DDTD142TU-7

DC Current Gain (hFE) (Min) @ Ic, Vce:	100 @ 5mA, 5V
Base Part Number:	DTD142
Supplier Device Package:	SOT-323
Package / Case:	SC-70, SOT-323
Mounting Type:	Surface Mount
Power - Max:	200mW
Frequency - Transition:	200MHz
Current - Collector Cutoff (Max):	500nA (ICBO)
Vce Saturation (Max) @ Ib, Ic:	300mV @ 2.5mA, 50mA
Series:	--
Resistor - Base (R1):	470 Ohms
Voltage - Collector Emitter Breakdown (Max):	50V
Current - Collector (Ic) (Max):	500mA
Transistor Type:	NPN - Pre-Biased
Moisture Sensitivity Level (MSL):	--
Part Status:	Discontinued at Digi-Key
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction To DDTD142TU-7

The DDTD142TU-7 is a single-stage pre-biased transistor specifically designed for applications ranging from battery-powered audio solutions to regulated DC/DC converters and power management systems. It is an N-channel enhancement-mode transistor manufactured with Toshiba’s advanced BiCMOS process, combining the high-speed performance of a bipolar transistor and the low off-state leakage of an MOSFET to provide the best of both worlds. Thanks to its low power consumption, this device is well suited for use in compact, portable electronics.

Application Fields

The DDTD142TU-7 can be utilized in a multitude of power management applications. It can be used as a high-speed switch in a battery-powered audio solution, controlling the connection between a sound source and an amplifier. It can also be utilized in DC/DC converters to reduce the output voltage ripple, or as a high-frequency chopper switch in DC-DC isolated converters to control the connection between the two isolated circuits. Apart from power management applications, the DDTD142TU-7 can be used in portable battery-powered LED lighting solutions as a switch for LED current optimization, or as a switch for regulating the voltage or current of the input.

Working Principle

The DDTD142TU-7 operates on the bipolar junction transistor (BJT) principle. When used in its pre-biased state, the device acts as a high-speed switch that controls the connection between the source and the ground. In a typical application, a low voltage is applied to the base of the device to ensure that carrier transport at the emitter junction is sufficient to render the device \'on\'. In this condition, the device can control the connection between a source and a ground, allowing current to flow from the source to the ground when it is on, and stopping the current flow when it is off. The device is also capable of switching at high frequencies, leading to the possibility of utilizing it in DC/DC converters to reduce the output voltage ripple and in high-frequency chopper switches for DC-DC isolated converters for improved efficiency. For example, when used in DC-DC isolated converters, the device can be operated at high frequencies such that the chopper switch acts like a diode, allowing the current to flow from the input line to the output, and preventing the current from flowing from the output back to the input line.

Conclusion

In conclusion, the DDTD142TU-7 is an advanced single-stage pre-biased transistor that is designed for applications ranging from battery-powered audio solutions to DC/DC converters and power management systems. It operates on the bipolar junction transistor (BJT) principle, where a low voltage is applied to its base to ensure that carrier transport is sufficient to render the device ‘on’. Through its switching capability at high frequencies, the device can be utilized in DC/DC converters to reduce the output voltage ripple and in DC-DC isolated converters to improve the converter’s efficiency.

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