DMMT5551S-7-F Discrete Semiconductor Products

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Transistor Type:	2 NPN (Dual) Matched Pair
Current - Collector (Ic) (Max):	200mA
Voltage - Collector Emitter Breakdown (Max):	160V
Vce Saturation (Max) @ Ib, Ic:	200mV @ 5mA, 50mA
Current - Collector Cutoff (Max):	50nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	80 @ 10mA, 5V
Power - Max:	300mW
Frequency - Transition:	300MHz
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	SOT-23-6
Supplier Device Package:	SOT-26
Base Part Number:	DMMT5551

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The DMMT5551S-7-F is a general-purpose bipolar junction transistor (BJT) array manufactured by Fairchild Semiconductor. It is designed to perform up to three simultaneous functions depending on the application. The DMMT5551S-7-F is available in an 8-lead Small-Outline Integrated Circuit (SOIC) package which makes it an ideal choice for high-density circuit board applications.The DMMT5551S-7-F is a three-branch network of NPN transistors. Each branch circuit consists of two NPN transistors having different current gain characteristics. The first branch consists of a higher gain NPN transistor, the second branch consists of two lower gain NPN transistors in parallel, and the third branch consists of two lower gain NPN transistors in tandem. As a result, the current gains of each branch vary, allowing for a broad range of functions that can be performed with a single device.The DMMT5551S-7-F can be used to perform three basic functions depending on the application. First, it can be used as a three-pole switch, allowing for multiple switching operations within the same device. Second, it can be used as a voltage-controlled amplifier, with the current gain of each branch being adjusted by a control voltage. Third, it can be used to create a pseudo-S/H (sample/hold) circuit, allowing for constant output levels across multiple input cycles.The versatile DMMT5551S-7-F has many applications in the field of electronics. It is used in various data conversion, logic, and switching circuits. It is also used in multiplexers, digital logic circuits, analog amplifiers, sample-and-hold amplifiers, voltage followers, and inverters.The working principle of the DMMT5551S-7-F is based on a three-branch network of NPN transistors. When a current flows through each branch, it produces a voltage drop that is determined by the current gain of the branch’s transistors. This voltage drop can then be used to control the current gain of the other two branches, allowing for different functions to be performed by the device.For example, when used as a three-pole switch, the voltage drop across each branch can be adjusted to close or open the switch. When used as a voltage-controlled amplifier, the adjustment of the current gain of the high-gain branch will affect the overall current gain of the amplifier. And when used as a sample-and-hold circuit, the voltage drop across each branch can be used to sample the signal and then hold it in a register.In summary, the DMMT5551S-7-F is a general-purpose bipolar junction transistor array that offers a wide range of applications. Its working principle is based on a three-branch network of NPN transistors, and it can be used as a three-pole switch, a voltage-controlled amplifier, and a sample-and-hold circuit. By combining its various functions, the DMMT5551S-7-F can provide maximum flexibility for any given project.

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