MIL-PRF-27/195A
REQUIREMENTS: (When designations or colors in parentheses, i.e., (1-2) are used,
they indicate the winding and the extreme terminals of the winding.)
Electrical ratings:
Primary voltage (1-2): 4 volts rms, 7.7 kilohertz.
Primary current: 4.0 milliamperes, rms.
Primary power: .15 volt ampere.
Secondary voltage (5-4): 8.1 volts rms, .04 ampere rms.
DC resistance:
Primary (1-2): 35 ohms, maximum.
Secondary (5-4): 2.15 ohms, maximum.
Working voltage:
(1-2): 166 volts peak, maximum.
(5-4): 33 volts peak, maximum.
(1-2) to (4-5): 200 volts peak, maximum.
Design and construction:
Dimensions and configuration: See figure 1.
Duty cycle: Continuous.
Case: Encapsulated.
Material: Epoxy.
Weight: 3 ounces.
Terminals: Pin type.
Material: Type S, tin, lead or lead alloy coating, in accordance with A-A-59551.
Height: .350 inch, minimum.
Diameter: AWG 20 (.032 inch).
Operating temperature range: -55șC to +130șC.
Terminal strength: MIL-STD-202, method 211, test condition A, 2 pounds.
Dielectric withstanding voltage (at sea level): 900 volts rms.
Electrical characteristics:
No load: With 40 volts rms and 7.7 kilohertz in (1-2):
Current in (1-2): 4.0 milliamperes rms.
Power in (1-2): .15 watt, maximum.
Voltage across (5-4): 8.08 volts rms ±1 percent.
Rated load: With 40 volts rms and 7.7 kilohertz (1-2):
Voltage across (5-4): 8.1 volts rms ±10 percent.
Pulse inductance: The transformer shall meet the following electrical requirements when
tested under the following conditions using the test circuit in figure 2. The values shown
shall be applicable to parts with a squareness ratio of 0.80 to 0.94.
a. Volt-millisecond product (ExT) = 2.85 ±5 percent at Imag 50 milliamperes ±5. (For parts
with a squareness ratio above 0.94, the ExT = 2.50 ±5 percent at Imag 50
milliamperes ±5).
b. Linear current (I) = 3.4 milliamperes ±0.6 at time T/2. (For parts with a squareness ratio
above 0.94, I = 7.0 milliamperes, maximum at time T/2.)
c. I Reset = 13.3 milliamperes ±10 percent.
d. Pulse width (T) = 240 microseconds, nominal. (For parts with a squareness ration above
0.94, the T = 200 microseconds, nominal.)
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