MIL-PRF-27/33A
REQUIREMENTS: (When numbers in parentheses, i.e., (1-3) are used, they indicate the winding
and the extreme terminals of the winding.)
Electrical ratings:
Primary voltage (1-2): 28 volts rms, 400 Hz ±5 percent.
Secondary voltage:
(3-4): 70 volts rms, ±4 volts rms.
(3-5): 140 volts rms, ±8 volts rms centertap.
(4-5): 70 volts rms, ±4 volts rms.
Working voltage:
(1-2): 200 volts maximum.
(3-5): 200 volts maximum.
Design and construction:
Dimensions and configuration: See figure 1.
Duty cycle: Continuous.
Case: Encapsulated.
Material: Diallyl phthalate.
Terminals: Turret, solder type, brass, hot tinned dip.
Terminal height: 0.156 inch ±0.005.
Weight: 4 ounces.
Operating temperature range: -55°C to +130°C.
Terminal strength: Method 211 of MIL-STD-202, test condition A, 2 pounds.
Dielectric withstanding voltage (at sea level): 560 volts rms.
Electrical characteristics:
No load: With 28 volts, 400 Hz across (1-2); voltage across (3-4): 70 volts rms ±4 volts, and the
voltage across (4-5): 70 volts rms ±4 volts.
Rated load: With 28 volts, 400 Hz across (1-2); voltage across (3-5) shall be 140 volts rms
centertap, ±8 volts.
DC resistance,
(1-2): 16.5 ohms ±20 percent.
(3-4): 97 ohms ±20 percent.
(4-5): 112 ohms ±20 percent.
Polarity: Additive with 2 and 3 connected.
2
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