Choose a substitute transistor with a breakdown voltage rating at least as high as the original. Just make sure to compare apples with apples.
Actual circuit gain depends on other components. V CB – the maximum voltage across the Collector-Base terminals V CE – the maximum voltage across the Collector-Emitter terminals V EB – the maximum voltage across the Emitter-Base terminals In each of these ratings, the 3rd terminal is assumed to be electrically open unconnected.
In an enhancement type device, it’s an off-state current. Just use a bit of spaghetti tubing on the leads to keep them from touching each other.
They also have double the input voltage drop since there are two semiconductor junctions in series. P D is the overall power the FET can dissipate through heat.
This is the only spec you can actually see.
However, the transistor’s data sheet will show you that. You can use either of the above voltages when comparing FETs. Be sure to choose a substitute transistor with a maximum current rating at least as high as the original. One measure of gain, called h FEis often used for comparing transistors.
For tranwistor depletion-type FET, the gate-source bias voltage might be 0 V i. V CB is always equal to or greater than V CE and you can dataheet either of these maximum voltages to compare transistors.
dahasheet It’s the direct current that flows into the drain terminal when the gate to source voltage is zero. The first spec to consider is the Transistor Outline. BV GSS – the breakdown voltage between the Gate and the Source terminals when the drain is short-circuited to the source.
A junction transistor is a sandwich of “N” and “P” type semiconductors. If you don’t have that particular type, a transistor cross-reference guide can sometimes help you to find a compatible, generic part.
The V EB rating isn’t usually a factor in choosing a substitute transistor. One of the following breakdown voltages is usually included in the specifications for a FET:. If you install the wrong polarity, the sandwich won’t work.
Bipolar tranaistor transistors BJT s are the most common variety of transistor. But if the original transistor has a high gain, try to match it.
2SC Datasheet, PDF – Qdatasheet
One of the following breakdown voltages is usually included in the specifications for a FET: Heat sinks and fans increase the ability of a transistor to dissipate heat. A Transistor Outline number, or TOrefers to a transistor’s physical size, shape, and mounting style. Knowing how to substitute an dataxheet transistor type can speed up your repair, or make an otherwise impossible repair possible. Data sheets often specify a minimum or typical value of h FEor else a range of values that applies at a certain collector current I C.
At the maximum voltage, also called a breakdown voltage BVelectrons begin to avalanche in the transistor. BV DSS – the breakdown voltage between the Drain 2sf9014 the Source terminals when the gate is short-circuited to the source. The original transistor might need special ordering, or be discontinued and unavailable. There are three breakdown voltages: Field-effect transistors come in three basic types: Maximum Power, called P Dis the overall power a transistor can dissipate, through heat, without burning up.
You can find transistor specs in data sheets available online. The transistor outline doesn’t usually tell you which of the three transistor leads connects to its Base terminal Bits Emitter terminal Eor its Collector terminal C.
Some TO numbers are shown here:. You can organize the transistors into groups of drawers, each dedicated to a particular transistor outline. More time is spent figuring out which one to replace and, sometimes, what to replace it with! The type number is often printed on the transistor, although product manufacturers sometimes have their own part numbers printed instead.
But you might already have a suitable substitute in your parts drawers.
2SC9014 PDF Datasheet ( 特性, スペック, ピン接続図 )
Then, when you need to pick a substitute for an original transistor, you can quickly home in on all your potential candidates. This rating is used primarily with JFETs. Either the “meat” has extra negative charge carriers electrons and the “bread” has extra positive charge carriers holesor the meat has the positive charges and the bread has the negative charges. Maximum current is the maximum continuous collector current I C that a transistor can withstand without permanent damage.
Some TO numbers are shown here: Current gain falls off at higher frequencies, so a high-gain transistor can deliver a wider frequency response than a low-gain transistor.
This is the same spec used for bipolar transistors. Each of the three types listed above can be fabricated with either an N or a P conduction channel. De-soldering and replacing a transistor takes very little time.
In that case, the product’s Service Manual or Parts List might provide you with the transistor type.