The MMBT5551LT1G is an NPN bipolar junction transistor (BJT) produced by ON Semiconductor. Here is its detailed introduction:

Electrical Characteristics

• Voltage Ratings
• Collector-Emitter Voltage VCEO: The maximum collector-emitter breakdown voltage is 160V.
• Collector-Base Voltage VCBO: The maximum collector-base voltage is 180V.
• Emitter-Base Voltage VEBO: The maximum emitter-base voltage is 6V.
• Current Ratings
• Collector Current Ic: The maximum collector current is 600mA.
• Collector Cut-off Current Icbo: The collector cut-off current is 100nA.
• Power Dissipation: The power dissipation is 225mW.
• DC Current Gain (hFE): The DC current gain ranges from 80 to 250. For example, at 10mA and 5V, the minimum hFE is 80.
• Vce Saturation Voltage: The Vce saturation voltage is 200mV at 5mA and 50mA.
• Operating Temperature Range: The operating temperature range is -55°C to +150°C.

Package Information

• Package Type: It comes in a SOT-23 package, which is a surface mount package with 3 pins. It has a height of 1.11mm and a dimension of 2.90 x 1.30mm.

Features

• High Voltage Resistance: With a high collector-emitter breakdown voltage of 160V, it is suitable for applications that require high voltage resistance.
• Relatively High Current Capacity: The ability to handle a maximum collector current of 600mA makes it applicable in circuits that need to drive moderate loads.
• Low Saturation Voltage: The low Vce saturation voltage helps to reduce power consumption when the transistor is in the on state.
• Wide Temperature Range: The wide operating temperature range of -55°C to +150°C enables it to work stably in various harsh environments.
• Small Size: The SOT-23 package is small in size, which is suitable for applications where space is limited on the circuit board, facilitating high-density circuit layout.

Applications

• Amplifier Circuits: It can be used in low to medium frequency amplifier circuits, such as audio amplifiers and RF amplifiers, to amplify weak signals.
• Switching Circuits: It is often used as a switch in digital circuits and power control circuits to control the on and off of the circuit.
• Signal Processing: In signal processing circuits, it can be used to shape, filter and convert signals.
• General-Purpose Applications: It is suitable for a variety of general-purpose electronic circuits, such as in consumer electronics, industrial control, automotive electronics and other fields.