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DC-40 GHz (L, S, C, X, Ku, K, Ka Band) 2-bit Digital Attenuator

The CMD281 is negative controlled, wideband GaAs MMIC 2-bit digital attenuator die which operates from DC to 40 GHz. Each bit of the attenuator is controlled by a single voltage of either 0 V or –5 V. The attenuator bit values are 2 dB and 4 dB, for a total attenuation of 6 dB. The CMD281 has a low insertion loss of 1.2 dB at 18 GHz and the attenuation accuracy is typically 0.1 dB step error. The CMD281 is a 50 ohm matched design which eliminates the need for RF port matching. The CMD281 offers full passivation for increased reliability and moisture protection.


  • Ultra wideband performance
  • Low insertion loss
  • Wide attenuation range
  • Small die size



Life Cycle

For new design

Space Qualification

  • Ready for Space Screening


  • DIE
  • RoHS Compliant
  • ESD Rating: Class 1A
Frequency (GHz)DC - 40
Number of Bits 2
Insert. Loss (dB)1.2
Attn Range (dB)6
Input P0.1dB (dBm)28
Input IP3 (dBm)42
Step Error (dB)0.1
Control Voltage (V)0 / -5

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Phone: 978-467-4290
Fax: 978-467-4294

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Custom MMIC

300 Apollo Drive
Chelmsford, MA 01824
Phone: 978-467-4290
Fax: 978-467-4294

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©2006-2020 Custom MMIC
All rights reserved.

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In addition to offering delivery from stock on our own evaluation boards for nearly all our die and packaged devices, Custom MMIC has also put nearly 30% of our devices into the X-Microwave block system. This drop-in simulation, prototyping, and production system enables efficient and expedient microwave and millimeter-wave circuit development and testing.

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Custom MMIC Space Qualified MIMCs
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Custom MMIC strives to design all of our MMIC devices in a manner such that they can be readily chosen for your space application. We have an extensive history of successfully screening and qualifying our product to space applications per MIL-PRF-38534, MIL-PRF-38535, NASA INST standards and customer specific requirements. We collaborate with our customers to determine the appropriate screening and qualification based on their specific mission. Our space product screening and qualification are performed in-house and with approved partners. Whether you are looking for a space screened die, hermetically sealed packaged product or non-hermetic packaged product, Custom MMIC is prepared to help you address your qualification requirements

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