BLF640U

Overview

The BLF640 is a 10 W LDMOS power transistor designed for applications operating at frequencies from HF to 2200 MHz. It utilizes a ceramic surface-mounted package (SOT538A) with two leads and features an integrated ESD protection circuit. The device operates with a drain-source voltage of 28 V and includes no internal matching network, facilitating broadband operation. Typical performance metrics include a power gain of 19.3 dB and a drain efficiency of 31% under 1-carrier W-CDMA test conditions.

Feature Summary

• Integrated electrostatic discharge protection
• Excellent ruggedness in class-AB operation
• High efficiency and thermal stability
• No internal matching required for broadband use

Applications

• RF power amplifiers for the HF to 2200 MHz frequency range
• Broadcast drivers

Procurement Notes

Verify the component against the official Ampleon datasheet revision 3 dated September 1, 2015. Confirm that the physical package matches the SOT538A ceramic surface-mount specification. Ensure the ordering information aligns with the manufacturer's current product status before finalizing acquisition.

Selection Notes

Select this component for designs requiring a 10 W output capability within the HF to 2200 MHz spectrum. Consider the 3.2 K/W junction-to-case thermal resistance when designing the heat dissipation system. Verify that the application environment accommodates the specified maximum junction temperature limits.

Part Context

This part belongs to the BLF series of broadband power LDMOS transistors manufactured by Ampleon. It serves as a high-performance active element for RF signal amplification. The device represents a specific configuration optimized for linear amplification tasks across wide bandwidths without external matching networks.

Replacement Considerations

Consult the official Ampleon documentation for verified substitute part numbers. Do not assume cross-compatibility with other manufacturers' devices based on generic specifications alone.