4271-52

Overview

The pSemi 4271-52 is an UltraCMOS RF switch IC designed for CATV applications. It features a Single-Pole Single-Throw (SPST) configuration with a 75 Ohm impedance, operating from 1 MHz to 3 GHz. The device utilizes Silicon technology and offers low insertion loss of 0.7 dB and high off-isolation of 63 dB typical. It operates within a temperature range of -40°C to +85°C and is available in a compact 6-DFN (3x3) surface-mount package.

Feature Summary

• Absorptive SPST architecture providing high isolation for CATV signal routing
• Optimized for 75 Ohm impedance systems to minimize signal reflection
• Single-line control interface simplifies digital logic integration
• UltraCMOS silicon technology ensures robust performance across wide frequency ranges

Applications

• CATV distribution networks
• RF signal switching in cable modems
• Broadband communication infrastructure
• Test and measurement equipment requiring 75 Ohm interfaces

Procurement Notes

Verify the specific suffix '52' corresponds to the 75 Ohm variant, as other suffixes may indicate different impedances or packages. Confirm RoHS compliance status through official manufacturer documentation prior to procurement. Ensure the 6-DFN footprint matches the target PCB design constraints. Cross-reference the datasheet revision date to ensure compatibility with current manufacturing standards.

Selection Notes

Select this component when a 75 Ohm impedance match is required for CATV or broadband applications. The absorptive nature of the switch makes it suitable for environments where high isolation is critical to prevent signal leakage. Consider the single-line control requirement for simplified driver circuitry compared to dual-control alternatives.

Part Context

The 4271-52 belongs to the UltraCMOS family of RF switches from pSemi. This series integrates advanced CMOS processes to deliver high linearity and low power consumption. The part is specifically engineered for the cable television industry, distinguishing itself from standard 50 Ohm switches by its specialized impedance matching for legacy and modern coaxial infrastructure.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.