DDA143TK-7-F

DC Current Gain (hFE) (Min) @ Ic, Vce:	100 @ 1mA, 5V
Base Part Number:	DDA143
Supplier Device Package:	SOT-26
Package / Case:	SOT-23-6
Mounting Type:	Surface Mount
Power - Max:	300mW
Frequency - Transition:	250MHz
Current - Collector Cutoff (Max):	--
Vce Saturation (Max) @ Ib, Ic:	300mV @ 250µA, 2.5mA
Series:	--
Resistor - Emitter Base (R2):	--
Resistor - Base (R1):	4.7 kOhms
Voltage - Collector Emitter Breakdown (Max):	50V
Current - Collector (Ic) (Max):	100mA
Transistor Type:	2 PNP - Pre-Biased (Dual)
Part Status:	Active
Packaging:	Tape & Reel (TR)

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The DDA143TK-7-F is a bit of an obscure part when it comes to transistors. Its primary application is the switch between a pullup resistor and an external pullup in a low-side switch configuration. The DDA143TK-7-F is also used in conjunction with an external pullup to control a logic signal in a bi-directional amplifier. This type of array is called a Pre-Biased Array, and it is essential for applications that require the fast switching of small signals and the protection of delicate circuits.The DDA143TK-7-F is based on a standard Bipolar Junction Transistor (BJT) array. It consists of two NPN and two PNP transistors in an 8-lead dual-in-line package. Each transistor is arranged in a Darlington configuration. This arrangement offers the highest possible gain, while maintaining low input bias current and low crossover distortion.The key to the operation of the DDA143TK-7-F is the Pre-Biased configuration of the transistors. Pre-Biasing basically means that the transistors are configured such that there is a voltage present across the base-emitter junction of the NPN transistor, and vice versa for the PNP transistor. This is achieved by adding a series of resistors in the base connection of the transistor.The Pre-Biased configuration of the DDA143TK-7-F can be used to switch a logic signal between two states. When the logic signal is low, the PNP transistor is on and the NPN transistor is off, and vice versa when the logic signal is high. This allows for fast switching of the logic signal, while preserving the low input bias current and low crossover distortion.The DDA143TK-7-F also has the ability to protect delicate circuits from damage due to excessive current. When excessive current is present, the PNP and NPN transistors in the array turn on, thereby limiting the current flow through the logic signal. This protection is essential in applications where high levels of current could cause damage to the delicate circuitry.The DDA143TK-7-F is an ideal choice for those applications which require fast switching, low input bias current, and protection from excessive current. Its Pre-Biased configuration makes it especially useful for those applications that need to switch small levels of signals quickly and reliably. Its ease of use and flexibility make it a great choice for any application which requires combining fast switching with low input bias current and protection from excessive current.

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