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By continuing to use our site, you agree to our cookie policy. Actual circuit gain depends on other components. Motorola reserves the right to make trxnsistor without further notice to any products herein.

Current gain falls off at higher frequencies, so a high-gain transistor can deliver a wider frequency response than a low-gain transistor. Thanks for letting us know.

BC237 Datasheet, Equivalent, Cross Reference Search

Choose a substitute transistor with a breakdown voltage rating at least as high as the original. Low resistance readings on the base with the black negative – leads correspond to an N-type material in the base of a PNP transistor. Be sure to choose a substitute transistor with a maximum current rating at least as high as the original. The first spec to consider is the Transistor Outline.

V CB is always equal to or greater than V CE and you can use either of these maximum voltages to compare transistors. If more than a maximum voltage rating is applied to a transistor, it can be permanently damaged. You’ll find that fewer devices need to be stocked, and turnaround time can be reduced. Now you are helping others, just by visiting wikiHow.

How does it work?

You can test a transistor with a multimeter that has a diode test function. De-soldering and replacing a transistor takes very little time. The emitter-base PN junction has a slightly greater forward voltage drop than the collector-base PN junction, because of heavier doping of the emitter semiconductor layer. Help answer questions Learn more. If the display shows 2 different readings for the other 2 leads, clamp the red probe to another lead and repeat the test.

Thus, the transistor is a PNP with base on wire 3, emitter on wire 1 and collector on wire 2 as described in Figure below.

Move the red probe to the collector.

Maximum current is the maximum continuous collector current I C that a transistor can withstand without permanent damage. Include your email address to get a message when this question is answered.

The type number is often printed on the transistor, although product manufacturers sometimes have their own part numbers printed instead.

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.

Learn about the Overlap-Add Method: It’s a maximum current rating so choose a substitute with a rating at least as high as the original.

BC239C Datasheet PDF – KEC

This is the only spec you can actually see. V CB – the maximum voltage across the Collector-Base terminals V CE – the maximum voltage across the Collector-Emitter terminals V EB odf the maximum voltage across the Emitter-Base terminals In each of these ratings, the 3rd terminal is assumed to be electrically open unconnected.

If the previous readings were both low and the current readings are both high, the transistor is good. All downloqd shared under a Creative Commons License. It’s not a good idea to substitute a Darlington transistor for a non-Darlington type, or vice versa.


How can I tell the difference between a collector and an emitter? A Transistor Outline number, or TOrefers to a transistor’s physical size, bbc237, and mounting style. In that case, the product’s Service Manual or Parts List might provide you with the transistor type. How to reach us: You can organize the transistors into groups of drawers, each dedicated to a particular transistor outline. Current gain is only occasionally significant when choosing a substitute transistor. A junction transistor is a sandwich of “N” and “P” type semiconductors.

E and C high R: Heat sinks and fans increase the ability of a transistor to dissipate heat. Insert the probes into the multimeter.

Some TO numbers are shown here:.