Common Layouts
Connectors are categorized by pin spacing in mm (pitch), number of pins, and number of rows. Connectors commonly used in computers include:
- 3.5 in IDE desktop computer hard disc drives - 2.54 mm pitch, 40 pins, 2×20 (2 rows of 20 pins)
- 2.5 in IDE notebook computer hard disc drives - 2.00 mm pitch, 44 pins, 2×22 (2 rows of 22 pins)
- SCSI SE 8-bit - 2.54 mm pitch, 50 pins, 2×25 (2 rows of 25 pins)
- Floppy disk - 2.54 mm pitch, 34 pins, 2×17 (2 rows of 17 pins)
- Serial DE-9 on motherboards - 2.54 mm pitch, 10 pins, 2×5 (2 rows of 5 pins) - sometimes called everex
- Serial DB-25 on motherboards
- Parallel DB-25 - 2.54 mm pitch, 50 pins, 2×13 (2 rows of 13 pins)
Read more about this topic: Insulation-displacement Connector
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