zetom.info Tutorials Transistor Substitution Data Book


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Transistor Substitution Data Book

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Transistor Substitution Data Book datasheet, cross reference, circuit and application notes in pdf format. All Transistors Datasheet. Cross Reference Search. Transistor Database. How to choose a substitute transistor when an exact replacement isn't available. for substitution. You can find transistor specs in data sheets available online.

Picking a replacement transistor

The Power dissipation PD Watts — The substitution part should be able to dissipate as much or more power as the original one. The Gain hfe — The substitution should have a gain equal to or better than the original and it should be as close to the original parameter as possible.

The Gain-bandwidth ft — The substitution should have a transition frequency equal to or faster than the original and it should be as close to the original parameter as possible.

Above is a table of application requirement and important specification that you can use for guidelines when comes to transistor replacement. Remember, the replacement transistor should not run hot and if problem still present, try another substitution number or find the original part number if you can. Do not overlook that the surrounding components also may caused the transistor to run hot even if original number is used. For instance, in the case of repairing Monitor, the horizontal output transistor HOT always burnt in few hours to few days time, if you did not check the surrounding components such as the electrolytic capacitor connected to the supply pin of horizontal driver transformer.

Monitor Horizontal Driver Circuit. Copyright www.

Application Requirement. Important Specifications. General purpose low level amplifier and switching transistors. Sorry if I went over your head. With out knowing what and ware your are using it, you should choose a similar part.

Must be!

Maybe a volt part will work. I don't know. There are many parts in the mA to 1A range. The physical size is TO Glory be Thank you Ron.

James Halo New Member. April, I've provided information in a very old thread a few weeks ago about an online replacements database I found very useful. You can see my response here: Hope it helps!

Cheers, James. You must log in or register to reply here. Latest threads. All these need to be taken into account when choosing a suitable replacement transistor.

All Transistors. Datasheet. Cross Reference Search

Other types are normally only used in very specialist applications. It is important to know what type the transistor is because there is a difference in the base emitter forward bias voltage drop.

For germanium it is around 0. The circuit will be designed around a particular voltage drop.

Install the incorrect type and it experience the inverse of all the voltages it would expect and is likely to be destroyed. Possible application types may include: switching, analogue, low power, RF amplifier, low noise, etc.

Put in the correct type and it may not perform well. 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.

Cross reference

It is often necessary to match the replacement transistor package as closely as possible to enable the transistor to physically fit. Also the package may give an indication of other parameters.

Transistor parameters such as Vceo, etc need to be checked. Although they are slightly different, for all circuit equivalences of this nature these transistor parameters are the same. Choosing a replacement transistor with approximately the same current gain is necessary.

Normally it is not a problem to choose a replacement transistor with a higher gain. Often a lower current gain may be acceptable.

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It is normally important to ensure that the transistor can meet any frequency limits. Often the package type is a good indication of this. These are the main parameters that are of importance in most applications, but be on the look out for any other transistor parameters that may need to be included in the selection of the replacement transistor.

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.

These can be progressed in a logical order to narrow down the choice and enable the best alternative for the replacement transistor to be made. As bias voltages and other features are different it is necessary to select a replacement transistor with the same material.

The replacement should have the same application if possible.Supplementary data will be published at a later date. Koninklijke Philips Electronics N. This resistor is labeled RC throughout Chapter 4. It is usually possible to estimate the frequency of operation. Then, when you need to pick a substitute for an original transistor, you can quickly home in on all your potential candidates.

Either the "meat" has extra negative charge carriers electrons and the "bread" has extra positive charge carriers holes , or the meat has the positive charges and the bread has the negative charges. Ensuring with pin-out is the same most but not all transistors have their leads in order - EBC will save many problems with fitting.

Choose a replacement with the same package: