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At the maximum voltage, also called a breakdown voltage BVelectrons begin to avalanche in the transistor. You’ll find that fewer devices need to be stocked, and turnaround time can be reduced. Some TO numbers are shown here: For a depletion-type Ttransistor, the gate-source bias voltage might be 0 V i.
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One measure of gain, called h FEis often used for comparing transistors. Knowing how to substitute an alternate transistor type can speed up your repair, or make an otherwise impossible repair possible. In each of these ratings, the 3rd terminal is assumed to be electrically open unconnected. Be sure to choose a substitute transistor with a maximum current rating at least as high as the original.
The V EB rating isn’t usually a factor in choosing a substitute transistor.
In a depletion type device, I DSS is an on-state current. Current gain is only occasionally significant when choosing a substitute transistor. Either the “meat” has extra negative charge carriers electrons and the “bread” has extra positive charge carriers holesor the meat has the transistod charges and the bread has the negative charges.
More time is spent figuring out which one to replace and, sometimes, what to replace it with!
Datasheet, Equivalent, Cross Reference Search. Transistor Catalog
Just use a bit of spaghetti tubing on the leads to keep them from touching each other. Choose a substitute with a rating at least as high as the original. The original transistor might need special ordering, or be discontinued and unavailable. Maximum current is the maximum continuous collector current I C that a transistor tdansistor withstand without permanent damage.
Actual circuit gain depends on other components. But you might already have a suitable substitute in your parts drawers. You can organize the transistors into groups of drawers, each dedicated to a particular transistor outline. Minimum and maximum values are usually given.
One of the following breakdown voltages is usually included in the specifications for a FET: Select a substitute with the same general range of values. A junction transistor is a sandwich catasheet “N” and “P” type semiconductors. If the lead arrangement of a small replacement transistor differs from that of the the original, you can sometimes bend the transistor leads across one another to route them into the correct holes in the circuit board.
During an avalanche, electrons in the P-N transition regions are accelerated to energies so high that they hit bound electrons with enough force to free them, creating additional charge carriers and greatly multiplying the transistor current. In that case, the product’s Service Manual or Parts List might provide you with the transistor type.
Heat sinks and fans increase the ability of a transistor to dissipate heat. BV DSS – the breakdown voltage between the Drain and the Source terminals when the gate is short-circuited to the source.
If you install the wrong polarity, the sandwich won’t work.
2SC Datasheet(PDF) – List of Unclassifed Manufacturers
Choose a substitute transistor with a maximum power rating datazheet least as high as the original. De-soldering and replacing a transistor takes very little time.
This is the same spec used for bipolar transistors.
Pick a substitute FET with a rating at least as high as the original. However, the transistor’s data sheet will show you that. The first spec to consider is the Transistor Outline. In an enhancement type device, it’s an off-state current.
2SC9014 PDF Datasheet ( 特性, スペック, ピン接続図 )
datashest It’s a datasneet current rating so choose a substitute with a rating at least as high as the original. There are three breakdown voltages: It’s not a good idea to substitute a Darlington transistor for a non-Darlington type, or vice versa. This is the only spec you can actually see. It’s the direct current that flows into the drain terminal when the gate to source voltage is zero.
The following electrical specs are important when choosing a substitute BJT. You can find transistor specs in data sheets available online. Maximum Power, called P Dis the overall power a transistor can dissipate, through heat, without burning up.