4257-52

Overview

The pSemi 4257-52 is an UltraCMOS SPDT RF switch IC designed for high-isolation, absorptive applications. It operates from 0 Hz to 3 GHz with a 50-ohm impedance. Key electrical parameters include a typical insertion loss of 1.2 dB and a typical off-isolation of 44 dB. The device utilizes Silicon technology and supports surface-mount installation. It functions within a temperature range of -40°C to +85°C and is available in a 20-QFN package.

Feature Summary

• SPDT configuration with absorptive architecture
• High isolation performance for signal integrity
• UltraCMOS technology for compact integration

Applications

• RF signal routing in communication systems
• Test and measurement instrumentation
• Wireless infrastructure components

Procurement Notes

Verify the specific ordering suffix to ensure the correct tape-and-reel quantity matches production requirements. Confirm that the 20-QFN footprint aligns with the PCB design guidelines provided in the datasheet. Check RoHS compliance status if environmental regulations apply to the final assembly. Ensure the operating temperature range meets the system's thermal constraints.

Selection Notes

Select this component when a single-pole double-throw switch is required for frequencies up to 3 GHz. The absorptive design offers superior isolation compared to reflective switches. Consider the 1.2 dB insertion loss impact on link budget calculations. The 20-QFN package size should be evaluated against available board space constraints.

Part Context

This part belongs to pSemi's UltraCMOS family of radio frequency switches. These devices are engineered for wireless communications and test equipment markets. The series emphasizes low power consumption and high linearity. The 4257-52 specifically targets applications requiring reliable signal switching between two paths.

Replacement Considerations

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