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EMI & EMC Solutions > Cylindrical Style Filters > Cylindrical Filters > Cylindrical FIlter # A-254  
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Cylindrical FIlter # A-254, Cylindrical Filters

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Performance Characteristics

Rating: Filters are designed for continuous operation at rated current and voltage. Operating temperature range is -55º C to +125º C. AC filters may be operated at power frequencies up to 400 Hz.

Terminal Style: All filters rated at 10 amps or less have solder type terminals; those rated above 10 amps have stud-type terminals.

Temperature Rise: The case temperature rise shall not exceed 25º C when operated at rated current, voltage, and line frequency.

Dielectric Test: Filters shall withstand the over-voltage dielectric test specified by MIL-PRF-15733 as applicable.

Insulation Resistance: The insulation resistance of these filters shall be in accordance with MIL-PRF-15733.

Voltage Drop: The voltage drop shall not exceed 1 % of rated voltage when the filter is carrying the specified rated current. AC filter voltage drop shall be measured at unity power factor.

Insertion Loss: The loss shown at 0.15 MHz is conservatively rated and is in accordance with MIL-STD-220. Additional data on request.

Terminal Strength: Terminals shall pass the requirements of MIL-PRF-15733.

Specifications  · Filter Circuit and Application Information


Current Rating

50 A


Voltage (AC)

250 V

Voltage (DC)

600 V

Insertion Loss @ 0.15 MHz


Body L

6.00 in

Body D

2.48 in

Terminal Dimensions A

0.75 in

Terminal Dimensions B Thread


Terminal Dimensions C Thread

1 1/8-20

Terminal Dimensions Z

1.046 in

Filter Circuit and Application Information
Three different types of filter circuits are shown in this series; L, Pi and T; each with its own characteristics An analysis of each application by engineering personnel will indicate a preferred circuit from cost, performance and size considerations, as directed below:

  • L - Least expensive but most effective with high impedance noise sources.
  • Pi - Often used in line filters when source and load impedance are not known but can increase unfiltered interference in control circuits or switch circuits.
  • T - Reduces line noise level best in low impedance applications but most expensive.
L filters provide significant insertion loss because of the impedance mismatch created when the capacitor end of the filter is mounted towards the high impedance noise source (load) and the inductor end is mounted towards the low impedance line.

Pi filters usually provide maximum "dB per dollar" in a matched 50 ohm system, but many times are less effective under actual operating or test conditions. They are particularly suspect in installations involving switching transients, since they can in some instances increase the interference problem rather than correct it.

The T circuit is used primarily with switching circuits. It reduces noise level on the system lines, causes no deterioration in the life of switching contacts, and in some instances actually prolongs switch contacts life.

The successful operation of any high frequency filter depends on adequate bonding and good RF isolation between input and output. The filter must be bonded to same potential as one side of the RF noise source being filtered. The performance of the filter can be completely masked by ineffective bonding or poor RF isolation between input and output circuits. The RF filter uses the case as common ground for the internal capacitor and cannot provide its total performance if RF is permitted to bypass the filters by means of coupling between input and output circuits.

If you have any questions about the circuit to be employed, please call our engineering department for application advice and information.


·  Performance Characteristics


(PDF, 430KB)

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