BUL741

BUL741 BUL741FP High voltage fast-switching NPN power transistors Features ■ High voltage capability ■ Low spread of dynamic parameters ■ Minimum lot-to-lot spread for reliable operation ■ Very high switching speed Applications ■ Electronic ballast for fluorescent lighting ■ Switch mode power supplies. Description The devices are manufactured using high voltage multi-epitaxial planar technology for high switching speeds and high voltage capability. Thanks to an increased intermediate layer, it has an intrinsic ruggedness which enables the transistor to withstand an high collector current level during breakdown condition, without using the transil protection usually necessary in typical converters for lamp ballast. 3 2 1 TO-220 3 2 1 TO-220FP Figure 1. Internal schematic diagram Table 1. Device summary Order codes Marking BUL741 BUL741 BUL741FP BUL741FP Packages TO-220 TO-220FP August 2009 Doc ID 13406 Rev 3 Packaging Tube Tube 1/12 www.st.com 12 Contents Contents BUL741, BUL741FP 1 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 Typical characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 Package mechanical data . . . ...