{"id":291976,"date":"2025-08-25T12:41:55","date_gmt":"2025-08-25T07:11:55","guid":{"rendered":"https:\/\/www.aakash.ac.in\/blog\/?p=291976"},"modified":"2025-08-26T17:14:13","modified_gmt":"2025-08-26T11:44:13","slug":"what-is-pnp-transistor","status":"publish","type":"post","link":"https:\/\/www.aakash.ac.in\/blog\/what-is-pnp-transistor\/","title":{"rendered":"What is PNP Transistor\u200b? Definition, Working, Symbols and More"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">If you ever open a radio, amplifier, or many kinds of digital devices, you will see small black parts with three legs\u2014these are transistors. In the world of electronics, transistors are considered the heart of almost every electronic circuit.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">One important type is the PNP transistor. What does it do, how does it work, and where is it used? This blog will explain everything you need to know about a PNP transistor in clear and simple English, so anyone can understand\u2014even if you\u2019re just starting out in electronics.<\/span><\/p>\n<h2><strong>What Is a Transistor?<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">A transistor is a semiconductor device used in almost all modern electronics to switch, amplify, or regulate electrical signals. It usually has three key parts, called terminals:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Emitter (E)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Base (B)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Collector \u00a9<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">There are two main types of transistors:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bipolar Junction Transistors (BJTs)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Field Effect Transistors (FETs)<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Our main focus here is the BJT, and specifically, the PNP type.<\/span><\/p>\n<h2><strong>What Is a PNP Transistor?<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">A PNP transistor is a type of Bipolar Junction Transistor. The name comes from its structure:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u201cP\u201d stands for a region made of p-type semiconductor (positive, with extra \u201choles\u201d or absence of electrons).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u201cN\u201d is a region made of n-type semiconductor (negative, with extra electrons).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The letters show how the three layers are arranged: P-type, N-type, and P-type again (P-N-P).<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">So, a PNP transistor consists of a thin N-type layer sandwiched between two thicker P-type layers. This structure gives it special properties and allows current to flow in a certain way.<\/span><\/p>\n<h2><strong>Parts of a PNP Transistor<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Let\u2019s look at each part:<\/span><\/p>\n<h3><strong>1. Emitter (E)<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Supplies the main charge carriers (for PNP, these are holes).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Heavily \u201cdoped,\u201d which means it has a lot of charge carriers (holes).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Always forward-biased (positively charged) with respect to the base, so it easily sends charge carriers into the base.<\/span><\/li>\n<\/ul>\n<h3><strong>2. Base (B)<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Very thin and lightly doped layer.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Acts as the gate of the transistor: it controls how many charge carriers move from emitter to collector.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">In a PNP transistor, this is made from N-type semiconductor, so there are not as many electrons.<\/span><\/li>\n<\/ul>\n<h3><strong>3. Collector (C)<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Collects the charge carriers (holes) that pass through the base.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Also heavily doped and larger than the emitter, but not as heavily as the emitter.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Usually reverse-biased (negatively charged) with respect to the base, so it has a strong attraction for the charge carriers.<\/span><\/li>\n<\/ul>\n<h2><strong>The Symbol of a PNP Transistor<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">The symbol for a PNP transistor shows an arrow on the emitter leg, pointing into the base. This arrow shows the direction of \u201cconventional\u201d current (from positive to negative), which for a PNP transistor is from emitter to base.<\/span><\/p>\n<h2><strong>How Does a PNP Transistor Work?<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">The PNP transistor works by using small changes in the base current to control a much larger current that flows from emitter to collector.<\/span><\/p>\n<h3><strong>Basic Principle<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Forward Bias: The emitter-base junction is connected so that the emitter is positive compared to the base.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Reverse Bias: The base-collector junction is connected so that the collector is negative compared to the base.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">When a small current flows out of the base (from base to ground), it allows a much larger current to flow from the emitter to the collector.