Why do DIP ICs come with the leads spaced slightly too wide?

Question

To insert an IC with a standard DIP package into a standard DIP socket, you always have to bend the leads in a millimeter or two. Why don't they come with the proper spacing?

Answer 1

Because they are intended for machine insertion. When you insert them by hand, you have to mimic the pressure used by the machines as the IC's are inserted.

Answer 2

The leads are supposed to be compressed before insertion. Automatic insertion machines do this, but there are also small hand tools that will hold the IC and compress the pins to the right spacing. After insertion, the pins try to spread out again, jamming the IC into the circuit board or socket. You can then handle the board, even turning it upside down, and the IC will not fall out. So that is the reason: to secure inserted ICs in their board hole or socket.

Answer 3

I always thought it was to help keep them in their sockets as they passed through the solder wave bath.

Answer 4

To conform to a wide range of chipsets