BLF578XRS,112

Overview

The Ampleon BLF578XRS is a 1400 W extremely rugged LDMOS power transistor designed for broadcast and industrial applications in the HF to 500 MHz band. It utilizes the XR process for enhanced durability without compromising RF performance. Typical pulsed performance at 225 MHz, 50 V supply, and 40 mA quiescent current yields 1400 W output power, 23.5 dB gain, and 69% efficiency. The device features integrated ESD protection and excellent thermal stability. It is housed in an earless flanged balanced ceramic package (SOT539B) with four leads.

Feature Summary

• Designed for broadband operation across the HF to 500 MHz frequency range
• Capable of withstanding severe load mismatch conditions corresponding to VSWR > 65:1 through all phases
• Features integrated electrostatic discharge (ESD) protection for improved handling reliability
• Optimized for easy power control and high efficiency in class-AB production test circuits

Applications

• Industrial, scientific and medical (ISM) applications
• Broadcast transmitter applications

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct package configuration. Confirm that the component meets RoHS compliance requirements as specified in the product data sheet. Ensure proper ESD handling precautions are observed during storage and installation to prevent damage to the sensitive internal circuitry.

Selection Notes

Select this component for high-power applications requiring extreme ruggedness and reliable performance under severe operating conditions. Consider the SOT539B package dimensions and mounting requirements when designing the thermal management system. Verify that the application operates within the specified voltage and temperature limits to maintain optimal efficiency and longevity.

Part Context

The BLF578XRS is an enhanced version of the BLF578, incorporating Ampleon's XR process technology. This advancement provides maximum ruggedness capability while maintaining high RF performance standards. It serves as a robust solution for demanding broadcast and industrial environments where reliability under stress is critical.

Replacement Considerations

The BLF578XR is the flanged balanced counterpart with two mounting holes. Both devices share identical electrical specifications and are part of the same XR process family. Substitution should be verified based on mechanical mounting constraints and PCB layout compatibility.