I have an ECG 4516B, made by Philips. I have thus far been unable to find any information about that specific component, but have found lots of information about other 4516Bs. So I guess I have two questions here.

Does the prefix matter when looking for an IC, or are the 4516Bs all the same on the inside?

And...

Can anyone tell me where to find a datasheet for this particular device?

Thanks.