This part is a kind of semiconductor called BLF1820-90.

Function of this product has UHF power LDMOS transistor.

Manufacturers : Philips

Image and pinout :

Some of the text within the PDF file :

DISCRETE SEMICONDUCTORS DATA SHEET book, halfpage M3D379 BLF1820-90 UHF power LDMOS transistor Product specification Supersedes data of 2001 Mar 07 2003 Feb 10 Philips Semiconductors UHF power LDMOS transistor Product specification BLF1820-90 FEATURES • Typical 2-tone performance at a supply voltage of 26 V and IDQ of 500 mA: – Output power = 90 W (PEP) – Gain = 12 dB – Efficiency = 32% – dim = −26 dBc • Easy power control • Excellent ruggedness • High power gain • Excellent thermal stability • Designed for broadband operation (1800 to 2000 MHz) • Internally matched for ease of use. APPLICATIONS • RF power amplifiers for GSM, EDGE and CDMA base stations and multicarrier applications in the 1800 to 2000 MHz frequency range. PINNING PIN 1 2 3 DESCRIPTION d [ ... ]

BLF1820-90 PDF Datasheet Download