<\/span><\/li>\n<\/ul>\n<h3><strong>Detailed Step-by-Step Working<\/strong><\/h3>\n<p><b>Applying Voltage<\/b><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">The positive terminal of the power supply is connected to the emitter.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">The negative terminal of the power supply is connected to the base.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">This creates a forward bias at the emitter-base junction.<\/span><\/li>\n<\/ul>\n<p><b>Charge Carrier Movement<\/b><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">The forward bias causes the emitter to inject holes (majority carriers in PNP) into the base.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">The base is thin and has few electrons. Most \u201choles\u201d do not recombine in the base; instead, they keep moving into the collector layer.<\/span><\/li>\n<\/ul>\n<p><b>Collector Action<\/b><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">The collector, being reverse biased, attracts these holes.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">So, a large current flows from emitter \u2192 base \u2192 collector.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\"><strong>Current Flow:<\/strong> <\/span><span style=\"font-weight: 400;\">Usually, the collector current is the largest part; the base current is a tiny fraction.<\/span><\/p>\n<p><b>Amplification<\/b><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">Because a small change in base current controls a much larger collector current, the transistor amplifies signals.<\/span><\/li>\n<\/ul>\n<h2><strong>Direction of Current in a PNP Transistor<\/strong><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Conventional Current<\/b><span style=\"font-weight: 400;\">: Flows from emitter to collector. This is opposite to the flow in an NPN transistor (which flows from collector to emitter).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Base Current<\/b><span style=\"font-weight: 400;\">: In PNP, the base current flows out of the base (from base to ground).<\/span><\/li>\n<\/ul>\n<h2><strong>Construction of a PNP Transistor<\/strong><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The base (N-type) is very thin and lightly doped.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The emitter and collector (P-type) are heavily doped with more holes, so they can supply and collect more charge carriers.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The depletion region between the emitter and base is very narrow (because it\u2019s forward biased), while the collector-base junction has a wider depletion region (because it\u2019s reverse biased).<\/span><\/li>\n<\/ul>\n<h2><strong>Characteristics of PNP Transistors<\/strong><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Current direction: From emitter (P-type) to collector (P-type) through the thin base layer (N-type).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">On-State: The PNP transistor is ON when no current flows into the base (instead, current must flow out of the base). This is the opposite of NPN, which is ON when a current flows into the base.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Amplifies or switches signals: Small base current controls large collector-emitter current, so it works as an amplifier or as a switch.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Majority Charge Carrier: Holes are the main charge carriers for PNP.<\/span><\/li>\n<\/ul>\n<h2><strong>PNP vs NPN Transistor: What\u2019s the Difference?<\/strong><\/h2>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Feature<\/span><\/td>\n<td><span style=\"font-weight: 400;\">NPN Transistor<\/span><\/td>\n<td><span style=\"font-weight: 400;\">PNP Transistor<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Layers<\/span><\/td>\n<td><span style=\"font-weight: 400;\">N-P-N<\/span><\/td>\n<td><span style=\"font-weight: 400;\">P-N-P<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Main charge carrier<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Electrons<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Holes<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Current direction<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Collector \u2192 Emitter<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Emitter \u2192 Collector<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Powering \u201cON\u201d<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Current into base<\/span><\/td>\n<td><span style=\"font-weight: 400;\">No current into base (current out)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Symbol arrow<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Points out of the emitter<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Points into the emitter<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Common use<\/span><\/td>\n<td><span style=\"font-weight: 400;\">More common for most applications<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Used when negative voltage needs switching<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><strong>Types of PNP Transistors<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">PNP transistors come in different types based on application:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Small-signal PNP: used in low-power signal amplification.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Power PNP: designed for switching and controlling larger currents.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Darlington PNP: two transistors combined for extra amplification.