This part is a kind of semiconductor called BLF244.

Function of this product has VHF power MOS transistor.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

DISCRETE SEMICONDUCTORS DATA SHEET BLF244 VHF power MOS transistor Product specification September 1992 Philips Semiconductors Product specification VHF power MOS transistor FEATURES • High power gain • Low noise figure • Easy power control • Good thermal stability • Withstands full load mismatch • Gold metallization ensures excellent reliability. g d k, halfpage BLF244 PIN CONFIGURATION 1 4 DESCRIPTION Silicon N-channel enhancement mode vertical D-MOS transistor designed for large signal amplifier applications in the VHF frequency range. The transistor is encapsulated in a 4-lead SOT123 flange envelope, with a ceramic cap. All leads are isolated from the flange. Matched gate-source voltage (VGS) groups are available on request. PINNING - SOT123 PIN 1 2 3 4 drain so [ ... ]

BLF244 PDF Datasheet Download