Introduction of packaging methods for electronic components?

Dip in-line package-Dip in-line package. In one package, pins are led out from both sides of the package, and the packaging materials are plastic and ceramics. DIP is the most popular plug-in package, and its application scope includes standard logic ic, memory LSI, microcomputer circuit and so on.

PLCC-plastic led chip carrier-PLCC packaging mode, square shape, 32-pin package, pins all around, the overall size is much smaller than DIP package. PLCC packaging is suitable for SMT surface mount technology to install wiring on PCB, which has the advantages of small overall size and high reliability.

PQFP-plastic square flat package-PQFP package has very small pin spacing and thin pins. Generally, large-scale or very large-scale integrated circuits adopt this packaging form, and the number of pins is generally above 100.

SOP- Small Profile Package-1968 ~ 1969, Philips Company developed the Small Profile Package (SOP). Later, SOJ(J-pin small outline package), TSOP (thin small outline package), VSOP (ultra-small package), SSOP (thin micro SOP), TSSOP (thin micro SOP), SOT (small outline transistor) and SOIC (small outline integrated circuit) were gradually derived.

Common packaging materials are: plastic, ceramics, glass, metal, etc. Now it is basically packed in plastic.

According to the packaging form, it can be divided into: ordinary dual in-line type, ordinary single in-line type, small double-line flat type, small four-line flat type, round metal, large thick film circuit and so on.

According to the package size, the largest is thick film circuit, followed by dual in-line and single in-line respectively, and the smallest is metal package, dual flat and four-column flat.

The spacing between the two pins can be divided into: ordinary standard plastic package, double-row and single-row in-line type is generally 2.54±0.25mm, followed by 2mm (single-row in-line type is more common),/kloc-0 1.778±0.25mm (contracted double-row in-line type is more common),/kloc-0 1.5±0.25mm, or/kloc-.

Generally, the width between the two rows of needles in the dual-insert type is 7.4 ~ 7.62 mm, 10. 16mm, 12.7mm, 15.24mm, etc.

Width between two columns of double-row flat package (including lead length: generally 6 ~ 6.5 mm, 7.6mm, 10.5 ~ 10.65 mm, etc.). ).

Generally, the length× width of a four-column flat package with more than 40 pins is10x10mm (excluding lead length),13.6x13.6 0.4mm (including lead length) and 20.6×20.6±0.4mm.