BLF188XRSU

Overview

The BLF188XRSU is a 1400 W LDMOS power transistor designed for broadcast and industrial applications in the HF to 600 MHz band. It features an earless flanged balanced ceramic package (SOT539B) with four leads. The device operates at a drain-source voltage of 50 V and delivers 1400 W output power with 24.4 dB gain and 73% efficiency at 108 MHz under pulsed RF conditions. Key electrical parameters include a drain-source breakdown voltage of 135 V, gate-source threshold voltage ranging from 1.25 V to 2.25 V, and a thermal resistance from junction to case of 0.10 K/W.

Feature Summary

• Integrated ESD protection
• Excellent ruggedness capable of withstanding high VSWR mismatches
• High efficiency and excellent thermal stability
• Easy power control

Applications

• Industrial, scientific and medical applications
• Broadcast transmitter applications

Procurement Notes

Verify the specific suffix 'SU' against official Ampleon documentation to confirm it corresponds to the SOT539B earless flanged package variant. Ensure compatibility with the required mounting hardware for the flanged design. Confirm RoHS compliance status matches Directive 2002/95/EC requirements for your region before finalizing procurement orders.

Selection Notes

Select this component for high-power broadband operations between HF and 600 MHz where extreme ruggedness is critical. The SOT539B package requires appropriate heat sinking solutions due to its flanged construction. Verify that the application circuit can handle the specified avalanche energy limits and impedance matching requirements for optimal performance.

Part Context

This part belongs to the BLF188XR series, which includes variants like BLF188XR (SOT539A) and BLF188XRU. The BLF188XRSU specifically utilizes the SOT539B earless flanged balanced ceramic package. It shares core electrical characteristics with other series members but differs in physical mounting configuration and lead arrangement.

Replacement Considerations

BLF188XR serves as a direct functional equivalent using the SOT539A package. BLF188XRU is another alternative within the same series. Verify pinout compatibility and mechanical dimensions when substituting these parts, as package differences may require adapter plates or modified PCB layouts.