JW Miller Magnetics 4551 RF Choke Assembly Inductor Coil Electronic Component

JW Miller Magnetics 4551 RF Choke Assembly Inductor Coil Electronic Component

The JW Miller Magnetics 4551 is a wire-wound RF choke assembly manufactured by J.W. Miller Magnetics, a division of Bell Industries, Inc., based in Gardena, California. This choke assembly consists of a multi-section wire-wound coil on a ceramic bobbin core, fitted with metal mounting brackets for chassis or panel installation. The ceramic construction provides thermal stability and good electrical isolation across the coil sections.

Specifications & What's Included

• Manufacturer: J.W. Miller Magnetics (A Division of Bell Industries, Inc.)
• Part Number: 4551 (JWM Part No.)
• Type: Wire-wound RF choke / inductor assembly
• Core: Ceramic bobbin
• Coil sections: 4 visible wound sections
• Mounting: Integrated metal bracket tabs (chassis/panel mount)
• Lot Date Code: 9637
• Condition: New old stock — unused
• Packaging: Pink anti-static bag (original outer carton may not be present)

Applications

RF choke assemblies like the JW Miller 4551 are used to block or suppress high-frequency AC signals while allowing DC or low-frequency current to pass. They are standard passive components in RF and power electronics circuits, commonly used in transmitters, receivers, power supply filtering stages, RF amplifiers, and impedance-matching networks. Bracket-mount choke assemblies of this construction were widely used in military, aerospace, and commercial radio-frequency equipment from the mid-twentieth century onward, and remain applicable in any circuit requiring reliable RF filtering or energy storage in an inductive element. J.W. Miller Magnetics has been a recognized supplier of inductors, chokes, and transformers for electronic OEM applications for decades.