HMC941LP4TR

Overview

The HMC941LP4TR is a monolithic GaAs digital step attenuator from Analog Devices, housed in a compact 24-lead QFN package. It operates over a frequency range of 100 MHz to 33 GHz with a 50 Ohm impedance. The device provides 32 attenuation steps ranging from 0 dB to 15.5 dB using five-bit control logic with a 0.5 dB least significant bit resolution. Key electrical specifications include a maximum insertion loss of 5 dB and a typical return loss of 15 dB. It functions on a single 5 V supply and supports serial or parallel interface modes for control.

Feature Summary

• Monolithic GaAs construction ensures high reliability and consistent performance across the wide RF bandwidth.
• Compact surface-mount QFN-24 package facilitates integration into space-constrained wireless infrastructure designs.
• Flexible digital control interface allows selection between serial and parallel operation modes for system compatibility.

Applications

• Wireless base station transmit/receive path signal conditioning
• Point-to-point microwave radio link amplitude control
• Test and measurement equipment dynamic range adjustment

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm pinout and functional equivalence. Confirm RoHS compliance status and moisture sensitivity level requirements prior to PCB assembly planning. Ensure ESD protection protocols are followed during handling due to the sensitive GaAs die structure.

Selection Notes

Select this component when wideband attenuation up to 33 GHz is required with precise 0.5 dB step resolution. Compare insertion loss and power handling capabilities against alternative attenuators if higher output power is needed. Verify that the 5 V supply voltage aligns with the target system's power distribution architecture.

Part Context

This part belongs to the HMC941 family of digital step attenuators designed for high-frequency applications. It shares core architectural features with variants like the HMC941ALP4E but differs in packaging and reel configuration. The series is engineered for robust performance in demanding RF environments requiring stable attenuation characteristics.

Replacement Considerations

HMC941ALP4E is a documented equivalent variant within the same product family offering identical electrical performance in a different package style.