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Short answer: No, they are not.
Medium answer: If you have an old stereo with a bad 2SD155, replacing the 2SD155 with an NTE175 will probably fix the unit; I'd say 90% chance of success.
Details: Both are NPN silicon power transistors in a TO-66 package. In most applications, the NTE175 has better characteristics.
The one value, collector current, is listed as 2 Amps for the NTE and 3 Amps for the 2SD, but the NTE critter also is specified for 5 Amps Peak collector current, specified at 5ms and less than 10% duty cycle. In an audio application, I think it'll do fine.
Good luck!
Wiki User
∙ 14y ago
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