Sansui Schematic Question

[electronhick]

Can someone tell me what the letters, sometimes numbers after a transistor part number are for?
Example 2SC711 (E, F, G). 2SC1124 (1,2) Thank you!

 

[sanjib]

Those numbers usually give the range of gains (hfe).

 

[electronhick]

What do the letters mean?

 

[goat67]

As previously posted these indicate the range of the gains (hfe) of the part. Same part number different gain Look at a datasheet.

 

[electronhick]

I did look at a data sheet for the 2SC1619A .The Sansui schematic shows 2SC1619A (R,O,Y).
I'm trying to understand what the (R,O,Y) means. Other transistors on the schematic have similar numbers and letters in parentheses after the part number. Thanks.

 

[DougBrewster]

For the particular transistor you mention - 2SC1619A - the data sheet I found in a quick look does not include gain groupings, only the overall gain range of the device, in this case 20-180. If you take a look at this datasheet https://www.semicon.sanken-ele.co.jp/sk_content/2sa1303_ds_en.pdf you will see under the electrical characteristics section the hfe rankings.

 

[electronhick]

Thank you for the clarification! Interesting that the OEM would allow such a wide range of hfe to be used.

 

[Hyperion]

Thank you for the clarification! Interesting that the OEM would allow such a wide range of hfe to be used.

It just means that in this case the design is 'forgiving' enough for this not to be critical, providing the device is within the letter parameters given.

 

[electronhick]

Thank you all for the comments!