SL100 & SK100 transistor

[alanng96]

I can't find SL100 & SK100 transistor :'(

Which transistors can replace these?

Thank you for your help~  ;)

[audioguru]

They are very old transistors in a metal TO-39 case.
The old datasheet I saw didn't even say which is NPN and which is PNP.

For low power I would use 2N4401 and 2N4403 transistors instead.
For higher power I would use TIP31 and TIP32 power transistors instead.

[hotwaterwizard]

Here are both Datasheets in one Document. They do tell which is which in these.

[phaedrus]

Hi Wizard,

It shows only SL100 and not SK100. Both components are SL100.One of your previous posts too shows only SL100 though you have mentioned as SK100.
Could you please post SK100 ?

Regards
Thos

[hotwaterwizard]

hey are the same accept one is PNP and one is NPN

[taiyeb]

hello, you can used ac127 NPN, AC128 PNP

[audioguru]

I used the old germanium AC127 and AC128 transistors in 1967 when I worked for Philips. That was 40 years ago.

[hotwaterwizard]

How old are you Audioguru?

[audioguru]

How old are you Audioguru?

I am an old geezer at 61 years young. I retired at 55 and I am having a great time bumming around. ;D

[hotwaterwizard]

Now I know why you are the way you are.
They call it Wisdom.

Do you know the difference between Knowledge and Wisdom?


Knowledge is knowing what to do.
You learn from school and books and you have Knowledge.

Wisdom is knowing what not to do with the Knowledge.
You learn (from the school of hard knocks) that certain things you are taught in school do not apply in real life. Therefore you have Wisdom.

[audioguru]

I borrow some wisdom from parts manufacturers. They have very good reasons for the max allowed ratings and min and max spec's on their datasheets.

In school I was taught about "typical" ratings but it was useless and obsolete knowledge. My experience gives me the wisdom to use min and max ratings for parts so all my circuits work, not just some of them.