DESCRIPTION The BD135 and BD139 are silicon epitaxial planar NPN transistors in Jedec SOT-32 plastic package, designed for audio amplifiers and drivers utilizing complementary or quasi compementary circuits. BD139 Marking, BD139 Datasheet Search Engine. BD139 Specifications. alldatasheet, free, Datasheets, databook. BD139 data sheet, Manual, BD139 parts, chips, ic, Electronic Components. application notes, selection guide. Request ON Semiconductor BD139: TRANS NPN 1.5A 80V HPWR TO225AA online from Elcodis, view and download BD139 pdf datasheet, Transistors (BJT) - Single specifications. BD139. Manufacturer Part Number. ON Semiconductor BD139 datasheet. If it's not shown correctly, Click here to open the file on a separate window. BD139 is a NPN transistor with a gain value of 40 to 160, this value determines the amplification capacity of the transistor. The BD139 was originally manufactured by Phillips rated at 160MHz for specific audio applications, later they were cloned by other manufacturers like Samsung, ST etc. View BD139 NPN SGS-Thomson.pdf from PHILOSOPHI 601116 at Uni Wien. BD135 BD139 NPN SILICON TRANSISTORS ¦ STMicroelectronics PREFERRED SALESTYPES DESCRIPTION The BD135 and BD139 are silicon Epitaxial Planar NPN transistors mounted in Jedec SOT-32 plastic