Surface Mount Device Sizes

This booklet is a plain english introduction to surface mount nomenclature and packaging.

Surface mount device sizes. Each size is described as a 4 digits number. 2835 3528 3020 3030 3535 3014 4014 5050. Sot 223 small outline transistor. An electrical component mounted in this manner is referred to as a surface mount device smd in industry this approach has largely replaced the through hole technology construction method of fitting components in large part because smt allows.

It s also a great way to catch any pin pitch width and size mismatch between your footprint and the actual part. The first 2 digits indicate the length. Surface mount resistors size chart. Soon you will be speaking the language of surface mount.

Although surface mount these devices require specific process for assembly. Some packages have nothing at all in that case the device is shown such that the id code is the right way up. Further tape and reel specifications can be found in the electronic industries association eia standard 481. You can find surface mount resistors as large as 6 3mm x 3 1mm which is referred to as size 2512.

The footprint size of flat chips is identified by a 4 digit size code. When you have looked up a device the base letter will guide you to a pin out diagram. It s surprising how sizes all look the same in the cad program. Here s a view on common smds surface mount devices.

The last 2 indicate the width in 0 01 or 10 mils units. Smd resistors smd resistors come into several possible case sizes. Surface mount resistors come in a variety of sizes. Surface mount device smd tape and reel information.

Smd stands for surface mounted device smd led is a package type of led produced by using surface mount technology smt to mount led chips on printed circuit boards pcb. Chip on board cob a bare silicon chip that is usually an integrated circuit is supplied without a package which is usually a lead frame overmolded with epoxy and is attached often with epoxy directly to a circuit board. It is larger than the sot 23 and it measures 6 7 mm x 3 7 mm x 1 8 mm. The sot223 package is used for higher power devices like higher power surface mount transistors or other surface mount devices.

Note that some bases have marks to show the correct orientations on others one or more pins may be a different size or shape. Endgroup w5vo jan 24 13 at 5 18. The smallest size is the 0201 package which measures a tiny 0 6mm x 0 30mm. Surface mount technology smt is a method in which the electrical components are mounted directly onto the surface of a printed circuit board pcb.

Endgroup markrages jan 24 13 at 2 44 begingroup markrages absolutely i recommend the same. The table and diagram on this page indicate the tape sizes used for various package types and the basic orientation convention used.