Why transistor "A" suffix

[javajunkie]

For example what is the difference between NEC D588 and D588A? And B618 and B618A? The only difference I can see is Ucb, on these datasheets of unknown reliability:

http://www.semicon-data.com/transistor/tc/d0/D588A.html

Thanks

 

[Alan0354]

I think they meant Vce that is maximum collector to emitter voltage. There is a 10V difference. Not just this, other transistors are like that also. eg 2SC4886 and 4886A is 150V vs 180V.

 

[old.nerd]

Manufacturers will append a suffix (A, B, etc) on the part number to denote a change in specifications. If the new part has a higher spec than the old, it should be a drop-in replacement.

 

[javajunkie]

OK thanks fellas. So an increase in spec could potentially allow for better sound reproduction, or just make it tougher? Or both?

 

[ghazzer]

It often denotes the range of hFE (gain), so you need to read the datasheets to know the difference(s). If a 2SC1234Z has a gain of 500 and you replace it with a 2SC1234Y with a gain of 100, things will probably be different.

 

[javajunkie]

Thanks!