HMC425A Analog Devices Attenuator or Isolator (Quad Flat No-Lead) In Stock
Analog Devices HMC425A is a GaAs MMIC 6-bit digital attenuator operating from DC to 4 GHz, providing 0 dB to 31.5 dB attenuation in 0.5 dB steps with parallel TTL control. It supports 50 Ω systems in a compact QFN package for RF signal level control in communications and test equipment.
- Manufacturer
- Analog Devices
- Package
- Quad Flat No-Lead
- Pin Count
- 17
- Lifecycle
- ACTIVE
- Datasheet
- HMC425A Datasheet PDF
- Category
- Attenuator or Isolator
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- DC to 4 GHz frequency range covers L, S, and lower C-band RF applications
- 6-bit digital control with 0.5 dB LSB step size for 0 to 31.5 dB range
- Parallel TTL/CMOS control interface for fast switching speed under 100 ns
- Typical insertion loss under 5 dB at 2 GHz for low-noise signal paths
- 50 Ω impedance matching for direct insertion in standard RF signal chains
- Compact QFN package for space-efficient RF PCB layouts
Applications
The HMC425A is widely used in RF and microwave systems for automatic gain control, signal level adjustment, and dynamic range optimization in receivers and transmitters operating up to 4 GHz. It suits radar front-ends, software-defined radios, point-to-point links, and test instrumentation where precise 0.5 dB attenuation steps and fast digital switching are required. Its compatibility with TTL control logic enables direct interfacing to FPGAs and microcontrollers in agile beamforming and frequency-hopping communication platforms.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What attenuation range and step resolution does the HMC425A provide for RF power level control?
The HMC425A provides a 6-bit digitally controlled attenuation range of 0 dB to 31.5 dB in 0.5 dB steps, giving 64 discrete attenuation states. This fine 0.5 dB step resolution is critical in automatic gain control loops and receive chains where signal levels must be set to within 1 dB of a target for optimal ADC dynamic range utilization.
Up to what frequency can the HMC425A be used, and which wireless standards does its bandwidth cover?
The HMC425A operates from DC to 4 GHz, covering 2.4 GHz Wi-Fi, 3GPP LTE bands up to 3.5 GHz, and lower S-band radar frequencies. Its broadband response eliminates the need for band-specific attenuators in wideband receivers, enabling a single-component solution across multiple wireless standards with consistent attenuation accuracy.
How fast does the HMC425A switch between attenuation states, and why does switching speed matter in frequency-hopping radios?
The HMC425A switches between attenuation states in under 100 ns using its parallel TTL control interface, which is fast enough for frequency-hopping systems with hop rates up to several megahertz. In such applications, the attenuator must settle to within 0.5 dB accuracy before each burst transmission, and the sub-100 ns switching ensures the attenuation is stable well within a 1 µs guard interval.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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