2N5551 Amplifier NPN Transistor TO-92

2N5551 Pin Configuration Pin Number Pin Name Description 1 Emitter Current Drains out through emitter, normally connected to ground 2 Base Controls the biasing of transistor, Used to turn ON or OFF the transistor 3 Collector Current flows in through collector, normally connected to load Features and Specifications Amplifier NPN Transistor High DC Current Gain (hFE), typically 80 when IC=10mA Continuous Collector current (IC) is 600mA Collector-Emitter voltage (VCE) is 160 V Collector-Base voltage (VCB) is 180V Emitter Base Voltage (VBE) is 6V Transition Frequency is 100MHz Available in To-92 Package Note: Complete Technical Details can be found in the 2N5551 datasheet given at the end of this page. Where to use 2N5551 The 2N5551 is an NPN amplifier Transistor with an amplification factor (hfe) of 80 when the collector current is 10mA. It also has decent switching characteristics (Transition frequency is 100MHz) hence can amplify low-level signals. Due to this feature, the transistor is commonly used for amplification of audio or other low power signals. So if you are looking for an NPN transistor for you amplifier circuit, then this transistor might be the right choice. How to use 2N5551 As told earlier the 2N5551 NPN transistor is widely used for amplification. A very simple bare minimum circuit for a transistor to work as an amplifier is shown below. The simulation graph that shows the amplified output sine wave can also be found. Here the input sine wave of magnitude 8mV (yellow colour) is amplified to 50mV (Pink colour) as shown in the graph. In the above circuit the resistors R3 and R4 form a potential divider which decides the Emitter -Base voltage (V BE ). The Resistor R1 is the load resistor and the resistor R2 is the emitter resistor. Changing the value of R L will affect the amplification of the output wave. A transistor is normally a current amplifier, meaning the current flowing though the base will be amplified in the current flowing through the collector. This amplification depends on the amplification factor (h fe ) which is 80 for 2N5551. This means that the collector current will be amplified by 80 times than that of the base current. I c = βI b Another current that we have bring into consideration is the emitter current (I E ), but due to transistor action we assume that Emitter current is almost equal to the value of Collector current, however the difference between the both can be found with the value of α. Normally the value of collector current will e given by I E = I C + I B The output is obtained across the collector which is the Collector-Emitter voltage (V CE ). This output voltage depends on the Input voltage (Vcc, here 12V) without the voltage drop across the loads resistor (R1). Therefore the output voltage Vout can be given as Vout = VCE = (Vcc – IcRc) Applications Low power amplifiers Current amplifiers Small signal boosters Audio or other signal amplifiers Darlington pair 2N5551 Datasheet

The 2N5551 Transistor NPN is a semiconductor switching component for switching, amplification and power control circuits. It is a practical choice for your bill of materials or repair part list, and it is stocked at Most Electronics in Cairo with shipping to every governorate. 2N5551 Transistor NPN – Key Features • Through-hole or module package as listed • Suitable for switching and amplification • Check the datasheet for pinout and ratings Applications Makers, students and technicians use it in many kinds of projects, for example: • Power switching and motor control • Amplifier and driver stages • Power supply and inverter repair • Student labs and prototyping Usage Tips Check the pinout in the datasheet before soldering, use a heatsink at higher currents and protect inductive loads with a flyback diode. Why Buy from Most Electronics? Most Electronics is an electronics components store in Cairo serving engineers, students, makers and repair shops across Egypt. Every order is checked before it ships, prices are clear, and our team can help you choose compatible parts for your project. • Original and tested stock • Cash on delivery and fast shipping to all governorates • Pickup available from our Cairo branch • Technical support on WhatsApp before and after purchase Ordering, Delivery and Support Ordering from Most Electronics is simple. Add the item to your cart, choose home delivery or pickup from our Cairo branch, and pay cash on delivery or by the available online methods. Orders inside Cairo and Giza usually arrive within one to two working days, and shipments to other governorates normally take two to four working days depending on the courier. Every product is inspected before packing, and sensitive parts are packed in protective bags to prevent damage during shipping. If anything arrives faulty or different from what you ordered, contact our support team on WhatsApp and we will arrange a replacement according to our return policy. Not sure which part fits your project? Send us a message with your circuit or project idea and our engineers will help you choose compatible modules, power supplies, cables and accessories, so you can order everything you need in one go and start building right away. Package Includes 1 piece, as described in the product title and photos. 2N5551 Transistor NPN – Frequently Asked Questions Where can I buy it in Egypt? You can order it online from Most Electronics and pay on delivery, or collect it from our store in Cairo. Can I order more than one piece? Yes. Set the quantity you need in the cart; quantity discounts may apply on selected items.

