STx715 And STx817 Series Bipolar Transistors
For Post-Voltage Regulation

STx715 Product Selector
STx817 Product Page

The new STx715 and STx817 series of rugged high performance transistors designed especially for linear-post-regulation applications, have just been introduced.

These transistors are available either in SMD SOT-223 and SOT-89 or through-hole TO-92 packages. A key parameter of these transistors is the excellent power dissipation. For example the STN715 packaged in SOT-223 exhibits an Rth lower than 78°C/Watt giving optimal power dissipation for transistors rated up to Ic =1A.

Another important characteristic is the high gain performance for all collector current requirements up to 1A.

The high gain characteristics offered by the STx715 and STx817 series reduce the input current requirement: as a consequence the lower input losses help minimize the total power dissipation.

Features

	Very low saturation voltage
	1A continuous collector current (Ic)
	High gain characteristics

Benefits

	Cost effective solution
	Both through-hole and SMD package options
	Excellent design flexibility

Applications

Almost all Consumer and Computer products are equipped with linear voltage post-regulation to supply the required low voltage bus (1.8V or 3.3V). Often the need to have these low voltages implies a high power dissipation that could be a design or cost limitation for integrated voltage regulators.

The STx715 and STx817 transistors result in an optimal choice from both a technical and economic point of view. Even for low power dissipation requirements and when no specific precision is requested (generally > ± 4%), these bipolar devices can be a cost-effective alternative.

NPN Types	PNP Types	Package	Ptot (W)					H FE Ic =1A VCE =2V	V CEsat Ic =1A IB =100mA	VCEO Ic =10mA
STN715	STN817A	SOT-223	1.6					>40	<0.5V	>80V
STF715	STF817A	SOT-89	1.4					>40	<0.5V	>80V
STX715	STX817A	TO-92	0.9					>40	<0.5V	>80V