BLF521,112

Overview

The BLF521,112 is a silicon N-channel enhancement mode vertical D-MOS transistor designed for UHF communications transmitter applications. It operates in the 0.1 GHz to 1.4 GHz range with a drain-source voltage of 40 V and delivers up to 2 W output power at 500 MHz. The device features high power gain exceeding 10 dB and drain efficiency above 50% in Class-B operation. Packaged in a studless SOT172D ceramic package with four isolated leads, it includes gold metallization and withstands full load mismatch conditions.

Feature Summary

• High power gain and easy power control capabilities
• Gold metallization for enhanced reliability
• Good thermal stability characteristics
• Designed for broadband operation across UHF frequencies
• Capable of withstanding full load mismatch

Applications

• Communications transmitter applications in the UHF frequency range
• Broadband RF amplifier circuits
• Class-B linear amplification stages

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm RoHS compliance status as indicated in ordering information. Ensure handling procedures account for beryllium oxide content within the ceramic package. Validate that the specific suffix matches the required electrical grouping limits before integration into production designs.

Selection Notes

Select this component for UHF transmitter designs requiring robust performance under mismatched load conditions. Consider the SOT172D package constraints for thermal management and mounting requirements. Evaluate gate-source threshold voltage groupings to ensure compatibility with specific biasing networks. Verify frequency coverage aligns with the intended operational bandwidth between 100 MHz and 1400 MHz.

Part Context

This device belongs to Ampleon's portfolio of UHF power MOS transistors, originally developed under Philips Semiconductors. It represents a specialized solution for broadband communication systems operating in the Ultra High Frequency spectrum. The product line emphasizes ruggedness and thermal stability for demanding transmitter environments.

Replacement Considerations

Consult official substitution lists for equivalent LDMOS or D-MOS devices from Ampleon. Verify pinout compatibility and thermal resistance values when considering alternative packages. Ensure replacement components meet the same VSWR tolerance and frequency range specifications.

FAQ

What is the maximum drain-source voltage rating?

The absolute maximum drain-source voltage (VDS) is rated at 40 V.

Does the device support broadband operation?

Yes, the BLF521 is specifically designed for broadband operation across the UHF frequency range.

What safety precaution is required for the package material?

The package contains beryllium oxide; the BeO disc must not be damaged during handling or disposal.