SPDIP - Shrink Plastic Dual-in-Line Package

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The Shrink Plastic Dual In-line Package, or SPDIP, is a rectangular plastic package with leads extending from both of its long sides, thus forming two sets of in-line pins. The SPDIP is actually just a 'shrink' version of the PDIP. As such, the SPDIP provides a smaller package size compared to a standard PDIP for the same lead count.

The SPDIP comes in several body widths, i.e., 300 mils, 400 mils, 600 mils and 750 mils. Most SPDIP IC's have lead counts that range from 28 to 64. The SPDIP is a through-hole package, which means that its leads protrude to the other side of the circuit board once mounted. The standard lead pitch of the SPDIP is 70 mils.

Table 1. Properties of Some Examples of SPDIP's

Lead Count	Width	Length	Thickness	Pitch
8	300 mils	450 mils	155 mils	100 mils
22	300 mils	1030 mils	130 mils	100 mils
30	400 mils	1095 mils	150 mils	70 mils
42	600 mils	1450 mils	150 mils	70 mils
52	600 mils	1810 mils	150 mils	70 mils
64	750 mils	2273 mils	150 mils	70 mils

Figure 1. Example of an SPDIP: 28 leads in a 300-mil body

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