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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 transistor d1555 datasheet a transistor data book.

Careful examination of the application will enable this to be verified. These instructions are set out in transistor d1555 datasheet approximate order of the most significant parameters first followed by the less significant ones: Normally it is not a problem to choose a replacement transistor with a higher gain.

In this way it is usually possible to find a suitable replacement transistor. Look at the components in the circuit and the function of the circuit.

2SD1555 Datasheet, Equivalent, Cross Reference Search

Choosing a replacement transistor with approximately the same current gain is necessary. Transistor d1555 datasheet bias voltages and other features are different it is necessary to select a replacement transistor with the same material.

Choose a replacement with the same package: Choosing a replacement transistor with the same package and pin-out will mean that many of the characteristics including power capability are the same. This may appear transstor be an obvious question, but occasionally some devices may appear to be a transistor at first sight.


Then take this and choose a replacement transistor that can easily operate at this frequency. Select a replacement transistor transistot the same material: The circuit will be designed around a particular voltage drop. These will include the basic parameters of the transistor operation performance. Install the incorrect type and it experience the inverse of all the voltages it would expect and is likely to datashheet transistor d1555 datasheet.

Don’t transistor d1555 datasheet for a transistor with a much higher Ft as this may datasheey the risk of oscillation. Although they are slightly different, transistor d1555 datasheet all circuit equivalences of this nature these transistor parameters are the same.

For germanium it is around 0. Choosing a replacement transistor with a similar can style will often mean that both transistors have a similar power dissipation. Current gain values normally vary widely even for transistors of the same transistor d1555 datasheet so some variation will be acceptable. In either case, it is useful to be able to choose the replacement transistor with a good possibility of it being able to work.

D Datasheet PDF – 3DD Case-Rated Bipolar Transistor

Choose trsnsistor transistor of the same polarity: Although transistor d1555 datasheet 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. It is necessary to ensure that the replacement transistor can handle the power that it will dissipate within the circuit.

It is normally important to ensure that the transistor can meet transistor d1555 datasheet frequency limits.

It is best to be more cautious with r1555 packages. Possible application types may include: These instructions are set out in an approximate order of the most significant parameters first followed by the less significant ones:.


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This is not always true so beware! Put in the correct type and it may not perform well.

The upper frequency limit for a transistor is normally quoted as its ft. Often the same technology will be used throughout the equipment.

If this is not possible, either because the markings are not visible, or the data cannot be found, then not all is lost.

Transistors are normally given an indication of their application in the datasheets. Transistor d1555 datasheet parameters such as Vceo, etc need to be checked.

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

Fortunately it is transistor d1555 datasheet possible to use a replacement transistor type as there is often 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. Once the transistor specifications and parameters have been ascertained, it is transistor d1555 datasheet to check for other replacement transistor types with similar parameters that will be able to operate within the circuit in question.

It is usually possible to estimate the frequency of operation.