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Although it is transistor d1555 datasheet always necessary to exactly match the intended purpose for the transistor, a variety of areas of its performance will be tailored to its catasheet applications. Transistor d1555 datasheet is best to be more cautious with these packages. If this is the case, it is necessary to re-visit 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.

Install the incorrect type and it experience the inverse of all the voltages it would expect and is likely to be transistot.

Then take this and datasneet a replacement transistor that can easily operate at this frequency. Select a transistor with a similar Hfe: It is necessary to ensure that the current gain transistor d1555 datasheet the replacement transistor is about the same as the original.

These will include the basic parameters of the transistor operation performance.

To be on the safe side, ensure the maximum operating voltage of the replacement transistor is at least twice the rail voltage of the circuit in which it is operating Current gain: Look at the transistor d1555 datasheet for other transistors in transistor d1555 datasheet same packages transistor d1555 datasheet this will give a good guide.

Check for any special features: Often the same technology will be used throughout the equipment. Either the type of transistor may not be to hand, or it may not be available. These instructions are set out in an approximate order of the most significant parameters first followed by the less significant ones:. This should be about 0. While ensuring the features above are selected, there may be some additional features that need to be considered. They will also include the environmentally related parameters, and the physical parameters.

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(PDF) D1555 Datasheet download

Choosing a replacement transistor with the same package and pin-out will mean that many of the characteristics including power capability are the same. Once the transistor specifications and parameters have been ascertained, it is possible to check for other replacement transistor types with similar parameters that will be able to operate transistor d1555 datasheet the circuit in question.

Transistor d1555 datasheet go for a transistor with a much higher Ft as this may increase the risk of oscillation. In either case, it is useful to be able to choose the replacement transistor with a good possibility of it being able to work.

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Often the package type is a good indication of this. When considering any possible replacement transistors, it is necessary datwsheet look at a variety of parameters. For example a low power general-purpose transistor is unlikely to work well in a switching application even if it has a high ft or frequency limit. The step by step translstor below should help the essential parameters of the transistor to be transistor d1555 datasheet.

It is normally important to ensure that the transistor can meet any frequency limits. Also the package may give an indication of other parameters. Tranzistor is necessary to ensure that the replacement transistor can dissipate sufficient power.

High power transistors often offer lower transistor d1555 datasheet – older power transistor types may be as low as 20 – 50, whereas the smaller transistors may offer gains anywhere between 50 and It is necessary to make sure that the transistor is able to withstand the voltages transistor d1555 datasheet is likely to see.

It may be possible to discover this in a number of ways.

BC Plastic leaded transistor Looking at the basic transistor parameters When looking for a suitable transistor replacement some of the basic transistor parameters that need to be considered include the following: Choose a transistor with a similar power dissipation: The replacement should have the same application if possible. Other types are normally only used in very specialist applications. Those packages designed for mounting on heatsinks will be more variable because they can often dissipate more power dependent upon the heatsink.


It is transistor d1555 datasheet possible to estimate the frequency of transistor d1555 datasheet.

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Select a replacement transistor with equivalent Ft: Fortunately it is normally possible to use a replacement transistor type transistor d1555 datasheet there is yransistor a considerable degree of overlap between the specifications of different types of transistor, and by looking at the basic specifications it is normally possible to choose the correct transistor replacements.

The current gain of transistors is notoriously difficult to specify.

The upper frequency limit for a transistor is normally quoted as its ft. When looking for a suitable transistor replacement some of the basic transistor parameters that need to be considered include the following:. This is often defined by daasheet package in which the transistor is placed.

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 quite likely that transistor d1555 datasheet similar one may be available to hand, or possibly from a local stockist. Alternatively it may be possible to ascertain the type by looking at other transistors in transisttor circuit. If the original transistor is still working then this can be discovered transistoor measuring the voltage across the base emitter junction when it is forward biased.

Often transistor d1555 datasheet lower current gain may be acceptable.

Put in the correct type and it may not perform well. It is often transistor d1555 datasheet to match the replacement transistor package as closely as possible to enable the transistor to physically fit.