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Old 13th February 2006, 10:52 PM   #1
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Default Tip 142

Has anybody used the TIP 142's integrated diode? It has a diode that can be forward biased when a + voltage is applied to the emitter in respect to the collector. Could you not take one of these and place it on the heatsink to to act as a thermal compensator for the bias voltage?
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Old 13th February 2006, 11:04 PM   #2
lineup is offline lineup  Sweden
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TIP142 ha got one backwards connected diode across C-E.
It is for protect for backwards currents.

This means you should connect one TIP142 the opposite direction
to use this diode, and this TIP142 would not be of any use as a transistor.

Much better to use some other smaller transistor (or diode) for temp compensation.
Can be in TO-126 ot TO-220 case.
I can not see any benefits using diode in TIP142 for this.
Eventhough it is not impossible to do this.
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Old 13th February 2006, 11:12 PM   #3
AJT is offline AJT  Philippines
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hi,

if you have no other choice, you can do that, but just like lineup says, i say you waste a good transistor.
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Old 14th February 2006, 03:06 AM   #4
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You guys think that its possible, like the diode in a ThermalTrak transistor? Its just that its a waste of a transistor when you can do it with other ways?
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Old 14th February 2006, 04:19 AM   #5
AJT is offline AJT  Philippines
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Quote:
Originally posted by davidallancole
You guys think that its possible, like the diode in a ThermalTrak transistor? Its just that its a waste of a transistor when you can do it with other ways?

ThermalTrak is not the same as a TIP142, the diode is integral and internally connected to the collector emitter, unlike in the therlmaltrack where it is uniquely separate.
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Old 14th February 2006, 05:26 AM   #6
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Quote:
Originally posted by davidallancole
You guys think that its possible, like the diode in a ThermalTrak transistor? Its just that its a waste of a transistor when you can do it with other ways?

Perhaps, a Vbe multiplier could be applied? Since you plan on using a transistor anyway, this would be a better application of it and still use it as a transistor.
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Old 14th February 2006, 07:34 AM   #7
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