BF1108/L,215

Overview

The BF1108/L,215 is a silicon RF switch combining a depletion-type FET and a band-switching diode in an SOT-143B package. It provides low insertion loss of up to 2 dB and high off-state isolation of at least 30 dB up to 1 GHz. The device features integrated protection diodes between gate-source and gate-drain to guard against voltage surges. Key electrical parameters include a drain-source on-state resistance of 12 to 20 Ω and a gate-source pinch-off voltage of -3 to -4 V.

Feature Summary

• Combines a depletion-type FET with a band-switching diode for efficient RF switching
• Provides low signal loss and high isolation capabilities across the frequency range
• Includes integrated protection diodes to prevent damage from excessive input voltage surges

Applications

• Passive loop through circuits for VCR tuners
• Transceiver switching applications

Procurement Notes

Verify the specific ordering suffix /L,215 against official NXP documentation to confirm packaging details and availability status. Ensure the component matches the SOT-143B package outline and pin configuration described in the datasheet. Confirm that the device meets the required ESD handling precautions during transport and assembly processes.

Selection Notes

Select this component for designs requiring reliable RF switching up to 1 GHz with minimal signal degradation. Consider the integrated surge protection when operating in environments prone to voltage spikes. Evaluate the thermal resistance characteristics if the application involves significant power dissipation or elevated ambient temperatures.

Part Context

This part belongs to NXP's silicon RF switch portfolio, designed specifically for low-loss performance in radio frequency applications. It serves as a compact solution for managing signal paths in consumer electronics and communication systems where space constraints and signal integrity are critical design factors.

Replacement Considerations

BF1108R: Plastic surface-mounted package with reverse pinning; verify pin compatibility before substitution.