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Schottky PNP: for high-speed applications.<\/span><\/li>\n<\/ul>\n<h2><strong>Key Properties and Parameters<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">When you pick a PNP transistor for your circuit, you should consider:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Voltage rating: Maximum voltage it can handle between collector and emitter.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Current rating: Max collector current.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Gain (\u03b2): How much amplification: typically between 20 and 200 or more.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Power Dissipation: Maximum heat it can handle, beyond which it can be damaged.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Frequency Response: How well it works at different speeds (frequencies).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Saturation\/Cut-off: Whether it is fully ON or OFF, it is important for switching applications.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">How to Use a PNP Transistor?<\/span><\/h2>\n<p><b> As a Switch<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">When used as a switch, the PNP transistor turns ON when a low signal (relative to the emitter) is applied to the base.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">It can control devices like LEDs, motors, and relays.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Its OFF-state is when there\u2019s no voltage difference between emitter and base; the ON-state is when the base is at a lower voltage.<\/span><\/li>\n<\/ul>\n<p><b> As an Amplifier<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Used to boost weak audio, radio, or sensor signals.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Common in audio amplifiers and signal processing circuits.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The PNP transistor can be set up in different \u201cconfigurations\u201d (common-emitter, common-base, common-collector), depending on the wanted amplification type.<\/span><\/li>\n<\/ul>\n<h2><strong>Application Circuits Examples<\/strong><\/h2>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><strong>LED Switching:<\/strong> Turning ON\/OFF an LED based on a signal.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><strong>Motor Control:<\/strong> Switching a DC motor using a small control signal.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><strong>Audio Amplification:<\/strong> Making weak microphone signals strong enough to power a speaker.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><strong>Voltage Regulators<\/strong>: Keeping output voltage steady in power supplies.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\"><strong>Oscillators<\/strong>: Creating repeating signals for timers and alarms.<\/span><\/li>\n<\/ol>\n<h2><strong>Advantages of PNP Transistors<\/strong><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Complements NPN transistors for full circuit designs (push-pull stages, H-bridges).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Often used when the positive voltage supply is the reference or the ground for the control circuit is not convenient.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Good for high-side switching.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Effective in circuits where the load must be connected to ground, and the switch connects to the positive supply.<\/span><\/li>\n<\/ul>\n<h2><strong>Disadvantages of PNP Transistors<\/strong><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Less commonly used than NPN transistors in some circuits (especially logic circuits).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Slightly more susceptible to temperature changes than NPN counterparts.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sometimes more limiting in switching speed due to \u201chole\u201d movement being slower than electron movement.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">May require different drive circuitry than NPN transistors when used in microprocessor-based designs.<\/span><\/li>\n<\/ul>\n<h2><strong>PNP Transistor in Everyday Life<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">You don\u2019t need to look far to find PNP transistors at work. Some real-world uses include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">In old radios and amplifiers, both NPN and PNP types are paired to create clearer sound.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Used in the power supply section of appliances to ensure stable voltage.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">As switches in home automation systems\u2014like automatic fans, alarm systems, and lighting.<\/span><\/li>\n<\/ul>\n<h2><strong>How to Identify a PNP Transistor?<\/strong><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check the part number (like BC558, 2N3906\u2014these are common PNP types).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Circuit symbol arrow points into the base.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If testing with a multimeter (diode test mode), you\u2019ll notice one pin (emitter) allows \u201ccurrent\u201d only when the positive probe is on the emitter and the negative probe is on the base\u2014the reverse of NPN.<\/span><\/li>\n<\/ul>\n<h2><strong>FAQs<\/strong><\/h2>\n<p><b>Q1: What are the three terminals of a PNP transistor?