1. Products
  2. RF and Microwave
  3. Attenuators
  4. Digital Step Attenuators
  5. HMC305S


Features and Benefits

  • Glitch Free State Transitions
  • 0.5 dB LSB Steps to 15.5 dB
  • TTL/CMOS Compatible Serial Data Interface
  • SPI Compatible Serial Output
  • Excellent Attenuation Accuracy: ± 0.25 dB Typical Bit Error
  • Single + 3.3V to 5V Supply
  • ESD rating: Class 2 (2kV HBM)
  • Drop-in Replacement for HMC305ALP4E

Product Details

The HMC305SLP4E is a broadband 5-bit positive control Silicon IC digital attenuator with CMOS compatible serial-to-parallel driver package in a leadless QFN 4x4 mm SMT package. Covering 0.4 to 6 GHz, the insertion loss is typically less than 1.6 dB. The attenuator bit values are 0.5 (LSB), 1, 2, 4, and 8 dB for a total attenuation of 15.5 dB. Attenuation accuracy is excellent at ±0.25 dB typical with an IIP3 of up to +52 dBm. Five bit serial control words are used to select each attenuation state. A single Vcc bias of +3.3V to +5V is required.

The HMC305S(E) is a replacement for the HMC305A(E), HMC305B(E) and HMC305(E).


  • Cellular Infrastructure
  • Wireless Infrastructure
  • Microwave Radio & VSAT
  • Test Instrumentation

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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Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
HMC305SLP4E Material Declaration Reliability Data 24-Lead QFN (4mm x 4mm w/ EP)
HMC305SLP4ETR Material Declaration Reliability Data 24-Lead QFN (4mm x 4mm w/ EP)
Wafer Fabrication Data

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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.