Features and Benefits

  • Attenuation range: 0.5 dB (LSB) steps to 31.5 dB
  • Low insertion loss: 1.6 dB at 3 GHz
  • Excellent attenuation accuracy
  • High linearity
    • Input 0.1dB compression (P0.1dB): 33 dBm typical
    • Input third-order intercept (IP3): 55 dBm typical
  • High RF input power handling: 28 dBm
  • Low phase shift: 25° at 3 GHz
  • Pin compatible to the HMC1122
  • See data sheet for additional features
HMC624A-EP Supports defense and aerospace applications (AQEC standard)
  • Download HMC624A-EP data sheet (pdf)
  • Extended industrial temperature range: −55°C to +105°C
  • Controlled manufacturing baseline
  • 1 assembly/test site
  • 1 fabrication site
  • Product change notification
  • Qualification data available upon request

Product Details

The HMC624A is a 6-bit digital attenuator with a 31.5 dB attenuation control range in 0.5 dB steps.

The HMC624A offers excellent attenuation accuracy and high input linearity over the specified frequency range from 100 MHz to 6.0 GHz. However, this digital attenuator features external ac grounding capacitors to extend the operation below 100 MHz.

The HMC624A is integrated with two dies: a CMOS driver and a gallium arsenide (GaAs) RF attenuator. The CMOS driver provides both serial and parallel control of the RF attenuator. The device also features a user-selectable power-up state and a serial output port for cascading other serial controlled components.

The HMC624A operates with a single positive supply voltage from 3 V to 5 V, and provides a CMOS-/TTL-compatible control interface.

The HMC624A comes in a RoHS compliant, compact, 4 mm × 4 mm LFCSP package, and is pin compatible to the HMC1122 except for the ACGx pins.


  • Cellular infrastructure
  • Microwave radios and very small aperture terminals (VSATs)
  • Test equipment and sensors
  • Intermediate frequency (IF) and radio frequency (RF) designs


Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.