Question: Can We Use NPN Transistor Instead Of PNP?

How do you know if a transistor is NPN or PNP?

Connect the positive lead of the multimeter to the Base (B) of the transistor and connect the negative lead to the Emitter (E) of the transistor.

If it is an NPN transistor then meter should show a voltage drop between 0.45V and 0.9V.

If it is a PNP transistor, then it should display see “OL” (Over Limit)..

What does PNP output mean?

A PNP output is commonly called a “sourcing” output. When it senses an object it will connect the output to the positive supply. If you’re unsure of which output type you need, a number of manufactures produce sensors with configurable outputs. In this case the sensor can be configured to operate as an NPN or PNP type.

What do NPN transistors do?

The NPN transistor is designed to pass electrons from the emitter to the collector (so conventional current flows from collector to emitter). The emitter “emits” electrons into the base, which controls the number of electrons the emitter emits. … The transistor is kind of like an electron valve.

How do transistors work?

By turning a small input current into a large output current, the transistor acts like an amplifier. But it also acts like a switch at the same time. When there is no current to the base, little or no current flows between the collector and the emitter. Turn on the base current and a big current flows.

Can I use any NPN transistor?

Would there be any issue in using any other NPN transistor? … So yes transistors are interchangeable, if the type (npn/pnp) and required specs match.

Is PNP normally open?

PNP – (PNP transistor) NO – normally opened, that means there is no voltage on the output while the sensor is not actuated (see picture, PNP sensor output connector is no. 4).

Is PNP or NPN more common?

PNP sensors tend to be more commonly used. Traditional relay type control circuit; Use with a programmable logic controller (PLC). … Less common nowadays are input cards that ‘source’, these were popular in Asia and require the NPN type of sensor in order to operate correctly.

What is the symbol of PNP transistor?

PNP vs NPN TransistorPNP TransistorNPN TransistorSymbolCollector-emitter voltageNegativePositiveEmitter arrowPointed inPointed out6 more rows•Mar 25, 2020

What is NPN or PNP transistor?

NPN and PNP refer to the arrangement of the pieces that make up the transister. The practical result is the direction of current flow. … An NPN transistor has a piece of P-type silicon (the base) sandwiched between two pieces of N-type (the collector and emitter). In a PNP transistor, the type of the layers are reversed.

How NPN sensor is used as PNP?

Put a pull-down resistor on your input. Attach your PNP prox to your input. Invert the logic in the PLC. You will need to calculate what size and wattage resistor to use to satisfy the input’s requirements.

What can replace a transistor?

Micro electrical mechanical (MEMS) relays might actually become a serious competitor to transistors. If you can make them small enough, they can switch pretty fast, certainly fast enough to replace the transistors in many applicaticons like low power MCUs where speed is not a priority.

Why we use NPN transistor instead of PNP?

A NPN transistor has electrons as majority charge carriers whereas the PNP transistor has holes as majority charge carrier. The mobility of electrons is better than mobility of holes. … mobility of electrons is more than hole,so as a result npn transistor are faster than pnp that’s why they are preferred..

What is the difference between PNP and NPN?

As they are normally referred, PNP and NPN sensors are both supplied with positive and negative power leads, then produce a signal to indicate an “on” state. PNP sensors produce a positive output to your industrial controls input, while NPN sensors produce a negative signal during an “on” state.

What is PNP wiring?

PNP = Switched Positive. NPN = Switched Negative. “Switched” refers to which side of the controlled load (relay, small indicator, PLC input) is being switched electrically. Either the load is connected to Negative and the Positive is switched (PNP), or the load is connected to Positive and the Negative is switched (NPN …

How do PNP transistors work?

The PNP transistor turns on when a small current flows through the base. The direction of current in PNP transistor is from the emitter to collector. … The base of the PNP transistor has always been negative with respect to the emitter and collector. In PNP transistor, the electrons are taken from the base terminal.

Which transistor is best?

Best Transistors: BJTs#1 NPN – 2N3904. You can find most often NPN Transistors in low-side switch circuits. … #2 PNP – 2N3906. For high-side switch circuits, you need a PNP style BJT. … #3 Power – TIP120. … #4 N-Channel (Logic Level) – FQP30N06L.Apr 21, 2014

What can we use instead of transistor?

The most obvious alternatives to transistors are vacuum tubes and electromechanical relays. In addition, magnetic amplifiers (magamps) are useful. Piezoelectric relays are rare. Rotating amplifiers, such as amplidyne motor-generator machines are useful at higher power levels.

What does NPN stand for?

The National Producer Number (NPN) is your unique identifier assigned through the National Association of Insurance Commissioner’s (NAIC’s) licensing application process. The NPN is used to track individuals and business entities on a national basis. You may use the link below to retrieve your NPN.

Where are NPN transistors used?

NPN Transistor ApplicationsNPN transistors are mainly used in switching applications.Used in amplifying circuit applications.Used in the Darlington pair circuits to amplify weak signals.NPN transistors are used in the applications where there is a need to sink a current.More items…•Jan 23, 2015

What is the full form of PNP transistor?

PNP stands for Positive, Negative, Positive. Also known as sourcing. On an IO Module, a PNP input, when undriven is pulled up to a high state e.g. +5V. NPN or PNP typicaly relates to digital signals.

When would you use a PNP transistor?

ApplicationsPNP transistors are used to source current, i.e. current flows out of the collector.PNP transistors are used as switches.These are used in the amplifying circuits.PNP transistors are used when we need to turnoff something by push a button. … Used in Darlington pair circuits.More items…•Apr 24, 2019