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Transistor parameters transistor d1555 datasheet as Vceo, etc need to be datashheet. Normally it is not a problem to choose a replacement transistor with a higher gain.

The current gain of transistors is notoriously difficult to specify. Picking a replacement transistor When choosing a suitable replacement transistor for use within an electronic circuit, there are several stages that must be considered when making the choice.

It is necessary to make sure that the transistor d1555 datasheet transistor is able to operate at the required frequency.

Install the incorrect type and it experience the inverse of all the voltages it would expect and is likely to be destroyed. Select a transistor with a similar Hfe: It is necessary to ensure that the replacement transistor can handle the power that it will dissipate within the circuit.

When looking for a suitable transistor replacement some of the basic transistor parameters that need to be considered include the following:. In this way it is usually possible to find transistor d1555 datasheet suitable replacement transistor.

It is usually possible to estimate the frequency of operation. Don’t go for a transistor with a much higher Ft as this may increase the risk of oscillation.

If the original transistor is still working then this can be discovered by measuring the voltage across the base emitter junction when it is forward biased. Look at the specifications for other transistors in the same packages and this will give a transistor d1555 datasheet guide. Being able to choosing a replacement transistor can be very useful if the exact transistor trqnsistor is not available easily. These instructions are set out in an approximate order of the most significant parameters first followed by the less significant ones: Most transistors are either silicon or germanium.


When considering any possible replacement transistors, it is necessary to look at a transistor d1555 datasheet of parameters. These instructions are set out in an approximate order of the most significant parameters first followed by the less significant ones:.

D1555 Datasheet PDF

It is important to find out whether the transistor is silicon or germanium. Other devices may also appear in what may appear to be transistor packages at first sight. It is necessary to ensure that the current gain of the replacement transistor is about the transisto as the original. This is particularly true transistor d1555 datasheet specialised circuits datasheey some specific performance features may be critical.

Transistor d1555 datasheet is necessary to make sure that the transistor is able to withstand the voltages it is likely to see.

It is necessary to ensure that the transistor d1555 datasheet transistor can dissipate sufficient power. Look darasheet the components in the circuit and the function of the circuit.

Choosing Transistor Replacements | Electronics Notes

If this is not possible, either because the markings are not visible, or the data cannot be found, then not all is lost. It is normally important to ensure transistor d1555 datasheet the transistor can meet any frequency limits.

Select a replacement transistor of the same material: Choose a transistor with a similar power dissipation: Transistors are normally given an indication of their application in the datasheets. It is still possible to find out a lot about the transistor from its package and also the circuit in which it is being used. Choosing a replacement transistor is normally quite easy. Put in the correct type and it may not perform well. Most transistors will either be germanium or silicon.

In either case, it is useful to be able to choose the replacement transistor with a good possibility of it being able to work. It may be a field effect transistor, a Darlington transistor or even some other transistr of device. Often the package type is a good indication of this. Choose a replacement with the same package: Step by step instructions: This is not always true so beware! It is transistor d1555 datasheet to ensure that the replacement transistor will be able to operate at the relevant frequencies, so a similar or slightly higher Ft is advisable.


It is quite likely that transistor d1555 datasheet similar one may be available to hand, or possibly from a local stockist. Although most of the main points have been covered in the points above, it is always best to be on the look out for other parameters that may affect the choice of transistor replacement.

All these need to be taken dxtasheet account when choosing a suitable replacement transistor. The step by step instructions below should help trannsistor essential parameters of the transistor to be discovered. These are the main parameters that are of importance in most applications, transistor d1555 datasheet be on the look out for any other transistor parameters that may need to transistor d1555 datasheet included in the selection of the replacement transistor d1555 datasheet.

Check it can take the current: Although it is not always necessary to exactly match the intended purpose for the transistor, a variety of areas of its performance rransistor be tailored to its intended applications. It is often necessary to match the replacement transistor package as closely as possible to enable the transistor to physically fit. Ensure that the replacement transistor d1555 datasheet can pass the teansistor current – it dtaasheet transistor d1555 datasheet an I Cmax greater than or equal to the original daasheet.

Current gain values normally vary datasneet even for transistors of the same type so some variation will be acceptable. It tfansistor important to know what type the transistor is because there is a difference in the base emitter forward bias voltage transistot. Although they are slightly different, for all circuit equivalences of this nature these transistor parameters are the same.