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Although most of the main points have been covered in the points above, it is always best to transistor d1555 datasheet on the look out for other parameters that may affect the choice of transistor replacement.

In this way it is usually possible to find a suitable replacement transistor. Sometimes it is very easy to find out the parameters of a particular transistor as it may be possible to find them on the Internet or in a transistor data book. Put in the correct type and it may not perform well. Choosing a transistor d1555 datasheet transistor with transistor d1555 datasheet same package and pin-out will mean that many of the characteristics including power capability are the same.

Transistor parameters such as Vceo, etc need to be checked. Is it a transistor? 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.

Alternatively it may be possible to ascertain the type by looking at other transistors in the circuit. Often the package type is a good indication of this. Don’t go for a transistor with a much higher Ft as this may increase the risk of oscillation. Most transistors are either silicon or germanium. Those packages designed transistor d1555 datasheet mounting on heatsinks will be more variable r1555 they can often dissipate more power dependent upon the heatsink.


This explanation is focussed transistor d1555 datasheet bipolar transistors, but it is possible to apply similar logic to field effect transistors to ensure that suitable replacements can be found.

This may appear to be an obvious question, but occasionally some devices may appear to be a transistor at first sight. Current gain values normally datasheeh widely even for transistor d1555 datasheet of the same type so some variation will be acceptable.

This is particularly true for specialised circuits where some specific performance features may be critical. Although it is not always necessary to exactly match the intended purpose for the transistor, a variety of areas of its performance will be tailored to its intended applications. Tranxistor looking for suitable transistor replacements it is necessary to transistor d1555 datasheet at the main specifications for the transistor.

Choosing Transistor Replacements

High power transistors often offer lower gains – older power transistor types may be as low as 20 – 50, whereas the smaller transistors may offer gains anywhere between 50 and Transistors have many packages.

Also the package may give an indication of other parameters. When considering any possible replacement transistors, it is necessary to look at a variety of parameters. The current gain of transistors is notoriously difficult to specify.

It may be possible to discover this in a number of ways. Select a replacement transistor with equivalent Ft: Choose a replacement with the same package: To be on the safe side, ensure the maximum operating voltage of the replacement transistor is at transistor d1555 datasheet twice the transistor d1555 datasheet voltage of the circuit in which it is operating Current gain: These instructions are set transistor d1555 datasheet in an approximate order of the most significant parameters first followed by the less significant ones:.


The circuit will be designed around a particular voltage drop.

All these need to be taken into account when choosing a suitable replacement transistor. If this is the case, it is necessary to transistor d1555 datasheet the way in which the choice of the replacement transistor was made and see if any mistakes were made or look for other parameters that may affect the operation of the transistor circuit.

Transistor d1555 datasheet at the specifications for other transistors in the same packages and this will give a good guide.

Choosing Transistor Replacements | Electronics Notes

When looking for a suitable transistor replacement some of the basic transistor parameters that need to be considered include the following:. Select a replacement transistor of the same material: Although they transistor d1555 datasheet slightly different, for all circuit equivalences of this nature these transistor parameters are the same.

These are normally required when transistors are used in transistor d1555 datasheet applications. 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 ensure that the replacement transistor can dissipate sufficient power.

It is important to find out whether the transistor is silicon datahseet germanium. It may be a field effect transistor, a Darlington transistor or even some other form of device. The replacement should transistor d1555 datasheet the same transistor d1555 datasheet if possible. Normally it is not a problem to choose a replacement transistor with a higher gain.

Other types are normally only used in very specialist applications. Most transistors will either be germanium or silicon.