How do I choose a replacement transistor?

How do I choose a replacement transistor?

Choose a substitute transistor with a maximum power rating at least as high as the original. Current gain is only occasionally significant when choosing a substitute transistor. Actual circuit gain depends on other components. But if the original transistor has a high gain, try to match it.

How do you match transistors?

A common method of matching transistors is to use a fancy active current source to drive a stable current through the devices one at a time and to record the individual Vbe values. Then matched devices are selected based on the recorded values.

How interchangeable are transistors?

Others are set up for a particular application even though they are all part of the same family of components (capacitors, resistors, inductors, transistors, diodes). So yes transistors are interchangeable, if the type (npn/pnp) and required specs match.

How do I choose a replacement for a bipolar transistor?

Choosing a replacement BJT with approximately the same current gain is necessary.

1. Frequency. It is usually important to ensure that the replacement BJT can meet any frequency limits or requirements in your device, so it will not affect the function of original application.
2. Power dissipation.

Does it matter what transistor i use?

For most general purpose transistor applications we need devices which are non-conducting with zero bias on the control input (base or gate). Such devices are BJTs or enhancement mode MOSFETs. But do we need a BJT or a MOSFET? In many cases it does not matter.

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.

How do you use a multimeter to match a transistor?

Because the transistor base terminals are connected together, the measurement is the difference in VBE of Q1 and Q2. If the multimeter reads 0 V, we know the transistors are matched!

What does it mean when two transistors are matched?

Matched means the transistors were selected from a pile by measuring them to find the two that “match” closest for a particular variable, presumably the one you care about.

How do I know if my electronic component is replacing?

1. Spread some of the electronic devices on a piece of paper on your table or desk.
2. With the naked eye observe the appearance and shape of the devices.
3. Examine each device with a hand lens magnifier.
4. Use a microscope or stereoscope to look for details, especially on the transparent.

How do I know if my transistor is blown?

Connect the red probe in turn to each of the three leads. If the other two leads don’t give the same reading when touched by the black probe, the transistor is PNP and it is bad. Multimeter tests determine if a transistor is blown (open or shorted) and provide a rough estimate of the transistor’s ability to amplify.

Which type of transistor is most commonly used?

The MOSFET is by far the most widely used transistor for both digital circuits as well as analog circuits, accounting for 99.9% of all transistors in the world. The bipolar junction transistor (BJT) was previously the most commonly used transistor during the 1950s to 1960s.

Which is the most commonly used transistor?

Common emitter
Common emitter is the most commonly used transistor arrangement. Q3. The potential difference across the collector is a transistor, used in common emitter mode is 1.5V, with the collector resistance of 3kΩ.