Inductance shall not change more than ±5%.
    Q shall not change more than ±10%.
    Test method/condition
    Test per MIL-STD 202 method 213 test condition A. Test mounted samples 3 axes, 6 times, totalling 18 shocks. (50G's, 11ms, half-sine).
  5. Component adhesion (push test)
    Specification
    4 lbs - "Mini Spring" Series (AXXT, BXXT)
    1000 g - All other series
    Test method/condition
    The device shall be reflow soldered (232° C ±5° C for 10 seconds) to a tinned copper substrate. A dynometer force gauge shall be applied to the side of the component. The device must withstand the minimum force above without a failure of the termination to board attachment.
  6. Resistance to solvent
    Specification
    There shall be no case deformation, change in appearance, or obliteration of marking.
    Test method/condition
    Inductors shall withstand 6 minutes of alcohol.

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Updated: March 16, 1998



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