<\/b><b><br \/>\n<\/b> <b>A:<\/b><span style=\"font-weight: 400;\"> A PNP transistor has three terminals: the <\/span><b>Emitter<\/b><span style=\"font-weight: 400;\">, which emits holes; the <\/span><b>Base<\/b><span style=\"font-weight: 400;\">, which controls current; and the <\/span><b>Collector<\/b><span style=\"font-weight: 400;\">, which collects the charge carriers flowing through.<\/span><\/p>\n<p><b>Q2: In which direction does current flow in a PNP transistor?<\/b><b><br \/>\n<\/b> <b>A:<\/b><span style=\"font-weight: 400;\"> In a PNP transistor, current flows from the <\/span><b>Emitter to the Collector<\/b><span style=\"font-weight: 400;\">, as holes (positive charge carriers) move through the transistor when the Base is more negative.<\/span><\/p>\n<p><b>Q3: What is the typical use of a PNP transistor?<\/b><b><br \/>\n<\/b> <b>A:<\/b><span style=\"font-weight: 400;\"> PNP transistors are mainly used for <\/span><b>amplifying electrical signals<\/b><span style=\"font-weight: 400;\"> or as <\/span><b>electronic switches<\/b><span style=\"font-weight: 400;\">, turning devices ON or OFF in various analog and digital circuits, especially in negative power configurations.<\/span><\/p>\n<p><b>Q4: Which type provides the majority charge carriers in PNP?<\/b><b><br \/>\n<\/b> <b>A:<\/b><span style=\"font-weight: 400;\"> In a PNP transistor, <\/span><b>holes are the majority charge carriers<\/b><span style=\"font-weight: 400;\">, meaning they are responsible for current conduction, unlike electrons which dominate in NPN transistors.<\/span><\/p>\n<p><b>Q5: Are PNP transistors used in digital ICs?<\/b><b><br \/>\n<\/b> <b>A:<\/b><span style=\"font-weight: 400;\"> While <\/span><b>NPN transistors are more commonly used<\/b><span style=\"font-weight: 400;\">, PNP transistors are still important in <\/span><b>complementary logic and analog circuit designs<\/b><span style=\"font-weight: 400;\">, helping create push-pull amplifier stages or symmetrical responses.<\/span><\/p>\n<h2><strong>Conclusion<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">A PNP transistor is a small, but powerful, electronic device. When you understand how it works, you can build and repair many kinds of circuits, from amplifiers to switches and even parts of computers. By being able to control large currents with a tiny signal, the PNP transistor remains one of the pillars of modern electronics.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Whether you\u2019re just learning or designing advanced circuits, understanding the PNP transistor will form the foundation for more complex electronics knowledge in your future.<\/span><\/p>\n<h4>Also Read <\/h4>\n<p><a href=\"https:\/\/www.aakash.ac.in\/blog\/difference-between-npn-and-pnp-transistors\/\">Difference Between NPN and PNP Transistors<br \/>\n<\/a><br \/>\n<a href=\"https:\/\/www.aakash.ac.in\/blog\/what-is-pnp-transistor\/\">PNP Transistor<br \/>\n<\/a><br \/>\n<a href=\"https:\/\/www.aakash.ac.in\/blog\/npn-transistor-an-in-depth-guide\/\">NPN Transistor<\/a><br \/>\n<a href=\"https:\/\/www.aakash.ac.in\/blog\/what-is-a-transistor\/\">What is a Transistor<\/a><\/p>\n<p><a href=\"https:\/\/www.aakash.ac.in\/blog\/what-is-fet\/\">What is Fet?<br \/>\n<\/a><br \/>\n<a href=\"https:\/\/www.aakash.ac.in\/important-concepts\/physics\/bipolar-junction-transistor\">Bipolar Junction Transistor (BJT)<br \/>\n<\/a><br \/>\n<a href=\"https:\/\/www.aakash.ac.in\/important-concepts\/physics\/characteristics-of-transistor\">Characteristics of a Transistor<br \/>\n<\/a><br \/>\n<a href=\"https:\/\/www.aakash.ac.in\/important-concepts\/physics\/uses-of-transistors\">Uses of Transistors<br \/>\n<\/a><\/p>\n<h4>Also Read <\/h4>\n<p><a href=\"https:\/\/www.aakash.ac.in\/blog\/difference-between-npn-and-pnp-transistors\/\">Difference Between NPN and PNP Transistors<br \/>\n<\/a><br \/>\n<a href=\"https:\/\/www.aakash.ac.in\/blog\/what-is-pnp-transistor\/\">PNP Transistor<br \/>\n<\/a><br \/>\n<a href=\"https:\/\/www.aakash.ac.in\/blog\/npn-transistor-an-in-depth-guide\/\">NPN Transistor<\/a><br \/>\n<a href=\"https:\/\/www.aakash.ac.in\/blog\/what-is-a-transistor\/\">What is a Transistor<\/a><\/p>\n<p><a href=\"https:\/\/www.aakash.ac.in\/blog\/what-is-fet\/\">What is Fet?<br \/>\n<\/a><br \/>\n<a href=\"https:\/\/www.aakash.ac.in\/important-concepts\/physics\/bipolar-junction-transistor\">Bipolar Junction Transistor (BJT)<br \/>\n<\/a><br \/>\n<a href=\"https:\/\/www.aakash.ac.in\/important-concepts\/physics\/characteristics-of-transistor\">Characteristics of a Transistor<br \/>\n<\/a><br \/>\n<a href=\"https:\/\/www.aakash.ac.in\/important-concepts\/physics\/uses-of-transistors\">Uses of Transistors<br \/>\n<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you ever open a radio, amplifier, or many kinds of digital devices, you will see small black parts with three legs\u2014these are transistors. In the world of electronics, transistors are considered the heart of almost every electronic circuit.\u00a0 One important type is the PNP transistor. What does it do, how does it work, and [&hellip;]<\/p>\n","protected":false},"author":56,"featured_media":291988,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12962],"tags":[],"class_list":["post-291976","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-transistor"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is PNP Transistor\u200b? Definition, Working, Symbols and More<\/title>\n<meta name=\"description\" content=\"What is PNP Transistor\u200b? 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