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they are obsolete now 2016 and no availability. What now? I keep getting the same answers from the electronics forums because they "know it all !"
A simple google search for tip31 and looking at shopping will give you several places that still carry them. Ebay is one source. China still sells it all. There are also sights that will help you find suitable replacements. Google tip31 replacements for that. Just be sure to go over the data sheets. Compare the specs and make sure any recommended replacement has similar specs and the specs are within the needs of your circuit. See the exert from the data sheet attached.
TIP31C is Equivalent to: 2N6122, TIP31B, MJE340K, SW4F013
2SD313 is available in market everywhere. And it is eqvivalent to yours.
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Posted:Oct 26, 2012
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