Transistor 2N3906

The 2N3906 Transistor PNP 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. 2N3906 Transistor PNP – 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. 2N3906 Transistor PNP – 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.

2N3906 Pin Configuration Pin Number Pin Name Description 1 Emitter Current Drains out through emitter 2 Base Controls the biasing of transistor 3 Collector Current flows in through collector Features Bi-Polar PNP Transistor DC Current Gain (hFE) is 300 maximum Continuous Collector current (IC) is 200mA Emitter Base Voltage (VBE) is 5V Base Current(IB) is 5mA maximum Collector Emitter Voltage (VCE) is 40V Collector Base Voltage (VCB) is 40V Available in To-92 Package Note: Complete Technical Details can be found at the 2N3906 datasheet given at the end of this page. Brief Description on 2N3906 2N3906 is a PNP transistor hence the collector and emitter will be closed (Forward biased) when the base pin is held at ground and will be opened (Reverse biased) when a signal is provided to base pin. This is where a PNP transistor differs from a NPN transistor, a Logic state (blue colour) is used to toggle between Ground and Signal Voltage (Emitter-Base Voltage VBE) as shown below 2N3906 has a gain value of 110 to 300, this value determines the amplification capacity of the transistor. The maximum amount of current that could flow through the Collector pin is 200mA, hence we cannot connect loads that consume more than 200mA using this transistor. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 5mA. When this transistor is fully biased then it can allow a maximum of 200mA to flow across the collector and emitter. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (V­CE) or Base-Emitter (VBE) could be 40 and 5 V respectively. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around 5V. Where to use 2N3906 The 2N3906 is a commonly used PNP transistor. It very much similar to the bc557 transistor except for that it has high collector to emitter voltage and hence high voltage loads can be toggled. This transistor has only a gain value of 300, hence not suitable for amplifier circuits. So if you looking for a PNP transistor that could switch high voltage loads within 0.2A then this 2N3906 transistor might be the right choice for you. How to use 2N3906 The 2N3906 transistor is commonly used as a switching device. When used as a switch, it can be operated in saturation region and cut-off region. In PNP transistor, by default it’s in ON state, but not to be said perfectly ON until the base pin is not grounded. If we provide ground to the base pin then the transistor will be in reverse biased and said to be turn ON. If supply is provided to the base pin it stops conducting current between emitter and collector and said to be in OFF state. For the protection of transistor a resistance added in series with it. For finding the value of that resistor you can use the formula: RB = VBE / IB Where, the value of VBE will be 5v for this transistor. The maximum value of providing base current is 200mA. So, from that you can find the value of resistance to be added in series with it. In the below circuit the base emitter voltage (VBE) is 0V (Grounded) hence the PNP transistor conducts and the motor rotates. If made high (5V) the motor will stop rotation. Note that for PNP transistors the loads should be connected in the collector side as shown below. Also note that the load current should be less than 200mA (here 140ma) Applications Used to switch high voltage low current loads Optimal for loads with high peak voltage upto 40V It is used in the various switching applications. Used in inverter and converter circuits Used for making siren or dual Led or Lamp flasher. Can be used in Darlington Pair. 2N3906 Datasheet

Pin Configuration: Pin Number Pin Name Description 1 Emitter Current Drains out through emitter 2 Base Controls the biasing of transistor 3 Collector Current flows in through collector Features: Bi-Polar PNP Transistor DC Current Gain (hFE) is 300 maximum Continuous Collector current (IC) is 200mA Emitter Base Voltage (VBE) is 5V Base Current(IB) is 5mA maximum Collector Emitter Voltage (VCE) is 40V Collector Base Voltage (VCB) is 40V Available in To-92 Package Note: Complete Technical Details can be found at the 2N3906 datasheet given at the end of this page. 2N3906 Equivalent Transistors: 2N4403, MPSA13, MPSA92, MPSA55, ZTX555 Alternative for 2N3906: BC157, BC558 , 2SA1943 , BD140 , S8550 , TIP127, TIP42 Brief Description on 2N3906: 2N3906 is a PNP transistor hence the collector and emitter will be closed (Forward biased) when the base pin is held at ground and will be opened (Reverse biased) when a signal is provided to base pin. This is where a PNP transistor differs from a NPN transistor, a Logic state (blue colour) is used to toggle between Ground and Signal Voltage (Emitter-Base Voltage VBE) as shown below 2N3906 has a gain value of 110 to 300, this value determines the amplification capacity of the transistor. The maximum amount of current that could flow through the Collector pin is 200mA, hence we cannot connect loads that consume more than 200mA using this transistor. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 5mA. When this transistor is fully biased then it can allow a maximum of 200mA to flow across the collector and emitter. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (V­CE) or Base-Emitter (VBE) could be 40 and 5 V respectively. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around 5V. Where to use 2N3906: The 2N3906 is a commonly used PNP transistor. It very much similar to the bc557 transistor except for that it has high collector to emitter voltage and hence high voltage loads can be toggled. This transistor has only a gain value of 300, hence not suitable for amplifier circuits. So if you looking for a PNP transistor that could switch high voltage loads within 0.2A then this 2N3906 transistor might be the right choice for you. How to use 2N3906: The 2N3906 transistor is commonly used as a switching device. When used as a switch, it can be operated in saturation region and cut-off region. In PNP transistor, by default it’s in ON state, but not to be said perfectly ON until the base pin is not grounded. If we provide ground to the base pin then the transistor will be in reverse biased and said to be turn ON. If supply is provided to the base pin it stops conducting current between emitter and collector and said to be in OFF state. For the protection of transistor a resistance added in series with it. For finding the value of that resistor you can use the formula: RB = VBE / IB Where, the value of VBE will be 5v for this transistor. The maximum value of providing base current is 200mA. So, from that you can find the value of resistance to be added in series with it. In the below circuit the base emitter voltage (VBE) is 0V (Grounded) hence the PNP transistor conducts and the motor rotates. If made high (5V) the motor will stop rotation. Note that for PNP transistors the loads should be connected in the collector side as shown below. Also note that the load current should be less than 200mA (here 140ma) Applications Used to switch high voltage low current loads Optimal for loads with high peak voltage upto 40V It is used in the various switching applications. Used in inverter and converter circuits Used for making siren or dual Led or Lamp flasher. Can be used in Darlington Pair. 2D-Model 2D dimensions will help you in placing this component at the time of making circuit on perf board or a PCB. Component Datasheet 2N3906 Datasheet

PNP General Purpose