MIL-PRF-27/358C
REQUIREMENTS:
Electrical ratings:
See table I.
Working Voltage (peak):
100 volts
Frequency range:
150 Hz to 75 kHz
Design and construction:
Dimensions and configuration: See figure 1.
Duty cycle:
Continuous.
Terminals:
Solid wire.
Composition:
Copper clad steel.
Diameter:
0.016 inch ±0.001 (0.41 ±0.03 mm).
Length:
1.00 inch ±0.25 (25.4 ±6.4 mm).
Final finish: Tinned, 100 percent coverage, electroplated in accordance with ASTM B 545. Use of tin-lead
(Sn-Pb) finishes are acceptable provided the minimum lead content is 3 percent.
Weight: 7.5 grams max.
Altitude: 150,000 feet, maximum.
Operating temperature range: -55°C to +130°C.
Terminal strength: MIL-STD-202, method 211, test condition A, 2.0 pounds.
Thermal shock: 25 cycles, method 107, MIL-STD-202, test condition A-1.
Vibration (high frequency): MIL-STD-202, method 204, test condition B.
Dielectric withstanding voltage:
At sea level: 200 V rms.
At barometric pressure: 200 V rms.
Electrical characteristics:
No Load (center tap unbalanced): ±1 percent at 1 volt, 5 kHz across the primary.
Harmonic distortion: Total harmonic content of output shall be a maximum of 5 percent at the specified
power level (see table I) at 1 kHz, 400 Hz, and 150 Hz..
Insertion loss: At the specified power level (see table I), the insertion loss shall be a maximum of 3.0 dB
at 1 kHz.
Frequency response: ±3 dB at the rated source and load impedances (see table 1) with 1.0 mW level
output and a reference frequency of 1 kHz over a frequency range of 150 Hz to 75 kHz.
Polarity: Additive when appropriate terminals are connected. For configuration A, connect terminals 3
and 4, 5 and 6. For configuration B, connect terminals 3 and 5. (see figure 1, configurations A and B.)
Self-resonance: The self-resonant frequency shall be greater than 150 kHz when measured with the
secondaries carrying the specified load and the secondary voltage observed.
Marking location: See figure 1.
Part number: M27/358- (dash number from table I).
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