BLF147,112

Overview

The BLF147,112 is a silicon N-channel enhancement mode vertical D-MOS transistor designed for VHF power applications. Encapsulated in the SOT121B flange package with a ceramic cap, it features four isolated leads and supports a drain-source voltage of up to 65 V. The device delivers 150 W PEP at 28 MHz in Class-AB operation and 150 W CW at 108 MHz in Class-B operation. It exhibits high power gain exceeding 17 dB, low intermodulation distortion below -30 dB, and robust thermal stability capable of withstanding full load mismatch conditions.

Feature Summary

• High power gain and low intermodulation distortion for signal fidelity
• Robust ruggedness capable of withstanding full load mismatch
• Positive temperature coefficient for easy parallel operation and thermal stability
• Matched pair availability indicated by gate-source voltage marking codes

Applications

• Industrial and military applications in the HF/VHF frequency range
• SSB linear amplification in radio transceivers
• CW transmission systems operating in the VHF band

Procurement Notes

Verify the component authenticity against the official NXP Semiconductors datasheet specifications. Confirm the SOT121B flange package integrity and check for the specific gate-source voltage group marking code required for matched pair assembly. Ensure handling procedures account for the beryllium oxide content within the ceramic cap to prevent exposure to toxic materials during installation or disposal.

Selection Notes

Select this transistor for VHF applications requiring high linearity and ruggedness under mismatched load conditions. Consider the SOT121B flange package for efficient heat dissipation via mounting base contact. Evaluate the need for matched pairs based on the provided VGS group limits if balanced circuit topologies are utilized. Ensure the drive circuitry accommodates the specified threshold voltage ranges for the selected group.

Part Context

Originally released by Philips Semiconductors and subsequently managed by NXP Semiconductors, the BLF147 belongs to a lineage of VHF power MOS transistors. The transition from Philips to NXP branding is documented in the datasheet revision history. This component represents a mature technology solution for high-power VHF amplification, distinct from newer LDMOS or GaN technologies found in later product lines.

Replacement Considerations

Consult official NXP Semiconductors documentation for direct replacements. Cross-reference pinouts and thermal resistance values when considering alternative VHF power MOS transistors. Verify that any substitute device meets the 65 V drain-source voltage rating and SOT121B mechanical dimensions.