We only sell 100% Genuine MJ15003 and MJ15004 either individually or as a pair. These high power audio output devices are used in many high end audio devices so don't take a chance with cheap copies or fakes. Cricklewood Electronics have been an electronic component distributor since 1981 and only supply quality electronic components.

Motorola originally manufactured the MJ150__ range of high power transistors but in 1999 On Semiconductor took over manufacturing them for Motorola using their original designs and high standard of quality. 

The "G" suffix on the part number indicates they are lead free (RoHS compliant) and will replace a device without the "G".

MJ15003 spec 

NPN TO3 140V 20A 250W. Marked MJ15003G 

Genuine ON Semiconductor.

MJ15004 spec

PNP TO3 140V 20A 250W. Marked MJ15004G 

Genuine ON Semiconductor.