MIL-PRF-27/290C
REQUIREMENTS: (When colors in parentheses, i.e. (Brn-Blu), are used, they indicate the winding and
the extreme terminals of the winding. When the extreme terminals of two windings
are used, i.e. (Brn-Blu), the windings are connected in series.)
Electrical ratings:
Primary power level: 100 mW maximum at 1 kHz.
Working voltage: 50 Volts peak.
Primary impedance: (Blu-Brn) 1,125 ohms ct ±125 ohms.
Secondary impedance: (Yel-Grn) 18,000 ohms split ±2,000 ohms. Split indicates that one-fourth
of the listed impedance is available by paralleling the windings.
Primary current: 3.5 mA.
Frequency range: 300 Hz to 20 kHz, ±3 dB at 1 mW level.
Design and construction:
Dimensions and configuration: See figure 1.
Duty cycle: Continuous.
Case: Metal, one open end filled with epoxy.
Terminals: Copper clad, steel tinned 100 percent, electroplated per ASTM B545 and ASTM B339.
Diameter: 0.016 inch.
Length: 1.500 ±0.250 inch.
Weight: 0.2 ounce maximum.
Operating temperature range: -55°C to +130°C.
Altitude: 150,000 feet.
Terminal strength: Method 211 of MIL-STD-202, test condition A, 2 pounds.
Dielectric withstanding voltage (each winding):
At sea level and at reduce barometric pressure: 100 Vrms.
Polarity: Additive with terminals Blu and Yel, and Wht and Blk connected.
Electrical characteristics:
Primary Impedance: 1,125 ohms ct ±12 percent with 1 volt at 5 kHz and 3.5 mA dc applied to
the primary and 18 kΩ across the secondaries.
Primary dc resistance: 120 ohms ±25 percent.
Secondary dc resistance: 940 ohms ±25 percent.
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