MIL-PRF-27/18E
REQUIREMENTS: (When numbers in parentheses, such as (1-2) are used, they indicate the winding and the
extreme terminals of the winding.)
Electrical ratings:
Primary voltage (1-2): 5.8 voltamperes, 115 volts rms, 60 Hz.
Secondary voltage (3-5): 48 volts rms at rated load rectified.
Working voltage: (1-2) 357 volts rms maximum.
(3-5) 357 volts rms maximum.
Design, configuration, and physical dimensions: See figure 1.
Duty cycle: Continuous.
Case: Encapsulated.
Material: Epoxy.
Terminals: Solder type.
Height: .25 inch (6.35 mm) maximum.
Width: .125 ±.02 inch (3.18 ±0.51 mm).
Weight: .50 pound, maximum.
Operating temperature: -55°C to +130C.
Turns:
Primary (1-2): 2,300 turns.
Secondary (3-5): 1,100 turns.
Ratio: 1:0.48.
Terminal strength: Method 211 of MIL-STD-202, test condition A, 2 pounds.
Dielectric withstanding voltage (each winding) at sea level: MIL-STD-202, method 301; test voltage 1,000 volts
rms.
Electrical characteristics:
No load: With 115 V rms and 60 Hz across (1-2), current in (1-2) shall not exceed 25
milliamperes, and the power in (1-2) shall not exceed 1.0 watts. Voltage across (3-5) shall be
55 volts rms ±2 percent.
Rated load: With 115 volts rms, 60 Hz across (1-2), and the rated current, the voltage across
(3-5) shall be 48 volts rms ±3 percent, using rectified load shown on figure 2 (a .06 A dc, full wave
bridge, capacitance filter).
DC resistance:
(1-2): 305 ohms maximum.
(3-5): 56 ohms maximum.
Efficiency: 70 percent minimum at rated load.
3
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