2N5551 NPN Amplifier Transistor Pin Configuration: Pin Number Pin Name Description 1 Emitter Current Drains out through emitter, normally connected to ground 2 Base Controls the biasing of transistor, Used to turn ON or OFF the transistor 3 Collector Current flows in through collector, normally connected to load Features: Amplifier NPN Transistor High DC Current Gain (hFE), typically 80 when IC=10mA Continuous Collector current (IC) is 600mA Collector-Emitter voltage (VCE) is 160 V Collector-Base voltage (VCB) is 180V Emitter Base Voltage (VBE) is 6V Transition Frequency is 100MHz Available in To-92 Package Note: Complete Technical Details can be found at the? 2N5551?datasheet ?given at the end of this page. Alternative NPN Transistors: BC549, BC636, BC639,?BC547, 2N2369, 2N3055,?2N3904,?2N3906, 2SC5200 2N5551 Equivalent Transistors: NTE194, 2N5833, 2N5088, 2N3055, 2N5401 (PNP) Same Family Transistors: 2N5550 Where to use 2N5551: The? 2N5551? is an? NPN amplifier Transistor ?with an amplification factor (hfe) of 80 when the collector current is 10mA. It also has decent switching characteristics (Transition frequency is 100MHz) hence can amplify low-level signals. Due to this feature, the transistor is commonly used for amplification of audio or other low power signals. So if you are looking for an NPN transistor for you amplifier circuit then this transistor might be the right choice. How to use 2N5551: As told earlier the 2N5551 NPN transistor is widely used for amplification. A very simple bare minimum circuit for a transistor to work as an amplifier is shown below. The simulation graph that shows the amplified output sine wave can also be found. Here the input sine wave of magnitude 8mV (yellow colour) is amplified to 50mV (Pink colour) as shown in the graph.? In the above circuit the resistors R3 and R4 form a potential divider which decides the Emitter -Base voltage (V BE ). The Resistor R1 is the load resistor and the resistor R2 is the emitter resistor. Changing the value of R L ?will affect the amplification of the output wave. A transistor is normally a current amplifier, meaning the current flowing though the base will be amplified in the current flowing through the collector. This amplification depends on the amplification factor (h fe ) which is 80 for 2N5551. This means that the collector current will be amplified by 80 times than that of the base current. I c ?= ?I b Another current that we have bring into consideration is the emitter current (I E ), but due to transistor action we assume that Emitter current is almost equal to the value of Collector current, however the difference between the both can be found with the value of ?. Normally the value of collector current will e given by I E ?= I C ? I B The output is obtained across the collector which is the Collector-Emitter voltage (V CE ). This output voltage depends on the Input voltage (Vcc, here 12V) without the voltage drop across the loads resistor (R1). Therefore the output voltage Vout can be given as Vout = VCE = (Vcc ? IcRc) Applications: Low power amplifiers Current amplifiers Small signal boosters Audio or other signal amplifiers Darlington pair 2D model of the component: If you are designing a PCD or Perf board with this component then the following picture from the? 2N5551 Datasheet will be useful to know its package type and dimensions. ? Component Datasheet 2N5551 Datasheet