Please note that JavaScript and style sheet are used in this website,
Due to unadaptability of the style sheet with the browser used in your computer, pages may not look as original.
Even in such a case, however, the contents can be used safely.
CHAPTER 2 PRINTED WIRING BOARD DESIGN
2.3 THDs
2.3.4 Diameter of SDIP through hole
| The pin hole diameter of an SDIP can be calculated using a similar formula to that used for a DIP. Calculation example for an SDIP 0.50 ± 0.10 with a pin pitch of 1.778 mm |
| The allowable existence area of pin width direction = 2 x [b MAX./2 + x/2] = 2 x [0.60/2 + 0.17/2] = 2 x [0.77/2] = 0.77 mm |
| The radius of the hole on the printed wiring board, taking the pin thickness direction into consideration, is as follows. |
 |
Therefore, the hole diameter is  = 2 x r = 2 x 0.423 = 0.846 mm. |
| Generally, SDIPs also have tapered pin tips (taper ratio: 0.2/0.5), so the pin is inserted into a hole 0.8mm MIN. |
  |
© 1995-2008 NEC Electronics Corporation
