This part is a kind of semiconductor called BB151.
Function of this product has Low-voltage variable capacitance diode.
Manufacturers : Philipss
Image and pinout :

Some of the text within the PDF file :
DISCRETE SEMICONDUCTORS DATA SHEET alfpage M3D049 BB151 Low-voltage variable capacitance diode Preliminary specification 1999 May 12 Philips Semiconductors Preliminary specification Low-voltage variable capacitance diode FEATURES • Very low capacitance spread • Excellent linearity • Very small plastic SMD package • C3: 10.6 pF; ratio: 1.53 • Very low series resistance. 4 columns BB151 PINNING PIN 1 2 cathode anode DESCRIPTION k 1 a 2 APPLICATIONS • Voltage controlled oscillators (VCO). MAM130 DESCRIPTION The BB151 is a variable capacitance diode, fabricated in planar technology, and encapsulated in the SOD323 very small plastic SMD package. Marking code: PA. Cathode side indicated by a bar. Fig.1 Simplified outline (SOD323) and symbol. LIMITING VALUES In accord [ ... ]
BB151 PDF Datasheet Download
