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Choosing a replacement transistor with the same package and pin-out will mean that many of the characteristics including power capability are the same. The current transistor d1555 datasheet of transistors is notoriously difficult to specify.

Transistors have many packages. The step by step instructions below should help the essential parameters of the transistor to be discovered. Picking a replacement transistor When choosing a suitable transistor d1555 datasheet transistor for use within an electronic circuit, there are several stages that must be considered transistor d1555 datasheet making the choice.

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 transistor d1555 datasheet made or look for other parameters that may affect transixtor operation of the transistor circuit. These can be progressed in a logical order to narrow down the choice and enable the best alternative for datadheet replacement transistor to be made.

This should be about 0. They will also include the environmentally related parameters, and the physical parameters. It is usually transistor d1555 datasheet to estimate the frequency of operation.

Then take this and choose a replacement transistor that can easily operate at this frequency. Choose a replacement with the same package: It is necessary to ensure that the replacement transistor can handle the power that it will dissipate within the circuit.

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As bias voltages and other transistor d1555 datasheet are different it is necessary to select a replacement transistor with the same material. Look at the components in the circuit and the function of the circuit. Once the choice of replacement transistor has been made, then it can be installed in the circuit, transistor d1555 datasheet the performance checked.

Most transistors are either datashest or germanium.

Often a lower current gain may be acceptable. It is often necessary to match the replacement transistor package as closely as possible to enable the transistor d1555 datasheet to physically fit. Although it is not always necessary to exactly match the intended purpose for the transistor, a variety of areas of its performance will transistor d1555 datasheet tailored to its intended applications. It is necessary to ensure that the replacement transistor will be able to operate at the relevant frequencies, so a similar or slightly higher Ft is advisable.

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.

Transistor parameters such as Vceo, etc need to be checked. Choose a transistor of the same polarity: When looking darasheet suitable transistor replacements it is necessary to look transistor d1555 datasheet the main specifications for the transistor. It is transistor d1555 datasheet to ensure that the replacement transistor can dissipate sufficient power. Ensure that the replacement transistor can pass the required current – it should have an I Cmax greater than or equal to the original transistor.

The circuit will be designed around a particular voltage drop. For germanium it is around 0. These will include the d11555 parameters of the transistor operation performance. 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 transistor d1555 datasheet include the following: It is necessary to make sure datssheet the transistor is able to datssheet the voltages it is likely to see.


Alternatively it may datazheet possible to ascertain the transistor d1555 datasheet by looking at other transistors datasehet the circuit. 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 Select a replacement transistor with the same breakdown voltage: Step by step instructions: Is it a transistor? Choosing a replacement transistor with approximately the same current gain is necessary.

Choosing a replacement transistor with a similar can style will often mean transistor d1555 datasheet both transistors have a similar power dissipation.

Choosing Transistor Replacements

These instructions are transistor d1555 datasheet out in an approximate order of the most significant parameters first followed by the less significant ones:. This explanation is focussed on bipolar transistors, but it is possible to apply similar logic to field effect transistors to ensure that suitable replacements can be found.

It is necessary to ensure that the current gain of the replacement transistor is about the same as the original. It is normally important to ensure that the transistor can meet any frequency limits.