The CMD325 from Custom MMIC is a negative controlled, wideband GaAs MMIC 6-bit digital attenuator die designed to operate from the DC to 30 GHz frequency range. Each bit of the attenuator is controlled by a single voltage of either 0 V or –5 V. It features a low insertion loss of 4 dB at 12 GHz and the attenuation accuracy is typically 0.2 dB step error.

Model 50FHLB-xxx-100 is a uni-directional 100 Watt fixed attenuator that operates DC-3 GHz. It has a heatsink that is only 2.25 inches in diameter. It is available with 50 Ohm coaxial RF connectors N, 4.3/10, or 7/16.  It is currently available with attenuation values 10, 20, or 30dB. There are mounting holes (8-32 threads) on both ends of the heatsink.

JFW offers the 50FHAO-XXX-100 100 Watt fixed attenuator designed to operate in the DC to 3 GHz frequency range for military and commercial applications.

JFW’s 50P-2103 SMA is a programmable attenuator designed with USB control, making it ideal for R&D labs or other flexible test environments. It covers the 0.1 – 18 GHz frequency range, and it has a 0 – 65 dB attenuation range by 0.5 dB steps.

JFW’s Model 50P-2101 is a 50 OHM solid-state programmable attenuator with attenuation range 0 to 63.5 dB by 0.5 dB steps. The unit operates bi-directionally with the input rated for +24 dBm and the output rated for +15 dBm.

JFW’s 50P-2111 is a 50 Ohm solid-state programmable attenuator with attenuation range 0 to 95 dB by 1dB steps.  The unit operates bi-directionally over the frequency range 200 MHz to 8 GHz.  The unit is labeled “input” and “output” because the RF power rating is different for each port.  The input port is rated for +24 dBm.  The output port is rated for +15 dBm.  It is available with SMA female RF connectors.

The TS05XX Series chip attenuator is designed with increased power handling and requalified to higher power levels. The increased power handling capability is based on individual device attenuation values as follows: 0-1 dB attenuators are rated at 5 W, 2-3 dB rated at 2 W, 4-10 dB rated at 1 W, and 11-20 dB rated at 0.75 Watts.  It can be used for mobile networks, broadcast, high power amplifier, military, and instrumentation applications.

JFW offers the 50PA-1144-XX 19-inch rack mount attenuator assembly comprising 50 Ohm sold-state step attenuators with an attenuation range of 0 to 62dB by 1dB steps and operation from 100 MHz to 18 GHz.



Attenuators are the exact opposite of an amplifier. It is used to reduce the intensity of either electricity or sound. For example the digital impulse that is used to drive a speaker may be stepped down to prevent the lower range speakers from failing. An equalizer in music is a form of amplifier and attenuator rolled up into one. It however targets on particular frequency. Every instrument in a musical symphony and even the human voice occupy a certain frequency range. Each not of a violin for example has a very specific frequency. The A string on a violin is exactly 440Hz. Using an attenuator, one can target the exact frequency of 440Hz and reduce its intensity. It can even be attenuated all the way down to zero. If this were to happen then every time an A not of a violin was played, it would not be heard.

This sort of technology is used to clean up sounds of recordings and other sounds in a recording. It is even possible to pin point the frequency range of the human voice then use an attenuator to reduce it to zero. Imagine if one were to take a recording of a song and attenuate just the vocal portion, the song will now resemble a minus one track.

Attenuators have other more sophisticated commercial uses. The can be used to reduce the electrical impulses that were amplified to travel long distances and may still carry strong energy when it arrives, so it needs to be attenuated before it is channeled for processing.